THERMO ELECTRON CORP
8-K, 1998-10-30
MEASURING & CONTROLLING DEVICES, NEC
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION



                            Washington, D.C.  20549



                  ___________________________________________



                                   FORM 8-K



                                CURRENT REPORT

                      Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934



                                 Date of Report
                       (Date of earliest event reported):



                               October 29, 1998



                   ________________________________________



                          THERMO ELECTRON CORPORATION
             (Exact name of Registrant as specified in its charter)


   Delaware                         1-8002                      04-2209186
 
(State or other                  (Commission                (I.R.S. Employer
jurisdiction of                  File Number)            Identification Number)
incorporation or
  organization)


81 Wyman Street
Waltham, Massachusetts                                        02454-9046
(Address of principal executive offices)                      (Zip Code)



                                (781) 622-1000
                        (Registrant's telephone number
                             including area code)
<PAGE>
 
Item 5.  Other Events
         ------------
  On October 26, 1998, Thermo Electron Corporation (the "Company") executed an
Underwriting Agreement and related Terms Agreement by and among the Company,
Lehman Brothers Inc. and Salomon Brothers Inc in connection with the public
offering of $150,000,000 aggregate principal amount of its 7.625% Notes due 2008
(the "Notes") pursuant to the Company's shelf registration statement on Form S-3
(Reg. No. 333-62957). The Notes will be issued pursuant to an Indenture (the
"Indenture") by and between the Company and Bankers Trust Company, as trustee.

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits
         ------------------------------------------------------------------

(a)  Financial Statements of Business Acquired: not applicable.

(b)  Pro Forma Financial Information: not applicable.

(c)  Exhibits

     1.1  Underwriting Agreement and related Terms Agreement, dated October 26,
1998, by and among the Company, Lehman Brothers Inc. and Salomon Brothers Inc .

     4.1  Indenture, dated as of October 29, 1998, by and between the Company
and Bankers Trust Company.

     4.2  First Supplemental Indenture, dated as of October 29, 1998, by and
between the Company and Bankers Trust Company.

     4.3  Officers' Certificate dated October 29, 1998, pursuant to Section 301
of the Indenture, which includes the Form of Global Registered Note and the Form
of Definitive Registered Note.

     4.4  Form of Global Registered Note (included as Exhibit A to the Officers'
Certificate).

     4.5  Form of Definitive Registered Note (included as Exhibit B to the 
Officers'Certificate).


<PAGE>
 
                                  SIGNATURES



     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized, on this 29th day of October, 1998.



                                      THERMO ELECTRON CORPORATION



                                      By: /s/ Kenneth J. Apicerno
                                          _____________________________
                                          Kenneth J. Apicerno
                                          Treasurer


<PAGE>
 
EXHIBIT INDEX


Exhibit No.       Description


    1.1           Underwriting Agreement and related Terms Agreement, dated
                  October 26, 1998, by and among the Company, Lehman 
                  Brothers Inc. and Salomon Brothers Inc .

    4.1           Indenture, dated as of October 29, 1998, by and between 
                  the Company and Bankers Trust Company.

    4.2           First Supplemental Indenture, dated as of October 29, 1998, 
                  by and between the Company and Bankers Trust Company.

    4.3           Officers' Certificate dated October 29, 1998, pursuant to
                  Section 301 of the Indenture, which includes the Form of
                  Global Registered Note and the Form of Definitive Registered
                  Note.

    4.4           Form of Global Registered Note (included as Exhibit A to the 
                  Officers' Certificate).

    4.5           Form of Definitive Registered Note (included as Exhibit B to
                  the Officers' Certificate).


<PAGE>
 
                                                                     EXHIBIT 1.1


                                  $696,328,125

                          THERMO ELECTRON CORPORATION

                             UNDERWRITING AGREEMENT
                             ----------------------


                               October 26, 1998

Lehman Brothers Inc.
Three World Financial Center
New York, New York  10285

Salomon Brothers Inc
388 Greenwich Street
New York, New York 10013

Ladies and Gentlemen:

          Thermo Electron Corporation, a Delaware corporation (the "Company"),
                                                                    -------   
proposes to issue and sell up to $696,328,125 of a combination of the Company's
(i) debt securities, consisting of debentures, notes or other unsecured
evidences of indebtedness (which may be either senior debt securities (the
"Senior Debt Securities") or subordinated debt securities (the "Subordinated
Debt Securities"), and (ii) shares of common stock, $1.00 par value (the "Common
                                                                          ------
Stock"), in one or more offerings on terms and conditions determined at the time
- ------                                                                          
of sale.  The Debt Securities and the Common Stock are sometimes referred to
herein as the "Offered Securities."  The Senior Debt Securities will be issued
               ------------------                                             
pursuant to an indenture (the "Senior Indenture") between the Company and
                               ----------------                          
Bankers Trust Company, as trustee (the "Trustee") and the Subordinated Debt
                                        -------                            
Securities will be issued pursuant to an indenture (the "Subordinated
                                                         ------------
Indenture") between the Company and the Trustee (the Senior Indenture and
- ---------
Subordinated Indenture are sometimes hereinafter collectively referred to as the
"Indentures" and individually as an "Indenture").
 ----------                          ---------   

          From time to time, the Company may enter into one or more terms
agreements in substantially the form attached hereto as Schedule I (each a
"Terms Agreement") that provide for the sale of such designated Offered
- ----------------                                                       
Securities to, and the purchase and offering thereof by, either or both of you,
as applicable, and the underwriter or underwriters named therein (the
"Underwriters" or "you", which terms shall include the underwriter or
- -------------      ---                                               
underwriters named therein whether acting alone in the sale of Offered
Securities or as members of an underwriting syndicate), and the provisions set
forth herein (except for provisions which relate to securities other than
Offered Securities designated in the applicable Terms Agreement) shall be
incorporated by reference in any such Terms Agreement.  The applicable Terms
Agreement, including the provisions incorporated therein by reference, is herein
referred to as "this Agreement."
                --------------  
<PAGE>
 
                                      -2-



          1.   Representations, Warranties and Agreements of the Company. The
               ----------------------------------------------------------    
Company represents, warrants and agrees with each Underwriter as follows:

          (a) A registration statement on Form S-3 (No. 333-62957), including a
prospectus relating to the Offered Securities of the Company for the
registration of such securities under the United States Securities Act of 1933,
as amended (the "Securities Act"), has (i) been prepared by the Company in
                 --------------                                           
material conformity with the requirements of the Securities Act and the rules
and regulations (the "Rules and Regulations") of the United States Securities
                      ---------------------                                  
and Exchange Commission (the "Commission") thereunder, (ii) been filed with the
                              ----------                                       
Commission under the Securities Act and (iii) become effective under the
Securities Act; and  each Indenture has been qualified under the Trust Indenture
Act of 1939, as amended (the "Trust Indenture Act").  Copies of such
                              -------------------                   
registration statement and any amendments thereto have been delivered by the
Company to you.  As used in this Agreement, "Effective Date" means the date and
                                             --------------                    
the time as of which such registration statement, or the most recent post-
effective amendment thereto, if any, was declared effective by the Commission;
                                                                              
"Registration Statement" means the registration statement in the form it became
- -----------------------                                                        
or becomes, as the case may be, effective (including, if the Company omitted
information from the registration statement pursuant to Rule 430A(a) or files a
term sheet pursuant to Rule 434 of the Rules and Regulations, the information
deemed to be a part of the registration statement at the time it became
effective pursuant to Rule 430A(b) or Rule 434(d) of the Rules and Regulations),
including all documents incorporated by reference or deemed to be incorporated
by reference therein and the exhibits thereto and, in the event of any amendment
thereto or the filing of any abbreviated registration statement pursuant to Rule
462(b) of the Rules and Regulations relating thereto after the effective date of
such registration statement, shall also mean (from and after the effectiveness
of such amendment or the filing of such abbreviated registration statement) such
registration statement as so amended, together with any such abbreviated
registration statement; "Base Prospectus" means the prospectus included in the
                         ---------------                                      
Registration Statement; "Preliminary Prospectus" means any preliminary form of
                         ----------------------                               
prospectus supplement specifically relating to designated Offered Securities in
the form filed with, or transmitted for filing to the Commission pursuant to
Rule 424 of the Rules and Regulations, together with any accompanying
prospectus; "Prospectus Supplement" means any prospectus supplement specifically
             ---------------------                                              
relating to designated Offered Securities in the form first filed with, or
transmitted for filing to, the Commission pursuant to Rule 424 under the
Securities Act following the execution of a Terms Agreement with respect to such
Offered Securities; "Prospectus" means the Base Prospectus together with the
                     ----------                                             
Prospectus Supplement specifically relating to designated Offered Securities in
the form first filed with, or transmitted for filing to, the Commission pursuant
to Rule 424 under the Securities Act following the execution of a Terms
Agreement with respect to such Offered Securities, except that if such Base
Prospectus is amended or supplemented on or prior to the date on which such
Prospectus Supplement was first filed pursuant to Rule 424, the term
"Prospectus" shall refer to the Base Prospectus as so amended or supplemented
and as supplemented by such Prospectus Supplement; "Base Prospectus,"
                                                    ---------------  
"Prospectus," "Preliminary Prospectus" and "Prospectus Supplement" shall include
- -----------    ----------------------       ---------- ----------               
in each case the documents, if any, filed by the Company with the Commission
pursuant to the United States Securities Exchange Act of 1934, as amended (the
                                                                              
"Exchange Act"), and incorporated by reference therein; and "supplement" and
- -------------                                                ----------     
"amendment" shall be deemed to refer to and include any documents incorporated
- ----------                                                                    
by reference pursuant to Item 12 of Form S-3 under 
<PAGE>
 
                                      -3-

the Securities Act that are filed subsequent to the date of the Base Prospectus
by the Company with the Commission pursuant to the Exchange Act. Any reference
to any amendment to the Registration Statement shall be deemed to include any
annual report of the Company filed with the Commission pursuant to Section 13(a)
or 15(d) of the Exchange Act after the Effective Date that is incorporated by
reference in the Registration Statement. Any reference herein to information
"contained in," "contemplated by," "described in," "disclosed in," "included in"
 ------------    ---------------    ------------    ------------    ----------- 
or "set forth in" any of the foregoing documents, or words of similar effect,
    --------- --    
shall be deemed to include the documents incorporated or deemed to be
incorporated by reference therein.

          (b) The Registration Statement complies as to form in all material
respects, and the Prospectus and any further amendments or supplements to the
Registration Statement or the Prospectus will, when they become effective or are
filed with the Commission, as the case may be, comply as to form in all material
respects to the requirements of the Securities Act and the Rules and Regulations
and do not and will not, as of the applicable Effective Date (as to the
Registration Statement and any amendment thereto) and as of the applicable
filing date and applicable Closing Date (as to the Prospectus and any amendment
or supplement thereto) contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein (in the case of the Prospectus, in light of the circumstances
in which they were made), not misleading; provided, however, that no
representation or warranty is made as to information contained in or omitted
from the Registration Statement or the Prospectus in reliance upon and in
conformity with written information furnished to the Company by or on behalf of
any Underwriter specifically for use in the Registration Statement or the
Prospectus.  To the extent applicable, the copies of the Registration Statement
and each other document referred to in subparagraph (a) above that have been or
will be furnished to the Underwriters have been and will be identical to the
electronically transmitted copies thereof filed with the Commission pursuant to
the Commission's Electronic Data Gathering, Analysis and Retrieval System
("EDGAR"), except to the extent permitted by Regulation S-T.
- -------                                                     

          (c) If the Offered Securities are Debt Securities: Each Indenture
conforms in all material respects to the requirements of the Trust Indenture Act
and the applicable rules and regulations thereunder.

          (d) The documents incorporated or deemed to be incorporated by
reference in the Prospectus, when they were filed with the Commission, conformed
in all material respects with the requirements of the Securities Act or the
Exchange Act, as applicable, and the rules and regulations of the Commission
thereunder, and none of such documents contained an untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements therein, not misleading; and any further
documents so filed and incorporated or deemed to be incorporated by reference in
the Prospectus, when such documents become effective or are filed with the
Commission, as the case may be, will conform in all material respects to the
requirements of the Securities Act or the Exchange Act, as applicable, and the
rules and regulations of the Commission thereunder and will not contain an
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein not misleading.
<PAGE>
 
                                      -4-

          (e) The Company and each of its Subsidiaries have been duly
incorporated and are validly existing as corporations in good standing under the
laws of their respective jurisdictions of incorporation, with such exceptions
(as to Subsidiaries) as are not material to the Company and its Subsidiaries
taken as a whole. The Company and each of its Subsidiaries are duly qualified to
do business and are in good standing as foreign corporations in each
jurisdiction in which their respective ownership or lease of property or the
conduct of their respective businesses requires such qualification, except where
the failure to be so qualified and in good standing would not have a material
adverse effect on the consolidated financial condition, shareholders' equity,
results of operations or business of the Company and its Subsidiaries taken as a
whole, and where so qualified have all corporate power and authority necessary
to own, lease or operate their respective properties and to conduct the
businesses in which they are engaged as described in the Prospectus.  Except as
described in the Prospectus, the Company and its Subsidiaries hold all licenses,
certificates and permits from governmental authorities necessary for the conduct
of their businesses as described in the Prospectus, with such exceptions as are
not material to the Company and its Subsidiaries taken as a whole.

          (f) The Company had an authorized and issued capitalization as set
forth in the Prospectus (as of the date specified therein), and all of the
issued and outstanding shares of capital stock of the Company have been duly and
validly authorized and issued, are fully paid and non-assessable and conform in
all material respects to the description thereof contained in the Prospectus;
and all of the issued and outstanding shares of capital stock of each Subsidiary
of the Company have been duly and validly authorized and issued and are fully
paid and non-assessable and (except for directors' qualifying shares and except
as set forth in the Prospectus as of the date such information is given) are
owned directly or indirectly by the Company, free and clear of all liens,
encumbrances, equities or claims (other than any that are not material to the
Company and its Subsidiaries taken as a whole), except that certain of such
shares are reserved for transfer pursuant to stock option and other benefit
plans under which options to purchase common stock of such corporation owned by
its corporate parent are granted to certain employees, directors or consultants
of the Company and its Subsidiaries.

          (g) If the Offered Securities are Debt Securities:  The Debt
Securities have been duly and validly authorized by the Company and, when duly
executed, issued and delivered by the Company, and authenticated by the Trustee
pursuant to the provisions of the Senior Indenture or the Subordinated
Indenture, as the case may be, against payment therefor as provided in this
Agreement, will constitute valid and legally binding obligations of the Company
entitled to the benefits of the Indenture and enforceable against the Company in
accordance with their terms, subject to the effects of bankruptcy, insolvency,
fraudulent conveyance and transfer, reorganization, moratorium, or other similar
laws now or hereafter in effect relating to creditors' rights generally
("applicable bankruptcy laws") and general equitable principles (whether
  --------------------------                                            
considered in a proceeding in equity or at law); and the Debt Securities, when
issued and delivered, will conform in all material respects to the description
thereof contained in the Prospectus.
<PAGE>
 
                                      -5-

          (h) If the Offered Securities are Debt Securities:  Each Indenture has
been duly authorized by the Company, and when duly executed by the proper
officers of the Company (assuming due execution and delivery by the Trustee) and
delivered by the Company, will constitute a valid and legally binding obligation
of the Company enforceable against it in accordance with its terms, subject to
the effects of applicable bankruptcy laws and general equitable principles
(whether considered in a proceeding in equity or at law); and each Indenture
conforms in all material respects to the description thereof contained in the
Prospectus.

          (i) If the Offered Securities are shares of Common Stock:  The
unissued shares of Common Stock have been duly and validly authorized and, when
issued and delivered against payment therefor as provided in this Agreement,
such shares will be duly and validly issued, fully paid and non-assessable and
will conform in all material respects to the description thereof contained in
the Prospectus.

          (j) If the Offered Securities are convertible into shares of Common
Stock: The shares of Common Stock reserved for issuance upon conversion of
convertible Debt Securities have been validly authorized and reserved for such
purpose; and, if and when any of such convertible Debt Securities are converted
into shares of Common Stock in accordance with the conversion rights so
provided, such shares of Common Stock will be validly  issued, fully paid and
non-assessable and delivered in accordance with the terms of the Company's
corporate charter and by-laws; and when issued and delivered, such Common Stock
will conform in all material respects to the description thereof contained in
the Prospectus.

          (k) If the Offered Securities are shares of Common Stock:   There are
no preemptive or other rights to subscribe for or to purchase, nor any
restrictions upon the voting or transfer of any shares of the Common Stock,
including any Common Stock issuable upon conversion of any Offered Securities,
in each case, pursuant to the Company's corporate charter or by-laws or any
agreement or other instrument to which the Company is a party.

          (l) This Agreement has been duly authorized, executed and delivered by
the Company.

          (m) The execution, delivery and performance of this Agreement by the
Company, the execution, delivery and performance of each Indenture (if the
Offered Securities are Debt Securities) by the Company, and the consummation of
the transactions contemplated hereby and thereby, and the issuance and delivery
of the Offered Securities will not conflict with or result in a breach or
violation of any of the terms or provisions of, or constitute a default under
any indenture, lien, charge or encumbrance upon any property or mortgage, deed
of trust, loan agreement, or other agreement or instrument to which the Company
or any of its Subsidiaries is a party or by which it or any of them is bound or
to which any of the property or assets of the Company or any of their its
Subsidiaries is subject, except in each case for such conflicts, breaches,
violations or defaults which would not have a material adverse effect on the
consolidated financial condition, shareholders' equity, results of operations or
business of the Company and its Subsidiaries taken as a whole, nor will such
action result in any violation of the provisions of the charter or by-laws of
the Company or any of its Subsidiaries or any statute or 
<PAGE>
 
                                      -6-

any order, rule or regulation of any court or governmental agency or body having
jurisdiction over the Company or any of its Subsidiaries or any of their
respective material properties or assets; and except for the registration of the
Offered Securities under the Securities Act, the qualification of each Indenture
under the Trust Indenture Act, and such consents, approvals, authorizations,
registrations or qualifications as may be required under the Exchange Act or
applicable state or foreign securities laws or by the National Association of
Securities Dealers, Inc. in connection with the purchase and distribution of the
Offered Securities by the Underwriters, no consent, approval, authorization or
order of, or filing, registration or qualification of or with, any such court or
governmental agency or body is required for the execution, delivery and
performance of this Agreement and the Indentures (if the Offered Securities are
Debt Securities) by the Company and the consummation by the Company of the
transactions contemplated hereby and thereby.

          (n) Except as described in the Registration Statement or the
Prospectus, there are no agreements or understandings between the Company and
any person granting such person the right to require the Company to file a
registration statement under the Securities Act with respect to any material
amount of securities of the Company owned or to be owned by such person (other
than those registration statements that have already been filed) or to require
the Company to include such securities in the securities registered pursuant to
the Registration Statement or in any securities being registered pursuant to any
other registration statement filed by the Company under the Securities Act.

          (o) Neither the Company nor any of its Subsidiaries has sustained,
since the date of the latest financial statements included or incorporated by
reference in the Prospectus, any loss or interference with its business from
fire, explosion, flood or other calamity, whether or not covered by insurance,
or from any labor dispute or court or governmental action, order or decree,
which is material to the Company and its Subsidiaries taken as a whole,
otherwise than as set forth or contemplated in the Prospectus; except as
contemplated by or disclosed in the Prospectus or otherwise disclosed to the
public, since such date, the Company has not incurred any material liability or
obligation, or entered into any material transaction, or declared or paid any
dividend on its capital stock or issued or granted a material amount of
securities; and except as contemplated by or disclosed in the Prospectus, since
such date, there has not been any material change in the capital stock of the
Company or any material change in the capital stock of any of its Subsidiaries
that is material to the Company and its Subsidiaries taken as a whole or any
material change in the consolidated long-term debt of the Company, or any
material adverse change, or any development involving a prospective material
adverse change, in or affecting the business, management, financial condition,
shareholders' equity or results of operations of the Company and its
Subsidiaries taken as a whole, otherwise than as set forth or contemplated in
the Prospectus.

          (p) Arthur Andersen LLP, which has certified the financial statements
of the Company included in the Registration Statement, and any other accounting
firm which has certified any financial statements contained in the Registration
Statement, and whose reports are contained  in the Prospectus, are independent
public accountants as required by the Securities Act and the Rules and
Regulations.
<PAGE>
 
                                      -7-

          (q) The financial statements (including the related notes and
supporting schedules) filed as part of the Registration Statement or included or
incorporated by reference in the Prospectus present fairly in all material
respects the financial condition and results of operations of the entities
purported to be shown thereby at the dates and for the periods indicated; and
have been prepared in conformity with United States generally accepted
accounting principles or International Accounting Standards, as the case may be,
applied on a consistent basis throughout the periods involved, except as
otherwise expressly set forth therein.

          (r) Except as described in the Prospectus, there are no legal or
governmental proceedings pending or threatened by or against the Company or any
of its Subsidiaries or of which any material property or assets of the Company
or any of its Subsidiaries is the subject which are required to be disclosed in
the Registration Statement or the Prospectus.

          (s) There are no contracts or other documents which are required to be
described in the Prospectus by the Securities Act or by the Rules and
Regulations which have not been described in the Prospectus.

          (t) Neither the Company nor any of its Subsidiaries is

               (i) in violation in any material respect of its corporate charter
or by-laws, or

               (ii) except as described in the Prospectus, in default in any
material respect, and no event has occurred which, with notice or lapse of time
or both, would constitute such a default, in the due performance or observance
of any term, covenant or condition contained in any material indenture,
mortgage, deed of trust, loan agreement or other agreement to which the Company
or any of its Subsidiaries is a party or by which it or any of them is or may be
bound or to which any of the properties or assets of the Company or any of its
Subsidiaries is subject, except for such defaults which would not have a
material adverse effect on the consolidated financial condition, shareholders'
equity, results of operations or business of the Company and its Subsidiaries
taken as a whole; or

               (iii) except as described in the Prospectus, in violation in any
material respect of any law, ordinance, governmental rule, regulation or court
decree to which the Company or any of its Subsidiaries or its or any of their
respective property or assets may be subject or has failed to obtain any
material license, permit, certificate, franchise or other governmental
authorization or permit necessary to the ownership of its or their property or
to the conduct of its or their business, except for such violations or failures
which would not reasonably be expected to have a material adverse effect on the
consolidated financial condition, shareholders' equity, results of operations or
business of the Company and its Subsidiaries taken as a whole.

          (u) Except as described in the Prospectus, the Company and its
Subsidiaries own, or have valid rights to use, all items of real and personal
property which are material to the business of the Company and its Subsidiaries
taken as a whole, free and clear of all liens, encumbrances and claims which may
materially interfere with the consolidated financial condition, 
<PAGE>
 
                                      -8-

shareholders' equity, results of operations or business of the Company and its
Subsidiaries taken as a whole.

          (v) Except as described in the Prospectus, the Company and its
Subsidiaries own or possess adequate licenses or other rights to use all
intellectual property rights, including patents, trademarks, service marks,
trade names, copyrights or know-how, necessary to conduct their respective
businesses as described in the Prospectus, except where such failure, singularly
or in the aggregate, would not have a material adverse effect on the
consolidated financial condition, shareholders' equity, results of operations or
business of the Company and its Subsidiaries taken as a whole, and, except as
described in the Prospectus, none of  the Company or its Subsidiaries has
received any notice of infringement of or conflict with (or knows of any such
infringement of or conflict with) rights or claims of others with respect to any
patents, patent applications, trademarks, service marks, trade names, copyrights
or know-how, that is reasonably likely to result in a material adverse effect on
the consolidated financial condition, shareholders' equity, results of
operations or business of the Company and its Subsidiaries taken as a whole.

          (w) Neither the Company nor any of its Subsidiaries is an "investment
company" within the meaning of such term under the Investment Company Act of
1940 and the rules and regulations of the Commission thereunder.

          (x) Since the date which is three months prior to this Agreement, no
debt rating assigned to the Company by any "nationally recognized statistical
rating organization," as that term is defined by the Commission for purposes of
Rule 436(g)(2) of the Rules and Regulations, has been lowered or, to the
Company's knowledge, threatened to be lowered by any such rating organization
nor, to the Company's knowledge, has it been placed under surveillance or review
by any such rating organization.

          (y) Any certificate signed by any officer of the Company and delivered
to the Underwriters or to counsel for the Underwriters pursuant to this
Agreement shall be deemed a representation and warranty hereunder by the Company
to each Underwriter as to the matters covered thereby.

          2.   Purchase of the Offered Securities by the Underwriters.  On the
               ------------------------------------------------------         
basis of the representations and warranties contained in, and subject to the
terms and conditions set forth herein, the Company agrees to sell to the
Underwriters and each of the Underwriters, severally and not jointly, agrees to
purchase from the Company, at the price and/or principal amount, as the case may
be, set forth in the applicable Terms Agreement and in the respective amounts
and number of shares, as the case may be, of the designated Offered Securities
set forth opposite the name of each such Underwriter in Exhibit A to such Terms
                                                        ---------              
Agreement.  In addition, the Company may specify in any Terms Agreement relating
to any offering that the Company thereby grants to the Underwriters an option to
purchase up to the number of shares or principal amount of additional Offered
Securities (the "Option Securities," and if so purchased shall also be "Offered
                 -----------------                                      -------
Securities" herein) in the amount set forth in such Terms Agreement.  The option
- ----------                                                                      
thereby granted is exercisable as provided in Section 4 hereof, shall expire at
the close of business on the 30th day after the date of the applicable Terms
Agreement (unless otherwise 
<PAGE>
 
                                      -9-


specified therein) and will be granted solely for the purpose of covering over-
allotments which may be made in connection with the applicable offering. The
Option Securities shall be purchased severally for the account of the
Underwriters in proportion to the number or amount of Offered Securities set
opposite the name of such Underwriters in Exhibit A of the applicable Terms
                                          ---------       
Agreement. The respective purchase obligations of each Underwriter with respect
to the Option Securities shall be adjusted by the managing Underwriter so that
no Underwriter shall be obligated to purchase Option Securities in amounts other
than in 100 share or $1,000 principal amount increments.

          3.   Offering of the Offered Securities by the Underwriters.  (a) The
               ------------------------------------------------------          
several Underwriters propose to offer the Offered Securities for sale upon the
terms and conditions set forth in the Prospectus and any amendment or supplement
thereto relating to the Offered Securities.

          (b) Each Underwriter severally agrees to comply with the following
restrictions in the offering and sale of any Debt Securities:

              (i) except to the extent permitted under U.S. Treasury Regulation
(S)1.163-5(c)(2)(i)(D) (the "D Rules"), (A) the Underwriters have not offered or
                             -------                                            
sold, and during the restricted period will not offer or sell, Debt Securities
in bearer form to a person who is within the United States or its possessions or
to a United States person, and (B) the Underwriters have not delivered, and will
not deliver, within the United States or its possessions definitive Debt
Securities in bearer form that are sold during the restricted period;

              (ii) The Underwriters and each of their affiliates that is
acquiring from them Debt Securities in bearer form for the purposes of offering
or selling such Debt Securities during the restricted period, presently have in
effect, and throughout the restricted period will have in effect, procedures
reasonably designed to ensure that such Underwriters and such affiliates and
their respective employees or agents who are directly engaged in selling Debt
Securities in bearer form are aware that such Debt Securities may not be offered
or sold during the restricted period to a person who is within the United States
or its possessions or to a United States person, except as permitted by the D
Rules;

              (iii) Each Underwriter that is a United States person, if any, is
acquiring, either as agent or on its own behalf, the Debt Securities in bearer
form for purposes of resale in connection with their original issuance, and if
it retains Debt Securities in bearer form for its own account, it will only do
so in accordance with the requirements of U.S. Treasury Regulation (S)1.163-
5(c)(2)(i)(D)(6); and

              (iv) With respect to each of the Underwriters' affiliates that
acquires from such Underwriter Debt Securities in bearer form for the purpose of
offering or selling such Debt Securities during the restricted period, such
Underwriter agrees that it will obtain from such affiliate for the benefit of
the Company the representations, warranties, covenants and agreements contained
in clauses (i), (ii) and (iii).
<PAGE>
 
                                      -10-

Terms used in this Section 3(b) have the meanings given to them by the U.S.
Internal Revenue Code and regulations thereunder, including the D Rules.

          (c) Each Underwriter severally represents and agrees that (i) it has
not offered or sold and will not offer or sell in the United Kingdom any Offered
Securities except to persons whose ordinary activities involve them in
acquiring, holding, managing or disposing of investments (as principal or agent)
for the purpose of their businesses or otherwise in circumstances which have not
resulted and will not result in an offer to the public in the United Kingdom
within the meaning of the Public Offers of Securities Regulations 1995 (the
"Regulations") or the Financial Services Act 1986, (ii) it has complied and will
- ------------                                                                    
comply with all applicable provisions of the Financial Services Act 1986 and the
Regulations with respect to anything done by it in relation to the Offered
Securities in, from or otherwise involving the United Kingdom and (iii) it has
only issued or passed on, and will only issue or pass on, in the United Kingdom
any document received by it in connection with the issue of the Offered
Securities if that person is of a kind described in Article 11(3) of the
Financial Services Act 1986 (Investment Advertisements) (Exemptions) Order 1996,
as amended, or is a person to whom the document may otherwise lawfully be issued
or passed on.

          (d) Each Underwriter, jointly and severally, represents and warrants
that it has not entered into, and agrees that it will not enter into, any
contractual arrangement with respect to the distribution or delivery of the Debt
Securities in bearer form, except with its respective affiliates, without the
prior written consent of the Company or pursuant to a form of selling agreement
containing restrictions substantially to the effect set forth in paragraph (b)
above.

          4.   Delivery of and Payment for the Offered Securities.  Delivery of
               --------------------------------------------------              
and payment for the Offered Securities shall be made at the headquarters office
of the managing Underwriter, or at such other location as may be agreed upon by
the Underwriters and the Company, at 10:00 a.m., Eastern time, on the business
day specified in the applicable Terms Agreement, or at such other time and date
as shall be agreed upon (each such date and time of payment and delivery being
herein called the "Closing Date") in the manner set forth in the applicable
                   ------------                                            
Terms Agreement.  Time shall be of the essence, and delivery at the time and
place specified pursuant to this Agreement is a further condition of the
obligation of each Underwriter hereunder. Upon delivery, the Offered Securities
shall be registered in such names and in such denominations as the Underwriters
shall request in writing not less than two full business days prior to the
Closing Date.  For the purpose of expediting the checking and packaging of the
certificates for the Common Stock, the Company shall make the certificates
representing the Common Stock available for inspection by the Underwriters in
New York, New York, not later than 2:00 p.m., Eastern time, on the business day
prior to the Closing Date.  The Debt Securities of a series may be issued in
whole or in part in the form of one or more global securities that will be
deposited with, or on behalf of, one or more depositories, or a nominee thereof,
identified in the Prospectus relating to such series.  In such a case, the
manner of delivery of such global securities will be set forth in the applicable
Terms Agreement, or if not so set forth, as described in the applicable
Prospectus.  At any time on or before the thirtieth day after the date of any
Terms Agreement relating to Option Securities, if applicable, the option granted
in Section 2 may be exercised by written notice being given to the Company by or
on behalf of the Underwriters.  Such notice 
<PAGE>
 
                                      -11-

shall set forth the aggregate number or amount of Option Securities as to which
the option is being exercised, the names in which the Option Securities are to
be registered if not in global form as set forth above, the denominations in
which the shares of Option Securities are to be issued and the date and time, as
determined by the Underwriters, when the Option Securities are to be delivered;
provided, however, that this date and time shall not be earlier than the Closing
Date nor earlier than the second business day after the date on which the option
shall have been exercised nor later than the third business day after the date
on which the option shall have been exercised. The date and time the Option
Securities are delivered are sometimes referred to as the "Option Closing Date".
                                                           -------------------
Delivery of and payment for the Option Securities shall be made at the place
specified in the first sentence of this Section 4 (or at such other place as
shall be determined by agreement between the Underwriters and the Company at
10:00 a.m., Eastern time, on the Option Closing Date). On the Option Closing
Date, the Company shall deliver or cause to be delivered the certificates
representing the Option Securities to the Underwriters for the account of each
Underwriter against payment to or upon the order of the Company of the purchase
price in the manner set forth in the applicable Terms Agreement. Time shall be
of the essence, and delivery at the time and place specified pursuant to this
Agreement is a further condition of the obligation of each Underwriter
hereunder. Upon delivery, the Option Securities shall be registered in such
names (if other than in global form) and in such denominations as the
Underwriters shall request in the aforesaid notice. For the purpose of
expediting the checking and packaging of certificates for the Option Securities
that are Common Stock, the Company shall make the certificates representing such
Common Stock available for inspection by the Underwriters in New York, New York,
not later than 2:00 p.m., Eastern time, on the business day prior to the Option
Closing Date.

          5.   Further Agreements of the Company.  The Company agrees:
               ---------------------------------                      

          (a) To prepare the Prospectus in a form reasonably approved by the
Underwriters and to file such Prospectus pursuant to Rule 424(b) under the
Securities Act not later than the Commission's close of business on the second
business day following the execution and delivery of the applicable Terms
Agreement or, if applicable, such earlier time as may be required by Rule
430A(a)(3) under the Securities Act; after the date of  the applicable Terms
Agreement, to make no further amendment or supplement to the Registration
Statement or to the Prospectus prior to the applicable Closing Date except as
permitted herein; to advise the Underwriters, promptly after it receives notice
thereof, of the time when any amendment to the Registration Statement has been
filed or becomes effective or any supplement to the Prospectus or any amended
Prospectus has been filed and to furnish the Underwriters with copies thereof;
to file promptly all reports and any definitive proxy or information statements
required to be filed by the Company with the Commission pursuant to Section
13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of the
Prospectus and for so long as the delivery of a prospectus is required in
connection with the offering or sale of the Offered Securities; to advise the
Underwriters, promptly after it receives notice thereof, of the issuance by the
Commission of any stop order or of any order preventing or suspending the use of
any Preliminary Prospectus or the Prospectus, of the suspension of the
qualification of the Offered Securities for offering or sale in any
jurisdiction, of the initiation or threatening of any proceeding for any such
purpose, of any request by the Commission for the amending or supplementing of
the Registration Statement or 
<PAGE>
 
                                      -12-

the Prospectus or for additional information; and, in the event of the issuance
of any stop order or of any order preventing or suspending the use of any
Preliminary Prospectus or the Prospectus or suspending any such qualification,
to use promptly its best efforts to obtain its withdrawal;

          (b) To furnish, promptly upon request by the representatives of the
Underwriters named in any applicable Terms Agreement (the "Representatives" and
                                                           ---------------     
if no Representatives are so named, then any references herein to the
Representatives shall be deemed to refer to the Underwriters), to the
Underwriters and to counsel for the Underwriters a copy of the Registration
Statement as originally filed with the Commission, and each amendment thereto
filed with the Commission, including all consents and exhibits filed therewith;

          (c) To deliver promptly to the Underwriters such number of the
following documents as the Representatives shall reasonably request:

               (i) conformed copies of the Registration Statement as originally
filed with the Commission and each amendment thereto (in each case excluding
exhibits other than this Agreement and the Indentures and such other exhibits as
the Underwriters may reasonably request),

               (ii) each Preliminary Prospectus, the Prospectus and any amended
or supplemented Prospectus; and

               (iii) any document incorporated or deemed incorporated by
reference in the Prospectus (excluding exhibits thereto); and, if the delivery
of a prospectus is required at any time after the Effective Date in connection
with the offering or sale of the Offered Securities and if at such time any
events shall have occurred as a result of which the Prospectus as then amended
or supplemented would include an untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made when such Prospectus
is delivered, not misleading, or, if for any other reason it shall be necessary
to amend or supplement the Prospectus (or to file under the Exchange Act any
document incorporated by reference in the Prospectus) in order to comply with
the Securities Act or the Exchange Act, to notify the Underwriters and to file
such document and to prepare and furnish without charge to each Underwriter as
many copies as the Representatives may from time to time reasonably request of
an amended or supplemented Prospectus which will correct such statement or
omission or effect such compliance;

          (d) To file promptly with the Commission any amendment to the
Registration Statement or the Prospectus or any supplement to the Prospectus
that may, in the reasonable judgment of the Underwriters, be required by the
Securities Act, or requested by the Commission;

          (e) Prior to filing with the Commission any amendment to the
Registration Statement or supplement to the Prospectus, and promptly after
filing with the Commission (or, if between the signing of any applicable Terms
Agreement and the Closing Date thereunder, prior to filing with the Commission)
any document incorporated or deemed incorporated by reference in the 
<PAGE>
 
                                      -13-

Prospectus or any Prospectus pursuant to Rule 424 of the Rules and Regulations,
to furnish a copy thereof to the Underwriters and counsel for the Underwriters;

          (f) As soon as practicable after the date of this Agreement and every
Terms Agreement relating to designated Offered Securities, to make generally
available to its security holders an earnings statement of the Company and its
Subsidiaries (which need not be audited) complying with Section 11(a) of the
Securities Act and the Rules and Regulations (including, at the option of the
Company, Rule 158);

          (g) For a period of five years following the applicable Closing Date,
to furnish to the Underwriters, copies of all materials furnished by the Company
to all of its shareholders and all public reports and all reports and financial
statements furnished by the Company to the principal national securities
exchange upon which the Common Stock and any other Offered Securities may be
listed pursuant to requirements of or agreements with such exchange or to the
Commission pursuant to the Exchange Act or any rules or regulations of the
Commission thereunder;

          (h) Promptly from time to time to take such action as the Underwriters
may reasonably request to qualify the Offered Securities for offering and sale
under the securities laws of such jurisdictions as the Underwriters may
reasonably request and to comply with such laws so as to permit the continuance
of sales and dealings therein in such jurisdictions for as long as may be
necessary to complete the distribution of the Offered Securities; provided,
however, that in connection therewith the Company shall not be required to
qualify as a foreign corporation or to file a general consent to service of
process in any jurisdiction where it is not so qualified;

          (i) For a period of 90 days after the date of the Prospectus relating
to designated  Common Stock, or Offered Securities convertible into Common Stock
but only if specified in the applicable Terms Agreement (unless a different time
period is set forth in the applicable Terms Agreement), the Company will not,
directly or indirectly, offer for sale, sell or otherwise dispose of (or enter
into any hedging transaction or device which is designed to, or could be
expected to, result in the disposition by any person at any time in the future
of) any shares of Common Stock or any security convertible or exchangeable for
Common Stock (other than shares issuable pursuant to employee benefit plans,
stock option plans or other compensation plans existing on the date thereof or
pursuant to then currently outstanding options, warrants or rights and other
than the issuance of shares of Common Stock as consideration for the acquisition
of one or more businesses provided that such Common Stock may not be resold
prior to the expiration of the 90-day period referenced above), or sell or grant
options, rights or warrants with respect to any shares of Common Stock (other
than the grant of options pursuant to option plans existing on the date thereof)
otherwise than in accordance with this Agreement without the prior written
consent of the Representatives;

          (j) In the event designated Offered Securities are to be listed on a
securities exchange, to apply for any listing of such designated Offered
Securities on such securities exchange and to use its best efforts to complete
and maintain that listing, subject only to official 
<PAGE>
 
                                      -14-

notice of issuance, prior to the relevant Closing Date, or if not so listed by
such date, as soon as practical thereafter. In the case of Offered Securities
that are Debt Securities to be listed on a foreign securities exchange, if the
Company is not able to effect or maintain such listing, it will use its best
efforts to obtain and maintain the quotation for, or listing of, such Debt
Securities on such other stock exchange or exchanges as the Company may, with
the approval of the Representatives, determine;

          (k) To apply the net proceeds from the sale of the Offered Securities
being sold by the Company as set forth in the Prospectus; and

          (l) If the Offered Securities include Debt Securities, not to offer or
sell such Debt Securities in bearer form during the restricted period to a
person who is within the United States or its possessions or to a United States
person (each as defined in the U.S. Internal Revenue Code and regulations
thereunder, including the D Rules).

          6.   Expenses.  The Company agrees to pay:
               --------                             

          (a) the costs incident to the authorization, issuance, sale and
delivery of the Offered Securities and any taxes payable in that connection
(other than taxes based on income);

          (b) the costs incident to the preparation, printing and filing under
the Securities Act of the Registration Statement and any amendments and exhibits
thereto;

          (c) the costs of distributing the Registration Statement as originally
filed and each amendment thereto and any post-effective amendments thereof
(including, in each case, exhibits), any Preliminary Prospectus, the Prospectus
and any amendment or supplement to the Prospectus or any document incorporated
or deemed incorporated by reference therein, all as provided in this Agreement;

          (d) the costs, if any, of printing this Agreement and any other
related documents in connection with the offering, purchase, sale and delivery
of the Offered Securities;

          (e)  any applicable listing or other fees;

          (f) the filing fee of the National Association of Securities Dealers,
Inc. and the fees and expenses of qualifying the Offered Securities under the
securities laws of the several jurisdictions as provided in Section 5(h) and of
preparing, printing and distributing a Blue Sky Memorandum and a Legal
Investment Survey (including related fees and expenses of counsel to the
Underwriters);

          (g) any fees charged by securities rating services for rating any
Offered Securities; and

          (h) all other costs and expenses incident to the performance of the
obligations of the Company under this Agreement; provided that, except as
provided in this Section 6 and in 
<PAGE>
 
                                      -15-

Section 8 and Section 11, the Underwriters shall pay the costs and expenses of
their counsel, any transfer taxes on the Offered Securities which they may sell,
the expenses of advertising any offering of the Offered Securities made by the
Underwriters and all other costs and expenses of the Underwriters and their
counsel not enumerated in this Section 6.

          7.   Conditions of Underwriters' Obligations.  The obligations of the
               ---------------------------------------                         
Underwriters to purchase and pay for any Offered Securities are subject to the
accuracy, when made, and on each Closing Date, of the representations and
warranties of the Company contained herein, to the performance by the Company of
its obligations hereunder and under any Terms Agreement, and to each of the
following additional terms and conditions:

          (a) At the applicable Closing Date, the Prospectus shall have been
timely filed with the Commission in accordance with Section 5(a); no stop order
suspending the effectiveness of the Registration Statement or any part thereof
shall have been issued and no proceeding for that purpose shall have been
initiated or threatened by the Commission; and any request of the Commission for
inclusion of additional information in the Registration Statement or the
Prospectus or otherwise shall have been complied with to the Representatives'
reasonable satisfaction.

          (b) No Underwriter shall have discovered and disclosed to the Company
on or prior to any Closing Date that the Registration Statement or the
Prospectus or any amendment or supplement thereto contains an untrue statement
of a fact that, in the opinion of counsel for the Underwriters, is material or
omits to state a fact that, in the opinion of such counsel, is material and is
required to be stated therein or is necessary to make the statements therein (in
the case of the Prospectus, in light of the circumstances in which they were
made), not misleading.

          (c) All corporate proceedings and other legal matters incident to the
authorization, form, validity and enforceability of this Agreement, any Terms
Agreement, the Indentures, the Offered Securities, the Registration Statement
and the Prospectus, and all other legal matters relating to this Agreement and
any Terms Agreement and the transactions contemplated hereby and thereby shall
be reasonably satisfactory in all material respects to counsel for the
Underwriters, and the Company shall have furnished to such counsel all documents
and information that they may reasonably request to enable them to pass upon
such matters.

          (d) Seth H. Hoogasian, Esq., General Counsel to the Company, shall
have furnished to the Underwriters his opinion, in such capacities, addressed to
the Underwriters and dated the Closing Date, in form and substance reasonably
satisfactory to counsel for the Underwriters, to the effect that:

              (i) The Company and each of its Significant Subsidiaries have been
duly incorporated and are validly existing as corporations in good standing
under the laws of their respective jurisdictions of incorporation. The Company
and each of its Significant Subsidiaries have all corporate power and authority
necessary to own, lease or operate their 
<PAGE>
 
                                      -16-

respective properties and to conduct the businesses in which they are engaged as
described in the Prospectus;

              (ii) The Company had an authorized capitalization as set forth in
the Prospectus (as of the date such information is given). All of the
outstanding shares of capital stock of each of the Company and its Significant
Subsidiaries are duly authorized and validly issued, and, to the best of such
counsel's knowledge, fully paid and non-assessable; to the best of such
counsel's knowledge, the Company owns, directly or indirectly through
Subsidiaries, the amount of the outstanding capital stock of its Significant
Subsidiaries, as described in the Prospectus (as of the date such information is
given), and to the best of such counsel's knowledge, such ownership is free and
clear of any lien, claim or encumbrance or any other claim of any third party
that is material to the Company and its Subsidiaries taken as a whole) (except
for certain obligations of the Company and its Subsidiaries pursuant to their
stock and employee benefit plans). To the best of such counsel's knowledge,
except as described in the Prospectus, including options granted or to be
granted pursuant to stock and employee benefit plans described therein, there
are no outstanding warrants or options to purchase any material number of shares
of the capital stock of the Company from the Company. Except as described in the
preceding sentence, there are no preemptive or other rights to subscribe for or
to purchase, nor any restriction upon the voting or transfer of, any shares of
the Common Stock, including any Common Stock issuable upon conversion of any
Offered Securities, in each case pursuant to the Company's corporate charter or
by-laws or any agreement or other instrument to which the Company is a party
known to such counsel;

              (iii) To the best of such counsel's knowledge, there are no
contracts or other documents which are required to be described in the
Prospectus by the Securities Act or by the Rules and Regulations which have not
been described in the Prospectus;

              (iv) The documents incorporated by reference in the Prospectus
(other than the financial statements and related schedules therein, as to which
such counsel need express no opinion), when they were filed with the Commission
complied as to form in all material respects with the requirements of the
Exchange Act and the rules and regulations of the Commission thereunder;

              (v) Except as described in Section 1(n) hereof, to the best of
such counsel's knowledge and except as described in the Prospectus, there are no
agreements or understandings between the Company and any person granting such
person the right to require the Company to file a registration statement under
the Securities Act with respect to any material amount of securities of the
Company owned or to be owned by such person (other than those registration
statements that have already been filed) or to require the Company to include
such securities in the securities registered pursuant to the Registration
Statement or in any securities being registered pursuant to any other
registration statement filed by the Company under the Securities Act;

              (vi) To the best of such counsel's knowledge, and other than as
set forth in the Registration Statement or the Prospectus, there are no legal or
governmental

<PAGE>
 
                                      -17-

proceedings pending or threatened by or against the Company or any of its
Subsidiaries or of which any material property or assets of the Company or any
of its Subsidiaries is the subject which are required to be disclosed in the
Registration Statement or the Prospectus;

              (vii)  If the Offered Securities are Debt Securities: The Debt
Securities have been duly and validly authorized by the Company and, when duly
executed, issued and delivered by the Company, and authenticated by the Trustee
pursuant to the provisions of each Indenture, against payment therefor as
provided in this Agreement, will constitute valid and legally binding
obligations of the Company entitled to the benefits of such Indenture and
enforceable against the Company in accordance with their terms, except as the
enforceability thereof may be limited by applicable bankruptcy laws and by
general equitable principles (regardless of whether the issue of enforceability
is considered in a proceeding in equity or at law), and the Debt Securities
conform as to legal matters in all material respects to the description thereof
contained in the Prospectus.

              (viii)  If the Offered Securities are Debt Securities: Each
Indenture has been duly authorized, executed and delivered by the Company, and
(assuming due execution and delivery by the Trustee) constitutes a valid and
legally binding obligation of the Company enforceable against the Company in
accordance with its terms, except as the enforceability thereof may be limited
by applicable bankruptcy laws and by general equitable principles (regardless of
whether the issue of enforceability is considered in a proceeding in equity or
at law); and each Indenture conforms as to legal matters in all material
respects to the description thereof contained in the Prospectus;

              (ix)  If the Offered Securities are shares of Common Stock:
The unissued shares of the Common Stock have been duly and validly authorized
and, when issued and delivered against payment therefor as provided in this
Agreement, such shares will be duly and validly issued, fully paid and non-
assessable; and the Common Stock conforms as to legal matters in all material
respects to the description thereof contained in the Prospectus;

              (x)  If the Offered Securities are convertible into shares of
Common Stock: The Common Stock reserved for issuance upon conversion of
convertible Debt Securities has been validly authorized and reserved for such
purpose; and, if and when any of such convertible Debt Securities are converted
into shares of Common Stock in accordance with the conversion rights so 
provided, such shares of Common Stock will be validly issued, fully paid and 
non-assessable and delivered in accordance with the terms of the Company's 
corporate charter and by-laws;

              (xi)  This Agreement has been duly authorized, executed and
delivered by the Company;

              (xii)  The issue and sale of the Offered Securities being
delivered on the Closing Date by the Company and the compliance by the Company
with all of the provisions of this Agreement and each Indenture, and the
consummation of the transactions contemplated hereby and thereby, will not
conflict with or result in a breach or violation of any of the terms or

<PAGE>
 
                                      -18-


provisions of, or constitute a default under, any material indenture, mortgage,
deed of trust, loan agreement or other agreement known to such counsel to which
the Company or any of its Subsidiaries is a party or by which the Company or any
of its Subsidiaries is bound or to which any of the property or assets of the
Company or any of its Subsidiaries is subject except for such conflicts,
breaches, violations or defaults which would not have a material adverse effect
on the consolidated financial condition, shareholders' equity, results of
operations or business of the Company and its Subsidiaries taken as a whole, nor
will such actions result in any violation of the charter or by-laws of the
Company or any provisions of any State or Federal statute or any order, rule or
regulation known to such counsel of any court or governmental agency or body
having jurisdiction over the Company or any of its Subsidiaries or any of their
respective material properties or assets (other than statutes, orders, rules and
regulations pertaining to securities laws matters, which are addressed elsewhere
in such opinion).

              (xiii) Except for the registration of the Offered Securities
under the Securities Act and such consents, approvals, authorizations,
registrations or qualifications as may be required under the Exchange Act, the
Trust Indenture Act and applicable state securities laws or by the National
Association of Securities Dealers, Inc., in connection with the purchase and
distribution of the Offered Securities by the Underwriters, no consent,
approval, authorization or order of, or filing or registration with, any such
court or governmental agency or body is required for the execution, delivery and
performance of this Agreement or the Indentures by the Company  and the
consummation by the Company of the transactions contemplated hereby and thereby.

              (xiv)  The Registration Statement was declared effective under
the Securities Act and each Indenture was qualified under the Trust Indenture
Act as of the date specified in such opinion, the Prospectus was filed with the
Commission pursuant to the subparagraph of Rule 424 specified in such opinion on
the date specified therein and no stop order suspending the effectiveness of the
Registration Statement has been issued and, to the best of such counsel's
knowledge, no proceeding for that purpose is pending or threatened by the
Commission;

              (xv)   The statements contained in the Prospectus under the
captions relating to the Offered Securities, insofar as they describe federal
statutes, rules and regulations, or portions thereof (other than those
pertaining to tax matters, as to which such counsel need not express any
opinion), constitute accurate descriptions thereof in all material respects; and

              (xvi)  The Registration Statement, as of the Effective Date,
and the Prospectus, as of the date it was filed with the Commission and as of
the Closing Date, and any further amendments or supplements thereto made by the
Company prior to the applicable Closing Date (other than the financial
statements and related schedules therein and all other financial and statistical
data included therein or omitted therefrom and other than the Form T-1, as to
which such counsel need express no opinion) complied as to form in all material
respects with the requirements of the Securities Act and the Rules and
Regulations; and each Indenture conforms in all material respects to the
requirements of the Trust Indenture Act and the applicable rules and regulations
thereunder.
<PAGE>
 
                                      -19-

          In rendering the foregoing opinions, such counsel may state that his
opinion is limited to matters governed by the federal laws of the United States
of America, the Delaware General Corporation Law and the laws of the
Commonwealth of Massachusetts.

          In addition, such counsel shall also have furnished to the
Underwriters a written statement, addressed to the Underwriters and dated the
Closing Date, in form and substance satisfactory to the Underwriters, to the
effect that such counsel has acted as counsel to the Company in connection with
the preparation of the Registration Statement, and based on the foregoing, such
counsel does not believe that (i) the Registration Statement (other than the
financial statements and related schedules and all other financial and
statistical data included or incorporated by reference therein or omitted
therefrom, the statements under the heading, "Certain United  States Federal Tax
Considerations," and the Form T-1, as to which such counsel need not express any
belief), as of the Effective Date, contained any untrue statement of a material
fact or omitted to state a material fact required to be stated therein or
necessary in order to make the statements therein not misleading, or that the
Prospectus (other than the financial statements and related schedules and all
other financial and statistical data included or incorporated by reference
therein or omitted therefrom, the statements under the heading, "Certain United
States Federal Tax Considerations," and the Form T-1, as to which such counsel
need not express any  belief), as of its date and the applicable Closing Date,
contains any untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary in order to make the statements
therein, in light of the   circumstances under which they were made, not
misleading or (ii) any document incorporated by reference in the Prospectus
(other than the financial statements and related schedules and all other
financial and statistical data included or incorporated by reference therein or
omitted therefrom and other than the Form T-1, as to which such counsel need not
express any belief) contained an untrue statement of a material fact or omitted
to state a material fact necessary in order to make the statements therein, in
light of the circumstances under which they were made, not misleading.  The
foregoing opinion and statement may be qualified by statements to the effect
that  such counsel does not assume any responsibility for the accuracy,
completeness or fairness of the statements contained in the Registration
Statement or the Prospectus except for the statements made in the Prospectus
under the captions relating to the designated Offered Securities and insofar as
such statements relate to the Offered Securities and concern legal matters
(other than tax matters).

          (e) If the applicable Prospectus Supplement refers to an opinion of
tax counsel for the Company relating to tax matters concerning the Offered
Securities, the Company shall have furnished to the Underwriters an opinion of
such counsel, addressed to the Underwriters, dated the Closing Date, to the
effect that the opinion of such counsel referred to in the Prospectus is
confirmed.

          (f) At the Closing Date, counsel for the Underwriters shall have been
furnished with such documents and opinions as they may reasonably require for
the purpose of enabling them to pass upon the issuance and sale of the Offered
Securities as contemplated herein and in each Terms Agreement and related
proceedings, or in order to evidence the accuracy of any of the representations
or warranties, or the fulfillment of any of the conditions, herein and therein
contained; and the Underwriters shall have received from counsel for the
<PAGE>
 
                                      -20-

Underwriters, such opinion or opinions, dated the Closing Date, with respect to
the issuance and sale of the Offered Securities, the Registration Statement, the
Prospectus and other related matters as the Underwriters may reasonably require.

          (g) At the time of execution of  each Terms Agreement, the
Underwriters shall have received from each of Arthur Andersen LLP, with respect
to the Company and any other accounting firm which has audited financial
statements included in the Registration Statement, letters, in form and
substance satisfactory to the Underwriters, addressed to the Underwriters and
dated the date of such Terms Agreement (i) confirming that they are independent
public accountants with respect to the Company or such other corporation, and
their respective Subsidiaries, as the case may be, within the meaning of the
Securities Act and are in compliance with the applicable requirements relating
to the qualification of accountants under Rule 2-01 of Regulation S-X of the
Commission, (ii) stating as of the date thereof (or with respect to matters
involving changes or developments since the respective dates as of which
specified financial information is given in the Prospectus, as of a date not
more than five days prior to the date thereof), the conclusions and findings of
such firm with respect to the financial information and other matters ordinarily
covered by "accountants' comfort letters" to underwriters in connection with
registered public offerings in accordance with Statement of Auditing Standards
No. 72.

          (h) With respect to the letters of the accounting firms referred to in
the preceding paragraph and delivered to the Underwriters concurrently with the
execution of each Terms Agreement (the "initial letters"), the Company shall
                                        ---------------                     
have furnished to the Underwriters letters (the "bring-down letters") of such
                                                 ------------------          
accountants, addressed to the Underwriters and dated the Closing Date (i)
confirming that they are independent public accountants within the meaning of
the Securities Act and are in compliance with the applicable requirements
relating to the qualification of accountants under Rule 2-01 of Regulation S-X
of the Commission, (ii) stating, as of the date of the bring-down letter (or,
with respect to matters involving changes or developments since the respective
dates as of which specified financial information is given in the Prospectus, as
of a date not more than five business days prior to the date of the bring-down
letter), the conclusions and findings of such firm with respect to the financial
information and other matters covered by the initial letters and (iii)
confirming in all material respects the conclusions and findings set forth in
the initial letters.

          (i) At each Closing Date, there shall not have been, since the
respective dates as of which information is given in the Registration Statement,
the Base Prospectus and any Preliminary Prospectus as in effect at the time of
execution of the applicable Terms Agreement, any material adverse change in the
consolidated financial condition, stockholders' equity, results of operations or
business of the Company and its Subsidiaries taken as a whole, whether or not
arising in the ordinary course of business, except as set forth in or
contemplated by such documents.
 
          (j) The Company shall have furnished to the Representatives a
certificate of the Company, signed by the Chairman of the Board, the Chief
Executive Officer, the Chief Financial Officer, the President or a Vice
President and the Treasurer, Secretary or an Assistant Secretary of the Company,
dated the Closing Date, to the effect that the signers of such certificate have
carefully examined the
<PAGE>
 
                                      -21-

Registration Statement, the Prospectus, any supplements to the Prospectus and
this Agreement and that, to the best of such person's knowledge:
 
               (i) the representations and warranties of the Company in this
     Agreement are true and correct on and as of the date of the certificate
     with the same effect as if made on the date of the certificate, and the
     Company has complied with all the agreements and satisfied all the
     conditions on its part to be performed or satisfied at or prior to the
     Closing Date;
 
               (ii) no stop order suspending the effectiveness of the
     Registration Statement has been issued and no proceedings for that purpose
     have been instituted or, to such person's knowledge, threatened; and
 
               (iii) since the respective dates as of which information is
     given in the Registration Statement, the Base Prospectus and any
     Preliminary  Prospectus as in effect at the time of execution of the
     applicable Terms Agreement, there has been no material adverse change in
     the consolidated financial condition, stockholders' equity, results of
     operations or business of the Company and its Subsidiaries taken as a
     whole, whether or not arising from transactions in the ordinary course of
     business, except as set forth in or contemplated by such documents.
 
          (k) (i) Neither the Company nor any of its Subsidiaries shall have
sustained since the respective dates as of which information is given in the
Registration Statement, the Base Prospectus and any Preliminary Prospectus as in
effect at the time of execution of the applicable Terms Agreement, any loss or
interference with its business from fire, explosion, flood or other calamity,
whether or not covered by insurance, or from any labor dispute or court or
governmental action, order or decree, which is material to the Company and its
Subsidiaries taken as a whole, otherwise than as set forth in or contemplated by
such documents or (ii) since the date of the most recent financial statements of
the Company contained in the Registration Statement, the Base Prospectus and any
Preliminary Prospectus as in effect at the time of execution of the applicable
Terms Agreement, there shall not have been any change in the capital stock or
consolidated long-term debt of the Company, except as set forth in the letters
described in paragraphs (g) or (h) of this Section 7, or any material adverse
change in the general affairs, operations, business, prospects, key personnel,
capitalization, financial condition, shareholders' equity or results of
operations of the Company and its Subsidiaries taken as a whole, otherwise than
as set forth in or contemplated by the Registration Statement, the Base
Prospectus and any Preliminary Prospectus as in effect at the time of execution
of the applicable Terms Agreement, the effect of which, in any such case
described in clause (i) or (ii), is, in the judgment of the Representatives or a
majority in interest of the Underwriters, so material and adverse as to make it
impracticable or inadvisable to proceed with the public offering or the delivery
of the Offered Securities being delivered on such Closing Date on the terms and
in the manner contemplated in the Prospectus.

          (l) Subsequent to the execution and delivery of this Agreement and
prior to the Closing Date, (i) no downgrading shall have occurred in the rating
accorded the Company's 
<PAGE>
 
                                      -22-

securities by any "nationally recognized statistical rating organization", as
that term is defined by the Commission for purposes of Rule 436(g)(2) of the
Rules and Regulations and (ii) no such organization shall have publicly
announced that it has under surveillance or review, with possible negative
implications, its rating of any of the Company's securities.

        (m) Subsequent to the execution and delivery of this Agreement there
shall not have occurred any of the following:

               (i) trading in securities generally on the New York Stock
Exchange, the American Stock Exchange, the NASDAQ National Market or in the 
over-the-counter market, or trading in any securities of the Company on any 
exchange or in the over-the-counter market, shall have been suspended or 
minimum prices shall have been established on any such exchange or such market
by the Commission, by such exchange or by any other regulatory body or
governmental authority having jurisdiction,

               (ii) a general banking moratorium shall have been declared by
federal or New York state authorities;

               (iii) the United States shall have become engaged in hostilities,
there shall have been an escalation in hostilities involving the United States
or there shall have been a declaration of a national emergency or war by the
United States; or

               (iv) there shall have occurred such a material adverse change in
general economic or financial conditions (or such a material adverse change in
international conditions the effect of which on the financial markets in the
United States shall be such) as to make it, in the judgment of the
Representatives or a majority in interest of the several Underwriters,
impracticable or inadvisable to proceed with the public offering or delivery of
the Offered Securities being delivered on such Closing Date on the terms and in
the manner contemplated in the Prospectus.

          All opinions, letters, evidence and certificates mentioned above or
elsewhere in this Agreement shall be deemed to be in compliance with the
provisions hereof only if they are in substance reasonably satisfactory to
counsel for the Underwriters.  The Company may rely on any waiver of such
conditions given by the Underwriters or counsel to the Underwriters as if given
by the Underwriters.

          8.   Indemnification and Contribution. (a) The Company shall indemnify
               --------------------------------                                 
and hold harmless each Underwriter, its directors, officers, partners and
employees and each such person, if any, who controls any Underwriter, within the
meaning of the Securities Act, from and against any and all loss, claim, damage
or liability, joint or several, or any action in respect thereof (including, but
not limited to any losses, claims, damages, liabilities or actions relating to
purchases and sales of the Offered Securities), to which that Underwriter,
director, officer, partner or employee or controlling person may become subject,
under the Securities Act or otherwise, insofar as such loss, claim, damage,
liability or action arises out of, or is based upon,
<PAGE>
 
                                      -23-

              (i)  any untrue statement or alleged untrue statement made by the
Company in Section 1 hereof ; or

              (ii) any untrue statement or alleged untrue statement of a
material fact contained in any Preliminary Prospectus, the Registration
Statement or the Prospectus or in any amendment or supplement thereto; or

              (iii) the omission or alleged omission to state in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or in any amendment or
supplement thereto, any material fact required to be stated therein or necessary
to make the statements therein (in the case of the Prospectus or any Preliminary
Prospectus, in light of the circumstances in which they were made) not
misleading; or

              (iv) any act or failure to act or any alleged act or failure to
act by any Underwriter in connection with, or relating in any manner to, the
Offered Securities or the offering contemplated hereby, and which is included as
part of or referred to in any loss, claim, damage, liability or action arising
out of or based upon matters covered by clause (ii) or (iii) above (provided
that the Company shall not be liable under this clause (iv) to the extent that
it is determined in a final judgment by a court of competent jurisdiction that
such loss, claim, damage, liability or action resulted directly or indirectly
from any such acts or failures to act undertaken or omitted to be taken by such
Underwriter through its gross negligence, willful misconduct or breach of this
Agreement);

and shall reimburse each Underwriter and each such director, officer, partner,
employee or controlling person within 30 days after receiving written demand
therefor for any legal or other expenses reasonably incurred by that
Underwriter, director, officer, partner, employee or controlling person in
connection with investigating or defending or preparing to defend against any
such loss, claim, damage, liability or action; provided, however, that the
Company shall not be liable in any such case to the extent that any such loss,
claim, damage, liability or action arises out of, or is based upon, any untrue
statement or alleged untrue statement or omission or alleged omission in any
Preliminary Prospectus, the Registration Statement or the Prospectus, or in any
such amendment or supplement in reliance upon and in conformity with written
information concerning such Underwriter furnished to the Company through any
Underwriter by or on behalf of any Underwriter specifically for inclusion
therein; and provided, further, that the Company shall not be liable to any
Underwriter under the indemnity agreement in this subsection with respect to any
Preliminary Prospectus to the extent that any such loss, claim, damage,
liability or any action in respect thereof of such Underwriter results from the
fact that such Underwriter sold Offered Securities to a person as to whom it
shall be established that there was not sent or given, at or prior to the
written confirmation of such sale, a copy of the Prospectus or of the Prospectus
as then amended or supplemented in any case where such delivery is required by
the Securities Act if the Company has previously furnished copies thereof in
sufficient quantity to such Underwriter and the loss, claim, damage or liability
of such Underwriter results from an untrue statement or omission of a material
fact contained in the Preliminary Prospectus which was (i) identified to such
Underwriter at or prior to the earlier of the filing with the Commission or the
furnishing to such Underwriter of the Prospectus and (ii) corrected in the
Prospectus or in the 
<PAGE>
 
                                      -24-

Prospectus as then amended or supplemented. The foregoing indemnity agreement is
in addition to any liability which the Company may otherwise have to any
Underwriter or to any director, officer, partner, employee or controlling person
of that Underwriter.

          (b) Each Underwriter, severally and not jointly, shall indemnify and
hold harmless the Company and its directors, officers and employees, and each
person, if any, who controls the Company within the meaning of the Securities
Act, from and against any loss, claim, damage or liability, joint or several, or
any action in respect thereof (including, but not limited to, any losses,
claims, damages, liabilities or actions relating to the purchases and sales of
Offered Securities), to which the Company or any such director, officer,
employee or controlling person may become subject, under the Securities Act or
otherwise, insofar as such loss, claim, damage, liability or action arises out
of, or is based upon,

              (i) any untrue statement or alleged untrue statement of a material
fact contained in any Preliminary Prospectus, the Registration Statement or the
Prospectus or in any amendment or supplement thereto or

              (ii) the omission or alleged omission to state in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or in any amendment or
supplement thereto, any material fact required to be stated therein or necessary
to make the statements therein not misleading, but in each case only to the
extent that the untrue statement or alleged untrue statement or omission or
alleged omission was made in reliance upon and in conformity with written
information concerning such Underwriter furnished to the Company through the
Underwriters by or on behalf of that Underwriter specifically for inclusion
therein, and shall reimburse, within 30 days after receiving written demand
therefor, the Company and any such director, officer, employee or controlling
person for any legal or other expenses reasonably incurred by the Company or any
such director, officer, employee or controlling person in connection with
investigating or defending or preparing to defend against any such loss, claim,
damage, liability or action.  The foregoing indemnity agreement is in addition
to any liability which any Underwriter may otherwise have to the Company or any
such director, officer, employee or controlling person.

          (c) Promptly after receipt by an indemnified party under this Section
8 of notice of any claim or the commencement of any action, the indemnified
party shall, if a claim in respect thereof is to be made against the
indemnifying party under this Section 8, notify the indemnifying party in
writing of the claim or the commencement of that action; provided, however, that
the failure to notify the indemnifying party shall not relieve it from any
liability which it may have under this Section 8 except to the extent it has
been materially prejudiced by such failure and, provided further, that the
failure to notify the indemnifying party shall not relieve it from any liability
which it may have to an indemnified party otherwise than under Section 8 (a) or
(b).  If any such claim or action shall be brought against an indemnified party,
the indemnifying party shall be entitled to participate therein and, to the
extent that it wishes, jointly with any other similarly notified indemnifying
party, to assume the defense thereof with counsel reasonably satisfactory to the
indemnified party.  After notice from the indemnifying party to the indemnified
party of its election to assume the defense of such claim or action, the
<PAGE>
 
                                      -25-

indemnifying party shall not be liable to the indemnified party under this
Section 8 for any legal or other expenses subsequently incurred by the
indemnified party in connection with the defense thereof other than reasonable
costs of investigation; provided that the Representatives shall have the right
to employ counsel to represent you and those other Underwriters who may be
subject to liability arising out of any claim in respect of which indemnity may
be sought by the Underwriters against the Company hereunder if, in your
reasonable judgment, it is advisable for you and those Underwriters to be
represented by separate counsel, and in that event the fees and expenses of such
separate counsel shall be paid by the indemnifying party or parties, and
provided, further, in no event, shall the indemnifying party or parties be
responsible for the expenses of more than one separate counsel for all such
indemnified parties.

          No indemnifying party shall (i) without the prior written consent of
the indemnified parties (which consent shall not be unreasonably withheld),
settle or compromise or consent to the entry of any judgment with respect to any
pending or threatened claim, action, suit or proceeding in respect of which
indemnification or contribution may be sought hereunder (whether or not the
indemnified parties are actual or potential parties to such claim or action)
unless such settlement, compromise, consent or judgment (A) includes an
unconditional release of each indemnified party from all liability arising out
of such claim, action, suit or proceeding, and (B) does not include a statement
as to or an admission of fault, culpability or failure to act by or on behalf of
any indemnified party, or (ii) be liable for any settlement of any such action
effected without its written consent, but if settled with the consent of the
indemnifying party or if there be a final judgment for the plaintiff in any such
action, the indemnifying party agrees to indemnify and hold harmless any
indemnified party from and against any loss or liability by reason of such
settlement or judgment.

          (d) If the indemnification provided for in this Section 8 shall for
any reason be unavailable to or insufficient to hold harmless an indemnified
party under Section 8(a) or 8(b) in respect of any loss, claim, damage or
liability, or any action in respect thereof, referred to therein, then each
indemnifying party shall, in lieu of indemnifying such indemnified party,
contribute to the amount paid or payable by such indemnified party as a result
of such loss, claim, damage or liability, or action in respect thereof,

              (i) in such proportion as shall be appropriate to reflect the
relative benefits received by the Company on the one hand and the Underwriters
on the other from the offering of the Offered Securities or

              (ii) if the allocation provided by clause (i) above is not
permitted by applicable law, in such proportion as is appropriate to reflect not
only the relative benefits referred to in clause (i) above but also the fault of
the Company on the one hand and the Underwriters on the other with respect to
the statements or omissions which in such loss, claim, damage or liability, or
action in respect thereof, as well as any other relevant equitable
considerations. The relative benefits received by the Company on the one hand
and the Underwriters on the other with respect to such offering shall be deemed
to be in the same proportion as the total net proceeds from the offering of the
Offered Securities purchased under this Agreement (before deducting expenses)
received by the Company on the one hand, and the
<PAGE>
 
                                      -26-

total underwriting discounts and commissions received by the Underwriters with
respect to the Offered Securities purchased under this Agreement, on the other,
bear to the total gross proceeds from the offering of the Offered Securities
under this Agreement in each case as set forth in the table on the cover page of
the Prospectus. The relative fault shall be determined by reference to whether
the untrue or alleged untrue statement of a material fact or omission or alleged
omission to state a material fact relates to information supplied by the
Company, on the one hand, or the Underwriters on the other, the intent of the
parties and their relative knowledge, access to information and opportunity to
correct or prevent such statement or omission. The Company and the Underwriters
agree that it would not be just and equitable if contributions pursuant to this
Section were to be determined by pro rata allocation (even if the Underwriters
were treated as one entity for such purpose) or by any other method of
allocation which does not take into account the equitable considerations
referred to herein. The amount paid or payable by an indemnified party as a
result of the loss, claim, damage or liability, or action in respect thereof,
referred to above in this Section 8 shall be deemed to include, for purposes of
this Section 8(d), any legal or other expenses reasonably incurred by such
indemnified party in connection with investigating or defending any such action
or claim. Notwithstanding the provisions of this Section 8(d), no Underwriter
shall be required to contribute any amount in excess of the amount by which the
total price at which the Offered Securities underwritten by it and distributed
to the public was offered to the public exceeds the amount of any damages which
such Underwriter has otherwise paid or become liable to pay by reason of any
untrue or alleged untrue statement or omission or alleged omission. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation. The Underwriters' obligations
to contribute as provided in this Section 8(d) are several in proportion to
their respective underwriting obligations and not joint. The provisions of this
Section 8(d) shall be applied separately to each offering of Offered Securities.

          (e) The Underwriters severally confirm that the following statements
are correct and constitute information concerning such Underwriters furnished in
writing to the Company by or on behalf of the Underwriters specifically for
inclusion in the Registration Statement and the Prospectus: (i) the legend in
the Prospectus concerning stabilization and over-allotment by the Underwriters,
(ii) the statements with respect to the public offering of the Offered
Securities by the Underwriters set forth on the cover page of the Prospectus and
(iii) the statements  concerning concessions, allowances and reallowances and
stabilization and over-allotment set forth under the caption "Underwriting" in
the Prospectus.

          9.    Defaulting Underwriters.  If on the applicable Closing Date, any
                -----------------------                                         
Underwriter defaults in the performance of its obligations under this Agreement,
the remaining non-defaulting Underwriters shall be obligated to purchase (in
addition to the amount of Offered Securities which such Underwriters are
obligated to purchase pursuant to Section 2) the Offered Securities which the
defaulting Underwriter agreed but failed to purchase on such Closing Date in the
respective proportions to the amount of Offered Securities set opposite the
names of each remaining non-defaulting Underwriter in Exhibit A to the
                                                      ---------       
applicable Terms Agreement bears to the amount of the Offered Securities set
opposite the names of all the remaining non-defaulting Underwriters in Exhibit A
                                                                       ---------
to the applicable Terms Agreement; provided, however, that the 
<PAGE>
 
                                      -27-

remaining non-defaulting Underwriters shall not be obligated to purchase any of
the Offered Securities on such Closing Date if the total number of Offered
Securities which the defaulting Underwriter or Underwriters agreed but failed to
purchase on such date exceeds 10% of the total amount of the Offered Securities
to be purchased on such Closing Date. If the foregoing maximum percentage is
exceeded, the remaining non-defaulting Underwriters, or those other underwriters
satisfactory to the Underwriters who so agree, shall have the right, but shall
not be obligated, to purchase, in such proportion as may be agreed upon among
them, all the Offered Securities to be purchased on such Closing Date. If the
non-defaulting Underwriters or the other underwriters satisfactory to the
Underwriters do not elect to purchase the Offered Securities which the
defaulting Underwriter or Underwriters agreed but failed to purchase, this
Agreement shall terminate without liability on the part of any non-defaulting
Underwriter or the Company, except that the Company and the Underwriters will
continue to be liable for the payment of expenses to the extent set forth in
Sections 6 and 11 and continue to be liable under Section 8. As used in this
Agreement, the term "Underwriter" includes, for all purposes of this Agreement
                     -----------
unless the context requires otherwise, any party not listed in Exhibit A to any
                                                               ---------
applicable Terms Agreement who, pursuant to this Section 9, purchases Offered
Securities which a defaulting Underwriter agreed but failed to purchase. Nothing
contained herein shall relieve a defaulting Underwriter of any liability it may
have to the Company for damages caused by its default. If other underwriters are
obligated or agree to purchase the Offered Securities of a defaulting or
withdrawing Underwriter, either the Underwriters or the Company may postpone the
applicable Closing Date for up to seven full business days in order to effect
any changes that in the reasonable opinion of counsel for the Company or counsel
for the Underwriters may be necessary in the Registration Statement, the
Prospectus or in any other document or arrangement necessary to consummate the
transactions described herein.

          10.  Termination.  The obligations of the Underwriters under this
               -----------                                                 
Agreement may be terminated by the Representatives or by Underwriters which have
agreed to purchase in the aggregate 50% or more of the aggregate amount of
Offered Securities by notice given to and received by the Company prior to
delivery of and payment for the Offered Securities if, prior to that time, any
of the events described in Sections 7(i), (k), (l) or (m) (but as to subsection
(l) only, only if the offering is of Debt Securities) shall have occurred or if
the Underwriters shall decline to purchase the Offered Securities for any reason
permitted under this Agreement.

          11.  Reimbursement of Underwriters' Expenses.  If the Company shall
               ---------------------------------------                       
fail to tender the Offered Securities for delivery to the Underwriters by reason
of any failure, refusal or inability on the part of the Company to perform any
agreement on its part to be performed, or because any other condition of the
Underwriters' obligations hereunder required to be fulfilled by the Company is
not fulfilled, the Company will reimburse the Underwriters for all reasonable
out-of-pocket expenses (including fees and disbursements of counsel) incurred by
the Underwriters in connection with this Agreement and the proposed purchase of
the Offered Securities, and upon demand the Company shall pay the full amount
thereof to the Underwriters.  If this Agreement is terminated pursuant to
Section 9 by reason of the default of one or more Underwriters, the Company
shall not be obligated to reimburse any defaulting Underwriter for any of its
expenses incurred in connection with this Agreement.
<PAGE>
 
                                      -28-

          12.  Notices, etc.  All statements, requests, notices and agreements
               ------------                                                   
hereunder shall be in writing, and:

          (a) if to the Underwriters, shall be delivered or sent by mail, telex
or facsimile transmission as follows: if Lehman Brothers Inc. is the lead
managing Underwriter, c/o Lehman Brothers Inc., Three World Financial Center,
New York, New York 10285, Attention: Syndicate Department (Fax: 212-526-6588),
with a copy, in the case of any notice pursuant to Section 8(c), to the Director
of Litigation, Office of the General Counsel, Lehman Brothers Inc., World
Financial Center, 10th Floor, New York, NY 10285; and if Salomon Brothers Inc is
the lead managing Underwriter, c/o Salomon Smith Barney, 388 Greenwich Street,
New York, New York 10048, Attention: Syndicate Department (Fax: 212-723-8874);
and

          (b) if to the Company, shall be delivered or sent by mail, telex or
facsimile transmission to the address of the Company set forth in the
Registration Statement, Attention: General Counsel (Fax: (781) 622-1283).

Any such statements, requests, notices or agreements shall take effect at the
time of receipt thereof.  The Company shall be entitled to act and rely upon any
request, consent, notice or agreement given or made on behalf of the
Underwriters by the Representatives.

          13.  Persons Entitled to Benefit of Agreement.  This Agreement shall
               ----------------------------------------                       
inure to the benefit of and be binding upon the Underwriters, the Company and
its successors.  This Agreement  and the terms and provisions hereof are for the
sole benefit of only those persons, except that (A) the representations,
warranties, indemnities and agreements of the Company contained in this
Agreement shall also be deemed to be for the benefit of the person or persons,
if any, who control any Underwriter within the meaning of Section 15 of the
Securities Act and the other persons specifically mentioned herein and (B) the
indemnity agreement of the Underwriters contained in Section 8(b) of this
Agreement shall be deemed to be for the benefit of the directors of the Company,
officers of the Company and any person controlling the Company within the
meaning of Section 15 of the Securities Act and the other persons specifically
mentioned herein.  Nothing in this Agreement is intended or shall be construed
to give any person, other than the persons referred to in this Section 13, any
legal or equitable right, remedy or claim under or in respect of this Agreement
or any provision contained herein.

          14.  Survival.  The respective indemnities, representations,
               --------                                               
warranties and agreements of the Company and the Underwriters contained in this
Agreement or made by or on behalf of them, respectively, pursuant to this
Agreement, shall survive the delivery of and payment for any Offered Securities
and shall remain in full force and effect, regardless of any investigation made
by or on behalf of any of them or any person controlling any of them.

          15.  Definition of the Terms "Business Day," "Significant Subsidiary"
               ----------------------------------------------------------------
and "Subsidiary."   For purposes of this Agreement, (a) "business day" means any
- ---------------                                          ------------           
day on which the New York Stock Exchange, Inc. is open for trading, (b)
"Subsidiary" has the meaning set forth in Rule 405 of the Rules and Regulations
- -----------                                                                    
and (c) "Significant Subsidiary" has the meaning set forth in Item 1-02(w) of
         ----------------------                                              
the Regulation S-X of the Rules and Regulations.
<PAGE>
 
                                      -29-

          16.  Governing Law.  This Agreement shall be governed by and construed
               -------------                                                    
in accordance with the laws of Massachusetts.

          17.  Counterparts.  This Agreement may be executed in counterparts
               ------------                                                 
and, if executed in more than one counterpart, the executed counterparts shall
each be deemed to be an original but all such counterparts shall together
constitute one and the same instrument.

          18.  Headings.  The headings herein are inserted for convenience of
               --------                                                      
reference only and are not intended to be part of, or to affect the meaning or
interpretation of, this Agreement.



                 [Remainder of page intentionally left blank]
<PAGE>
 
                                      -30-


          If the foregoing correctly sets forth the agreement between the
Company and the Underwriters, please indicate your acceptance in the space
provided for that purpose below.

                                    Very truly yours,

                                    THERMO ELECTRON CORPORATION

                                    By: /s/ John N. Hatsopoulos      
                                        ------------------------------
                                        Name:  John N. Hatsopoulos      
                                        Title: Chief Financial Officer 
 
Accepted:

Lehman Brothers Inc.
Salomon Brothers Inc

By:  Lehman Brothers Inc.


By: /s/ Chris Kelly 
   -------------------------
   Name:  Chris Kelly  
   Title: Managing Director

<PAGE>
 
                                                                      SCHEDULE I
                                                                                
                                TERMS AGREEMENT


                                                  October 26, 1998

To each of the Underwriters
named on Exhibit A hereto

Dear Sirs:

     Thermo Electron Corporation, a Delaware corporation (the "Company"),
                                                               -------   
proposes to issue and sell $150 million aggregate principal amount of its senior
debt securities with the terms set forth below (the "Offered Securities").
                                                     ------------------    
Subject to the terms and conditions set forth herein or incorporated by
reference herein, the underwriters named on Exhibit A hereto (the
                                            ---------            
"Underwriters") offer to purchase, severally and not jointly, the principal
 ------------                                                              
amount of Offered Securities set forth therein opposite their respective names
at 99.074% of the principal amount thereof.

     The Offered Securities shall have the following terms:

Title:                         7.625% Notes due 2008

Maturity:                      October 30, 2008

Interest rate:                 7.625% per annum

Price to public:               99.724%

Interest payment dates:        October 30 and April 30, commencing April 30,
                               1999

Redemption provisions:         Redeemable at the option of the Company, in whole
                               or in part, at any time at a redemption price
                               equal to the greater of (i) 100% of the principal
                               amount thereof and (ii) the sum of the present
                               values of the remaining scheduled payments of
                               principal and interest thereon (not including the
                               portion of any such payments of interest accrued
                               as of the redemption date) discounted to the
                               redemption date on a semi-annual basis (assuming
                               a 360-day year consisting of twelve 30-day
                               months) at the Adjusted Treasury Rate (as defined
                               in the Senior Indenture) (determined on the third
                               Business Day (as defined in the Senior Indenture)
                               preceding such redemption date), plus 0.30%,
                               plus, in each case, accrued and unpaid interest
                               thereon to the redemption date.
<PAGE>
 
                                      -2-

Conversion provisions:         Not convertible into or exchangeable for Common
                               Stock of the Company.

Form:                          To be represented by one or more global notes
                               registered in the name of a nominee of the
                               Depository Trust Company.

     The Closing Date shall be October 29, 1998.

     All the provisions contained in the Underwriting Agreement dated October
26, 1998 between Lehman Brothers Inc. and Salomon Brothers Inc and the Company,
and in the Officers' Certificate to be dated October 29, 1998 executed by the
Company, are herein incorporated by reference (except for provisions that relate
to securities other than Offered Securities designated herein) in their entirety
and shall be deemed to be a part of this Terms Agreement to the same extent as
if such provisions had been set forth in full herein.  Terms defined in the
Underwriting Agreement are used herein as therein defined.

     The Company shall not be bound by the provisions of Section 5(i) of the
Underwriting Agreement.

     Application has been made to list the Offered Securities on the Luxembourg
Stock Exchange.

     Payment for the Offered Securities shall be made to or upon the order of
the Company on the Closing Date, by wire transfer in immediately available
funds.


                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
<PAGE>
 
                                      -3-

     Please accept this offer by signing a copy of this Terms Agreement in the
space set forth below.

                                                Very truly yours,
                                                
                                                THERMO ELECTRON CORPORATION
Accepted on October 26, 1998                    
                                                
LEHMAN BROTHERS INC.                             By: /s/ Kenneth J. Apicerno
SALOMON BROTHERS INC                                 -------------------------
                                                     Name:  Kenneth J. Apicerno
                                                     Title: Treasurer
By:  LEHMAN BROTHERS INC.
 
 
By:  /s/ Chris Kelly
     ------------------------------
     Name:  Chris Kelly
     Title:  Managing Director
<PAGE>
 
EXHIBIT A
- ---------

LIST OF UNDERWRITERS

<TABLE> 
<CAPTION> 
                                                                     Principal Amount
                     Underwriter                                         of Notes
                     -----------                                         --------
                                                         
 
<S>                                                             <C>
Lehman Brothers Inc...................................                  $ 75,000,000
Salomon Brothers Inc..................................                    75,000,000
                                                                         ------------
   Total..............................................                   $150,000,000
                                                                         ============ 
                                                                                            
</TABLE>

<PAGE>
 
                                                                     EXHIBIT 4.1


                          THERMO ELECTRON CORPORATION,
                                     ISSUER

                                       TO


                             BANKERS TRUST COMPANY,
                                    TRUSTEE



                                   INDENTURE
                                        

                         DATED AS OF October 29, 1998






                                DEBT SECURITIES



================================================================================
<PAGE>
 
                        Reconciliation and Tie between
     Trust Indenture Act of 1939 (the "Trust Indenture Act") and Indenture

<TABLE> 
<CAPTION> 

     Trust Indenture Act Section                        Indenture Section
     ---------------------------                        -----------------
<S>                                                     <C>
         Section 310(a)(1)......................................607
          (a)(2)................................................607
          (b)...................................................608
         Section 311............................................611
         Section 312(a).........................................701
          (b)...................................................702
          (c)...................................................702
         Section 313(a).........................................703
          (b)(2)................................................703
          (c)...................................................703
          (d)...................................................703
         Section 314(a).........................................704
          (c)(1)................................................102
          (c)(2)................................................102
          (e)...................................................102
          (f)...................................................102
         Section 315(a).........................................601
         (b)....................................................602
         (c)...............................................601, 602
         (d)....................................................601
         (e)....................................................515
         Section 316(a).........................................101
          (a)(1)(A)........................................502, 512
          (a)(1)(B).............................................513
          (b)...................................................508
         (c)....................................................104
         Section 317(a)(1)......................................503
          (a)(2)................................................504
          (b)..................................................1003
         Section 318(a).........................................108
         (c)....................................................108
 
</TABLE>
Note:  This reconciliation and tie shall not, for any purpose, be deemed to be
part of the Indenture.

Attention should also be directed to Section 318(c) of the Trust Indenture Act,
which provides that the provisions of Sections 310 to and including 317 are a
part of and govern every qualified indenture, whether or not physically
contained herein.
<PAGE>
 
                               TABLE OF CONTENTS

ARTICLE ONE:  DEFINITIONS AND OTHER PROVISIONS OF GENERAL 
               APPLICATION.....................................................1

 Section 101.  Definitions.....................................................1
 Section 102.  Compliance Certificates and Opinions...........................12
 Section 103.  Form of Documents Delivered to Trustee.........................12
 Section 104.  Acts of Holders................................................13
 Section 105.  Notices, Etc. to Trustee and Company...........................15
 Section 106.  Notice to Holders of Securities; Waiver........................15
 Section 107.  Language of Notices............................................16
 Section 108.  Conflict with Trust Indenture Act..............................16
 Section 109.  Effect of Headings and Table of Contents.......................17
 Section 110.  Successors and Assigns.........................................17
 Section 111.  Separability Clause............................................17
 Section 112.  Benefits of Indenture..........................................17
 Section 113.  Governing Law..................................................17
 Section 114.  Legal Holidays.................................................17
 Section 115.  Taxes..........................................................18

ARTICLE TWO:  SECURITIES FORMS................................................18

 Section 201.  Forms Generally................................................18
 Section 202.  [INTENTIONALLY OMITTED]........................................19
 Section 203.  Form of Trustee's Certificate of Authentication................19
 Section 204.  Securities in Global Form......................................19
 Section 205.  Form of Conversion Notice......................................20
               -------------------------

ARTICLE THREE:  THE SECURITIES................................................20

 Section 301.  Amount Unlimited; Issuable in Series...........................20
 Section 302.  Currency; Denominations........................................24
 Section 303.  Execution, Authentication, Delivery and Dating.................24
 Section 304.  Temporary Securities...........................................26
 Section 305.  Registration, Transfer and Exchange............................28
 Section 306.  Mutilated, Destroyed, Lost and Stolen Securities...............32
 Section 307.  Payment of Interest and Certain Additional Amounts; Rights to
              Interest and Certain Additional Amounts Preserved...............34
 Section 308.  Persons Deemed Owners..........................................36
 Section 309.  Cancellation...................................................37
 Section 310.  Computation of Interest........................................37
 Section 311.  CUSIP Numbers..................................................37
               -------------
 Section 312.  Notification of Withholding....................................37
               ---------------------------

ARTICLE FOUR:  SATISFACTION AND DISCHARGE OF INDENTURE........................38

 Section 401.  Satisfaction and Discharge.....................................38
               -------------------------- 
 Section 402.  Defeasance and Covenant Defeasance.............................39
<PAGE>
 
 Section 403.  Application of Trust Money.....................................43

ARTICLE FIVE:  REMEDIES.......................................................43

 Section 501.  Events of Default..............................................43
 Section 502.  Acceleration of Maturity; Rescission and Annulment.............45
 Section 503.  Collection of Indebtedness and Suits for Enforcement 
                by Trustee....................................................47
 Section 504.  Trustee May File Proofs of Claim...............................47
 Section 505.  Trustee May Enforce Claims Without Possession of Securities or
                Coupons.......................................................48
 Section 506.  Application of Money Collected.................................49
 Section 507.  Limitations on Suits...........................................49
 Section 508.  Unconditional Right of Holders to Receive Principal and Any
                Premium, Interest and Additional Amounts......................50
 Section 509.  Restoration of Rights and Remedies.............................50
 Section 510.  Rights and Remedies Cumulative.................................50
 Section 511.  Delay or Omission not Waiver...................................51
 Section 512.  Control by Holders of Securities...............................51
 Section 513.  Waiver of Past Defaults........................................51
 Section 514.  Waiver of Usury, Stay or Extension Laws........................52
 Section 515.  Undertaking for Costs..........................................52

ARTICLE SIX: THE TRUSTEE......................................................52

 Section 601.  Certain Rights of Trustee; Certain Duties and 
                Responsibilities..............................................52
 Section 602.  Notice of Defaults.............................................54
 Section 603.  Not Responsible for Recitals or Issuance of Securities.........55
 Section 604.  May Hold Securities; Act as Trustee Under Other Indenture......55
                                   ------------------------------------- 
 Section 605.  Money Held in Trust............................................55
 Section 606.  Compensation and Reimbursement.................................55
 Section 607.  Corporate Trustee Required; Eligibility........................56
 Section 608.  Resignation and Removal; Appointment of Successor..............57
 Section 609.  Acceptance of Appointment by Successor.........................58
 Section 610.  Merger, Conversion, Consolidation or Succession to Business....60
 Section 611.  Preferential Collection of Claims Against Company..............60
 Section 612.  Appointment of Authenticating Agent............................60
 Section 613.  Conflicting Interests..........................................62
 Section 614.  Protection of Agents...........................................62

ARTICLE SEVEN: HOLDERS LISTS AND REPORTS BY TRUSTEE AND 
                COMPANY.......................................................63

 Section 701.  Company to Furnish Trustee Names and Addresses of Holders......63
 Section 702.  Preservation of Information; Communications to Holders.........63
 Section 703.  Reports by Trustee.............................................64
 Section 704.  Reports by Company.............................................64

ARTICLE EIGHT: CONSOLIDATION, MERGER, CONVEYANCE OR 
                TRANSFER......................................................65

                                       ii
<PAGE>
 
 Section 801.  Company May Consolidate, Etc., Only on Certain Terms...........65
 Section 802.  Successor Corporation Substituted..............................66

ARTICLE NINE:  SUPPLEMENTAL INDENTURES........................................66

 Section 901.  Supplemental Indentures Without Consent of Holders.............66
 Section 902.  Supplemental Indentures With Consent of Holders................67
 Section 903.  Execution of Supplemental Indentures...........................69
 Section 904.  Effect of Supplemental Indentures..............................69
 Section 905.  Reference in Securities to Supplemental Indentures.............69
 Section 906.  Conformity with Trust Indenture Act............................69

ARTICLE TEN: COVENANTS........................................................70

 Section 1001.  Payment of Principal, Any Premium, Interest and Additional
                 Amounts......................................................70
 Section 1002.  Maintenance of Office or Agency...............................70
 Section 1003.  Money for Securities Payments to be Held in Trust.............72
 Section 1004.  Additional Amounts............................................73
 Section 1005.  Statement as to Compliance....................................76
 Section 1006.  Corporate Existence...........................................76

ARTICLE ELEVEN:  REDEMPTION OF SECURITIES.....................................77

 Section 1101.  Applicability of Article......................................77
 Section 1102.  Election to Redeem; Notice to Trustee.........................77
 Section 1103.  Selection by Trustee of Securities to be Redeemed.............79
 Section 1104.  Notice of Redemption..........................................79
 Section 1105.  Deposit of Redemption Price...................................81
 Section 1106.  Securities Payable on Redemption Date.........................81
 Section 1107.  Securities Redeemed in Part...................................82

ARTICLE TWELVE:  CONVERSION OF SECURITIES.....................................83

 Section 1201.  Conversion Privilege and Conversion Price.....................83
 Section 1202.  Exercise of Conversion Privilege..............................83
 Section 1203.  Fractions of Shares...........................................84
 Section 1204.  Adjustment of Conversion Price................................85
 Section 1205.  Notice of Adjustments of Conversion Price.....................87
 Section 1206.  Notice of Certain Corporate Action............................88
 Section 1207.  Company to Reserve Common Stock...............................89
 Section 1208.  Taxes on Conversions..........................................89
 Section 1209.  Covenant as to Common Stock...................................89
 Section 1210.  Cancellation of Converted Securities..........................89
 Section 1211.  Provision in Case of Consolidation, Merger or Sale 
                 of Assets....................................................89
 Section 1212.  Compliance with Governmental Requirements.....................90

ARTICLE THIRTEEN:  SINKING FUNDS..............................................90

 Section 1301.  Applicability of Article......................................90
 Section 1302.  Satisfaction of Sinking Fund Payments With Securities.........91
 Section 1303.  Redemption of Securities for Sinking Fund.....................91

                                      iii
<PAGE>
 
ARTICLE FOURTEEN: [INTENTIONALLY OMITTED].....................................92

ARTICLE FIFTEEN:  REPAYMENT AT THE OPTION OF HOLDERS..........................92

 Section 1501.  Applicability Of Article......................................92
 Section 1502.  Repayment Of Securities.......................................93
 Section 1503.  Notice of Repayment...........................................93
 Section 1504.  Exercise Of Option............................................94
 Section 1505.  When Securities Presented For Repayment Become Due And 
                 Payable......................................................95
 Section 1506.  Securities Repaid In Part.....................................96

ARTICLE SIXTEEN:  MEETINGS OF HOLDERS OF SECURITIES...........................96

 Section 1601.  Purposes for Which Meetings May Be Called.....................96
 Section 1602.  Call, Notice and Place of Meetings............................96
 Section 1603.  Persons Entitled to Vote at Meetings..........................97
 Section 1604.  Quorum; Action................................................97
 Section 1605.  Determination of Voting Rights; Conduct and Adjournment of
                 Meetings.....................................................98
 Section 1606.  Counting Votes and Recording Action of Meetings...............99

ARTICLE SEVENTEEN: [INTENTIONALLY OMITTED]....................................99

ARTICLE EIGHTEEN: [INTENTIONALLY OMITTED]....................................100


EXHIBITS
- --------

Exhibit A  Form of Trustee's Certificate of Authentication
Exhibit B  Conversion Notice
Exhibit C  Form of Certificate of Beneficial Ownership for Bearer Securities to
           be Provided to the Euroclear Operator or to Cedel Bank, societe
           anonyme
Exhibit D  Form of Certificate to be Given by the Euroclear Operator and Cedel
           Bank, societe anonyme
Exhibit E  Option to Elect Repayment upon a Repayment Event

                                       iv
<PAGE>
 
     INDENTURE, dated as of October 29, 1998 (the "Indenture"), between
                                                      ---------           
Thermo Electron Corporation, a corporation duly organized and existing under the
laws of the State of Delaware (hereinafter called the "Company"), having its
                                                       -------              
principal executive office located at 81 Wyman Street, Waltham, Massachusetts
02454-9046; and Bankers Trust Company, a banking corporation duly organized and
existing under the laws of the State of New York (hereinafter called the
"Trustee"), having its principal Corporate Trust Office located at Four Albany
- --------                                                                      
Street, 4th Floor, New York, New York 10006.



                                   RECITALS:

     The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (hereinafter called the
                                                                            
"Securities"), unlimited as to principal amount, to bear such rates of interest,
- -----------                                                                     
to mature at such time or times, to be issued in one or more series and to have
such other provisions as shall be fixed as provided in this Indenture.

     All things necessary to make the Securities and any Coupons (as herein
defined), when executed by the Company and authenticated and delivered
hereunder, the valid obligations of the Company, and to make this Indenture a
valid agreement of the Company in accordance with its terms have been done.


     This Indenture is subject to the provisions of the Trust Indenture Act of
1939, as amended, and the rules and regulations of the Securities and Exchange
Commission promulgated thereunder that are required to be part of this Indenture
and, to the extent applicable, shall be governed by such provisions.

     NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     For and in consideration of the premises and the purchase of the Securities
by the Holders (as herein defined) thereof, it is mutually covenanted and
agreed, for the equal and proportionate benefit of all Holders of the Securities
or of any series thereof and any Coupons (as herein defined), as follows:

                                  ARTICLE ONE

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 101.  Definitions.
              ----------- 

     Except as otherwise expressly provided in or pursuant to this Indenture or
unless the context otherwise requires, for all purposes of this Indenture:

          (1)  the terms defined in this Article have the meanings assigned to
     them in this Article and include the plural as well as the singular;
<PAGE>
 
          (2)  all other terms used herein which are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;

          (3)  all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with generally accepted accounting
     principles in the United States of America and, except as otherwise herein
     expressly provided, the terms "generally accepted accounting principles" or
                                    ----------------------------------------    
     "GAAP" with respect to any computation required or permitted hereunder
      ----                                                                 
     shall mean such accounting principles as are generally accepted in the
     United States of America, consistently applied, at the date of such
     computation;

          (4)  the words "Article" and "Section" refer to an Article and
                          -------       -------                         
     Section, respectively, of this Indenture;

          (5)  the words "herein," "hereof," "hereto" and "hereunder" and other
                          ------    ------    ------       ---------           
     words of similar import refer to this Indenture as a whole and not to any
     particular Article, Section or other subdivision;

          (6)  the word "or" is always used inclusively (for example, the phrase
                         --                                                     
     "A or B" means "A or B or both", not "either A or B but not both"); and

          (7)  the term "pursuant to this Indenture" shall include matters
     covered in an Officers' Certificate issued pursuant to Section 301 or in
     the Securities.

     Certain terms used principally in certain Articles hereof are defined in
those Articles.

     "Act," when used with respect to any Holders, has the meaning specified in
      ---                                                                      
Section 104.

     "Additional Amounts" has the meaning specified in Section 1004.
      ------------------                                            

     "Affiliate" of any specified Person means any other Person directly or
      ---------                                                            
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition,
"control," when used with respect to any specified Person, means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

     "Authenticating Agent" means any Person authorized by the Trustee pursuant
      --------------------                                                     
to Section 612 to act on behalf of the Trustee to authenticate Securities of one
or more series.

     "Authorized Newspaper" means a newspaper, in an official language of the
      --------------------                                                   
place of publication or in the English language, customarily published on each
day that is a Business Day in the place of publication, whether or not published
on days that are Legal Holidays in the place of publication, and of general
circulation in each place in connection with which the term is used or in the
financial community of each such place. Where successive publications are
required to be made in Authorized Newspapers, the successive publications may be
made in the same or in 

                                      -2-
<PAGE>
 
different newspapers in the same city meeting the foregoing requirements and in
each case on any day that is a Business Day in the place of publication.

     "Bankruptcy Law" has the meaning specified in Section 501.
      --------------                                           

     "Bearer Security" means any Security established pursuant to Section 201
      ---------------                                                        
which is payable to bearer.

     "Board of Directors," when used with reference to the Company means either
      ------------------                                                       
the board of directors or any duly authorized committee of such board of
directors of the Company.

     "Board Resolution," when used with reference to the Company, means a copy
      ----------------                                                        
of one or more resolutions, certified by the Corporate Secretary or an Assistant
Corporate Secretary of the Company, to have been duly adopted by its Board of
Directors and to be in full force and effect on the date of such certification,
and delivered to the Trustee.

     "Business Day," with respect to any Place of Payment, Place of Conversion
      ------------                                                            
or other location, means, unless otherwise specified with respect to any
Securities pursuant to Section 301, any day other than a Saturday, Sunday or
other day on which banking institutions in such Place of Payment, Place of
Conversion or other location are authorized or obligated by law, regulation or
executive order to close.

     "Cedel" has the meaning specified in Section 304(c).
      -----                                              

     "Closing Price Per Share" means, with respect to Common Stock, for any day,
      -----------------------                                                   
the reported last sales price regular way per share or, in case no such reported
sale takes place on such day, the average of the reported closing bid and
reported closing asked prices regular way or, if more than one in either case,
the average of the average reported closing bid and average reported closing
asked prices, as reported on the principal national or regional United States
securities exchange on which such Common Stock is listed or admitted to trading
or, if such Common Stock is not listed or admitted to trading on a United States
national or regional securities exchange, as reported by the National
Association of Securities Dealers Automated Quotation System or by the National
Quotation Bureau Incorporated.  In the absence of such quotations, the Closing
Price Per Share shall be reasonably determined on the basis of such quotations
or other data as the Company considers appropriate.

     "Commission" means the Securities and Exchange Commission, as from time to
      ----------                                                               
time constituted, created under the Exchange Act or, if at any time after the
execution of this Indenture such Commission is not existing and performing the
duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

     "Common Depository" means the Person specified as such pursuant to Section
      -----------------                                                        
301.

     "Common Stock" means the Common Stock, par value $1.00 per share, of the
      ------------                                                           
Company authorized at the date of this instrument as originally executed.
Subject to the provisions of Section 1201 and 1211, shares issuable on
conversion of Securities shall include only shares of 

                                      -3-
<PAGE>
 
Common Stock or shares of any class or classes of common stock resulting from
any reclassification or reclassifications thereof; provided, however, that if at
                                                   --------  -------
any time there shall be more than one such resulting class, the shares so
issuable on conversion of Securities shall include shares of all such classes,
and the shares of each such class then so issuable shall be substantially in the
proportion that the total number of shares of such class resulting from all such
reclassifications bears to the total number of shares of all such classes
resulting from all such reclassifications.

     "common stock" includes any stock of any class of capital stock which has
      ------------                                                            
no preference in respect of dividends or of amounts payable in the event of any
voluntary or involuntary liquidation, dissolution or winding up of the issuer
thereof and which, by its terms, is not subject to redemption by the issuer
thereof.

     "Company" means the Person named as the "Company" in the first paragraph of
      -------                                 -------                           
this Indenture until a successor Person shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Company" shall mean
                                                         -------            
such successor Person.

     "Company Request" and "Company Order" mean, respectively, a written request
      ---------------       -------------                                       
or order, as the case may be, signed in the name of the Company by any two
Officers or by any Officer and either an Assistant Treasurer or an Assistant
Corporate Secretary, of the Company and delivered to the Trustee.

     "Conversion Agent" means any Person authorized by the Company to convert
      ----------------                                                       
Securities in accordance with Article Twelve.

     "Conversion Date" means the date on which any Security, which is
      ---------------                                                
convertible by the terms and provisions of such Security established pursuant to
Section 301, and the duly signed and completed conversion notice shall have been
delivered to any Place of Conversion in accordance with the provisions of
Article Twelve.

     "Conversion Price" has the meaning specified in Section 1201.
      ----------------                                            

     "Corporate Secretary" or "Assistant Corporate Secretary" means the person
      -------------------      -----------------------------                  
elected by the Company's Board of Directors to hold the title of "Secretary" or
"Assistant Secretary" as provided for by the applicable corporate law of the
Company's jurisdiction of incorporation.

     "Corporate Trust Office" means the principal corporate trust office of the
      ----------------------                                                   
Trustee at which at any particular time its corporate trust business shall be
administered, which office at the date of original execution of this Indenture
is located at Four Albany Street, 4th Floor, New York, New York 10006.

     "Corporation" and "corporation" includes corporations, associations,
      -----------       -----------                                      
companies and business trusts.

     "Coupon" means any interest coupon appertaining to a Bearer Security.
      ------                                                              

                                      -4-
<PAGE>
 
     "Currency," with respect to any payment, deposit or other transfer in
      --------                                                            
respect of the principal of or any premium or interest on or any Additional
Amounts with respect to any Security, means Dollars, and, with respect to any
other payment, deposit or transfer pursuant to or contemplated by the terms
hereof or such Security, also means Dollars.

     "CUSIP Number" means the alphanumeric designation assigned to a Security by
      ------------                                                              
Standard & Poor's Ratings Services, CUSIP Service Bureau.

     "Custodian" has the meaning specified in Section 501.
      ---------                                           

     "Default" means any event or condition the occurrence of which would, with
      -------                                                                  
the lapse of time or the giving of notice, or both, constitute an Event of
Default.

     "Defaulted Interest" has the meaning specified in Section 307.
      ------------------                                           

     "Definitive Security" means any Security that is a Bearer Security (other
      -------------------                                                     
than a temporary global Bearer Security) or a Registered Security (other than a
temporary Registered Security).

     "Dollars" or "$" means a dollar or other equivalent unit of legal tender
      -------      -                                                         
for payment of public or private debts in the United States.

     "EUROCLEAR" has the meaning specified in Section 304(c).
      ---------                                              

     "Event of Default" has the meaning specified in Section 501.
      ----------------                                           

     "Exchange Act" means the Securities Exchange Act of 1934, as amended from
      ------------                                                            
time to time.

     "Exchange Date" means the date specified as such pursuant to Section 301.
      -------------                                                           

     "Foreign Entity" has the meaning specified in Section 801.
      --------------                                           

     "GAAP" means such accounting principles as are generally accepted in the
      ----                                                                   
United States of America as of the date or time of any computation required
hereunder.

     "Government Obligations" means securities which are (i) direct obligations
      ----------------------                                                   
of the United States or (ii) obligations of a Person controlled or supervised by
and acting as an agency or instrumentality of the United States where the timely
payment or payments thereunder are unconditionally guaranteed as a full faith
and credit obligation by the United States, and which, in the case of (i) or
(ii), are not callable or redeemable at the option of the issuer or issuers
thereof, and shall also include a depository receipt issued by a bank or trust
company as custodian with respect to any such Government Obligation or a
specific payment of interest on or principal of or other amount with respect to
any such Government Obligation held by such custodian for the account of the
holder of a depository receipt, provided that (except as required by law) such
                                -------- ----                                 
custodian is not authorized to make any deduction from the amount payable to the

                                      -5-
<PAGE>
 
holder of such depository receipt from any amount received by the custodian in
respect of the Government Obligation or the specific payment of interest on or
principal of or other amount with respect to the Government Obligation evidenced
by such depository receipt.

     "Holder," in the case of any Registered Security, means the Person in whose
      ------                                                                    
name such Security is registered in the Security Register and, in the case of
any Bearer Security, means the bearer thereof and, in the case of any Coupon,
means the bearer thereof.

     "Indenture" means this instrument as it may from time to time be
      ---------                                                      
supplemented or amended by one or more indentures supplemental hereto entered
into pursuant to the applicable provisions hereof and, with respect to any
Security, by the terms and provisions of such Security and any Coupon
appertaining thereto established pursuant to Section 301 (as such terms and
provisions may be amended pursuant to the applicable provisions hereof).

     "Independent Public Accountants" means accountants or a firm of accountants
      ------------------------------                                            
that, with respect to the Company and any other obligor under the Securities or
the Coupons, are independent public accountants within the meaning of the
Securities Act, and the rules and regulations promulgated by the Commission
thereunder, who may be the independent public accountants regularly retained by
the Company or who may be other independent public accountants.  Such
accountants or firm shall be entitled to rely upon any Opinion of Counsel as to
the interpretation of any legal matters relating to this Indenture or
certificates required to be provided hereunder.

     "Indexed Security" means a Security the terms of which provide that the
      ----------------                                                      
principal amount thereof payable at Stated Maturity may be more or less than the
principal face amount thereof at original issuance.

     "Interest" or "interest," with respect to any Original Issue Discount
      --------      --------                                              
Security, which by its terms bears interest only after Maturity, means interest
payable after Maturity and, when used with respect to a Security which provides
for the payment of Additional Amounts pursuant to Section 1004, includes such
Additional Amounts.

     "Interest Payment Date," with respect to any Security, means the Stated
      ----------------------                                                
Maturity of an installment of interest on such Security.

     "Interest Record Date" means any Regular Record Date or Special Record
      --------------------                                                 
Date.

     "Internal Revenue Code"  means the United States Internal Revenue Code of
      ---------------------                                                   
1986, as amended.

     "Investment Company Act" means the Investment Company Act of 1940, as
      ----------------------                                              
amended.

     "Legal Holidays" has the meaning specified in Section 114.
      --------------                                           

     "Maturity," with respect to any Security, means the date on which the
      --------                                                            
principal of such Security or an installment of principal becomes due and
payable as provided in or pursuant to 

                                      -6-
<PAGE>
 
this Indenture, whether at the Stated Maturity or by declaration of
acceleration, notice of redemption or repayment, notice of option to elect
repayment or otherwise, and includes the Redemption Date.

     "Office" or "Agency", with respect to any Securities, means an office or
      ------      ------                                                     
agency of the Company maintained or designated as a Place of Payment for such
Securities pursuant to Section 1002 or any other office or agency of the Company
maintained or designated for such Securities pursuant to Section 1002 or, to the
extent designated or required by Section 1002 in lieu of such office or agency,
the Corporate Trust Office of the Trustee.

     "Officer" means the Chairman of the Board, the President, any Vice
      -------                                                          
President (whether or not designated by a number or word added before or after
the title vice president), the Treasurer, the Chief Financial Officer or the
Corporate Secretary of the Company.

     "Officers' Certificate" of the Company means a certificate signed by two
      ---------------------                                                  
Officers or by any Officer and either an Assistant Treasurer or an Assistant
Corporate Secretary of the Company that complies with the requirements of
Section 314(e) of the Trust Indenture Act and is delivered to the Trustee.

     "Opinion of Counsel" means a written opinion of counsel, who (unless
      ------------------                                                 
otherwise provided herein) may be an employee of or counsel for the Company or
other counsel that, if required by the Trust Indenture Act, complies with the
requirements of Section 314(e) of the Trust Indenture Act.

     "Original Issue Discount Security" means any Security issued pursuant to
      --------------------------------                                       
this Indenture which provides for an amount less than the principal face amount
thereof to be due and payable upon acceleration of the Maturity thereof pursuant
to Section 502.

     "Other Additional Amounts" has the meaning specified in Section 1004.
      --------------------------                                          


     "Outstanding," when used with respect to any Securities, means, as of the
      -----------                                                             
date of determination, all such Securities theretofore authenticated and
delivered under this Indenture, except:

          (1)  any such Security theretofore canceled by the Trustee or the
     Security Registrar or delivered to the Trustee or the Security Registrar
     for cancellation;

          (2)  any such Security for whose payment at the Maturity thereof money
     in the necessary amount has been theretofore deposited pursuant hereto
     (other than pursuant to Section 402) with the Trustee or any Paying Agent
     (other than the Company) in trust or set aside and segregated in trust by
     the Company (if the Company shall act as its own Paying Agent), for the
     Holders of such Securities and any Coupons appertaining thereto, provided
                                                                      --------
     that, if such Securities are to be redeemed, notice of such redemption has
     ----                                                                      
     been duly given pursuant to this Indenture or provision therefor
     satisfactory to the Trustee has been made;

                                      -7-
<PAGE>
 
          (3)  any such Security with respect to which the Company has effected
     defeasance or covenant defeasance pursuant to Section 402, except to the
     extent provided in Section 402; and

          (4)  any such Security which has been paid pursuant to Section 306 or
     in exchange for or in lieu of which other Securities have been
     authenticated and delivered pursuant to this Indenture, unless there shall
     have been presented to the Trustee proof satisfactory to it that such
     Security is held by a bona fide purchaser in whose hands such Security is a
     valid obligation of the Company,

     provided, however, that in determining whether the Holders of the requisite
     --------  -------                                                          
     principal amount of Outstanding Securities have given any request, demand,
     authorization, direction, notice, consent or waiver hereunder or are
     present at a meeting of Holders of Securities for quorum purposes, (i) the
     principal amount of an Original Issue Discount Security that may be counted
     in making such determination and that shall be deemed to be Outstanding for
     such purposes shall be equal to the amount of the principal thereof that
     pursuant to the terms of such Original Issue Discount Security would be
     declared (or shall have been declared to be) due and payable upon a
     declaration of acceleration thereof pursuant to Section 502 at the time of
     such determination, and (ii) the principal amount of any Indexed Security
     that may be counted in making such determination and that shall be deemed
     outstanding for such purpose shall be equal to the principal face amount of
     such Indexed Security at original issuance, unless otherwise provided in or
     pursuant to this Indenture, and (iii) Securities beneficially owned by the
     Company or any other obligor upon the Securities or any Affiliate of the
     Company or such other obligor shall be disregarded and deemed not to be
     Outstanding, except that, in determining whether the Trustee shall be
     protected in making any such determination or relying upon any such
     request, demand, authorization, direction, notice, consent or waiver, only
     Securities which a Responsible Officer of the Trustee actually knows to be
     so owned shall be so disregarded. Securities so owned which shall have been
     pledged in good faith shall be regarded as Outstanding if the pledgee
     establishes to the satisfaction of the Trustee (a) the pledgee's right so
     to act with respect to such Securities and (b) that the pledgee is not the
     Company or any other obligor upon the Securities or any Coupons
     appertaining thereto or an Affiliate of the Company or such other obligor.

     "Paying Agent" means any Person authorized by the Company to pay the
      ------------                                                       
principal of, or any premium or interest on, or any Additional Amounts with
respect to, any Security or any Coupon or take any other actions specifically
provided in this Indenture on behalf of the Company.

     "Person" means any individual, corporation, partnership, association, joint
      ------                                                                    
venture, joint-stock company, limited liability company, trust, estate,
unincorporated organization or government or any agency or political subdivision
thereof.

     "Place of Conversion" means any city in which any Conversion Agent is
      -------------------                                                 
located.

                                      -8-
<PAGE>
 
     "Place of Payment," with respect to any Security, means the place or places
      ----------------                                                          
where the principal of, or any premium or interest on, or any Additional Amounts
with respect to, such Security are payable as provided in or pursuant to this
Indenture or such Security.

     "Predecessor Security" of any particular Security means every previous
      --------------------                                                 
Security evidencing all or a portion of the same indebtedness as that evidenced
by such particular Security; and, for the purposes of this definition, any
Security authenticated and delivered under Section 306 in exchange for or in
lieu of a lost, destroyed, mutilated or stolen Security or any Security to which
a mutilated, destroyed, lost or stolen Coupon appertains shall be deemed to
evidence the same indebtedness as the lost, destroyed, mutilated or stolen
Security or the Security to which a mutilated, destroyed, lost or stolen Coupon
appertains.

     "Redemption Date," with respect to any Security or portion thereof to be
      ---------------                                                        
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture or such Security.

     "Redemption Price," with respect to any Security or portion thereof to be
      ----------------                                                        
redeemed, means the price at which it is to be redeemed as determined by or
pursuant to this Indenture or such Security.

     "Registered Security" means any Security established pursuant to Section
      -------------------                                                    
201 which is registered in the Security Register.

     "Regular Record Date" for the interest payable on any Registered Security
      -------------------                                                     
on any Interest Payment Date therefor means the date, if any, specified in or
pursuant to this Indenture or such Security as the "Regular Record Date."

     "Repayment Date" has the meaning specified in Section 1502.
      --------------                                            

     "Repayment Event" has the meaning specified in Section 1502.
      ---------------                                            

     "Repayment Notice" has the meaning specified in Section 1503.
      ----------------                                            

     "Repayment Price" has the meaning specified in Section 1502.
      ---------------                                            

     "Responsible Officer," shall mean when used with respect to the Trustee,
      -------------------                                                    
any officer within the Corporate Trust Office including any Vice President,
Managing Director, Assistant Vice President, Corporate Secretary, Assistant
Corporate Secretary, Treasurer or Assistant Treasurer or any other officer of
the Trustee customarily performing functions similar to those performed by any
of the above designated officers and also, with respect to a particular matter,
any other officer to whom such matter is referred because of such officer's
knowledge and familiarity with the particular subject.

     "Security" or "Securities" means any note or notes, bond or bonds,
      --------      ----------                                         
debenture or debentures, or any other evidences of indebtedness, as the case may
be, authenticated and delivered under this Indenture; provided, however, that,
                                                      --------  -------       
if at any time there is more than one Person acting as Trustee under this
Indenture, "Securities," with respect to any such Person, shall 
            ----------                                                         

                                      -9-
<PAGE>
 
mean Securities authenticated and delivered under this Indenture, exclusive,
however, of Securities of any series as to which such Person is not Trustee.

     "Securities Act" means the Securities Act of 1933, as amended.
      ---------------                                              

     "Security Register" and "Security Registrar" have the respective meanings
      -----------------       ------------------                              
specified in Section 305.

     "Special Record Date" for the payment of any Defaulted Interest on any
      -------------------                                                  
Registered Security means a date fixed as such by the Trustee pursuant to
Section 307.

     "Stated Maturity," with respect to any Security or any installment of
      ---------------                                                     
principal thereof or interest thereon or any Additional Amounts with respect
thereto, means the date established by or pursuant to this Indenture or such
Security or Coupon as the fixed date on which the principal of such Security or
such installment of principal or interest is, or such Additional Amounts are,
due and payable.

     "Subsidiary" means a corporation or other entity, a majority of the
      ----------                                                        
outstanding voting securities or other ownership interests having ordinary
voting power to elect a majority of the corporate directors or other Persons
performing similar functions of which is owned, directly or indirectly, by the
Company or by one or more other Subsidiaries, or by the Company and one or more
other Subsidiaries.

     "Tax" has the meaning specified in Section 1004.
      ----                                           

     "Tax Affected Security" means any Security held by a non-United States
      ---------------------                                                
person to whom Additional Amounts have or will become payable.

     "Tax Law Change" means any change in, or amendment to, the laws (including
      --------------                                                           
any regulations or rulings promulgated thereunder) of the United States or any
political subdivision or taxing authority thereof or therein affecting taxation,
or any change in, or amendment to, the application or official interpretation of
such laws, regulations or rulings.

     "Trading Days" means (i) if the Common Stock is quoted on any system of
      ------------                                                          
automated dissemination of quotations of securities prices (other than a
national securities exchange), days on which trades may be effected through such
system and on which at least one trade of the Common Stock has occurred, (ii) if
the Common Stock is listed or admitted for trading on any national securities
exchange, days on which such national securities exchange is open for business
and on which at least one trade of the Common Stock has occurred or (iii) if the
Common Stock is not quoted on an automated quotation system or listed or
admitted to trading on any national securities exchange, days on which the
Common Stock is traded regular way in the over-the-counter market and for which
a closing bid and a closing asked price for the Common Stock are available.

     "Trust Indenture Act" means the Trust Indenture Act of 1939, as amended,
      -------------------                                                    
and any reference herein to the Trust Indenture Act or a particular provision
thereof shall mean such Act 

                                      -10-
<PAGE>
 
or provision, as the case may be, as amended or replaced from time to time or as
supplemented from time to time by rules or regulations adopted by the Commission
under or in furtherance of the purposes of such Act or provision, as the case
may be.

     "Trustee" means the Person named as the "Trustee" in the first paragraph of
      -------                                 -------                           
this instrument until a successor Trustee shall have become such with respect to
one or more series of Securities pursuant to the applicable provisions of this
Indenture, and thereafter "Trustee" shall mean or include each Person who is
                           -------                                          
then a Trustee hereunder; provided, however, that if at any time there is more
                          --------  -------                                   
than one such Person, "Trustee" as used with respect to the Securities of any
                       -------                                               
series shall mean the Trustee with respect to Securities of such series.

     "United States," except as otherwise provided in or pursuant to this
      -------------                                                      
Indenture or any Security, means the United States of America (including the
states thereof and the District of Columbia), its territories and possessions
and other areas subject to its jurisdiction.

     "United States person" is a person that is, for United States Federal
      --------------------                                                
income tax purposes, (a) a citizen or resident of the United States, (b) a
corporation, partnership or other entity created or organized in or under the
laws of the United States or any political subdivision thereof, (c) an estate,
the income of which is subject to United States Federal income taxation
regardless of source, (d) any trust if a court within the United States is able
to exercise primary supervision of the administration thereof and one or more
United States persons has the authority to control all substantial decisions
thereof, or (e) any other person included within the definition of United States
person under the Internal Revenue Code and the regulations thereunder.

     "U.S. Depository" or "Depository" means, with respect to any Security
      ---------------      ----------                                     
issuable or issued in the form of one or more global Registered Securities, the
Person designated as U.S. Depository or Depository by the Company in or pursuant
to this Indenture, which Person must be, to the extent required by applicable
law or regulation, a clearing agency registered under the Exchange Act, and, if
so provided with respect to any Security, any successor to such Person.  If at
any time there is more than one such Person, "U.S. Depository" or "Depository"
                                              ---------------      ---------- 
shall mean, with respect to any Securities, the qualifying entity which has been
appointed with respect to such Securities.

     "Vice President," when used with respect to the Company or the Trustee,
      --------------                                                        
means any vice president, whether or not designated by a number or a word or
words added before or after the title "Vice President."
                                       --------------  

Section 102.  Compliance Certificates and Opinions.
              ------------------------------------ 

     Except as otherwise expressly provided in this Indenture, upon any
application or request by the Company to the Trustee to take any action under
any provision of this Indenture, the Company shall furnish to the Trustee an
Officers' Certificate stating that all conditions precedent, if any, provided
for in this Indenture relating to the proposed action have been complied with
and an Opinion of Counsel stating that, in the opinion of such counsel, all such
conditions precedent, if any, have been complied with, except that in the case
of any such application or request as to which the furnishing of such document
is specifically required by any 

                                      -11-
<PAGE>
 
provision of this Indenture relating to such particular application or request,
no additional certificate or opinion need be furnished.

          Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture shall include:

          (1)  a statement that each individual signing such certificate or
opinion has read such condition or covenant and the definitions herein relating
thereto;

          (2)  a brief statement as to the nature and scope of the examination
or investigation upon which the statements or opinions contained in such
certificate or opinion are based;

          (3)  a statement that, in the opinion of each such individual, he has
made such examination or investigation as is necessary to enable him to express
an informed opinion as to whether or not such condition or covenant has been
satisfied or complied with; and

          (4)  a statement as to whether, in the opinion of each such
individual, such condition or covenant has been satisfied or complied with.

Section 103.  Form of Documents Delivered to Trustee.
              -------------------------------------- 

     In any case where several matters are required to be certified by or
covered by an opinion of any specified Person, it is not necessary that all such
matters be certified by or covered by the opinion of only one such Person, or
that they be so certified or covered by only one document, but one such Person
may certify or give an opinion with respect to some matters and one or more
other such Persons as to other matters, and any such Person may certify or give
an opinion as to such matters in one or several documents.

     Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon an Opinion of Counsel, unless such
officer knows, or in the exercise of reasonable care should know, that the
opinion with respect to the matters upon which his certificate or opinion is
based is erroneous.  Any such Opinion of Counsel may be based, insofar as it
relates to factual matters, upon a certificate or opinion of, or representations
by, an officer or officers of the Company stating that the information with
respect to such factual matters is in the possession of the Company unless such
counsel knows, or in the exercise of reasonable care should know, that the
certificate or opinion or representations with respect to such matters are
erroneous.

     Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture or any Security, they may, but need not, be
consolidated and form one instrument.

                                      -12-
<PAGE>
 
Section 104.  Acts of Holders.
              --------------- 

          (1) Any request, demand, authorization, direction, notice, consent,
     waiver or other action provided by or pursuant to this Indenture to be
     given or taken by Holders may be embodied in and evidenced by one or more
     instruments of substantially similar tenor signed by such Holders in person
     or by an agent duly appointed in writing.  If, but only if, Securities of a
     series are issuable as Bearer Securities, any request, demand,
     authorization, direction, notice, consent, waiver or other action provided
     in or pursuant to this Indenture to be given or taken by Holders of
     Securities of such series may, alternatively, be embodied in and evidenced
     by the record of Holders of Securities of such series voting in favor
     thereof, either in person or by proxies duly appointed in writing, at any
     meeting of Holders of Securities of such series duly called and held in
     accordance with the provisions of Article Sixteen, or a combination of such
     instruments and any such record.  Except as herein otherwise expressly
     provided, such action shall become effective when such instrument or
     instruments or record or both are delivered to the Trustee and, where it is
     hereby expressly required, to the Company. Such instrument or instruments
     and any such record (and the action embodied therein and evidenced thereby)
     are herein sometimes referred to as the "Act" of the Holders signing such
                                              ---                             
     instrument or instruments or so voting at any such meeting.  Proof of
     execution of any such instrument or of a writing appointing any such agent,
     or of the holding by any Person of a Security, shall be sufficient for any
     purpose of this Indenture and (subject to Section 315 of the Trust
     Indenture Act) conclusive in favor of the Trustee and the Company and any
     agent of the Trustee or the Company, if made in the manner provided in this
     Section.  The record of any meeting of Holders of Securities shall be
     proved in the manner provided in Section 1606.

          Without limiting the generality of this Section 104, unless otherwise
     provided in or pursuant to this Indenture, a Holder, including a Depository
     that is a Holder of a global Security, may make, give or take, by a proxy,
     or proxies, duly appointed in writing, any request, demand, authorization,
     direction, notice, consent, waiver or other Act provided in or pursuant to
     this Indenture or the Securities to be made, given or taken by Holders, and
     a Depository that is a Holder of a global Security may provide its proxy or
     proxies to the beneficial owners of interests in any such global Security
     through such Depository's standing instructions and customary practices.

          (2) The fact and date of the execution by any Person of any such
     instrument or writing may be proved in any reasonable manner which the
     Trustee deems sufficient and in accordance with such reasonable rules as
     the Trustee may determine; and the Trustee may in any instance require
     further proof with respect to any of the matters referred to in this
     Section 104.

          (3) The ownership, principal amount and serial numbers of Registered
     Securities held by any Person, and the date of the commencement and the
     date of the termination of holding the same, shall be proved by the
     Security Register.

                                      -13-
<PAGE>
 
          (4) The ownership, principal amount and serial numbers of Bearer
     Securities held by any Person, and the date of the commencement and the
     date of the termination of holding the same, may be proved by the
     production of such Bearer Securities or by a certificate executed, as
     depository, by any trust company, bank or other depository reasonably
     acceptable to the Company, wherever situated, if such certificate shall be
     deemed by the Company and the Trustee to be satisfactory, showing that at
     the date therein mentioned such Person had on deposit with such depository,
     or exhibited to it, the Bearer Securities therein described; or such facts
     may be proved by the certificate or affidavit of the Person holding such
     Bearer Securities, if such certificate or affidavit is deemed by the
     Company and the Trustee to be satisfactory.  The Trustee and the Company
     may assume that such ownership of any Bearer Security continues until (i)
     another certificate or affidavit bearing a later date issued in respect of
     the same Bearer Security is produced, or (ii) such Bearer Security is
     produced to the Trustee by some other Person, or (iii) such Bearer Security
     is surrendered in exchange for a Registered Security, or (iv) such Bearer
     Security is no longer Outstanding.  The ownership, principal amount and
     serial numbers of Bearer Securities held by the Person so executing such
     instrument or writing and the date of the commencement and the date of the
     termination of holding the same may also be proved in any other manner
     which the Company and the Trustee deem sufficient.

          (5) If the Company shall solicit from the Holders of any Registered
     Securities any request, demand, authorization, direction, notice, consent,
     waiver or other Act, the Company may at its option (but is not obligated
     to), by a Company Board Resolution, fix in advance a record date for the
     determination of Holders of Registered Securities entitled to give such
     request, demand, authorization, direction, notice, consent, waiver or other
     Act.  Notwithstanding Trust Indenture Act Section 316(c), such record date
     shall be the record date specified in or pursuant to such Board Resolution,
     which shall be a date not earlier than the date 30 days prior to the first
     solicitation of Holders generally in connection therewith and not later
     than the date such solicitation is completed.  If such a record date is
     fixed, such request, demand, authorization, direction, notice, consent,
     waiver or other Act may be given before or after such record date, but only
     the Holders of Registered Securities of record at the close of business on
     such record date shall be deemed to be Holders for the purpose of
     determining whether Holders of the requisite proportion of Outstanding
     Securities have authorized or agreed or consented to such request, demand,
     authorization, direction, notice, consent, waiver or other Act, and for
     that purpose the Outstanding Securities shall be computed as of such record
     date; provided that no such authorization, agreement or consent by the
     Holders of Registered Securities shall be deemed effective unless it shall
     become effective pursuant to the provisions of this Indenture not later
     than six months after the record date.

          (6) Any request, demand, authorization, direction, notice, consent,
     waiver or other Act by the Holder of any Security shall bind every future
     Holder of the same Security and any Coupon appertaining thereto and the
     Holder of every Security or Coupon issued upon the registration of transfer
     thereof or in exchange therefor or in lieu thereof in respect of anything
     done or suffered to be done by the Trustee, any Security Registrar, any
     Paying 

                                      -14-
<PAGE>
 
     Agent or the Company in reliance thereon, whether or not notation of such
     Act is made upon such Security.

          (7) Without limiting the foregoing, a Holder entitled hereunder to
     give or take any action hereunder with regard to any particular Security
     may do so with regard to all or any part of the principal amount of such
     Security or by one or more duly appointed agents each of which may do so
     pursuant to such appointment with regard to all or any different part of
     such principal amount.

Section 105.  Notices, Etc. to Trustee and Company.
              ------------------------------------ 

     Any request, demand, authorization, direction, notice, consent, waiver or
other Act of Holders or other document provided or permitted by this Indenture
to be made upon, given or furnished to, or filed with,

          (1) the Trustee by any Holder or the Company shall be sufficient for
     every purpose hereunder if made, given, furnished or filed in writing to or
     with the Trustee at its Corporate Trust Office, or

          (2) the Company by the Trustee or any Holder shall be sufficient for
     every purpose hereunder (unless otherwise herein expressly provided) if in
     writing and mailed, first-class postage prepaid, to the Company addressed
     to the attention of its Treasurer at the address of its principal office
     specified in the first paragraph of this instrument or at any other address
     previously furnished in writing to the Trustee by the Company.

Section 106.  Notice to Holders of Securities; Waiver.
              --------------------------------------- 

     Except as otherwise expressly provided in or pursuant to this Indenture,
where this Indenture provides for notice to Holders of Securities of any event,

          (1) such notice shall be sufficiently given to Holders of Registered
     Securities if in writing and mailed, first-class postage prepaid, to each
     Holder of a Registered Security affected by such event, at his address as
     it appears in the Security Register, not later than the latest date, and
     not earlier than the earliest date, prescribed for the giving of such
     notice; and

          (2) such notice shall be sufficiently given to Holders of Bearer
     Securities, if any, if published in an Authorized Newspaper in The City of
     New York and, if such Securities are then listed on any stock exchange
     outside the United States, in an Authorized Newspaper in such city as the
     Company shall advise the Trustee that such stock exchange so requires, on a
     Business Day at least once, such publication to be not earlier than the
     earliest date and not later than the latest date prescribed for the giving
     of such notice; provided that any additional notice to Holders of
                     -------------                                    
     Securities of any event may be provided at any time upon the request of the
     Company and shall provided in the manner set forth above.

                                      -15-
<PAGE>
 
     In any case where notice to Holders of Registered Securities is given by
mail, neither the failure to mail such notice, nor any defect in any notice so
mailed, to any particular Holder of a Registered Security shall affect the
sufficiency of such notice with respect to other Holders of Registered
Securities or the sufficiency of any notice to Holders of Bearer Securities
given as provided herein.  Any notice which is mailed in the manner herein
provided shall be conclusively presumed to have been duly given or provided. In
the case by reason of the suspension of regular mail service or by reason of any
other cause it shall be impracticable to give such notice by mail, then such
notification as shall be made with the approval of the Trustee shall constitute
a sufficient notification for every purpose hereunder.

     In case by reason of the suspension of publication of any Authorized
Newspaper or Authorized Newspapers or by reason of any other cause it shall be
impracticable to publish any notice to Holders of Bearer Securities as provided
above, then such notification to Holders of Bearer Securities as shall be given
with the approval of the Trustee shall constitute sufficient notice to such
Holders for every purpose hereunder.  Neither failure to give notice by
publication to Holders of Bearer Securities as provided above, nor any defect in
any notice so published, shall affect the sufficiency of any notice mailed to
Holders of Registered Securities as provided above.

     Where this Indenture provides for notice in any manner, such notice may be
waived in writing by the Person entitled to receive such notice, either before
or after the event, and such waiver shall be the equivalent of such notice.
Waivers of notice by Holders of Securities shall be filed with the Trustee, but
such filing shall not be a condition precedent to the validity of any action
taken in reliance upon such waiver.

Section 107.  Language of Notices.
              ------------------- 

     Any request, demand, authorization, direction, notice, consent, election or
waiver required or permitted under this Indenture shall be in the English
language, except that, if the Company so elects, any published notice may be in
an official language of the country of publication.

Section 108.  Conflict with Trust Indenture Act.
              --------------------------------- 

     This Indenture is subject to the provisions of the Trust Indenture Act that
are required to be part of this Indenture and shall, to the extent applicable,
be governed by such provisions.  If any provision hereof limits, qualifies or
conflicts with any duties under any required provision of the Trust Indenture
Act imposed hereon by Section 318(c) thereof, such required provision shall
control.

Section 109.  Effect of Headings and Table of Contents.
              ---------------------------------------- 

     The Article and Section headings herein and the Table of Contents are for
convenience only and shall not affect the construction hereof.

                                      -16-
<PAGE>
 
Section 110.  Successors and Assigns.
              ---------------------- 

     All covenants and agreements in this Indenture by the Company shall bind
its successors and assigns, whether so expressed or not.

Section 111.  Separability Clause.
              ------------------- 

     In case any provision in this Indenture, any Security or any Coupon shall
be invalid, illegal or unenforceable, the validity, legality and enforceability
of the remaining provisions shall not in any way be affected or impaired
thereby.

Section 112.  Benefits of Indenture.
              --------------------- 

     Nothing in this Indenture, any Security or any Coupon shall give to any
Person, other than the parties hereto, any Security Registrar, any Paying Agent
or Conversion Agent and their successors hereunder and the Holders of Securities
or Coupons, any benefit or any legal or equitable right, remedy or claim under
this Indenture.

Section 113.  Governing Law.
              ------------- 

     This Indenture, the Securities and any Coupons shall be governed by and
construed in accordance with the laws of the Commonwealth of Massachusetts
applicable to agreements made or instruments entered into and, in each case,
performed in said state, except that the rights, protections, obligations,
indemnities and immunities of the Trustee under this Indenture shall be governed
by the laws of the State of New York, without regard to the principles of
conflicts of laws of either state.

Section 114.  Legal Holidays.
              -------------- 

     Unless otherwise specified in or pursuant to this Indenture or any
Securities, in any case where any Interest Payment Date, Conversion Date,
Redemption Date, Repayment Date, Stated Maturity or Maturity of any Security
shall not be a Business Day at any Place of Payment or any Place of Conversion,
as the case may be, then (notwithstanding any other provision of this Indenture,
any Security or Coupon other than a provision in any Security or Coupon that
specifically states that such provision shall apply in lieu of this Section)
payment of interest or principal (and premium or Additional Amounts, if any) or
delivery for conversion of such Security need not be made at such Place of
Payment or Place of Conversion on such date, but such payment may be made on the
next succeeding Business Day at such Place of Payment or Place of Conversion
with the same force and effect as if made on the Interest Payment Date,
Conversion Date, Redemption Date, Repayment Date or at the Stated Maturity or
Maturity or by such last day for conversion, and no interest shall accrue on the
amount payable on such date or at such time for the period from and after such
Interest Payment Date, Redemption Date, Repayment Date, Conversion Date, Stated
Maturity or Maturity or last day for conversion, as the case may be, to the next
succeeding Business Day.

                                      -17-
<PAGE>
 
Section 115.  Taxes.
              ----- 

          The Company will pay all stamp taxes and other similar duties, if any,
that may be imposed by the United States or the United Kingdom, or any state or
political subdivision thereof or taxing authority therein, with respect to the
execution or delivery of this Indenture, or the issuance of the Securities or
Coupons, or the exchange from time to time of the temporary or permanent
Securities in global form for Registered Securities or Bearer Securities, or
with respect to the issue or delivery of shares of Common Stock on conversion of
Securities; provided, however, that the Company shall not be required to pay any
            --------  -------                                                   
tax or duty which may be payable in respect of the registration of transfer or
exchange of Securities and any transfer involved in the issue or delivery of
shares of Common Stock in a name other than that of the Holder of the Security
or Securities to be converted in accordance with the provisions of Article
Twelve, and no such issue or delivery shall be made unless and until the person
requesting such issue has paid to the Company the amount of any such tax or duty
or has established to the satisfaction of the Company that such tax or duty has
been paid; and provided further, that the Company shall not be required to pay
               -------- -------                                               
any tax or duty that may be payable in respect of any accrued interest paid in
connection with the conversion of the Securities.


                                  ARTICLE TWO

                               SECURITIES FORMS

Section 201.  Forms Generally.
              --------------- 

     Each Registered Security, Bearer Security, Coupon and temporary or
permanent global Security issued pursuant to this Indenture shall be in the form
established by or pursuant to a Company Board Resolution or in one or more
indentures supplemental hereto, shall have such appropriate insertions,
omissions, substitutions and other variations as are required or permitted by or
pursuant to this Indenture or any indenture supplemental hereto, and may have
such letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or as may, consistently herewith, be determined by the
officers executing such Security or Coupon as evidenced by their execution of
such Security or Coupon.  If the form of Registered Security, Bearer Security,
Coupon or temporary or permanent global Security is established by action taken
pursuant to a Board Resolution of the Company, a copy of an appropriate record
of such action shall be certified by the Corporate Secretary or an Assistant
Corporate Secretary of the Company, and delivered to the Trustee at or prior to
the delivery of the Company Order contemplated by Section 303 for the
authentication and delivery of such Registered Security, Bearer Security,
Coupon, temporary or permanent global Security.

     Definitive Securities and definitive Coupons shall be printed, lithographed
or engraved on steel engraved borders or may be produced in any other manner,
all as determined by the officers of the Company executing such Securities or
Coupons, as evidenced by their execution of such Securities or Coupons.

                                      -18-
<PAGE>
 
     Unless otherwise specified pursuant to Section 301 and except for temporary
global Bearer Securities (as contemplated by Section 304 hereof), Bearer
Securities shall have Coupons attached.

Section 202.  [INTENTIONALLY OMITTED].


Section 203.  Form of Trustee's Certificate of Authentication. 
              -----------------------------------------------  

     Subject to Section 612, the Trustee's certificate of authentication shall
be in substantially the form attached to this Indenture as Exhibit A.
                                                           ----------

Section 204.  Securities in Global Form.
              ------------------------- 

     Unless otherwise provided in or pursuant to this Indenture, the Securities
initially shall be issued in global form.  Securities issued in temporary or
permanent global form may provide that it or any number of such Securities shall
represent the aggregate principal amount of all Outstanding Securities of such
series (or such lesser amount as is permitted by the terms thereof) from time to
time endorsed thereon and may also provide that the aggregate amount of
Outstanding Securities represented thereby may from time to time be increased or
reduced to reflect exchanges.  Any global Security authenticated and delivered
hereunder may bear any legend or other statement required to comply with the
requirements of any Depository or Common Depository.  Any endorsement of any
global Security to reflect the amount, or any increase or decrease in the
amount, or changes in the rights of Holders, of Outstanding Securities
represented thereby shall be made in such manner and by such Person or Persons
as shall be specified therein.  Subject to the provisions of Section 303 and, if
applicable, Section 304, the Trustee shall deliver and redeliver any Security in
permanent global form in a manner mutually acceptable to the Company and the
Trustee and upon instructions given by an Officer.  If a Company Order pursuant
to Section 303 or 304 has been, or simultaneously is, delivered, any
instructions by the Company with respect to a Security in global form shall be
in writing but need not be accompanied by or contained in a Company Officers'
Certificate and need not be accompanied by an Opinion of Counsel.

     Notwithstanding the provisions of Section 307, unless otherwise specified
in or pursuant to this Indenture or any Securities, payment of principal of, any
premium and (except for temporary global Bearer Securities (as contemplated by
Section 304 hereof)) interest on, and any Additional Amounts in respect of, any
temporary or permanent global Security shall be made to the Person or Persons
specified therein.

     Notwithstanding the provisions of Section 308 and except as provided in the
preceding paragraph, the Company, the Trustee and any agent of the Company and
the Trustee shall treat as the Holder of such principal amount of Outstanding
Securities represented by a global Security (i) in the case of a global Security
in registered form, the Holder of such global Security in registered form, or
(ii) in the case of a temporary global Security in bearer form, the Person or
Persons specified pursuant to Section 301.

                                      -19-
<PAGE>
 
Section 205.  Form of Conversion Notice.
              ------------------------- 

     At the time of conversion of a Security in accordance with Article Twelve,
the Holder of such Security shall deliver to the Trustee, the Conversion Agent
and the Company a notice of conversion in substantially the form attached to
this Indenture as Exhibit B.
                  --------- 


                                 ARTICLE THREE

                                THE SECURITIES

Section 301.  Amount Unlimited; Issuable in Series.
              ------------------------------------ 

     The aggregate principal amount of Securities which may be authenticated and
delivered and outstanding under this Indenture is unlimited. The Securities may
be issued in one or more series.

     With respect to any Securities to be authenticated and delivered hereunder,
there shall be established in or pursuant to one or more Company Board
Resolutions, or pursuant to authority granted by one or more Company Board
Resolutions and, subject to Section 303, set forth or determined in the manner
provided in a Company Officers' Certificate, or established in one or more
indentures supplemental hereto prior to the issuance of any Securities of a
series any or all of the following; provided that if any of the following are
                                    -------- ----                            
already provided for in this Indenture, then such provisions shall be applicable
to each series established hereunder unless otherwise provided pursuant to the
Company Board Resolutions establishing such series and set forth in the
applicable Company Officers' Certificate or unless otherwise provided in any
Indenture or Indentures supplemental hereto pertaining to such series of
Securities:

          (1) the title or designation of such Securities and the series in
     which such Securities shall be included;

          (2) any limit upon the aggregate principal amount of the Securities of
     such title or designation or the Securities of such series which may be
     authenticated and delivered under this Indenture (except for Securities
     authenticated and delivered upon registration or transfer of, or in
     exchange for, or in lieu of, other Securities of such series pursuant to
     Section 304, 305, 306, 905 or 1107, upon repayment in part of any Security
     of such series pursuant to Article Fifteen, or upon surrender in part of
     any Security for conversion or exchange into other securities pursuant to
     its terms, or pursuant to the terms of such Securities);

          (3) if such Securities are to be issuable as Registered Securities, as
     Bearer Securities or alternatively as Bearer Securities and Registered
     Securities, and whether the Bearer Securities are to be issuable with
     Coupons, without Coupons or both, and any restrictions applicable to the
     offer, sale or delivery of the Bearer Securities and the terms, if any,
     upon which Bearer Securities may be exchanged for Registered Securities and
     vice versa;

                                      -20-
<PAGE>
 
          (4) if any of such Securities are to be issuable in global form, when
     any of such Securities are to be issuable in global form and (i) whether
     such Securities are to be issued in temporary or permanent global form or
     both, (ii) the extent to which, or the manner in which, any interest
     payment or Additional Amounts on a global Security on an Interest Payment
     Date will be paid and the manner in which any principal of or premium, if
     any, on any global Security will be paid, (iii) whether beneficial owners
     of interests in any such global Security may exchange such interests for
     Securities of the same series and of like tenor and of any authorized form
     and denomination, and the circumstances under which any such exchanges may
     occur, if other than in the manner specified in Section 305, (iv) the name
     of the Depository or the U.S. Depository, as the case may be, with respect
     to any global Security, (v) the name of the Common Depository, if
     applicable, and (vi) the Exchange Date, if applicable;

          (5) if any of such Securities are to be issuable as Bearer Securities
     or in global form, the date as of which any such Bearer Security or global
     Security shall be dated (if other than the date of original issuance of the
     first of such Securities to be issued);

          (6) if any of such Securities are to be issuable as Bearer Securities,
     whether interest in respect of any portion of a temporary Bearer Security
     in global form payable in respect of an Interest Payment Date therefor
     prior to the Exchange Date, shall be paid to any clearing organization with
     respect to the portion of such temporary Bearer Security held for its
     account and, in such event, the terms and conditions (including any
     certification requirements) upon which any such interest payment received
     by a clearing organization will be credited to the Persons entitled to
     interest payable on such Interest Payment Date, if other than as provided
     in Section 304;

          (7) the date or dates, or the method or methods, if any, by which such
     date or dates shall be determined, on which the principal of such
     Securities is payable;

          (8) the rate or rates at which such Securities shall bear interest, if
     any, or the method or methods, if any, by which such rate or rates are to
     be determined, the date or dates, if any, from which such interest shall
     accrue or the method or methods, if any, by which such date or dates are to
     be determined, the Interest Payment Dates, if any, on which such interest
     shall be payable and the Regular Record Dates, if any, for the interest
     payable on Registered Securities on any Interest Payment Date, whether and
     under what circumstances Additional Amounts on such Securities or any of
     them shall be payable, the notice, if any, to Holders regarding the
     determination of interest on a floating rate Security and the manner of
     giving such notice, and the basis upon which interest shall be calculated
     if other than that of a 360-day year of twelve 30-day months;

          (9) if in addition to or other than the Borough of Manhattan, The City
     of New York (or, in the case of Bearer Securities, except as otherwise
     provided herein, London, England), the place or places where the principal
     of, any premium and interest on or any Additional Amounts with respect to
     such Securities shall be payable, any of such Securities may be surrendered
     for registration of transfer and exchange, any of such 

                                      -21-
<PAGE>
 
     Securities may be surrendered for transfer, exchange or conversion in the
     circumstances described herein and notices or demands to or upon the
     Company in respect of such Securities and this Indenture may be served;

          (10) whether any of such Securities are to be redeemable at the option
     of the Company and, if so, the date or dates on which, the period or
     periods within which, the price or prices at which and the other terms and
     conditions upon which such Securities may be redeemed, in whole or in part,
     at the option of the Company and, if other than by a Company Board
     Resolution, the manner in which any election by the Company to redeem the
     Securities shall be evidenced;

          (11) if the Company is obligated to redeem or purchase any of such
     Securities pursuant to any sinking fund or analogous provision or at the
     option of any Holder thereof (including under Article Fifteen) and, if so,
     the date or dates on which, the period or periods within which, the price
     or prices at which and the other terms and conditions upon which such
     Securities shall be redeemed or purchased, in whole or in part, pursuant to
     such obligation, and any provisions for the remarketing of such Securities
     so redeemed or purchased;

          (12) the denominations in which any of such Securities that are
     Registered Securities shall be issuable if other than denominations of
     $1,000 and any integral multiple thereof, and the denominations in which
     any of such Securities that are Bearer Securities shall be issuable if
     other than the denominations of $1,000 and $10,000;

          (13) if other than the principal amount thereof, the portion of the
     principal amount of any of such Securities that shall be payable upon
     declaration of acceleration of the Maturity thereof pursuant to Section 502
     or the method by which such portion is to be determined;

          (14) if the amount of payments of principal of, any premium or
     interest on or any Additional Amounts with respect to such Securities may
     be determined with reference to an index, indices, formula or other method
     or methods (which index, indices, formula or method or methods may be
     based, without limitation, on one or more currencies, commodities, equity
     indices or other indices), and, if so, the terms and conditions upon which
     and the manner in which such amounts shall be determined and paid or
     payable;

          (15) any deletions from, modifications of or additions to the Events
     of Default or covenants of the Company with respect to any of such
     Securities, whether or not such Events of Default or covenants are
     consistent with the Events of Default or covenants set forth herein;

          (16) if either or both of Section 402(2) relating to defeasance or
     Section 402(3) relating to covenant defeasance shall  be applicable to the
     Securities of such series, or any covenants in addition to those specified
     in Section 402(3) relating to the Securities of such series which shall be
     subject to covenant defeasance, and any deletions from, or 

                                      -22-
<PAGE>
 
     modifications or additions to, the provisions of Article Four in respect of
     the Securities of such series shall apply;

          (17) the terms, if any, on which such Securities may be converted into
     or exchanged for other securities of the Company;

          (18) if any of such Securities are to be issuable in global form and
     are to be issuable in definitive form (whether upon original issue or upon
     exchange of a temporary Security) only upon receipt of certain certificates
     or other documents or satisfaction of other conditions, then the form and
     terms of such certificates, documents or conditions;

          (19) if there is more than one Trustee, the identity of the Trustees
     and, if not the Trustee, the identity of each Security Registrar, and the
     identity of each Paying Agent, Conversion Agent or Authenticating Agent
     with respect to such Securities;

          (20)  [INTENTIONALLY OMITTED]; and

          (21) any other terms of such Securities and any deletions from or
     modifications or additions to this Indenture in respect of such Securities
     (which terms shall not be inconsistent with the provisions of this
     Indenture, except as permitted by Section 901).

     All Securities of any one series and all Coupons, if any, appertaining to
Bearer Securities of such series shall be substantially identical except as to
denomination and Maturity and except as may otherwise be provided by the Company
in or pursuant to the Company Board Resolution and (subject to Section 303) set
forth in the Company Officers' Certificate or in any indenture or indentures
supplemental hereto pertaining to such series of Securities.  The terms of the
Securities of any series (as set forth in or pursuant to the applicable Board
Resolution) may provide, without limitation, that the Securities shall be
authenticated and delivered by the Trustee on original issue from time to time
upon telephonic or written order of persons designated in the Company Officers'
Certificate or supplemental indenture (telephonic instructions to be promptly
confirmed in writing by such person) and that such persons are authorized to
determine, consistent with such Company Officers' Certificate or any applicable
supplemental indenture, such terms and conditions of the Securities of such
series as are specified in such Company Officers' Certificate or supplemental
indenture.  All Securities of any one series need not be issued at the same time
and, unless otherwise so provided by the Company, a series may be reopened for
issuances of additional Securities of such series.

     If any of the terms of the Securities of any series shall be established
and approved by action taken by or pursuant to Board Resolutions of the Company,
copies of appropriate records of such actions shall be certified by the
Secretary or an Assistant Secretary of the Company, and delivered to the Trustee
at or prior to the delivery of the Officers' Certificates setting forth the
terms of such series.

                                      -23-
<PAGE>
 
Section 302.  Currency; Denominations.
              ----------------------- 

     The principal of, any premium and interest on and any Additional Amounts
with respect to the Securities shall be payable in Dollars. Unless otherwise
provided in or pursuant to this Indenture, Registered Securities shall be
issuable in registered form without Coupons in denominations of $1,000 and any
integral multiple thereof, and Bearer Securities shall be issuable in
denominations of $1,000 and $10,000 (or any other authorized denominations) with
Coupons attached.

Section 303.  Execution, Authentication, Delivery and Dating.
              ---------------------------------------------- 

     Securities shall be executed on behalf of the Company by any Officer under
its corporate seal reproduced thereon and attested by its Corporate Secretary
(provided that the Corporate Secretary shall not attest his or her own signature
as an Officer) or one of its Assistant Corporate Secretaries.  Coupons shall be
executed on behalf of the Company by any Officer.  The signature of any of these
officers on the Securities or any Coupons appertaining thereto may be manual or
facsimile.

     Securities and Coupons appertaining thereto bearing the manual or facsimile
signatures of individuals who were at any time the proper Officers of the
Company shall bind the Company, notwithstanding that such individuals or any of
them have ceased to hold such offices prior to the authentication and delivery
of such Securities or Coupons or did not hold such offices at the date of such
Securities or Coupons.

     At any time and from time to time after the execution and delivery of this
Indenture, the Company may deliver Securities, together with any Coupons
appertaining thereto, executed by the Company,  to the Trustee for
authentication and, provided that the Company Board Resolutions and Company
Officers' Certificate (if the terms of such Securities are provided therein
pursuant to authority granted by Company Board Resolution) or supplemental
indenture or indentures with respect to such Securities referred to in Section
301 and a Company Order for the authentication and delivery of such Securities
have been delivered to the Trustee, the Trustee in accordance with the Company
Order and subject to the provisions hereof and of such Securities shall
authenticate and deliver such Securities; provided, however, that, in connection
                                          -----------------                     
with its original issuance, no Bearer Security shall be mailed or otherwise
delivered to any location in the United States; and provided, further, that a
                                                    -----------------        
Bearer Security (other than a temporary global Bearer Security) may be delivered
outside the United States in connection with its original issuance only if the
certifications described in Section 304 are provided in accordance with the
provisions of Section 304.  If any Security shall be represented by a permanent
global Security, then, for purposes of this Section and Section 304, the
notation of a beneficial owner's interest therein upon original issuance of such
Security or upon exchange of a portion of a temporary global Security shall be
deemed to be delivery in connection with the original issuance of such
beneficial owner's interest in such permanent global Security.  Except as
permitted by Section 306 the Trustee for the Securities of a series shall not
authenticate and deliver any Bearer Security unless all appurtenant Coupons for
interest then matured other than matured coupons in default have been detached
and canceled.  If all the Securities of any one series are not to be issued at
one time and if a Board Resolution relating to such Securities or Officers'
Certificate 

                                      -24-
<PAGE>
 
shall so permit, such Officers' Certificate may include provisions for the
issuance of such Securities, including, without limitation, provisions with
respect to interest rate, Stated Maturity, date of issuance and date from which
interest, if any, shall accrue.

     In authenticating such Securities, and accepting the additional
responsibilities under this Indenture in relation to such Securities and any
Coupons appertaining thereto, the Trustee shall be entitled to receive, and
(subject to Sections 315(a) through 315(d) of the Trust Indenture Act) shall be
fully protected in relying upon:

          (1) an Opinion of Counsel to the effect that:

          (a) the form or forms and terms of such Securities and Coupons, if
     any, have been established or approved by or pursuant to a Board Resolution
     of the Company in conformity with Sections 201 and 301 of this Indenture;

          (b) all conditions precedent to the authentication and delivery of
     such Securities and Coupons, if any, appertaining thereto, have been
     complied with and that such Securities and Coupons, when completed by
     appropriate insertions, executed under the Company's corporate seal and
     attested by duly authorized officers of the Company, delivered by duly
     authorized officers of the Company to the Trustee for authentication
     pursuant to this Indenture, and authenticated and delivered by the Trustee
     and issued by the Company in the manner and subject to any conditions
     specified in such Opinion of Counsel, will constitute legally valid and
     binding obligations of the Company, enforceable in accordance with their
     terms, subject to bankruptcy, insolvency, reorganization, moratorium,
     arrangement, fraudulent conveyance, fraudulent transfer or other similar
     laws of general applicability to the Company and relating to or affecting
     creditors' rights and to general principles of equity (regardless of
     whether enforcement is sought in a proceeding in equity or at law); and

          (c) this Indenture has been qualified under the Trust Indenture Act;
     and

          (2) a Company Officers' Certificate stating that, to the best
     knowledge of the Persons executing such certificate, no Default or Event of
     Default with respect to any of the Securities shall have occurred and be
     continuing.

     If all of the Securities of any series are not to be issued at one time,
unless requested by the Trustee, it shall not be necessary to deliver an Opinion
of Counsel at the time of issuance of each Security, but such opinion, with such
modifications as counsel shall deem appropriate, shall be delivered at or before
the time of issuance of the first Security of such series.  After any such first
delivery, any separate request by the Company that the Trustee authenticate
additional Securities of such series for original issue will be deemed to be a
certification by the Company that all conditions precedent provided for in this
Indenture relating to authentication and delivery of such Securities continue to
have been complied with.

     The Trustee shall not be required to authenticate or to cause an
Authenticating Agent to authenticate any Securities if the issue of such
Securities pursuant to this Indenture will affect the 

                                      -25-
<PAGE>
 
Trustee's own rights, duties or immunities under the Securities and this
Indenture or otherwise in a manner which is not reasonably acceptable to the
Trustee or if the Trustee, being advised by counsel, determines that such action
may not lawfully be taken.

     Each Security shall be dated as of the date specified in or pursuant to
this Indenture.

     No Security or Coupon appertaining to such Security shall be entitled to
any benefit under this Indenture or be valid or obligatory for any purpose,
unless there appears on such Security a certificate of authentication
substantially in the form provided for in Section 203 or 612 executed by or on
behalf of the Trustee or by the Authenticating Agent by the manual signature of
one of its authorized officers.  Such certificate upon any Security shall be
conclusive evidence, and the only evidence, that such Security has been duly
authenticated and delivered hereunder.  Except as permitted by Section 306 or
307, the Trustee shall not authenticate or deliver any Bearer Security unless
all Coupons appertaining thereto then matured have been detached and canceled.

Section 304.  Temporary Securities.
              -------------------- 

     (a) Pending the preparation of Definitive Securities, the Company may
execute and deliver to the Trustee and, upon Company Order for authentication
and delivery, the Trustee shall authenticate and deliver, in the manner provided
in Section 303, temporary Securities in lieu thereof which are printed,
lithographed, typewritten, mimeographed or otherwise produced, in any authorized
denomination, substantially of the tenor of the Definitive Securities in lieu of
which they are issued, in registered form or, if authorized in or pursuant to
this Indenture, in bearer form with one or more Coupons or without Coupons, with
such appropriate insertions, omissions, substitutions and other variations as
the officers executing such Securities may determine, as conclusively evidenced
by their execution of such Securities.  Such temporary Securities may be in
global form.

     (b) Except in the case of temporary global Bearer Securities, which shall
be exchanged in accordance with the provisions of clause (c) of this Section
304, if temporary Securities are issued, the Company shall cause Definitive
Securities to be prepared without unreasonable delay. After the preparation of
Definitive Securities of the same series and containing terms and provisions
that are identical to those of any temporary Securities, such temporary
Securities shall be exchangeable for such Definitive Securities upon surrender
of such temporary Securities at an Office or Agency for such Securities, without
charge to any Holder thereof.  Upon surrender for cancellation of any one or
more temporary Securities (accompanied by any unmatured Coupons appertaining
thereto), the Company shall execute and the Trustee shall authenticate and
deliver in exchange therefor a like principal amount of Definitive Securities of
authorized denominations of the same series and containing identical terms and
provisions; provided, however, that no definitive Bearer Security, except as
            --------  -------                                               
provided in or pursuant to this Indenture, shall be delivered in exchange for a
temporary Registered Security; and provided, further, that a definitive Bearer
                                   --------  -------                          
Security shall be delivered in exchange for a temporary global Bearer Security
only in compliance with the conditions set forth in or pursuant to this
Indenture.  Unless otherwise provided in or pursuant to this Indenture with
respect to a temporary global Bearer Security, until so exchanged the temporary
Securities of any series shall 

                                      -26-
<PAGE>
 
in all respects be entitled to the same benefits under this Indenture as
Definitive Securities of such series.

     (c) All or a portion of the Securities constituting Bearer Securities may
be initially issued as temporary global Bearer Securities without Coupons or
conversion rights. Such temporary global Bearer Securities shall be deposited on
the applicable closing date on behalf of the subscribers for the Securities
represented thereby with the Common Depository, for credit to their respective
accounts (or to such other accounts as they may direct) at MORGAN GUARANTY TRUST
COMPANY OF New York, Brussels Office, as operator of the Euroclear Clearance
System ("Euroclear"), or Cedel Bank, Societe Anonyme ("Cedel").

     On or before the Exchange Date, the Company shall deliver to the Paying
Agent in London at its principal London office or to its designated agent
outside the United States, definitive Bearer Securities.  On or after the
applicable Exchange Date, the temporary global Bearer Securities may be
surrendered by the Common Depository to the Trustee, to be exchanged, in whole
or from time to time in part, for definitive Bearer Securities without charge to
Holders, and the Trustee or the Paying Agent in London or other Paying Agent
outside the United States shall authenticate and deliver (at an office or agency
outside the United States), in exchange for the temporary global Bearer
Securities or the portions thereof to be exchanged, an equal aggregate principal
amount of definitive Bearer Securities, as shall be specified by the holders
thereof; provided, however, that upon such presentation by the Common
         --------  ------- 
Depository, the temporary global Bearer Securities are accompanied by a
certificate dated the Exchange Date or a subsequent date and signed by Euroclear
as to the portion of the temporary global Bearer Securities held for its account
then to be exchanged and a certificate dated the Exchange Date or a subsequent
date and signed by Cedel as to the portion of the temporary global Bearer
Securities held for its account then to be exchanged, each substantially in the
form of Exhibit D hereto to the effect that it has received a certificate or
        ---------                                                           
certificates substantially in the form of Exhibit C hereto dated no earlier than
                                          ---------                             
15 days prior to the Exchange Date and signed by the person appearing in its
records as the owner of the temporary global Bearer Securities or portions
thereof being exchanged.  The Company hereby appoints the principal office of
the Paying Agent in London, England, or its designated agent, as its agent
outside the United States where definitive Bearer Securities may be delivered in
exchange for the temporary global Bearer Securities or portions thereof.  Each
beneficial owner of any portion of the temporary global Bearer Securities shall
be entitled to take delivery of definitive Bearer Securities only at such
office.  Upon the exchange of the temporary global Bearer Security in whole for
definitive Bearer Securities or for Registered Securities (if permitted by the
rules and procedures then in effect of Cedel and Euroclear), the temporary
global Bearer Security shall be canceled in accordance with Section 309 of this
Indenture.

     Temporary global Bearer Securities will be exchangeable for Registered
Securities in denominations of $1,000 or an integral multiple thereof at any
time without the certification requirements set forth in the preceding
paragraph; provided that such exchange is permitted by the rules and procedures
           -------- ----                                                       
then in effect of Cedel and Euroclear, and provided, further, that if and so
                                           --------- -------                
long as Registered Securities of a series are represented solely by a permanent
global Registered Security, the temporary global Bearer Security will only be
exchangeable for an interest in the permanent global Registered Security as set
forth in Section 305 herein.

                                      -27-
<PAGE>
 
     Notwithstanding any other provision hereof or of the Securities, no Bearer
Security initially represented by a temporary global Bearer Security will be
mailed to or otherwise delivered in connection with its original issuance to any
location within the United States.  The Trustee agrees that it will cause the
Paying Agent in London (if any) to retain each certificate provided by Euroclear
or Cedel for a period of four calendar years following the year in which the
certificate is received and not to destroy or otherwise dispose of any such
certificate without first offering to deliver it to the Company.

     Upon any such exchange of a portion of the temporary global Bearer Security
for definitive Bearer Securities or for Registered Securities (if permitted by
the rules and procedures then in effect of Cedel and Euroclear), the existing
temporary global Bearer Security shall be canceled by the Trustee in accordance
with Section 309 of this Indenture.  The Company shall deliver to the Trustee
for authentication, and the Trustee shall authenticate and deliver (at an office
or agency located outside the United States), a temporary global Bearer Security
representing the portion of the temporary global Bearer Security not so
exchanged.  Until so exchanged in full, the temporary global Bearer Security
shall in all respects be entitled to the same benefits under, and subject to the
same terms and conditions of, this Indenture as definitive Bearer Securities
authenticated and delivered hereunder, except that none of Euroclear, Cedel or
the beneficial owners of the temporary global Bearer Security shall be entitled
to receive payment of interest or other payments thereon or to convert the
temporary Global Bearer Security, if applicable, or any portion thereof, as set
forth in Article Twelve, except as otherwise permitted pursuant to this
indenture or the Securities.

SECTION 305.  REGISTRATION, TRANSFER AND EXCHANGE.
              ----------------------------------- 

     With respect to the Registered Securities of each series, if any, the
Company shall cause to be kept a register (each such register being herein
sometimes referred to as the "Security Register") at an Office or Agency for
                              -----------------                             
such series in which, subject to such reasonable regulations as it may
prescribe, the Company shall provide for the registration of the Registered
Securities of such series and of transfers of the Registered Securities of such
series. Such Office or Agency shall be the "Security Registrar" for that series
                                            ------------------                 
of Securities.  Unless otherwise specified in or pursuant to this Indenture or
the Securities, the Trustee shall be the initial Security Registrar for each
series of Securities.  The Company shall have the right to remove and replace
from time to time the Security Registrar for any series of Securities; provided
                                                                       --------
that no such removal or replacement shall be effective until a successor
- ----                                                                    
Security Registrar with respect to such series of Securities shall have been
appointed by the Company and shall have accepted such appointment.  In the event
that the Trustee shall not be or shall cease to be Security Registrar with
respect to a series of Securities, it shall have the right to examine the
Security Register for such series at all reasonable times.  There shall be only
one Security Register for each series of Securities.

     Upon surrender for registration of transfer of any Registered Security of
any series at any Office or Agency for such series, the Company shall execute,
and the Trustee shall authenticate and deliver, in the name of the designated
transferee or transferees, one or more new Registered Securities of the same
series denominated as authorized in or pursuant to this Indenture, of a like

                                      -28-
<PAGE>
 
aggregate principal amount bearing a number not contemporaneously outstanding
and containing identical terms and provisions.

     At the option of the Holder, Registered Securities of any series may be
exchanged for other Registered Securities of the same series containing
identical terms and provisions, in any authorized denominations, and of a like
aggregate principal amount, upon surrender for cancellation of the Securities to
be exchanged at any applicable Office or Agency for such series. Whenever any
Registered Securities are so surrendered for exchange, the Company shall
execute, and the Trustee shall authenticate and deliver, the Registered
Securities which the Holder making the exchange is entitled to receive.
Registered Securities of any series may not be exchanged for Bearer Securities.

     At the option of the Holder, definitive Bearer Securities of such series
may be exchanged at any time (except as otherwise provided in this Indenture)
for Registered Securities or Bearer Securities of such series containing
identical terms, denominated as authorized in or pursuant to this Indenture and
in the same aggregate principal amount, upon surrender for cancellation of the
Bearer Securities to be exchanged at any applicable Office or Agency for such
series located outside the United States, with any and all unmatured Coupons and
any and all matured Coupons in default thereto appertaining; provided that if
                                                             -------- ----   
and so long as Registered Securities of a series are represented solely by a
permanent global Registered Security, such definitive Bearer Securities will
only be exchangeable for an interest in the permanent global Registered Security
as set forth in this Section 305.  If the Holder of a Bearer Security is unable
to produce any such unmatured Coupon or Coupons or matured Coupon or Coupons in
default, such exchange may be effected if the Bearer Securities are accompanied
by payment in funds acceptable to the Company and the Trustee in an amount equal
to the face amount of such missing Coupon or Coupons, or the surrender of such
missing Coupon or Coupons may be waived by the Company and the Trustee if there
is furnished to them such security or indemnity as they may require to save each
of them and any Paying Agent harmless.  If thereafter the Holder of such Bearer
Security shall surrender to any Paying Agent any such missing Coupon in respect
of which such a payment shall have been made, such Holder shall be entitled to
receive the amount of such payment; provided, however, that, except as otherwise
                                    --------  -------                           
provided in Section 1002, interest represented by Coupons shall be payable only
upon presentation and surrender of those Coupons at an applicable Office or
Agency for such series located outside the United States.  Notwithstanding the
foregoing, in case a Bearer Security of any series is surrendered at any such
Office or Agency for such series in exchange for a Registered Security of such
series and like tenor after the close of business at such Office or Agency on
(i) any Regular Record Date and before the opening of business at such Office or
Agency on the relevant Interest Payment Date, or (ii) any Special Record Date
and before the opening of business at such Office or Agency on the related date
for payment of Defaulted Interest, such Bearer Security shall be surrendered
without the Coupon relating to such Interest Payment Date or proposed date for
payment of Defaulted Interest, as the case may be (or, if such Coupon is so
surrendered with such Bearer Security, such Coupon shall be returned to the
Person so surrendering the Bearer Security), and interest or Defaulted Interest,
as the case may be, shall not be payable on such Interest Payment Date or
proposed date for payment of Defaulted Interest, as the case may be, in respect
of the Registered Security issued in exchange for such Bearer Security, but
shall be payable only to the Holder of such Coupon when due in accordance with
the provisions of this Indenture.

                                      -29-
<PAGE>
 
     Whenever any Securities are surrendered for exchange as contemplated by the
immediately preceding two paragraphs, the Company shall execute, and the Trustee
shall authenticate and deliver, the Securities (with all Coupons, in the case of
the issuance of Bearer Securities), which the Holder making the exchange is
entitled to receive.

     If the Holder of definitive Bearer Securities or definitive Registered
Securities requests in writing that such Securities be exchanged for an interest
in the applicable permanent global Registered Security, such Bearer Securities
or Registered Securities (as the case may be) will be exchangeable into an equal
aggregate principal amount of beneficial interest in the permanent global
Registered Security; provided that in the case of definitive Bearer Securities,
                     -------- ----                                             
such Bearer Securities are only exchanged in the manner set forth in this
Section 305 with respect to the exchange of definitive Bearer Securities for
Registered Securities and in the case of Registered Securities, such exchange is
made in accordance with the rules and procedures then in effect of the
Depository.  Upon any exchange as provided in the immediately preceding
sentence, the Trustee shall cancel such Bearer Securities or Registered
Securities (as the case may be) and cause, or direct any custodian for the
permanent global Registered Security to cause, in accordance with the standing
instructions and procedures existing between the Depository and any such
custodian, the aggregate principal amount of Securities represented by the
permanent global Registered Security to be increased accordingly.  If no
permanent global Registered Securities are then outstanding, the Company shall
issue and the Trustee shall authenticate a new permanent global Registered
Security in the appropriate principal amount.

     Notwithstanding the foregoing, except as otherwise provided in or pursuant
to this Indenture, any permanent global Registered Security shall be
exchangeable for Definitive Securities in registered form only if (i) the
Depository is at any time unwilling, unable or ineligible to continue as
Depository or ceases to be a clearing agency registered under the Exchange Act
(if so required by applicable law or regulation) and a successor depository is
not appointed by the Company within 90 days of the date the Company is so
informed in writing, (ii) the Company executes and delivers to the Trustee a
Company Order to the effect that such permanent global Registered Security shall
be so exchangeable or (iii) an Event of Default has occurred and is continuing
with respect to the Securities.  If the beneficial owners of interests in a
permanent global Registered Security are entitled to exchange such interests for
Definitive Securities in registered form as the result of an event described in
clause (i), (ii) or (iii) of the preceding sentence, then without unnecessary
delay but in any event not later than the earliest date on which such interests
may be so exchanged, the Company shall deliver to the Trustee Definitive
Securities in such form and denominations as are required by or pursuant to this
Indenture, and of the same series, containing identical terms and in aggregate
principal amount equal to the principal amount of such permanent global
Registered Security, executed by the Company. On or after the earliest date on
which such interests may be so exchanged, such permanent global Registered
Security shall be surrendered from time to time by the U.S. Depository or such
other Depository as shall be specified in the Company Order with respect
thereto, and in accordance with instructions given to the Trustee and the U.S.
Depository or such other Depository, as the case may be (which instructions
shall be in writing but need not be contained in or accompanied by an Officers'
Certificate or be accompanied by an Opinion of Counsel), as shall be specified
in the Company Order with respect thereto to the Trustee, as the 

                                      -30-
<PAGE>
 
Company's agent for such purpose, to be exchanged, in whole or in part, for
Definitive Securities as described above without charge. The Trustee shall
authenticate and make available for delivery, in exchange for each portion of
such surrendered permanent global Registered Security, a like aggregate
principal amount of Definitive Securities of the same series of authorized
denominations and of like tenor as the portion of such permanent global
Registered Security to be exchanged, which shall be in the form of Registered
Securities; provided, however, that no such exchanges may occur during a
            --------  -------  
period beginning at the opening of business 15 days before any selection
of Securities of the same series to be redeemed and ending at the close of
business on the day of such selection. Promptly following any such exchange in
part, a permanent global Registered Security for the portions not exchanged
shall be returned by the Trustee to such Depository or the U.S. Depository, as
the case may be, or such other Depository or U.S. Depository referred to above
in accordance with the instructions of the Company referred to above. If a
Registered Security is issued in exchange for any portion of a permanent global
Registered Security after the close of business at the applicable Office or
Agency for such Security where such exchange occurs on or after (i) any Regular
Record Date for such Security and before the opening of business at such Office
or Agency on the next Interest Payment Date, or (ii) any Special Record Date for
such Security and before the opening of business at such Office or Agency on the
related proposed date for payment of Defaulted Interest, as the case may be,
interest shall not be payable on such Interest Payment Date or proposed date for
payment of Defaulted Interest, as the case may be, in respect of such Registered
Security, but shall be payable on such Interest Payment Date or proposed date
for payment of Defaulted Interest, as the case may be, only to the Person to
whom interest in respect of such portion of such permanent global Registered
Security shall be payable in accordance with the provisions of this Indenture.

     All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt and entitling the Holders thereof to the same benefits under this Indenture
as the Securities surrendered upon such registration of transfer or exchange.

     Every Registered Security presented or surrendered for registration of
transfer or for exchange or redemption shall (if so required by the Company or
the Security Registrar for such Security) be duly endorsed, or be accompanied by
a written instrument of transfer in form satisfactory to the Company and the
Security Registrar for such Security duly executed by the Holder thereof or his
attorney duly authorized in writing.

     No service charge shall be made for any registration of transfer or
exchange, or redemption of Securities, but the Company may require payment of a
sum sufficient to cover any stamp or similar tax or other governmental charge
and any other expenses (including fees and expenses of the Trustee) that may be
imposed in connection with any registration of transfer or exchange of
Securities, other than exchanges pursuant to Section 304, 905, 1107 or 1202, or
upon repayment in part of any Registered Security pursuant to Article Fifteen,
in each case not involving any transfer.

     Except as otherwise provided in or pursuant to this Indenture, the Company
shall not be required (i) to issue, register the transfer of or exchange any
Securities during a period beginning at the opening of business 15 days before
the day of the selection for redemption of Securities of 

                                      -31-
<PAGE>
 
like tenor and the same series under Section 1103 and ending at the close of
business on the day of such selection, or (ii) to register the transfer of or
exchange any Registered Security so selected for redemption in whole or in part,
except in the case of any Security to be redeemed in part, the portion thereof
not to be redeemed, or (iii) to exchange any Bearer Security so selected for
redemption except, to the extent provided with respect to such Bearer Security,
that such Bearer Security may be exchanged for a Registered Security of like
tenor and the same series, provided that such Registered Security shall be
immediately surrendered for redemption with written instruction for payment
consistent with the provisions of this Indenture or (iv) to issue, register the
transfer of or exchange any Security which, in accordance with its terms, has
been surrendered for repayment at the option of the Holder, except the portion,
if any, of such Security not to be so repaid.

Section 306.  Mutilated, Destroyed, Lost and Stolen Securities.
              ------------------------------------------------ 

     If any mutilated Security or a Security with a mutilated Coupon
appertaining to it is surrendered to the Trustee, subject to the provisions of
this Section 306, the Company shall execute and the Trustee shall authenticate
and deliver in exchange therefor a new Security of the same series containing
identical terms and of like principal amount and bearing a number not
contemporaneously outstanding, with Coupons appertaining thereto corresponding
to the Coupons, if any, appertaining to the surrendered Security; provided,
                                                                  -------- 
however, that any Bearer Security or any Coupon shall be delivered only outside
- -------                                                                        
the United States and, if the Securities of such series are listed on the London
Stock Exchange or the Luxembourg Stock Exchange or any other stock exchange
located outside the United States and such stock exchange shall so require, such
delivery shall occur at the Office or Agency located in London, Luxembourg or
any other required city located outside the United States, as the case may be,
so long as Securities of such series are listed on such exchange; and provided,
                                                                      -------- 
further, that all Bearer Securities shall be delivered and received in person.
- -------                                                                       

     If there be delivered to the Company and the Trustee (i) evidence to their
satisfaction of the destruction, loss or theft of any Security or Coupon, and
(ii) such security or indemnity as may be required by them to save each of them
and any agent of either of them harmless, then, in the absence of notice to the
Company or the Trustee that such Security or Coupon has been acquired by a bona
fide purchaser, the Company shall execute and, upon the Company's request the
Trustee shall authenticate and deliver, in exchange for or in lieu of any such
mutilated, destroyed, lost or stolen Security or in exchange for the Security to
which a destroyed, lost or stolen Coupon appertains with all appurtenant Coupons
not destroyed, lost or stolen, a new Security of the same series containing
identical terms and of like principal amount and bearing a number not
contemporaneously outstanding, with Coupons corresponding to the Coupons, if
any, appertaining to such destroyed, lost or stolen Security or to the Security
to which such destroyed, lost or stolen Coupon appertains; provided, however,
                                                           --------  ------- 
that any Bearer Security or any Coupon shall be delivered only outside the
United States and, if the Securities of such series are listed on the London
Stock Exchange or the Luxembourg Stock Exchange or any other stock exchange
located outside the United States and such stock exchange shall so require, such
delivery shall occur at the Office or Agency located in London, Luxembourg or
any other required city located outside the United States, as the case may be,
so long as Securities of such series are listed on 

                                      -32-
<PAGE>
 
such exchange; and provided, further, that all Bearer Securities shall be 
                   --------  -------            
delivered and received in person.

     Notwithstanding the foregoing provisions of this Section 306, in case any
mutilated, destroyed, lost or stolen Security or Coupon has become or will
become due and payable within seven (7) days, the Company in its discretion, but
subject to any conversion rights, may, instead of issuing a new Security, pay
such Security or Coupon; provided, however, that payment of principal of, any
                         --------  -------                                   
premium or interest on or any Additional Amounts with respect to any Bearer
Securities shall, except as otherwise provided in Section 1002, be payable only
at the applicable Office or Agency for such Securities located outside the
United States and, unless otherwise provided in or pursuant to this Indenture,
any interest on Bearer Securities and any Additional Amounts with respect to
such interest shall be payable only upon presentation and surrender of the
Coupons appertaining thereto.

     Upon the issuance of any new Security under this Section, the Company may
require the payment of a sum sufficient to cover any stamp or similar tax or
other governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Trustee) connected therewith.

     Every new Security with any Coupons appertaining thereto issued pursuant to
this Section 306 in lieu of any mutilated, destroyed, lost or stolen Security,
or in exchange for a Security to which a mutilated, destroyed, lost or stolen
Coupon appertains shall constitute a separate obligation of the Company, whether
or not the mutilated, destroyed, lost or stolen Security and Coupons
appertaining thereto or the mutilated, destroyed, lost or stolen Coupon shall be
at any time enforceable by anyone, and shall be entitled to all the benefits of
this Indenture equally and proportionately with any and all other Securities of
such series and any Coupons duly issued hereunder.

     The provisions of this Section, as amended or supplemented pursuant to this
Indenture with respect to particular Securities or generally, shall be exclusive
and shall preclude (to the extent lawful) all other rights and remedies with
respect to the replacement or payment of mutilated, destroyed, lost or stolen
Securities or Coupons.

Section 307.  Payment of Interest and Certain Additional Amounts; Rights to
              -------------------------------------------------------------
Interest and Certain Additional Amounts Preserved.
- ------------------------------------------------- 

     (a) Unless otherwise provided in or pursuant to this Indenture, any
interest on and any Additional Amounts with respect to any Registered Security
which shall be payable, and are punctually paid or duly provided for, on any
Interest Payment Date shall be paid to the Person in whose name such Security
(or one or more Predecessor Securities) is registered as of the close of
business on the Regular Record Date for such interest.

     Unless otherwise provided as contemplated by Section 301 with respect to
the Securities of any series, payment of interest may be made (i) by check
mailed or delivered, in the case of Registered Securities, to the address of the
Person entitled thereto as such address shall appear in the Security Register
or, in the case of Bearer Securities, upon presentation and surrender of the

                                      -33-
<PAGE>
 
appropriate Coupon appertaining thereto, or (ii) at the option of the Company
with the consent of any Paying Agent, (1) in the case of a Bearer Security, upon
presentation and surrender of the applicable Coupon at an applicable Office or
Agency for such series outside the United States, except as otherwise provided
in Section 1002, by transfer to an account maintained by the payee with a bank
located outside the United States, or (2) in the case of a Registered Security,
by transfer to an account maintained by the payee with a bank located inside the
United States.

     Unless otherwise provided in or pursuant to this Indenture, in case a
Bearer Security is surrendered in exchange for a Registered Security after the
close of business at the applicable Office or Agency for such Security on any
Regular Record Date therefor and before the opening of business at such Office
or Agency on the next succeeding Interest Payment Date therefor, such Bearer
Security shall be surrendered without the Coupon relating to such Interest
Payment Date and interest shall not be payable on such Interest Payment Date in
respect of the Registered Security issued in exchange for such Bearer Security,
but shall be payable only to the Holder of such Coupon when due in accordance
with the provisions of this Indenture.

     Unless otherwise provided in or pursuant to this Indenture, any interest on
and any Additional Amounts with respect to any Bearer Security shall, except as
otherwise provided in Section 1002, be payable only at an Office or Agency for
such Securities located outside the United States.

     Interest on any temporary global Bearer Security shall be payable only
after the issuance of a Definitive Security for which it is exchangeable as
provided in Section 304, except as otherwise provided pursuant to this Indenture
or the Securities.

     (b) Unless otherwise provided in or pursuant to this Indenture, any
interest on and any Additional Amounts with respect to any Registered Security
which shall be payable, but shall not be punctually paid or duly provided for,
on any Interest Payment Date for such Registered Security (herein called
"Defaulted Interest") shall forthwith cease to be payable to the Holder thereof
- -------------------                                                            
on the relevant Regular Record Date by virtue of having been such Holder; and
such Defaulted Interest may be paid by the Company, at its election in each
case, as provided in Clause (1) or (2) below:

     (1) The Company may elect to make payment of any Defaulted Interest to the
Person in whose name such Registered Security (or a Predecessor Security
thereof) shall be registered at the close of business on a Special Record Date
for the payment of such Defaulted Interest, which shall be fixed in the
following manner.  The Company shall notify the Trustee in writing of the amount
of Defaulted Interest proposed to be paid on such Registered Security and the
date of the proposed payment, and at the same time the Company shall deposit
with the Trustee an amount of money equal to the aggregate amount proposed to be
paid in respect of such Defaulted Interest or shall make arrangements
satisfactory to the Trustee for such deposit on or prior to the date of the
proposed payment, such money when so deposited to be held in trust for the
benefit of the Person entitled to such Defaulted Interest as in this clause
provided. Thereupon, the Trustee shall fix a Special Record Date for the payment
of such Defaulted Interest which shall be not more than 15 days and not less
than 10 days prior to the date of the proposed payment and not less than 10 days
after receipt by the Trustee of the notice of the proposed payment. The Trustee
shall

                                      -34-
<PAGE>
 
promptly notify the Company of such Special Record Date and, in the name
and at the expense of the Company, shall cause notice of the proposed payment of
such Defaulted Interest and the Special Record Date therefor to be mailed,
first-class postage prepaid, to the Holder of such Registered Security (or a
Predecessor Security thereof) at his address as it appears in the Security
Register not less than 10 days prior to such Special Record Date.  The Trustee
may, in its discretion, in the name and at the expense of the Company cause a
similar notice to be published at least once in an Authorized Newspaper of
general circulation in the Borough of Manhattan, The City of New York, but such
publication shall not be a condition precedent to the establishment of such
Special Record Date.  Notice of the proposed payment of such Defaulted Interest
and the Special Record Date therefor having been mailed as aforesaid, such
Defaulted Interest shall be paid to the Person in whose name such Registered
Security (or a Predecessor Security thereof) shall be registered at the close of
business on such Special Record Date and shall no longer be payable pursuant to
the following clause (2). In case a Bearer Security is surrendered at the
applicable Office or Agency for such Security in exchange for a Registered
Security after the close of business at such Office or Agency on any Special
Record Date and before the opening of business at such Office or Agency on the
related proposed date for payment of Defaulted Interest, such Bearer Security
shall be surrendered without the Coupon relating to such Defaulted Interest and
Defaulted Interest shall not be payable on such proposed date of payment in
respect of the Registered Security issued in exchange for such Bearer Security,
but shall be payable only to the Holder of such Coupon when due in accordance
with the provisions of this Indenture.

     (2) The Company may make payment of any Defaulted Interest in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which such Security may be listed, and upon such notice as may be required by
such exchange, if, after notice given by the Company to the Trustee of the
proposed payment pursuant to this clause, such manner of payment shall be deemed
practicable by the Trustee.

     (c) In the case of any Registered Security which is converted into Common
Stock pursuant to Article Twelve after any Regular Record Date and on or prior
to the next succeeding Interest Payment Date (other than any Registered Security
whose Maturity is prior to such Interest Payment Date), interest whose Stated
Maturity is on such Interest Payment Date shall be payable on such Interest
Payment Date notwithstanding such conversion, and such interest (whether or not
punctually paid or duly provided for) shall be paid to the Person in whose name
such Registered Security (or one or more Predecessor Securities) is registered
at the close of business on such Regular Record Date.  Except as otherwise
expressly provided in the immediately preceding sentence, in the case of any
Security which is converted pursuant to Article Twelve, accrued interest from
the immediately preceding Interest Payment Date until the Conversion Date shall
be payable to the converting Holder within five Business Days after the
Conversion Date.  Upon presentment for conversion of any Securities pursuant to
Article Twelve, the Paying Agent shall promptly notify the Company of the amount
of any accrued interest due and owing thereon and the Company shall pay to the
Paying Agent an amount sufficient to pay the accrued interest due on such
Securities and Additional Amounts, if any, thereon, and the Paying Agent shall
apply the amounts so paid to it to the payment of such accrued interest and
Additional Amounts, if any, thereon in accordance with the terms of the
Securities.

                                      -35-
<PAGE>
 
     (d) Subject to the foregoing provisions of this Section 307 and Section
305, each Security delivered under this Indenture upon registration of transfer
of or in exchange for or in lieu of any other Security shall carry the rights to
interest accrued and unpaid, and to accrue, which were carried by such other
Security.

Section 308.  Persons Deemed Owners.
              --------------------- 

     Title to any Bearer Security or Coupon shall pass by delivery.  The
Company,  the Trustee, the Paying Agent and any other agent of the Company, the
Trustee or the Paying Agent may treat the bearer of any Bearer Security or the
temporary global Bearer Security and the bearer of any Coupon as the absolute
owner of such Security or Coupon, as the case may be, for the purpose of
receiving payment thereof or on account thereof and for all other purposes
whatsoever, whether or not such Security or Coupon be overdue, and neither the
Company the Trustee, the Paying Agent nor any other agent of the Company,  the
Trustee or the Paying Agent shall be affected by notice to the contrary.

     Prior to due presentment of a Registered Security for registration of
transfer, the Company,  the Trustee and any agent of the Company or the Trustee
shall treat the Person in whose name such Registered Security is registered in
the Security Register as the absolute owner of such Registered Security for the
purpose of receiving payment of principal of, any premium and (subject to
Sections 305 and 307) interest on and any Additional Amounts with respect to
such Registered Security and for all other purposes whatsoever, whether or not
any payment with respect to such Registered Security shall be overdue, and
neither the Company, the Trustee or any agent of the Company or the Trustee
shall be affected by notice to the contrary.

     No holder of any beneficial interest in any global Security held on its
behalf by a Depository or Common Depository shall have any rights under this
Indenture with respect to such global Security, and such Depository or Common
Depository may be treated by the Company,  the Trustee, and any agent of the
Company or the Trustee as the owner of such global Security for all purposes
whatsoever.  None of the Company, the Trustee, any Paying Agent, any Conversion
Agent or the Security Registrar will have any responsibility or liability for
any aspect of the records relating to or payments made on account of beneficial
ownership interests of a global Security or for maintaining, supervising or
reviewing any records relating to such beneficial ownership interests.

Section 309.  Cancellation.
              ------------ 

     All Securities and Coupons surrendered for payment, redemption,
registration of transfer, exchange or conversion or for credit against any
sinking fund payment shall, if surrendered to any Person other than the Trustee,
be delivered to the Trustee, and any such Securities and Coupons, as well as
Securities and Coupons surrendered directly to the Trustee for any such purpose,
shall be canceled promptly by the Trustee.  The Company may at any time deliver
to the Trustee for cancellation any Securities or Coupons previously
authenticated and delivered hereunder which the Company may have acquired in any
manner whatsoever, and all Securities or Coupons so delivered shall be canceled
promptly by the Trustee. No Securities or Coupons

                                      -36-
<PAGE>
 
shall be authenticated in lieu of or in exchange for any Securities or Coupons
canceled as provided in this Section 309, except as expressly permitted by or
pursuant to this Indenture. All canceled Securities and Coupons held by the
Trustee shall be destroyed by the Trustee, unless by a Company Order the Company
directs their return to it.

Section 310.  Computation of Interest.
              ----------------------- 

     Except as otherwise provided in or pursuant to this Indenture or in the
Securities of any series, interest on the Securities shall be computed on the
basis of a 360-day year of twelve 30-day months.

Section 311.  CUSIP Numbers.
              ------------- 

     The Company in issuing Registered Securities may use "CUSIP" numbers (if
then generally in use) in addition to serial numbers, and in issuing Bearer
Securities may use "ISIN" numbers (if then generally in use); if so, the Trustee
shall use such "CUSIP" and "ISIN" numbers in addition to serial numbers in
notices of redemption and repayment as a convenience to Holders; provided that
                                                                 -------- ----
any such notice may state that no representation is made as to the correctness
of such CUSIP and ISIN numbers either as printed on the Securities or as
contained in any notice of a redemption or repayment and that reliance may be
placed only on the serial or other identification numbers printed on the
Securities, and any such redemption or repayment shall not be affected by any
defect in or omission of such CUSIP or ISIN numbers.

Section 312.  Notification of Withholding.
              --------------------------- 

The Company shall notify the Trustee in writing of the necessity, if any, to
withhold any amounts from payments to Holders (and the amount of any such
withholding).

                                  ARTICLE FOUR

                    SATISFACTION AND DISCHARGE OF INDENTURE

Section 401.  Satisfaction and Discharge.
              -------------------------- 

     Upon the direction of the Company by a Company Order, this Indenture shall
cease to be of further effect with respect to any series of Securities specified
in such Company Order and any Coupons appertaining thereto (except as to any
surviving rights of conversion, or registration of transfer or exchange or
replacement of Securities herein expressly provided for and any right to receive
Additional Amounts and the Company's obligations to the Trustee pursuant to
Section 606), and the Trustee, on receipt of a Company Order, at the expense of
the Company, shall execute proper instruments acknowledging satisfaction and
discharge of this Indenture as to such series, when

                                      -37-
<PAGE>
 
     (1)  either

          (A) all Securities of such series theretofore authenticated and
     delivered and all Coupons appertaining thereto (other than (i) Coupons
     appertaining to Bearer Securities of such series surrendered in exchange
     for Registered Securities of such series and maturing after such exchange
     whose surrender is not required or has been waived as provided in Section
     305, (ii) Securities and Coupons of such series which have been destroyed,
     lost or stolen and which have been replaced or paid as provided in Section
     306, (iii) Coupons appertaining to Securities of such series called for
     redemption and maturing after the relevant Redemption Date whose surrender
     has been waived as provided in Section 1106, and (iv) Securities and
     Coupons of such series for whose payment money has theretofore been
     deposited in trust or segregated and held in trust by the Company and
     thereafter repaid to the Company or discharged from such trust, as provided
     in Section 1003) have been delivered to the Trustee for cancellation; or

          (B) all Securities of such series and any Coupons appertaining thereto
     not theretofore delivered to the Trustee or the Paying Agent for
     cancellation (other than Securities or Coupons referred to in clauses (i)
     through (iii) of clause (A) above)

          (i)  have become due and payable, or

          (ii) will have become due and payable at their Stated Maturity within
     one year and such Securities are not convertible into or exchangeable for
     other securities, or

          (iii)  if redeemable at the option of the Company, such Securities are
     not convertible into or exchangeable for other securities and are to be
     called for redemption within one year under arrangements satisfactory to
     the Trustee for the giving of notice of redemption by the Trustee in the
     name, and at the expense, of the Company,

     and the Company, in the case of (i), (ii), or (iii) above, has irrevocably
     deposited or caused to be deposited with the Trustee as trust funds
     (immediately available to the Holders in the case of clause (i) above) in
     trust for such purpose, money in the Currency in which such Securities are
     payable in an amount sufficient to pay and discharge the entire
     indebtedness on such Securities and any Coupons appertaining thereto not
     theretofore delivered to the Trustee for cancellation, including the
     principal of, any premium and interest on, and, to the extent that the
     Securities of such series provide for the payment of Additional Amounts
     thereon and the amount of any such Additional Amounts is at the time of
     deposit reasonably determinable by the Company (in the exercise by the
     Company of its sole and absolute discretion), any Additional Amounts with
     respect to such Securities and any Coupons appertaining thereto, to the
     date of such deposit (in the case of Securities which have become due and
     payable) or to the Maturity thereof, as the case may be;

     (2) the Company has paid or caused to be paid all other sums payable
     hereunder by the Company with respect to the Outstanding Securities of such
     series and any Coupons appertaining thereto; and

                                      -38-
<PAGE>
 
     (3) the Company has delivered to the Trustee an Officers' Certificate and
     an Opinion of Counsel, each stating that all conditions precedent herein
     provided for relating to the satisfaction and discharge of this Indenture
     as to such series have been complied with.

     In the event there are Securities of two or more series hereunder, the
Trustee shall be required to execute an instrument acknowledging satisfaction
and discharge of this Indenture only if requested to do so with respect to
Securities of such series as to which it is Trustee and if the other conditions
thereto are met.

     Notwithstanding the satisfaction and discharge of this Indenture with
respect to any series of Securities, the obligations of the Company to the
Trustee under Section 606, the obligations of the Company to any Authenticating
Agent under Section 612, and, if money shall have been deposited with the
Trustee pursuant to clause (1)(B) of this Section, the obligations of the
Company and the Trustee with respect to the Securities of such series under
Sections 305, 306, 403, 1002 and 1003, and with respect to the payment of
Additional Amounts, if any, with respect to such Securities as contemplated by
Section 1004 (but only to the extent that the Additional Amounts payable with
respect to such Securities exceed the amount deposited in respect of such
Additional Amounts pursuant to Section 401(B)), shall survive.

Section 402.  Defeasance and Covenant Defeasance.
              ---------------------------------- 

     (1) Unless, pursuant to Section 301, provision is made for either or both
of (i) defeasance of the Securities of or within a series under clause (2) of
this Section 402 or (ii) covenant defeasance of the Securities of or within a
series under clause (3) of this Section 402, such provisions, together with the
other provisions of this Section 402, shall not be applicable to such Securities
and any Coupons appertaining thereto.

     (2) Upon the Company's exercise of the above option applicable to this
Section 402(2) with respect to any Securities of or within a series, the Company
shall be deemed to have been discharged from its obligations with respect to
such Outstanding Securities and any Coupons appertaining thereto on the date the
conditions set forth in clause (4) of this Section 402 are satisfied
(hereinafter, "defeasance").  For this purpose, such defeasance means that the
               ----------                                                     
Company shall be deemed to have paid and discharged the entire indebtedness
represented by such Outstanding Securities and any Coupons appertaining thereto,
which shall thereafter be deemed to be "Outstanding" only for the purposes of
clause (5) of this Section 402 and the other Sections of this Indenture referred
to in clauses (i) and (ii) below, and to have satisfied all of its other
obligations under such Securities and any Coupons appertaining thereto and this
Indenture insofar as such Securities and any Coupons appertaining thereto are
concerned (and the Trustee, at the expense of the Company, shall execute proper
instruments acknowledging the same), except for the following which shall
survive until otherwise terminated or discharged hereunder: (i) the rights of
Holders of such Outstanding Securities and any Coupons appertaining thereto to
receive, solely from the trust fund described in clause (4) of this Section 402
and as more fully set forth in such Section, payments in respect of the
principal of (and premium, if any) and interest, if any, on, and Additional
Amounts, if any, with respect to, such Securities and any Coupons appertaining
thereto when such payments are due, (ii) the obligations of the Company 

                                      -39-
<PAGE>
 
and the Trustee with respect to such Securities under Sections 304, 305, 306,
403, 1002 and 1003, with respect to the payment of Additional Amounts, if any,
on such Securities as contemplated by Section 1004 (but only to the extent that
the Additional Amounts payable with respect to such Securities exceed the amount
deposited in respect of such Additional Amounts pursuant to Section 402(4)(a)
below), (iii) the rights, powers, trusts, duties and immunities of the Trustee
hereunder, (iv) any rights of conversion or exchange of such Securities and (v)
this Section 402. The Company may exercise its option under this Section 402(2)
notwithstanding the prior exercise of its option under clause (3) of this
Section 402 with respect to such Securities and any Coupons appertaining
thereto.

     (3) Upon the Company's exercise of the above option applicable to this
Section 402(3) with respect to any Securities of or within a series, the Company
shall be released from its obligations under Sections 1005 and Section 102 and,
to the extent specified pursuant to Section 301, any other covenant applicable
to such Securities, with respect to such Outstanding Securities and any Coupons
appertaining thereto on and after the date the conditions set forth in clause
(4) of this Section 402 are satisfied (hereinafter, "covenant defeasance"), and
                                                     -------------------       
such Securities and any Coupons appertaining thereto shall thereafter be deemed
to be not "Outstanding" for the purposes of any direction, waiver, consent or
declaration or Act of Holders (and the consequences of any thereof) in
connection with any such covenant, but shall continue to be deemed "Outstanding"
for all other purposes hereunder.  For this purpose, such covenant defeasance
means that, with respect to such Outstanding Securities and any Coupons
appertaining thereto, the Company may omit to comply with, and shall have no
liability in respect of, any term, condition or limitation set forth in any such
Section or such other covenant, whether directly or indirectly, by reason of any
reference elsewhere herein to any such Section or such other covenant or by
reason of reference in any such Section or such other covenant to any other
provision herein or in any other document and such omission to comply shall not
constitute a default or an Event of Default under Section 501(4) or otherwise,
as the case may be, but, except as specified above, the remainder of this
Indenture and such Securities and Coupons appertaining thereto, shall be
unaffected thereby.

     (4) The following shall be the conditions to application of clause (2) or
(3) of this Section 402 to any Outstanding Securities of or within a series and
any Coupons appertaining thereto:

     (a) The Company shall irrevocably have deposited or caused to be deposited
with the Trustee (or another trustee satisfying the requirements of Section 607
who shall agree to comply with the provisions of this Section 402 applicable to
it) as trust funds in trust for the purpose of making the following payments,
specifically pledged as security for, and dedicated solely to, the benefit of
the Holders of such Securities and any Coupons appertaining thereto, (i) an
amount in Dollars, or (ii) Government Obligations applicable to such Securities
and Coupons appertaining thereto (determined on the basis of the Currency in
which such Securities and Coupons appertaining thereto are then specified as
payable at Stated Maturity) which through the scheduled payment of principal and
interest in respect thereof in accordance with their terms will provide, not
later than one day before the due date of any payment of principal of (and
premium, if any) and interest, if any, on such Securities and any Coupons
appertaining thereto, money in an amount, or (iii) a combination thereof, in any
case, in an amount, sufficient, without

                                      -40-
<PAGE>
 
consideration of any reinvestment of such principal and interest, in the opinion
of a nationally recognized firm of independent public accountants expressed in a
written certification thereof delivered to the Trustee, to pay and discharge,
and which shall be applied by the Trustee (or other qualifying trustee) to pay
and discharge, (y) the principal of (and premium, if any) and interest, if any,
on, and, to the extent that such Securities provide for the payment of
Additional Amounts thereon and the amount of any such Additional Amounts is at
the time of deposit reasonably determinable by the Company, any Additional
Amounts with respect to, such Outstanding Securities and any Coupons
appertaining thereto on the Stated Maturity of such principal or installment of
principal or interest and (z) any mandatory sinking fund payments or analogous
payments applicable to such Outstanding Securities and any Coupons appertaining
thereto on the day on which such payments are due and payable in accordance with
the terms of this Indenture and of such Securities and any Coupons appertaining
thereto.

     (b) Such defeasance or covenant defeasance shall not result in a breach or
violation of, or constitute a default under, this Indenture or any other
material agreement or instrument to which the Company is a party or by which it
is bound.

     (c) No Default or Event of Default with respect to such Securities and any
Coupons appertaining thereto shall have occurred and be continuing on the date
of such deposit and, with respect to defeasance only, at any time during the
period ending on the 91st day after the date of such deposit (it being
understood that this condition shall not be deemed satisfied until the
expiration of such period).

     (d) In the case of an election under clause (2) of this Section 402, the
Company shall have delivered to the Trustee an Opinion of Counsel stating that
(i) the Company has received from the Internal Revenue Service a letter ruling,
or there has been published by the Internal Revenue Service a revenue ruling, or
(ii) since the date of execution of this Indenture, there has been a change in
the applicable Federal income tax law, in either case to the effect that, and
based thereon such opinion shall confirm that, the Holders of such Outstanding
Securities and any Coupons appertaining thereto will not recognize income, gain
or loss for Federal income tax purposes as a result of such defeasance and will
be subject to Federal income tax on the same amounts, in the same manner and at
the same times as would have been the case if such defeasance had not occurred.

     (e) In the case of an election under clause (3) of this Section 402, the
Company shall have delivered to the Trustee an Opinion of Counsel to the effect
that the Holders of such Outstanding Securities and any Coupons appertaining
thereto will not recognize income, gain or loss for Federal income tax purposes
as a result of such covenant defeasance and will be subject to Federal income
tax on the same amounts, in the same manner and at the same times as would have
been the case if such covenant defeasance had not occurred.

     (f) The Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent to the defeasance or covenant defeasance under clause (2) or (3) of
this Section 402 (as the case may be) have been complied with.

                                      -41-
<PAGE>
 
     (g) The Company shall have delivered to the Trustee an Officers'
Certificate to the effect that neither such Securities nor any other Securities
of the same series, if then listed on any securities exchange, will be delisted
as a result of such deposit.

     (h) Such defeasance or covenant defeasance shall not cause the Trustee to
have a conflicting interest within the meaning of the Trust Indenture Act
(assuming all Securities are in default within the meaning of such Act).

     (i) Such defeasance or covenant defeasance shall not result in the trust
arising from such deposit constituting an investment company within the meaning
of the Investment Company Act unless such trust shall be registered under such
Act or exempt from registration thereunder.

     (j) Notwithstanding any other provisions of this Section 402(4), such
defeasance or covenant defeasance shall be effected in compliance with any
additional or substitute terms, conditions or limitations which may be imposed
on the Company in connection therewith pursuant to Section 301.

     (5) Subject to the provisions of the last paragraph of Section 1003, all
money and Government Obligations (or other property as may be provided pursuant
to Section 301) (including the proceeds thereof) deposited with the Trustee (or
other qualifying trustee-- collectively for purposes of this Section 402(5) and
Section 403, the "Trustee") pursuant to clause (4) of Section 402 in respect of
                  -------                                                      
any Outstanding Securities of any series and any Coupons appertaining thereto
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Securities and any Coupons appertaining thereto and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Holders of such Securities and any Coupons appertaining
thereto of all sums due and to become due thereon in respect of principal (and
premium, if any) and interest and Additional Amounts, if any, but such money
need not be segregated from other funds except to the extent required by law.

     The Company shall pay and indemnify the Trustee and its officers,
directors, employees and agents against any tax, fee or other charge, imposed on
or assessed against the Government Obligations deposited pursuant to this
Section 402 or the principal or interest received in respect thereof other than
any such tax, fee or other charge which by law is for the account of the Holders
of such Outstanding Securities and any Coupons appertaining thereto.

     Anything in this Section 402 to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon Company Request any
money or Government Obligations (or other property and any proceeds therefrom)
held by it as provided in clause (4) of this Section 402 which, in the opinion
of a nationally recognized firm of independent public accountants expressed in a
written certification thereof delivered to the Trustee, are in excess of the
amount thereof which would then be required to be deposited to effect a
defeasance or covenant defeasance, as applicable, in accordance with this
Section 402.

                                      -42-
<PAGE>
 
Section 403.  Application of Trust Money.
              -------------------------- 

     Subject to the provisions of the last paragraph of Section 1003, all money
and Government Obligations deposited with the Trustee pursuant to Section 401 or
402 shall be held in trust and applied by it, in accordance with the provisions
of the Securities, the Coupons appertaining thereto, and this Indenture, as
applicable, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal, premium, interest
and Additional Amounts for whose payment such money has or Government
Obligations have been deposited with or received by the Trustee; but such money
and Government Obligations need not be segregated from other funds except to the
extent required by law.


                                  ARTICLE FIVE

                                    REMEDIES


Section 501.  Events of Default.
              ----------------- 

     "Event of Default," wherever used herein with respect to Securities of any
      ----------------                                                         
series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be effected
by operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body) unless
such event is specifically deleted or modified in or pursuant to the
supplemental indenture, a Company Board Resolution or Company Officers'
Certificate establishing the terms of such series pursuant to this Indenture:

     (1) default in the payment of any interest on, or any Additional Amounts
payable in respect of any interest on, any Security of such series when such
interest or such Additional Amounts, as the case may be, become due and payable,
and continuance of such default for a period of 10 days; or

     (2) default in the payment of the principal of or premium, if any, on, or
any Additional Amounts payable in respect of the principal of or premium, if
any, on any Security of such series when due upon Maturity (whether upon
redemption or otherwise); or

     (3) default in the payment of any sinking fund payment, or analogous
payment, when and as due by the terms of a Security of such series; or

     (4) default in the performance, or breach, of any covenant or warranty of
the Company in this Indenture or any Security of such series (other than a
covenant or warranty for which the consequences of breach or nonperformance are
addressed elsewhere in this Section 501 or in the Securities or in a covenant or
warranty which has expressly been included in this Indenture or a Security of
that series, whether or not by means of a supplemental Indenture, solely for the
benefit of Securities of a series other than such series), and continuance

                                      -43-
<PAGE>
 
of such default or breach for a period of 60 days after there has been given, by
registered or certified mail, to the Company by the Trustee or to the Company
and the Trustee by the Holders of at least 25% in principal amount of the
Outstanding Securities of such series a written notice specifying such default
or breach and requiring it to be remedied and stating that such notice is a
"Notice of Default" hereunder; or

     (5) the Company pursuant to or under or within the meaning of any
Bankruptcy Law:

          (a) commences a voluntary case or proceeding;

          (b) consents to the entry of an order for relief against it in an
     involuntary case or proceeding or the commencement of any case against it;

          (c) consents to the appointment of a Custodian of it or for any
     substantial part of its property;

          (d) makes a general assignment for the benefit of its creditors;

          (e) files a petition in bankruptcy or answer or consent seeking
     reorganization or relief; or

          (f) consents to the filing of such petition or the appointment of or
     taking possession by a Custodian; or

     (6) a court of competent jurisdiction enters an order or decree under any
Bankruptcy Law that:

          (a) is for relief against the Company in an involuntary case or
     proceeding, or adjudicates the Company insolvent or bankrupt;

          (b) appoints a Custodian of the Company or for any substantial part of
     their respective property; or

          (c) orders the winding up or liquidation of the Company;

          and the order or decree remains unstayed and in effect for 60
     consecutive days; or

     (7)  a default by the Company (including a default with respect to
Securities of any series other than that series) under any indenture, including
this Indenture, or instrument evidencing, or under which the Company has at the
date of this Indenture or shall hereafter have, any indebtedness for money
borrowed with a principal amount then outstanding in excess of $25,000,000 or
such other amount as may be specified in the Company's Board Resolutions or
Officers' Certificate establishing the series (or the equivalent in any other
currency) shall happen and be continuing and such indebtedness shall have been
accelerated so that the same shall be or become due and payable prior to the
date on which the same would otherwise have become due and payable, or a default
in payment of such indebtedness at its stated maturity shall have

                                      -44-
<PAGE>
 
occurred, and such indebtedness shall not have been discharged or such
acceleration shall not be rescinded or annulled within 20 days after written
notice thereof shall have been given, by registered or certified mail, to the
Company by the Trustee, or to the Company and the Trustee by the Holders of at
least 25% in aggregate principal amount of the Outstanding Securities of that
series; provided, however, that if such default under such indenture or
        --------  -------
instrument shall be remedied or cured by the Company or waived by the holders of
such indebtedness, then the Event of Default hereunder by reason thereof shall
be deemed likewise to have been thereupon remedied, cured or waived without
further action upon the part of either the Trustee or any of the Holders;
provided, further, however, that subject to the provisions of Section 601, the
- --------  -------
Trustee will not be considered to have knowledge of any default by the Company
under this Section 501 unless the Trustee shall have received written or actual
notice of such default; or

     (8) any other Event of Default provided in or pursuant to this Indenture
with respect to Securities of such series.

     "Bankruptcy Law" means Title 11, United States Code, or any similar Federal
      --------------                                                            
or state law for the relief of debtors.  "Custodian" means any receiver,
                                          ---------                     
trustee, assignee, liquidator, sequestrator, custodian or similar official under
any Bankruptcy Law.

Section 502.  Acceleration of Maturity; Rescission and Annulment.
              -------------------------------------------------- 

     If an Event of Default with respect to Securities of any series at the time
Outstanding occurs and is continuing throughout the period permitted under this
Indenture or any supplemental indenture to cure such default, then the Trustee
or the Holders of not less than 25% in principal amount of the Outstanding
Securities of such series may declare the principal (or, if any Securities are
Original Issue Discount Securities or Indexed Securities, such portion of the
principal as may be specified in the terms thereof) of all the Securities of
such series, or such lesser amount as may be provided for in the Securities of
such series, to be due and payable immediately, by a notice in writing to the
Company (and to the Trustee if given by the Holders), and upon any such
declaration such principal or such lesser amount shall become immediately due
and payable.

     Notwithstanding any other provision of this Section 502, if an Event of
Default specified in Section 501(5) or 501(6) occurs, all principal of, any
premium and interest on, and any Additional Amounts on the Securities then
Outstanding shall be immediately due and payable without any declaration or
other act on the part of the Trustee or the Holders.

     At any time after Securities of any series have been accelerated and before
a judgment or decree for payment of the money due has been obtained by the
Trustee as hereinafter in this Article Five provided, the Holders of not less
than a majority in principal amount of the Outstanding Securities of such
series, by written notice to the Company and the Trustee, may rescind and annul
such declaration and its consequences if:

     (1) the Company has paid or deposited with the Trustee a sum of money
sufficient to pay

                                      -45-
<PAGE>
 
     (a) all overdue installments of any interest on any Securities of such
series and any Coupons appertaining thereto and any Additional Amounts with
respect thereto,

     (b) the principal of and any premium on any Securities of such series which
have become due otherwise than by such declaration of acceleration and any
Additional Amounts with respect thereto and, to the extent the payment of such
interest is lawful, interest thereon at the rate or rates borne by or provided
for in such Securities,

     (c) to the extent that payment of such interest is lawful, interest upon
overdue installments of any interest and any Additional Amounts with respect
thereto at the rate or rates borne by or provided for in such Securities, and

     (d) all sums paid or advanced by the Trustee hereunder and the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel and all other amounts due the Trustee under Section 606; and

     (2)  all Events of Default with respect to Securities of such series, other
than the non-payment of the principal of, any premium and interest on, and any
Additional Amounts with respect to Securities of such series which shall have
become due solely by such declaration of acceleration, shall have been cured or
waived as provided in Section 513.

     No such rescission shall affect any subsequent default or impair any right
consequent thereon.

Section 503.  Collection of Indebtedness and Suits for Enforcement by Trustee.
              --------------------------------------------------------------- 

     The Company covenants that if

     (1) default is made in the payment of any installment of interest on or any
Additional Amounts with respect to any Security or any Coupon appertaining
thereto when such interest or Additional Amounts shall have become due and
payable and such default continues for a period of 10 days, or

     (2) default is made in the payment of the principal of or any premium on
any Security at its Maturity,

the Company shall, upon demand of the Trustee, pay to the Trustee, for the
benefit of the Holders of such Securities and any Coupons appertaining thereto,
the whole amount of money then due and payable with respect to such Securities
and any Coupons appertaining thereto, with interest upon the overdue principal,
any premium and, to the extent that payment of such interest shall be legally
enforceable, upon any overdue installments of interest and Additional Amounts at
the rate or rates borne by or provided for in such Securities, and, in addition
thereto, such further amount of money as shall be sufficient to cover the costs
and expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel and all other
amounts due to the Trustee under Section 606.

                                      -46-
<PAGE>
 
     If the Company fails to pay the money it is required to pay the Trustee
pursuant to the preceding paragraph, forthwith upon the demand of the Trustee,
the Trustee, in its own name and as trustee of an express trust, may institute a
judicial proceeding for the collection of the money so due and unpaid, and may
prosecute such proceeding to judgment or final decree, and may enforce the same
against the Company or any other obligor upon such Securities and any Coupons
appertaining thereto and collect the monies adjudged or decreed to be payable in
the manner provided by law out of the property of the Company or any other
obligor upon such Securities and any Coupons appertaining thereto, wherever
situated.

     If an Event of Default with respect to Securities of any series occurs and
is continuing, the Trustee may in its discretion proceed to protect and enforce
its rights and the rights of the Holders of Securities of such series and any
Coupons appertaining thereto by such appropriate judicial proceedings as the
Trustee shall deem most effectual to protect and enforce any such rights,
whether for the specific enforcement of any covenant or agreement in this
Indenture or such Securities or in aid of the exercise of any power granted
herein or therein, or to enforce any other proper remedy.

Section 504.  Trustee May File Proofs of Claim.
              -------------------------------- 

     In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, arrangement, adjustment, composition or other
judicial proceeding relative to the Company or any other obligor upon the
Securities or the property of the Company or such other obligor or their
creditors, the Trustee (irrespective of whether the principal of the Securities
shall then be due and payable as therein expressed or by declaration or
otherwise and irrespective of whether the Trustee shall have made any demand on
the Company for the payment of any overdue principal, premium, interest or
Additional Amounts) shall be entitled and empowered, by intervention in such
proceeding or otherwise, to take any and all actions authorized under the Trust
Indenture Act in order to have claims of the Holders and the Trustee allowed in
any such proceeding, including:

     (1) to file and prove a claim for the whole amount, or such lesser amount
as may be provided for in the Securities of such series, of the principal and
any premium, interest and Additional Amounts owing and unpaid in respect of the
Securities and any Coupons appertaining thereto and to file such other papers or
documents as may be necessary or advisable in order to have the claims of the
Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents or counsel) and of the
Holders of Securities or any Coupons allowed in such judicial proceeding, and

     (2) to collect and receive any monies or other property payable or
deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
other similar official in any such judicial proceeding is hereby authorized by
each Holder of Securities or any Coupons to make such payments to the Trustee
and, in the event that the Trustee shall consent to the making of such payments
directly to the Holders of Securities or any Coupons, to pay to the Trustee any
amount due to it for the reasonable compensation, expenses, disbursements and

                                      -47-
<PAGE>
 
advances of the Trustee, its agents and counsel and any other amounts due the
Trustee under Section 606.

     Nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder of a Security
or any Coupon any plan of reorganization, arrangement, adjustment or composition
affecting the Securities or Coupons or the rights of any Holder thereof, or to
authorize the Trustee to vote in respect of the claim of any Holder of a
Security or any Coupon in any such proceeding; provided, however, that the
                                               --------  -------          
Trustee may, on behalf of the Holders of Securities or any Coupons, vote for the
election of a trustee in bankruptcy or similar official and be a member of a
creditors or other similar committee.

Section 505.  Trustee May Enforce Claims Without Possession of Securities or
              --------------------------------------------------------------
Coupons.
- ------- 

     All rights of action and claims under this Indenture or any of the
Securities or Coupons may be prosecuted and enforced by the Trustee without the
possession of any of the Securities or Coupons or the production thereof in any
proceeding relating thereto, and any such proceeding instituted by the Trustee
shall be brought in its own name as trustee of an express trust, and any
recovery or judgment, after provision for the payment of the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, shall be for the ratable benefit of each and every Holder of a
Security or Coupon in respect of which such judgment has been recovered.

Section 506.  Application of Money Collected.
              ------------------------------ 

     Any money collected by the Trustee pursuant to this Article Five shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal, or any
premium, interest or Additional Amounts, upon presentation of the Securities or
Coupons, or both, as the case may be, and the notation thereon of the payment if
only partially paid and upon surrender thereof if fully paid:

     FIRST: To the payment of all amounts due the Trustee and any predecessor
Trustee under Section 606;

     SECOND: To the payment of the amounts then due and unpaid upon the
Securities and any Coupons for principal and any premium, interest and
Additional Amounts in respect of which or for the benefit of which such money
has been collected, ratably, without preference or priority of any kind,
according to the aggregate amounts due and payable on such Securities and
Coupons for principal and any premium, interest and Additional Amounts,
respectively;

     THIRD: The balance, if any, to the Person or Persons entitled thereto.

Section 507.  Limitations on Suits.
              -------------------- 

     No Holder of any Security of any series or any Coupons appertaining thereto
shall have any right to institute any proceeding, judicial or otherwise, with
respect to this Indenture,  the

                                      -48-
<PAGE>
 
Securities of any series or any Coupons appertaining thereto, or for the
appointment of a receiver or trustee, or for any other remedy hereunder, unless:

     (1) such Holder has previously given written notice to the Trustee of a
continuing Event of Default with respect to the Securities of such series;

     (2) the Holders of not less than 25% in principal amount of the Outstanding
Securities of such series shall have made written request to the Trustee to
institute proceedings in respect of such Event of Default in its own name as
Trustee hereunder;

     (3)  such Holder or Holders have offered to the Trustee reasonable
indemnity against the costs, expenses and liabilities to be incurred in
compliance with such request;

     (4)  the Trustee for 60 days after its receipt of such notice, request and
offer of indemnity has failed to institute any such proceeding; and

     (5)  no direction inconsistent with such written request has been given to
the Trustee during such 60-day period by the Holders of a majority in principal
amount of the Outstanding Securities of such series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture or any Security to affect, disturb or prejudice the rights of
any other such Holders or Holders of Securities of any other series, or to
obtain or to seek to obtain priority or preference over any other Holders or to
enforce any right under this Indenture, except in the manner herein provided and
for the equal and ratable benefit of all such Holders.

Section 508.  Unconditional Right of Holders to Receive Principal and Any
              -----------------------------------------------------------
Premium, Interest and Additional Amounts.
- ---------------------------------------- 

     Notwithstanding any other provision in this Indenture, the Holder of any
Security or Coupon shall have the right, which is absolute and unconditional, to
receive payment of the principal of, any premium and (subject to Section 307)
interest on, and any Additional Amounts with respect to such Security or such
Coupon, as the case may be, on the respective Stated Maturity or Maturities
therefor specified in such Security or Coupon (or, in the case of redemption, on
the Redemption Date or, in the case of repayment at the option of such Holder if
provided in or pursuant to this Indenture, on the Repayment Date) and to convert
such Security in accordance with Article Twelve (if conversion is permitted by
the terms of such Security), and to institute suit for the enforcement of any
such payment and right to convert, and such rights shall not be impaired without
the consent of such Holder.

Section 509.  Restoration of Rights and Remedies.
              ---------------------------------- 

     If the Trustee or any Holder of a Security or a Coupon has instituted any
proceeding to enforce any right or remedy under this Indenture and such
proceeding has been discontinued or abandoned for any reason, or has been
determined adversely to the Trustee or to such Holder,

                                      -49-
<PAGE>
 
then and in every such case the Company, the Trustee and each such Holder shall,
subject to any determination in such proceeding, be restored severally and
respectively to their former positions hereunder, and thereafter all rights and
remedies of the Trustee and each such Holder shall continue as though no such
proceeding had been instituted.

Section 510.  Rights and Remedies Cumulative.
              ------------------------------ 

     Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Securities or Coupons in the last paragraph
of Section 306, no right or remedy herein conferred upon or reserved to the
Trustee or to each and every Holder of a Security or a Coupon is intended to be
exclusive of any other right or remedy, and every right and remedy, to the
extent permitted by law, shall be cumulative and in addition to every other
right and remedy given hereunder or now or hereafter existing at law or in
equity or otherwise.  The assertion or employment of any right or remedy
hereunder, or otherwise, shall not, to the extent permitted by law, prevent the
concurrent assertion or employment of any other appropriate right or remedy.

Section 511.  Delay or Omission not Waiver.
              ---------------------------- 

     No delay or omission of the Trustee or of any Holder of any Security or
Coupon to exercise any right or remedy accruing upon any Event of Default shall
impair any such right or remedy or constitute a waiver of any such Event of
Default or an acquiescence therein.  Every right and remedy given by this
Article Five or by law to the Trustee or to any Holder of a Security or a Coupon
may be exercised from time to time, and as often as may be deemed expedient, by
the Trustee or (subject to the limitations contained in this Indenture) by such
Holder, as the case may be.

Section 512.  Control by Holders of Securities.
              -------------------------------- 

     The Holders of a majority in principal amount of the Outstanding Securities
of any series shall have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Trustee or exercising
any trust or power conferred on the Trustee with respect to the Securities of
such series and any Coupons appertaining thereto, provided that
                                                  -------- ----

     (1) such direction shall not be in conflict with any rule of law or with
this Indenture or with the Securities of such series,

     (2) the Trustee may take any other action deemed proper by the Trustee
which is not inconsistent with such direction, and

     (3) such Holders have offered the Trustee an indemnity reasonably
satisfactory to it against any loss, cost, liability or expense that might been
incurred by the Trustee in following such direction.

                                      -50-
<PAGE>
 
Section 513.  Waiver of Past Defaults.
              ----------------------- 

     The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series on behalf of the Holders of all the
Securities of such series and any Coupons appertaining thereto may waive any
past default hereunder with respect to such series and its consequences, except
a default

     (1) in the payment of the principal of, any premium or interest on, or any
Additional Amounts with respect to, any Security of such series or any Coupons
appertaining thereto, or

     (2) in respect of a covenant or provision hereof which under Article Nine
cannot be modified or amended without the consent of the Holder of each
Outstanding Security of such series affected.

     Upon any such waiver, such default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured, for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
default or impair any right consequent thereon.

Section 514.  Waiver of Usury, Stay or Extension Laws.
              --------------------------------------- 

     The Company covenants that (to the extent that it may lawfully do so) it
will not at any time insist upon, or plead, or in any manner whatsoever claim or
take the benefit or advantage of, any usury, stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company expressly waives (to the
extent that it may lawfully do so) all benefit or advantage of any such law and
covenants that it will not hinder, delay or impede the execution of any power
herein granted to the Trustee, but will suffer and permit the execution of every
such power as though no such law had been enacted.

Section 515.  Undertaking for Costs.
              --------------------- 

     All parties to this Indenture agree, and each Holder of any Security by his
acceptance thereof shall be deemed to have agreed, that any court may in its
discretion require, in any suit for the enforcement of any right or remedy under
this Indenture, or in any suit against the Trustee for any action taken or
omitted by it as Trustee, the filing by any party litigant in such suit of any
undertaking to pay the costs of such suit, and that such court may in its
discretion assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in such suit having due regard to the merits and good
faith of the claims or defenses made by such party litigant; but the provisions
of this Section 515 shall not apply to any suit instituted by the Trustee, to
any suit instituted by any Holder, or group of Holders, holding in the aggregate
more than 10% in principal amount of Outstanding Securities of any series, or to
any suit instituted by any Holder for the enforcement of the payment of the
principal of (or premium, if any) or interest, if any, on or Additional Amounts,
if any, with respect to any Security on or after the respective Stated
Maturities expressed in such Security (or, in the case of redemption, on or
after the Redemption Date, and, in the case of repayment, on or after the date
for repayment) or for the enforcement of the right to convert any Security in
accordance with Article Twelve.

                                      -51-
<PAGE>
 
                                  ARTICLE SIX

                                  THE TRUSTEE

Section 601.  Certain Rights of Trustee; Certain Duties and Responsibilities.
              ---------------------------------------------------------------

     Subject to Sections 315(a) through 315(d) of the Trust Indenture Act:

     (1) the Trustee may conclusively rely and shall be fully protected in
acting or refraining from acting upon any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, coupon, other evidence of indebtedness or other paper or
document reasonably believed by it to be genuine and to have been signed or
presented by the proper party or parties;

     (2) any request or direction of the Company mentioned herein shall be
sufficiently evidenced by a Company Request or a Company Order (in each case,
other than delivery of any Security, together with any Coupons appertaining
thereto, to the Trustee for authentication and delivery pursuant to Section 303
which shall be sufficiently evidenced as provided therein) and any resolution of
the Board of Directors of the Company shall be sufficiently evidenced by a Board
Resolution of the Company;

     (3) whenever in the administration of this Indenture the Trustee shall deem
it desirable that a matter be proved or established prior to taking, suffering
or omitting any action hereunder, the Trustee (unless other evidence shall be
herein specifically prescribed) may, in the absence of bad faith on its part,
rely upon an Officers' Certificate;

     (4) the Trustee may consult with counsel of its selection and the advice of
such counsel or any Opinion of Counsel shall be full and complete authorization
and protection in respect of any action taken, suffered or omitted by it
hereunder in good faith and in reliance thereon;

     (5) the Trustee shall be under no obligation to exercise any of the rights
or powers vested in it by or pursuant to this Indenture at the request or
direction of any of the Holders of Securities of any series or any Coupons
appertaining thereto pursuant to this Indenture, unless such Holders shall have
offered to the Trustee reasonable security or indemnity against the costs,
expenses and liabilities which might be incurred by it in compliance with such
request or direction;

     (6) the Trustee shall not be bound to make any investigation into the facts
or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, coupon, other evidence of indebtedness or other paper or document, but the
Trustee, in its discretion, may make such further inquiry or investigation into
such facts or matters as it may see fit, and, if the Trustee shall determine to
make such further inquiry or investigation, it shall be entitled to examine,
during business hours

                                      -52-
<PAGE>
 
and upon reasonable notice, the books, records and premises of the Company,
personally or by agent or attorney;

     (7) the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder;

     (8) the Trustee undertakes to perform such duties and only such duties as
are specifically set forth in this Indenture, and no implied covenants or
obligations shall be read into this Indenture against the Trustee; and

     (9) no provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act, or its own willful misconduct, except that:

          (a) the Trustee shall not be liable for any error of judgment made in
          good faith by a Responsible Officer, unless it shall be proved that
          the Trustee was negligent in ascertaining the pertinent facts;

          (b) the Trustee shall not be liable with respect to any action taken
          or omitted to be taken by it in good faith in accordance with the
          direction of the Holders of a majority in principal amount of the
          Securities at the time Outstanding relating to the time, method and
          place of conducting any proceeding for any remedy available to the
          Trustee, or exercising any trust or power conferred upon the Trustee,
          under this Indenture; and

          (c) this paragraph (9) shall not be construed to limit the effect of
          paragraph (8) of this Section 601.

     The duties and responsibilities of the Trustee shall be as provided by the
Trust Indenture Act and this Indenture.  Notwithstanding the foregoing, no
provision of this Indenture shall require the Trustee to expend or risk its own
funds or otherwise incur any financial liability in the performance of any of
its duties hereunder, or in the exercise of any of its rights or powers, if it
shall have reasonable grounds for believing that repayment of such funds or
indemnity reasonably satisfactory to it against such risk or liability is not
reasonably assured to it.  Whether or not therein expressly so provided, every
provision of this Indenture relating to the conduct or affecting the liability
of or affording protection to the Trustee shall be subject to the provisions of
this Section 601.

Section 602.  Notice of Defaults.
              ------------------ 

     Within 90 days after the occurrence of any Default (actually known to a
Responsible Officer of the Trustee) hereunder with respect to the Securities of
any series, the Trustee shall transmit by mail to all Holders of Securities of
such series entitled to receive reports pursuant to Section 703(3), notice of
such Default hereunder known to the Trustee, unless such Default shall 

                                      -53-
<PAGE>
 
have been cured or waived; provided, however, that, except in the case of a
                           --------  -------
default in the payment of the principal of (or premium, if any), or interest, if
any, on, or Additional Amounts or any sinking fund or purchase fund installment
with respect to, any Security of such series, the Trustee shall be protected in
withholding such notice if and so long as the board of directors, the executive
committee or a trust committee of directors and/or Responsible Officers of the
Trustee in good faith determine that the withholding of such notice is in the
best interest of the Holders of Securities and Coupons of such series, and
provided, further, that in the case of any Default of the character specified in
- --------  -------
Section 501(4) with respect to Securities of such series, no such notice to
Holders shall be given until at least 60 days after the occurrence thereof.

Section 603.  Not Responsible for Recitals or Issuance of Securities.
              ------------------------------------------------------ 

     The recitals contained herein and in the Securities, except the Trustee's
certificate of authentication, and in any Coupons shall be taken as the
statements of the Company, and neither the Trustee nor any Authenticating Agent
assumes any responsibility for their correctness.  The Trustee makes no
representations as to the validity or sufficiency of this Indenture or of the
Securities or Coupons appertaining thereto or the Common Stock issuable upon the
conversion of Securities in accordance with the provisions of Article Twelve,
except that the Trustee represents that it is duly authorized to execute and
deliver this Indenture, authenticate the Securities and perform its obligations
hereunder and that the statements made by it in a Statement of Eligibility and
Qualification on Form T-1 supplied to the Company are true and accurate, subject
to the qualifications set forth therein.  Neither the Trustee nor any
Authenticating Agent shall be accountable for the use or application by the
Company of the Securities or the proceeds thereof.

Section 604.  May Hold Securities; Act as Trustee Under Other Indenture.
              --------------------------------------------------------- 

     The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other Person that may be an agent of the Trustee or the
Company, in its individual or any other capacity, may become the owner or
pledgee of Securities or Coupons and, subject to Sections 310(b) and 311 of the
Trust Indenture Act, may otherwise deal with the Company with the same rights it
would have if it were not Trustee, Authenticating Agent, Paying Agent, Security
Registrar or such other agent.

     Subject to Section 310(b) and 311 of the Trust Indenture Act, the Trustee
may become and act as trustee under other indentures under which other
securities, or certificates of interest or participation in other securities, of
the Company or any Subsidiary thereof are outstanding in the same manner as if
it were not Trustee hereunder.

Section 605.  Money Held in Trust.
              ------------------- 

     Except as provided in Section 403 and Section 1003, money held by the
Trustee in trust hereunder need not be segregated from other funds except to the
extent required by law and shall be held uninvested.  The Trustee shall be under
no liability for interest on any money received by it hereunder except as
otherwise agreed in writing with the Company.

                                      -54-
<PAGE>
 
Section 606.  Compensation and Reimbursement.
              ------------------------------ 

     The Company agrees:

     (1) to pay to the Trustee from time to time reasonable compensation as
shall be agreed in writing between the Company on the one hand and the Trustee
on the other for all services rendered by the Trustee hereunder (which
compensation shall not be limited by any provision of law in regard to the
compensation of a trustee of an express trust);

     (2) except as otherwise expressly provided herein, to reimburse the Trustee
upon its request for all reasonable expenses, disbursements and advances
incurred or made by the Trustee in accordance with any provision of this
Indenture (including the reasonable compensation and the expenses and
disbursements of its agents and counsel), except any such expense, disbursement
or advance as may be attributable to the Trustee's negligence or bad faith; and

     (3) to indemnify the Trustee and its officers, directors, employees and
agents for, and to hold them harmless against, any loss, liability or expense
incurred without negligence or bad faith on their part, arising out of or in
connection with the acceptance or administration of the trust or trusts
hereunder, including the costs and expenses of defending themselves against any
claim or liability in connection with the exercise or performance of any of
their powers or duties hereunder, except to the extent that any such loss,
liability or expense was due to the Trustee's negligence or bad faith.  The
indemnification provided for herein shall survive the termination of this
Indenture or the earlier resignation or removal of the Trustee.

     As security for the performance of the obligations of the Company under
this Section 606, the Trustee shall have a lien prior to the Securities of any
series upon all property and funds held or collected by the Trustee as such,
except funds held in trust for the payment of principal of, and premium or
interest on or any Additional Amounts with respect to Securities or any Coupons
appertaining thereto.

     Any compensation or expense incurred by the Trustee after a default
specified by Section 501 is intended to constitute an expense of administration
under any then applicable bankruptcy or insolvency law.  "Trustee" for purposes
                                                          -------              
of this Section 606 shall include any predecessor Trustee but the negligence or
bad faith of any Trustee shall not affect the rights of any other Trustee under
this Section 606.

Section 607.  Corporate Trustee Required; Eligibility.
              --------------------------------------- 

     There shall at all times be a Trustee hereunder that is a Corporation,
organized and doing business under the laws of the United States, eligible under
Section 310(a)(1) of the Trust Indenture Act to act as trustee under an
indenture qualified under the Trust Indenture Act and that has a combined
capital and surplus (computed in accordance with Section 310(a)(2) of the Trust
Indenture Act) of at least $50,000,000 and subject to supervision or examination
by Federal or state authority.  If at any time the Trustee shall cease to be
eligible in accordance with the provisions of this Section, it shall resign
immediately in the manner and with the effect hereinafter specified in this
Article.

                                      -55-
<PAGE>
 
Section 608.  Resignation and Removal; Appointment of Successor.
              ------------------------------------------------- 

     (1) No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article shall become effective until the
acceptance of appointment by the successor Trustee pursuant to Section 609.

     (2) The Trustee may resign at any time with respect to the Securities of
one or more series by giving written notice thereof to the Company.  If the
instrument of acceptance by a successor Trustee required by Section 609 shall
not have been delivered to the Trustee within 30 days after the giving of such
notice of resignation, the resigning Trustee may petition any court of competent
jurisdiction for the appointment of a successor Trustee with respect to the
Securities of such series.

     (3) The Trustee may be removed at any time with respect to the Securities
of any series by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series, delivered to the Trustee and to the
Company.

     (4)  If at any time:

          (a) the Trustee shall fail to comply with the obligations imposed upon
     it under Section 310(b) of the Trust Indenture Act with respect to
     Securities of any series after written request therefor by the Company or
     any Holder of a Security of such series who has been a bona fide Holder of
     a Security of such series for at least six months, or

          (b) the Trustee shall cease to be eligible under Section 607 and shall
     fail to resign after written request therefor by the Company or any such
     Holder, or

          (c) the Trustee shall become incapable of acting or shall be adjudged
     to be bankrupt or insolvent or a receiver of the Trustee or of its property
     shall be appointed or any public officer shall take charge or control of
     the Trustee or of its property or affairs for the purpose of
     rehabilitation, conservation or liquidation,

     then, in any such case, (i) the Company, by or pursuant to a Board
Resolution, may remove the Trustee with respect to all Securities or the
Securities of such series, or (ii) subject to Section 315(e) of the Trust
Indenture Act, any Holder of a Security who has been a bona fide Holder of a
Security of such series for at least six months may, on behalf of himself and
all others similarly situated, petition any court of competent jurisdiction for
the removal of the Trustee with respect to all Securities of such series and the
appointment of a successor Trustee or Trustees.

     (5) If the Trustee shall resign, be removed or become incapable of acting,
or if a vacancy shall occur in the office of Trustee for any cause, with respect
to the Securities of one or more series, the Company, by or pursuant to a Board
Resolution, shall promptly appoint a successor Trustee or Trustees with respect
to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the Securities of

                                      -56-
<PAGE>
 
one or more or all of such series and that at any time there shall be only one
Trustee with respect to the Securities of any particular series) and shall
comply with the applicable requirements of Section 609. If, within one year
after such resignation, removal or incapability, or the occurrence of such
vacancy, a successor Trustee with respect to the Securities of any series shall
be appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its acceptance
of such appointment in accordance with the applicable requirements of Section
609, become the successor Trustee with respect to the Securities of such series
and to that extent supersede the successor Trustee appointed by the Company. If
no successor Trustee with respect to the Securities of any series shall have
been so appointed by the Company or the Holders of Securities and accepted
appointment in the manner required by Section 609, any Holder of a Security who
has been a bona fide Holder of a Security of such series for at least six months
may, on behalf of himself and all others similarly situated, petition any court
of competent jurisdiction for the appointment of a successor Trustee with
respect to the Securities of such series.

     (6) The Company shall give notice of each resignation and each removal of
the Trustee with respect to the Securities of any series and each appointment of
a successor Trustee with respect to the Securities of any series by mailing
written notice of such event by first-class mail, postage prepaid, to the
Holders of Registered Securities, if any, of such series as their names and
addresses appear in the Security Register and, if Securities of such series are
issued as Bearer Securities, by publishing notice of such event once in an
Authorized Newspaper in each Place of Payment located outside the United States.
Each notice shall include the name of the successor Trustee with respect to the
Securities of such series and the address of its Corporate Trust Office.

     (7) The retiring Trustee shall not be liable for any of the acts or
omissions of any successor Trustee appointed hereunder.

     (8) No appointment of a successor Trustee shall be effective until all
fees, charges and expenses of the retiring Trustee not subject to any good faith
dispute, have been paid.

Section 609.  Acceptance of Appointment by Successor.
              -------------------------------------- 

     (1) Upon the appointment hereunder of any successor Trustee with respect to
all Securities, such successor Trustee so appointed shall execute, acknowledge
and deliver to the Company and the retiring Trustee an instrument accepting such
appointment, and thereupon the resignation or removal of the retiring Trustee
shall become effective and such successor Trustee, without any further act, deed
or conveyance, shall become vested with all the rights, powers, trusts and
duties hereunder of the retiring Trustee; but, on the request of the Company or
such successor Trustee, such retiring Trustee, upon payment of its charges,
shall execute and deliver an instrument transferring to such successor Trustee
all the rights, powers and trusts of the retiring Trustee and, subject to
Section 1003, shall duly assign, transfer and deliver to such successor Trustee
all property and money held by such retiring Trustee hereunder, subject
nevertheless to its claim, if any, provided for in Section 606.

                                      -57-
<PAGE>
 
     (2) Upon the appointment hereunder of any successor Trustee with respect to
the Securities of one or more series, the Company,  the retiring Trustee and
such successor Trustee shall execute and deliver an indenture supplemental
hereto wherein each successor Trustee shall accept such appointment and which
(a) shall contain such provisions as shall be necessary or desirable to transfer
and confirm to, and to vest in, such successor Trustee all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of that
or those series to which the appointment of such successor Trustee relates, (b)
if the retiring Trustee is not retiring with respect to all Securities, shall
contain such provisions as shall be deemed necessary or desirable to confirm
that all the rights, powers, trusts and duties of the retiring Trustee with
respect to the Securities of that or those series as to which the retiring
Trustee is not retiring shall continue to be vested in the retiring Trustee, and
(c) shall add to or change any of the provisions of this Indenture as shall be
necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, it being understood that nothing herein or
in such supplemental indenture shall constitute such Trustees co-trustees of the
same trust, that each such Trustee shall be trustee of a trust or trusts
hereunder separate and apart from any trust or trusts hereunder administered by
any other such Trustee and that no Trustee shall be responsible for any notice
given to, or received by, or any act or failure to act on the part of any other
Trustee hereunder, and, upon the execution and delivery of such supplemental
indenture, the resignation or removal of the retiring Trustee shall become
effective to the extent provided therein, such retiring Trustee shall have no
further responsibility for the exercise of rights and powers or for the
performance of the duties and obligations vested in the Trustee under this
Indenture with respect to the Securities of that or those series to which the
appointment of such successor Trustee relates other than as hereinafter
expressly set forth, and such successor Trustee, without any further act, deed
or conveyance, shall become vested with all the rights, powers, trusts and
duties of the retiring Trustee with respect to the Securities of that or those
series to which the appointment of such successor Trustee relates; but, on
request of the Company or such successor Trustee, such retiring Trustee, upon
payment of its charges with respect to the Securities of that or those series to
which the appointment of such successor relates and subject to Section 1003
shall duly assign, transfer and deliver to such successor Trustee, to the extent
contemplated by such supplemental indenture, the property and money held by the
retiring Trustee hereunder with respect to the securities of that or those
series to which the appointment of such successor Trustee relates, subject to
its claim, if any, provided for in Section 606.

     (3) Upon request of any Person appointed hereunder as a successor Trustee,
the Company shall execute any and all instruments for more fully and certainly
vesting in and confirming to such successor Trustee all such rights, powers and
trusts referred to in paragraph (1) or (2) of this Section, as the case may be.

     (4) No Person shall accept its appointment hereunder as a successor Trustee
unless at the time of such acceptance such successor Person shall be qualified
and eligible under this Article Six.

Section 610.  Merger, Conversion, Consolidation or Succession to Business.
              ----------------------------------------------------------- 

     Any Corporation into which the Trustee may be merged or converted or with
which it may be consolidated, or any Corporation resulting from any merger,
conversion or consolidation

                                      -58-
<PAGE>
 
to which the Trustee shall be a party, or any Corporation succeeding to all or
all of the corporate trust business of the Trustee, shall be the successor of
the Trustee hereunder, provided such Corporation shall be otherwise qualified
and eligible under this Article Six, without the execution or filing of any
paper or any further act on the part of any of the parties hereto. In case any
Securities shall have been authenticated but not delivered by the Trustee then
in office, any successor by merger, conversion or consolidation to such
authenticating Trustee may adopt such authentication and deliver the Securities
so authenticated with the same effect as if such successor Trustee had itself
authenticated such Securities.

Section 611.  Preferential Collection of Claims Against Company.
              ------------------------------------------------- 

     If and when the Trustee shall be or become a creditor of the Company or any
other obligor upon the Securities, the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Company or any such other obligor.

Section 612.  Appointment of Authenticating Agent.
              ----------------------------------- 

     The Trustee may appoint one or more Authenticating Agents acceptable to the
Company with respect to one or more series of Securities which shall be
authorized to act on behalf of the Trustee to authenticate Securities of that or
those series issued upon original issue, exchange, registration of transfer,
partial redemption or partial repayment, or pursuant to Section 306, and
Securities so authenticated shall be entitled to the benefits of this Indenture
and shall be valid and obligatory for all purposes as if authenticated by the
Trustee hereunder.  Except in the case of an original issuance or in the case of
replacement of lost, stolen or destroyed securities, wherever reference is made
in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent and a certificate of authentication executed on behalf of
the Trustee by an Authenticating Agent.

     Each Authenticating Agent shall be acceptable to the Company and, except as
provided in or pursuant to this Indenture, shall at all times be a corporation
that would be permitted by the Trust Indenture Act to act as trustee under an
indenture qualified under the Trust Indenture Act, is authorized under
applicable law and by its charter to act as an Authenticating Agent and has a
combined capital and surplus (computed in accordance with Section 310(a)(2) of
the Trust Indenture Act) of at least $50,000,000.   If at any time an
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, it shall resign immediately in the manner and with
the effect specified in this Section.

     Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to all or substantially all of
the corporate agency or corporate trust business of an Authenticating Agent,
shall be the successor of such Authenticating Agent hereunder, provided such
corporation shall be otherwise eligible under this Section, without the
execution or filing of any paper or any further act on the part of the Trustee
or the Authenticating Agent.

                                      -59-
<PAGE>
 
     An Authenticating Agent may resign at any time by giving written notice
thereof to the Trustee and the Company.  The Trustee may at any time terminate
the agency of an Authenticating Agent by giving written notice thereof to such
Authenticating Agent and the Company.  Upon receiving such a notice of
resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be acceptable to the Company and shall (i) mail written notice
of such appointment by first-class mail, postage prepaid, to all Holders of
Registered Securities, if any, of the series with respect to which such
Authenticating Agent shall serve, as their names and addresses appear in the
Security Register, and (ii) if Securities of the series are issued as Bearer
Securities, publish notice of such appointment at least once in an Authorized
Newspaper in the place where such successor Authenticating Agent has its
principal office if such office is located outside the United States.  Any
successor Authenticating Agent, upon acceptance of its appointment hereunder,
shall become vested with all the rights, powers and duties of its predecessor
hereunder, with like effect as if originally named as an Authenticating Agent.
No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section.

     The Company agrees to pay each Authenticating Agent from time to time
reasonable compensation for its services under this Section.  If the Trustee
makes such payments, it shall be entitled to be reimbursed for such payments,
subject to the provisions of Section 606.

     The provisions of Sections 308, 603 and 604 shall be applicable to each
Authenticating Agent.

     If an Authenticating Agent is appointed with respect to one or more series
of Securities pursuant to this Section, the Securities of such series may have
endorsed thereon, in addition to or in lieu of the Trustee's certificate of
authentication, an alternate certificate of authentication in substantially the
following form:

     This is one of the Securities of the series designated therein referred to
in the within-mentioned Indenture.


Dated:                                [NAME OF TRUSTEE],
      --------------------            As Trustee


                                    By:  [NAME OF AUTHENTICATION AGENT]
                                          As Authenticating Agent


                                    By:
                                       -----------------------
                                       Authorized Officer

                                      -60-
<PAGE>
 
     If all of the Securities of any series may not be originally issued at one
time, and if the Trustee does not have an office capable of authenticating
Securities upon original issuance located in a Place of Payment where the
Company wishes to have Securities of such series authenticated upon original
issuance, the Trustee, if so requested in writing (which writing need not be
accompanied by or contained in an Officers' Certificate by the Company), shall
appoint in accordance with this Section 612 an Authenticating Agent having an
office in a Place of Payment designated by the Company with respect to such
series of Securities.

Section 613.  Conflicting Interests.
              --------------------- 

     If the Trustee has or shall acquire any conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of the Trust Indenture Act and this Indenture.  To the extent
permitted by such Act, the Trustee shall not be deemed to have a conflicting
interest by virtue of being a trustee under this Indenture with respect to
Securities of more than one series or a trustee under other indentures between
the Company or a Subsidiary thereof and the Trustee that have not been satisfied
and discharged and that may be excluded by the proviso to Section 310(b)(1) of
the Trust Indenture Act.

Section 614.  Protection of Agents.
             --------------------- 

          Any Authenticating Agent, Conversion Agent, Paying Agent or Securities
Registrar hereunder shall be entitled to all of the rights, immunities,
indemnities and protections afforded to the Trustee hereunder.

                                 ARTICLE SEVEN

                HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY

Section 701.  Company to Furnish Trustee Names and Addresses of Holders.
              --------------------------------------------------------- 

     In accordance with Section 312(a) of the Trust Indenture Act, with respect
to each series of the Securities, the Company shall furnish or cause to be
furnished to the Trustee:

     (1) semi-annually, not later than 15 days after the Regular Record Date or
upon such other dates as are set forth in or pursuant to the Board Resolution,
Officers' Certificate or indenture supplemental hereto authorizing such series,
a list for each series of Securities, in such form as the Trustee may reasonably
require, of the names and addresses of Holders of Registered Securities as of
the applicable date, and

     (2) at such other times as the Trustee may request in writing, within 30
days after the receipt by the Company of any such request, a list of similar
form and content as of a date not more than 15 days prior to the time such list
is furnished, excluding from any such list names and addresses received by the
Trustee in its capacity as Security Registrar.

                                      -61-
<PAGE>
 
Section 702.  Preservation of Information; Communications to Holders.
              ------------------------------------------------------ 

     The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 701 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar.  The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.

     The rights of the Holders to communicate with other Holders with respect to
their rights under this Indenture or under the Securities, and the corresponding
rights, privileges and obligations of the Trustee, shall be as provided by the
Trust Indenture Act.

     Every Holder of Securities or Coupons, by receiving and holding the same,
agrees with the Company and the Trustee that neither the Company nor the
Trustee, nor any agent of any of them, shall be held accountable by reason of
the disclosure of any such information as to the names and addresses of the
Holders of Securities in accordance with Section 312(c) of the Trust Indenture
Act, regardless of the source from which such information was derived, and that
the Trustee shall not be held accountable by reason of mailing any material
pursuant to a request made under Section 312(b) of the Trust Indenture Act.

Section 703.  Reports by Trustee.
              ------------------ 

          (1) Within 60 days after July 15 of each year commencing with the
     first July 15 following the first issuance of Securities pursuant to
     Section 301, if required by Section 313(a) of the Trust Indenture Act, the
     Trustee shall transmit, pursuant to Section 313(c) of the Trust Indenture
     Act, a brief report dated as of such July 15 with respect to any of the
     events specified in said Section 313(a) which may have occurred since the
     later of the immediately preceding July 15 and the date of this Indenture.

          (2) The Trustee shall transmit to Holders the reports concerning the
     Trustee and its actions under this Indenture as may be required pursuant to
     the Trust Indenture Act at the times and in the manner specified therein.

          (3) Reports pursuant to this Section shall be transmitted in the
     manner and to the Persons required by Sections 313(c) and 313(d) of the
     Trust Indenture Act.

Section 704.  Reports by Company.
              ------------------ 

     The Company, pursuant to Section 314(a) of the Trust Indenture Act, shall:

          (1) file with the Trustee, within 15 days after the Company is
     required to file the same with the Commission, copies of the annual reports
     and of the information, documents and other reports (or copies of such
     portions of any of the foregoing as the Commission may from time to time by
     rules and regulations prescribe) which the Company may be required to file
     with the Commission pursuant to Section 13 or Section 15(d) of the Exchange
     Act; or, if the Company is not required to file information, 

                                      -62-
<PAGE>
 
     documents or reports pursuant to either of said Sections, then it shall
     file with the Trustee and the Commission, in accordance with rules and
     regulations prescribed from time to time by the Commission, such of the
     supplementary and periodic information, documents and reports which may be
     required pursuant to Section 13 of the Exchange Act in respect of a
     security listed and registered on a national securities exchange as may be
     prescribed from time to time in such rules and regulations;

          (2) file with the Trustee and the Commission, in accordance with rules
     and regulations prescribed from time to time by the Commission, such
     additional information, documents and reports with respect to compliance by
     the Company with the conditions and covenants of this Indenture as may be
     required from time to time by such rules and regulations; and

          (3) transmit within 30 days after the filing thereof with the Trustee,
     in the manner and to the extent provided in Section 313(c) of the Trust
     Indenture Act, such summaries of any information, documents and reports
     required to be filed by the Company pursuant to paragraphs (1) and (2) of
     this Section as may be required by rules and regulations prescribed from
     time to time by the Commission.


                                 ARTICLE EIGHT

                 CONSOLIDATION, MERGER, CONVEYANCE OR TRANSFER

Section 801.  Company May Consolidate, Etc., Only on Certain Terms.
              ---------------------------------------------------- 

     The Company shall not consolidate with or merge into any other Person or
convey, transfer or lease all or substantially all of its properties and assets
to any Person, and the Company shall not permit any Person to consolidate with
or merge into the Company or convey, transfer or lease all or substantially all
of its properties and assets  to the Company  unless either:

          (a) in case the Company shall consolidate with or merge into another
     Person or convey, transfer or lease all or substantially all of its
     properties and assets  to any Person, the Person formed by such
     consolidation or into which the Company is merged or the Person which
     acquires by conveyance or transfer, or which leases, all or substantially
     all of the properties and assets of the Company shall be (i) a corporation,
     limited liability company, partnership or trust organized and validly
     existing under the laws of the United States or (ii) a corporation, limited
     liability company, partnership or trust organized and validly existing
     under the laws of a jurisdiction other than the United States (a "Foreign
                                                                       -------
     Entity") that shall expressly assume, by an indenture supplemental hereto
     ------                                                                   
     executed and delivered to the Trustee, in form reasonably satisfactory to
     the Trustee, the due and punctual payment of the principal of (and premium,
     if any) and interest and Other Additional Amounts on all the Securities and
     Coupons and the performance and observance of every covenant of this
     Indenture on the part of the Company to be performed or observed and shall
     have provided for conversion rights in accordance with Article Twelve;

                                      -63-
<PAGE>
 
          (b) immediately after giving effect to such transaction and treating
     any indebtedness which becomes an obligation of the Company or one of its
     Subsidiaries as a result of such transaction as having been incurred by the
     Company or such Subsidiary at the time of such transaction, no Event of
     Default, and no event which, after notice or lapse of time or both, would
     become an Event of Default, shall have happened and be continuing; and

          (c) the Company  has delivered to the Trustee an Officers' Certificate
     and an Opinion of Counsel, each stating that such consolidation, merger,
     conveyance, transfer or lease and, if a supplemental indenture is required
     in connection with such transaction, such supplemental indenture comply
     with this Article and that all conditions precedent herein provided for
     relating to such transaction have been complied with.

Section 802.  Successor Corporation Substituted.
              --------------------------------- 

     Upon any consolidation by the Company with or merger by the Company into
any other Person or any conveyance, transfer or lease of all or substantially
all of the properties and assets of the Company, in accordance with Section 801,
the successor Person formed by such consolidation or into which the Company is
merged or to which such conveyance, transfer or lease is made, shall succeed to,
and be substituted for, and may exercise every right and power of, the Company
under this Indenture with the same effect as if such successor Person had been
named as the Company herein, and thereafter, except in the case of a lease, the
predecessor Person shall be relieved of all obligations and covenants under this
Indenture and the Securities.


                                  ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

Section 901.  Supplemental Indentures Without Consent of Holders.
              -------------------------------------------------- 

     Without the consent of any Holders of Securities or Coupons, the Company,
when authorized by or pursuant to a Board Resolution,  and the Trustee, at any
time and from time to time, may enter into one or more indentures supplemental
hereto, in form satisfactory to the Trustee, for any of the following purposes:

     (1) to evidence the succession of another Person to the Company and the
assumption by any such successor of the covenants of the Company contained
herein and in the Securities; or

     (2) to add to the covenants of the Company for the benefit of the Holders
of all or any series of Securities (as shall be specified in such supplemental
indenture or indentures and if such covenants are to be for the benefit of less
than all series of Securities, stating that such covenants are being included
solely for the benefit of such series) or to surrender any right or power herein
conferred upon the Company; or

                                      -64-
<PAGE>
 
     (3) to add to or change any of the provisions of this Indenture to provide
that Bearer Securities may be registrable as to principal, to change or
eliminate any restrictions on the payment of principal of, any premium or
interest on or any Additional Amounts with respect to Securities, to permit
Bearer Securities to be issued in exchange for Registered Securities, to permit
Bearer Securities to be exchanged for Bearer Securities of additional authorized
denominations or to permit or facilitate the issuance of Securities in
uncertificated form, provided any such action shall not adversely affect the
interests of the Holders of Securities of any series or any Coupons appertaining
thereto in any material respect; or

     (4) to establish the form or terms of Securities of any series and any
Coupons appertaining thereto as permitted by Sections 201 and 301; or

     (5) to evidence and provide for the acceptance of appointment hereunder by
a successor Trustee with respect to the Securities of one or more series and to
add to or change any of the provisions of this Indenture as shall be necessary
to provide for or facilitate the administration of the trusts hereunder by more
than one Trustee, pursuant to the requirements of Section 609; or

     (6) to cure any ambiguity or to correct or supplement any provision herein
which may be defective or inconsistent with any other provision herein, or to
make any other provisions with respect to matters or questions arising under
this Indenture which shall not adversely affect the interests of the Holders of
Securities of any series then Outstanding or any Coupons appertaining thereto in
any material respect; or

     (7) to add any additional Events of Default with respect to all or any
series of Securities (as shall be specified in such supplemental indenture and
if such additional Events of Default are to be for the benefit of less than all
series of Securities, stating that such additional Event of Default are
expressly being included solely for the benefit of such series); or

     (8) to supplement any of the provisions of this Indenture to such extent as
shall be necessary to permit or facilitate the defeasance and discharge of any
series of Securities pursuant to Article Four, provided that any such action
shall not adversely affect the interests of any Holder of a Security of such
series and any Coupons appertaining thereto or any other Security or Coupon in
any material respect; or

     (9)  to secure the Securities; or

     (10) to amend or supplement any provision contained herein or in any
supplemental indenture (which amendment or supplement may apply to one or more
series of Securities or to one or more Securities within any series as specified
in such supplemental indenture or indentures), provided that such amendment or
supplement does not apply to any Outstanding Security issued prior to the date
of such supplemental indenture and entitled to the benefits of such provision or
modify the rights of the Holder of any such Security with respect to such
provision.

                                      -65-
<PAGE>
 
Section 902.  Supplemental Indentures With Consent of Holders.
              ----------------------------------------------- 

     With the consent of the Holders of not less than a majority in principal
amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by or pursuant to a Board Resolution, and
the Trustee may enter into an indenture or indentures supplemental hereto for
the purpose of adding any provisions to or changing in any manner or eliminating
any of the provisions of this Indenture or of the Securities of such series or
of modifying in any manner the rights of the Holders of Securities of such
series under this Indenture; provided, however, that no such supplemental
                             --------  -------                           
indenture, without the consent of the Holder of each Outstanding Security
affected thereby, shall

          (1) change the Stated Maturity of the principal of, or any premium or
     installment of principal or interest on or any Additional Amounts with
     respect to, any Security, or any sinking fund or analogous payment in
     respect thereof, or reduce the principal amount thereof or the rate (or
     modify the calculation of such rate) of interest thereon or any Additional
     Amounts with respect thereto, or any premium payable upon the redemption
     thereof or otherwise, or change the obligation of the Company to pay
     Additional Amounts pursuant to Section 1004, or reduce the amount of the
     principal of any Security that would be due and payable upon a declaration
     of acceleration of the Maturity thereof pursuant to Section 502 or the
     amount thereof provable in bankruptcy pursuant to Section 504, adversely
     affect the right of repayment at the option of any Holder as contemplated
     by Article Fifteen, or change the provisions of Article Ten relating to
     Place of Payment for Bearer Securities being located outside the United
     States, or the Currency in which the principal of, any premium or interest
     on, or any Additional Amounts with respect to any Security or any sinking
     or analogous fund payment in respect thereof, is payable, or impair the
     right to institute suit for the enforcement of any such payment on or after
     the Stated Maturity thereof (or, in the case of redemption, on or after the
     Redemption Date or, in the case of repayment at the option of the Holder,
     on or after the Repayment Date), or

          (2) reduce the percentage in principal amount of the Outstanding
     Securities of any series, the consent of whose Holders is required for any
     such supplemental indenture, or the consent of whose Holders is required
     for any waiver (of compliance with certain provisions of this Indenture or
     certain defaults hereunder and their consequences) provided for in this
     Indenture, or reduce the requirements of Section 1604 for quorum or voting,
     or

          (3) modify any of the provisions of this Section or Section 513,
     except to increase any such percentage or to provide that certain other
     provisions of this Indenture cannot be modified or waived without the
     consent of the Holder of each Outstanding Security affected thereby.

     A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which shall have been included expressly and solely
for the benefit of one or more particular series of Securities, or which
modifies the rights of the Holders of Securities of such

                                      -66-
<PAGE>
 
series with respect to such covenant or other provision, shall be deemed not to
affect the rights under this Indenture of the Holders of Securities of any other
series.

     It shall not be necessary for any Act of Holders of Securities under this
Section to approve the particular form of any proposed supplemental indenture,
but it shall be sufficient if such Act shall approve the substance thereof.

Section 903.  Execution of Supplemental Indentures.
              ------------------------------------ 

     As a condition to executing, or accepting the additional trusts created by,
any supplemental indenture permitted by this Article Nine or the modifications
thereby of the trust created by this Indenture, the Trustee shall be entitled to
receive, and (subject to Section 315 of the Trust Indenture Act) shall be fully
protected in relying upon, an Opinion of Counsel stating that the execution of
such supplemental indenture is authorized or permitted by this Indenture and an
Officers' Certificate stating that all conditions precedent to the execution of
supplemental indenture have been fulfilled.  The Trustee may, but shall not be
obligated to, enter into any such supplemental indenture which affects the
Trustee's own rights, duties or immunities under this Indenture or otherwise.

Section 904.  Effect of Supplemental Indentures.
              --------------------------------- 

     Upon the execution of any supplemental indenture under this Article, this
Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of a Security theretofore or thereafter authenticated and delivered hereunder
and of any Coupon appertaining thereto shall be bound thereby.

Section 905.  Reference in Securities to Supplemental Indentures.
              -------------------------------------------------- 

     Securities of any series authenticated and delivered after the execution of
any supplemental indenture pursuant to this Article may, and shall if required
by the Trustee, bear a notation in form approved by the Trustee as to any matter
provided for in such supplemental indenture.  If the Company shall so determine,
new Securities of any series so modified as to conform, in the opinion of the
Trustee and the Company, to any such supplemental indenture may be prepared and
executed by the Company, and such securities authenticated and delivered by the
Trustee in exchange for Outstanding Securities of such series.

Section 906.  Conformity with Trust Indenture Act.
              ----------------------------------- 

     Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act as then in effect.

                                      -67-
<PAGE>
 
                                  ARTICLE TEN

                                   COVENANTS

Section 1001.  Payment of Principal, Any Premium, Interest and Additional
               ----------------------------------------------------------
Amounts.
- ------- 

     The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of, any premium
and interest on and any Additional Amounts with respect to the Securities of
each series in accordance with the terms thereof, any Coupons appertaining
thereto and this Indenture.  Any interest due on any Bearer Security on or
before the Maturity thereof, and any Additional Amounts payable with respect to
such interest, shall be payable only upon presentation and surrender of the
Coupons appertaining thereto for such interest as they severally mature.

Section 1002.  Maintenance of Office or Agency.
               ------------------------------- 

     The Company shall maintain in each Place of Payment for any series of
Securities, an Office or Agency where Securities of such series (but not Bearer
Securities, except as otherwise provided below, unless such Place of Payment is
located outside the United States) may be presented or surrendered for payment,
where Securities of such series may be surrendered for registration of transfer
or exchange, where Registered Securities may be surrendered for conversion,
where Bearer Securities may be surrendered for conversion in the circumstances
described below (and not otherwise) and where notices and demands to or upon the
Company in respect of the Securities of such series relating thereto and this
Indenture may be served.  If Securities of a series are issuable as Bearer
Securities, the Company shall maintain, subject to any laws or regulations
applicable thereto, an Office or Agency in a Place of Payment and Place of
Conversion for such series which is located outside the United States where
Securities of such series and any Coupons appertaining thereto,  may be
presented and surrendered for payment or conversion; provided, however, that if
                                                     --------  -------         
the Securities of such series are listed on the London Stock Exchange or the
Luxembourg Stock Exchange or any other stock exchange located outside the United
States and such stock exchange shall so require, the Company shall maintain a
Paying Agent and a Conversion Agent in London, Luxembourg or any other required
city located outside the United States, as the case may be, so long as the
Securities of such series are listed on such exchange.  The Company will give
prompt written notice to the Trustee of the location, and any change in the
location, of such Office or Agency.  If at any time the Company shall fail to
maintain any such required Office or Agency or shall fail to furnish the Trustee
with the address thereof, such presentations, surrenders, notices and demands
may be made or served at the Corporate Trust Office of the Trustee, except that
Bearer Securities of such series and any Coupons appertaining thereto may be
presented and surrendered for payment or conversion at the place specified for
that purpose with respect to such Securities as provided in or pursuant to this
Indenture, and the Company hereby appoint the Trustee as its agent to receive
all such presentations, surrenders, notices and demands.

     Except as otherwise provided in or pursuant to this Indenture, no payment
of principal, premium, interest or Additional Amounts with respect to Bearer
Securities (including payments by reason of the conversion thereof) shall be
made at any Office or Agency in the United States or by check mailed to any
address in the United States

                                      -68-
<PAGE>
 
or by transfer to an account maintained with a bank located in the United
States; provided, however, that if amounts owing with respect to any Bearer
        --------  -------
Securities shall be payable in Dollars, payment of principal of, any premium or
interest on and any Additional Amounts with respect to any such Security may be
made, and any Bearer Securities may be surrendered for conversion, at the
Corporate Trust Office of the Trustee or any Office or Agency designated by the
Company in the Borough of Manhattan, The City of New York, if (but only if)
payment of the full amount of such principal, premium, interest or Additional
Amounts, or surrender of Bearer Securities for conversion, at all offices
outside the United States maintained for such purpose by the Company in
accordance with this Indenture is illegal or effectively precluded by exchange
controls or other similar restrictions on the full payment or receipt of such
amounts in Dollars as determined by the Company, or on surrender of any Bearer
Securities for conversion.

     The Company may also from time to time designate one or more other Offices
or Agencies where the Securities of one or more series, may be presented or
surrendered for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall in
              --------  -------                                                 
any manner relieve the Company of its obligation to maintain an Office or Agency
in each Place of Payment and Place of Conversion for Securities of any series
for such purposes.  The Company shall give prompt written notice to the Trustee
of any such designation or rescission and of any change in the location of any
such other Office or Agency.  Unless otherwise provided in or pursuant to this
Indenture, the Company hereby designates as the Place of Payment and the Place
of Conversion for each series of Securities (other than those issued as Bearer
Securities), the Borough of Manhattan, The City of New York, and initially
appoint the Corporate Trust Office of the Trustee as the Company's Office or
Agency in the Borough of Manhattan, The City of New York for such purpose.  The
Company may subsequently appoint a different Office or Agency in the Borough of
Manhattan, The City of New York for the Securities of any series.  Unless
otherwise provided in or pursuant to this Indenture, the Company hereby
designates as the Place of Payment and the Place of Conversion for Bearer
Securities, to be London, England, and initially appoint the office of the
Trustee in London as the Office or Agency for such purpose and initially appoint
the office of the Trustee in London as its Paying Agent and Conversion Agent in
London.

          If at any time the Company shall fail to maintain any such required
office or agency, or shall fail to furnish the Trustee with the address thereof,
presentations and surrenders may be made and notices and demands may be served
on the Corporate Trust Office of the Trustee, except that Bearer Securities and
Coupons may be presented and surrendered for payment and conversion to the
Paying Agent in London at its office in the City of London, England or other
Paying Agent or Conversion Agent outside the United States, and the Company
hereby appoints the Paying Agent in London as its agent to receive such
respective presentations, surrenders, notices and demands.

Section 1003.  Money for Securities Payments to be Held in Trust.
               ------------------------------------------------- 

     If the Company shall at any time act as its own Paying Agent with respect
to any series of Securities, it shall, on or before each due date of the
principal of, any premium or interest on or Additional Amounts with respect to
any of the Securities of such series, segregate and hold in

                                      -69-
<PAGE>
 
trust for the benefit of the Persons entitled thereto a sum in Dollars
sufficient to pay the principal or any premium, interest or Additional Amounts
so becoming due until such sums shall be paid to such Persons or otherwise
disposed of as herein provided, and shall promptly notify the Trustee of its
action or failure so to act.

     Whenever the Company shall have one or more Paying Agents for any series of
Securities, it shall, on or prior to each due date of the principal of, any
premium or interest on or any Additional Amounts with respect to any Securities
of such series, deposit with any Paying Agent a sum in Dollars sufficient to pay
the principal or any premium, interest or Additional Amounts so becoming due,
such sum to be held in trust for the benefit of the Persons entitled thereto,
and (unless such Paying Agent is the Trustee) the Company will promptly notify
the Trustee of its action or failure so to act.

     The Company shall cause each Paying Agent for any series of Securities
other than the Trustee to execute and deliver to the Trustee an instrument in
which such Paying Agent shall agree with the Trustee, subject to the provisions
of this Section, that such Paying Agent shall:

          (1) hold all sums held by it for the payment of the principal of, any
     premium or interest on or any Additional Amounts with respect to Securities
     of such series in trust for the benefit of the Persons entitled thereto
     until such sums shall be paid to such Persons or otherwise disposed of as
     provided in or pursuant to this Indenture;

          (2) give the Trustee notice of any default by the Company (or any
     other obligor upon the Securities of such series) in the making of any
     payment of the principal of, any premium or interest on or any Additional
     Amounts with respect to the Securities of such series;

          (3) at any time during the continuance of any such default, upon the
     written request of the Trustee, forthwith pay to the Trustee all sums so
     held in trust by such Paying Agent; and

          (4) indemnify the Trustee for any loss, cost, liability, or expense
     caused by any error, act or omission of the Paying Agent.

     The Company may at any time, for the purpose of obtaining the satisfaction
and discharge of this Indenture or for any other purpose, pay, or by Company
Order of the Company direct any Paying Agent to pay, to the Trustee all sums
held in trust by the Company or such Paying Agent, such sums to be held by the
Trustee upon the same terms as those upon which such sums were held by the
Company or such Paying Agent; and, upon such payment by any Paying Agent to the
Trustee, such Paying Agent shall be released from all further liability with
respect to such sums.

     Except as otherwise provided herein or pursuant hereto, any money deposited
with the Trustee or any Paying Agent, or then held by the Company in trust for
the payment of the principal of, any premium or interest on or any Additional
Amounts with respect to any Security of any series or any Coupon appertaining
thereto and remaining unclaimed for two years after 

                                      -70-
<PAGE>
 
such principal or any such premium or interest or any such Additional Amounts
shall have become due and payable shall, unless otherwise required by mandatory
provisions of applicable escheat or abandoned or unclaimed property law, be paid
to the Company on Company Request, or (if then held by the Company) shall be
discharged from such trust; and the Holder of such Security or any Coupon
appertaining thereto shall thereafter, as an unsecured general creditor, look
only to the Company for payment thereof, and all liability of the Trustee or
such Paying Agent with respect to such trust money, and all liability of the
Company as trustee thereof, shall thereupon cease; provided, however, that the
                                                   --------  -------
Trustee or such Paying Agent, before being required to make any such repayment,
may at the expense of the Company cause to be published once, in an Authorized
Newspaper in each Place of Payment for such series or to be mailed to Holders of
Registered Securities of such series, or both, notice that such money remains
unclaimed and that, after a date specified therein, which shall not be less than
30 days from the date of such publication or mailing, any unclaimed balance of
such money then remaining will be repaid to the Company.

Section 1004.  Additional Amounts.
               ------------------ 

     Except as otherwise provided in or pursuant to this Indenture or the
Securities of any series, all payments of principal of, premium, if any, and
interest on Securities of any series to a Holder thereof who is not a United
States person shall be made without set-off, counterclaim, fees, liabilities or
similar deductions (including payments on redemption and repayment), and free
and clear of, and without deduction or withholding for, taxes, levies, imposts,
duties, assessments, charges or fees of whatsoever nature now or hereafter
imposed, levied, collected, deducted, withheld or assessed by or on behalf of
the Government of the United States, or any state or other political subdivision
or taxing authority thereof or therein ("Taxes").  Except as otherwise provided
                                         -----                                 
in or pursuant to this Indenture or the Securities of any series, if the Company
or any agent of the Company is required by law or regulation to make any
deduction or withholding for or on account of Taxes, the Company shall pay such
additional amounts ("Additional Amounts") as shall be necessary in order that
                     ------------------                                      
the net amounts received by the Holders of the Securities of any series who are
not United States persons after such deduction or withholding shall equal the
amount that would have been receivable thereunder in the absence of such
deduction or withholding, except that no such Additional Amounts shall be
payable on account of:

         (a) any Tax which would not have been so imposed but for (i) the
  existence of any present or former connection between such Holder (or between
  a fiduciary, settlor, beneficiary, member, shareholder of or possessor of a
  power over such Holder, if such Holder is an estate, a trust, a partnership or
  a corporation) and the United States or any political subdivision or taxing
  authority thereof or therein, including, without limitation, such Holder (or
  such fiduciary, settlor, beneficiary, member, shareholder or possessor) being
  or having been a citizen or resident of the United States or treated as a
  resident thereof, or being or having been engaged in trade or business or
  present therein, or having had a permanent establishment therein, (ii) such
  Holder's present or former status as a personal holding company, a foreign
  personal holding company with respect to the United States, a controlled
  foreign corporation, a passive foreign investment company, or a foreign
  private foundation or foreign tax exempt entity for United States tax
  purposes, or a corporation which accumulates 

                                      -71-
<PAGE>
 
  earnings to avoid United States Federal income tax, or (iii) such holder's
  status as a bank extending credit pursuant to a loan agreement entered into in
  the ordinary course of business;

         (b) any Tax which would not have been so imposed but for the
  presentation by the Holder of such Security or any Coupon appertaining thereto
  for payment on a date more than 15 days after the date on which such payment
  became due and payable or the date on which payment thereof is duly provided
  for, whichever occurs later;

         (c) any estate, inheritance, gift, sales, transfer, personal property
  or similar Tax;

         (d) any Tax which would not have been imposed but for the failure to
  comply with any certification, identification or other reporting requirements
  concerning the nationality, residence, identity or connection with the United
  States of the Holder or beneficial owner of such Security or any Coupon
  appertaining thereto, if compliance is required by statute or by regulation or
  ruling of the United States Treasury Department as a precondition to exemption
  from such Tax;

         (e) any Tax which is payable otherwise than by deduction or withholding
  from payments of principal of, premium, if any, or interest on such Security;

         (f) any Tax imposed as a result of a Person's past or present actual or
  constructive ownership, including by virtue of the right to convert
  Securities, of 10% or more of the total combined voting power of all classes
  of stock of the Company entitled to vote;

         (g) any Tax required to be withheld by any Paying Agent from any
  payment of the principal of, premium, if any, or interest on such Security, if
  such payment can be made without such withholding by any other Paying Agent in
  Western Europe;

         (h) any Tax imposed on a Holder that is a partnership or a fiduciary,
  but only to the extent that any beneficial owner or member of the partnership
  or beneficiary or settlor with respect to the fiduciary would not have been
  entitled to the payment of Additional Amounts had the beneficial owner,
  member, beneficiary or settlor directly received its beneficial or
  distributive share of payments on such Security;

         (i) any Tax which would not have been imposed but for the fact that
  such Security constitutes a "United States real property interest," as defined
  in Section 897(c)(1) of the Internal Revenue Code and the regulations
  thereunder, with respect to the beneficial owner of such Security; or

         (j) any combination of items (a), (b), (c), (d), (e), (f), (g), (h) and
  (i).

         Notwithstanding the foregoing, if and so long as a certification,
identification or other information reporting requirement referred to in the
third paragraph of Section 1102 of this Indenture would be fully satisfied by
payment of a backup withholding tax or similar charge, the Company may elect, by
so stating in the Determination Notice (as hereinafter defined), to have

                                      -72-
<PAGE>
 
the provisions of this paragraph apply in lieu of redeeming the Security
pursuant to such Section 1102. In such event, the Company will pay as Additional
Amounts such amounts as may be necessary so that every net payment made,
following the effective date of such requirements, outside the United States by
the Company or any Paying Agent of principal and premium, if any, due in respect
of a Security, or interest represented by any Coupon, the beneficial owner of
which is not a United States person (but without any requirement that the
nationality, residence or identity of such beneficial owner be disclosed to the
Company, any Paying Agent or any governmental authority), after deduction or
withholding for or on account of such backup withholding tax or similar charge,
other than a backup withholding tax or similar charge which is (a) the result of
a certification, identification or information reporting requirement described
in the first parenthetical clause of such third paragraph of Section 1102, (b)
imposed as a result of the fact that the Company or any Paying Agent has actual
knowledge that the beneficial owner of the Security or such Coupon is within the
category of Persons described in clause (a) of the preceding paragraph or (c)
imposed as a result of presentation of the Security or such Coupon for payment
more than 15 days after the date on which such payment becomes due and payable
or on which payment thereof is duly provided for, whichever occurs later, will
not be less than the amount provided for in the Security or such Coupon to be
then due and payable.

         Except as specifically provided in this Indenture, the Company shall
not be required to make any payment with respect to any Taxes.

     If the Company or any successor to the Company under this Indenture shall
be incorporated under the laws of a jurisdiction other than the United States,
the Company or its successor will pay and shall provide notice to the Trustee of
the payment of, such additional amounts ("Other Additional Amounts") as may be
                                          ------------------------            
necessary in order that every net payment on each Security, after withholding
for or on account of any present or future tax, assessment or other governmental
charge imposed upon or as a result of such payment by such other jurisdiction
(or any political subdivision or taxing authority thereof or therein), will be
not less than the amount provided for in such Security to be then due and
payable; provided, however, that (i) the Other Additional Amounts payable to a
         --------  -------                                                    
Holder of a Security will be reduced to the extent that such withholding reduces
any tax liability to which such Holder of the Security was and is subject both
prior to and after such incorporation in another jurisdiction and (ii) the
exceptions listed in the third preceding paragraph shall apply, substituting for
the United States the relevant jurisdiction that imposes the tax giving rise to
the payment of Other Additional Amounts.

     Whenever in this Indenture there is mentioned, in any context, the payment
of the principal of or any premium or interest on, or in respect of, any
Security of any series or any Coupon or the net proceeds received on the sale or
exchange of any Security of any series, such mention shall be deemed to include
mention of the payment of Additional Amounts provided by the terms of this
Indenture or by the terms of such series established hereby or pursuant hereto
to the extent that, in such context, Additional Amounts are, were or would be
payable in respect thereof pursuant to such terms, and express mention of the
payment of Additional Amounts (if applicable) in any provision hereof shall not
be construed as excluding Additional Amounts in those provisions hereof where
such express mention is not made.

                                      -73-
<PAGE>
 
     Except as otherwise provided in or pursuant to this Indenture or the
Securities of any series, if the Securities of a series provide for the payment
of Additional Amounts, at least 10 days prior to each date of payment of
principal or interest if any Additional Amounts will be payable in connection
therewith, the Company shall furnish to the Trustee and the principal Paying
Agents, if other than the Trustee, an Officers' Certificate which shall specify
by country the amount, if any, required to be withheld on such payments to such
Holders of Securities or Coupons, and the Company agrees to pay to the Trustee
or such Paying Agent the Additional Amounts required hereby or by the terms of
such Securities.  The Company covenants to indemnify the Trustee and any Paying
Agent and other officers, directors, employees and agents for, and to hold them
harmless against, any loss, liability or expense reasonably incurred without
negligence or bad faith on their part arising out of or in connection with
actions taken or omitted by any of them in reliance on any Officers' Certificate
furnished pursuant to this Section.

Section 1005.  Statement as to Compliance.
               -------------------------- 

     The Company will deliver to the Trustee, within 120 days after the end of
each fiscal year of the Company an Officers' Certificate, stating as to each
signer, that

     (1) a review of the activities of the Company during such year and of
performance under this Indenture has been made under his or her supervision; and

     (2) to the best of his or her knowledge, based on such review, (a) the
Company has fulfilled all its obligations under this Indenture throughout such
year, or, if there has been a material default in the fulfillment of any such
obligation, specifying each such default known to him or her and the nature and
status thereof, and (b) no event has occurred and is continuing which is, or
after notice or lapse of time or both would become, an Event of Default, or, if
such an event has occurred and is continuing, specifying each such event known
to him or her and the nature and status thereof.

Section 1006.  Corporate Existence.
               ------------------- 

     Subject to Article Eight, the Company will do or cause to be done all
things necessary to preserve and keep in full force and effect its corporate
existence.

                                      -74-
<PAGE>
 
                                ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

Section 1101.  Applicability of Article.
               ------------------------ 

     Redemption of Securities of any series at the option of the Company as
permitted or required in or pursuant to this Indenture or by the terms of such
Securities shall be made in accordance with the terms of this Indenture or such
Securities and (except as otherwise provided herein or pursuant hereto) this
Article Eleven.

Section 1102.  Election to Redeem; Notice to Trustee.
               ------------------------------------- 

     The election of the Company to redeem any Securities shall be evidenced by
or pursuant to a Board Resolution.  In case of any redemption at the election of
the Company of the Securities of any series, the Company shall, at least 75 days
prior to the Redemption Date fixed by the Company (unless a shorter notice shall
be satisfactory to the Trustee), notify the Trustee of such Redemption Date and
of the principal amount of Securities of such series to be redeemed.

         In addition, notwithstanding the above, if as a result of a Tax Law
Change, the Company has or will become obligated to pay to the Holder of any
Security or Coupon Additional Amounts, and such obligation cannot be avoided by
the Company taking reasonable measures available to it, then the Company may, at
its option, redeem the Tax Affected Securities as a whole, but not in part, upon
not less than 20 nor more than 60 days' notice to the Holders prior to the
Redemption Date therefor, at a Redemption Price equal to 100% of the principal
amount plus interest accrued to the Redemption Date, and any Additional Amounts
then payable; provided that (i) no such notice of redemption shall be given
              -------- ----                                                
earlier than 90 days prior to the earliest date on which the Company would be
obligated to pay any such Additional Amounts were a payment in respect of the
Tax Affected Securities then due and (ii) at the time such notice of redemption
is given, such obligation to pay such Additional Amounts remains in effect.
Prior to the publication of any notice of redemption pursuant to this paragraph,
the Company shall deliver to the Trustee (a) an Officers' Certificate stating
that the Company is entitled to effect such redemption and setting forth a
statement of facts showing that the conditions precedent to the right of the
Company so to redeem have occurred and (b) an Opinion of Counsel selected by the
Company to the effect that the Company has or will become obligated to pay such
Additional Amounts as a result of such Tax Law Change.  The Company's right to
redeem the Tax Affected Securities shall continue as long as the Company is
obligated to pay such Additional Amounts, notwithstanding that the Company shall
have made payments of Additional Amounts specified in Section 1004.

     In addition, if the Company determines, based upon an Opinion of Counsel,
that, as a result of a Tax Law Change, any payment made outside the United
States by the Company or any of its Paying Agents of the full amount of
principal, premium, if any, or interest due with respect to any Bearer Security
or Coupon appertaining thereto would be subject to any certification,
identification or other information reporting requirement of any kind, the
effect of which requirement is the disclosure to the Company, any Paying Agent
or any governmental authority

                                      -75-
<PAGE>
 
of the nationality, residence or identity of a beneficial owner of such Bearer
Security or Coupon who is not a United States person (other than such a
requirement (a) which would not be applicable to a payment made by the Company
or any one of its Paying Agents (i) directly to the beneficial owner or (ii) to
any custodian, nominee or other agent of the beneficial owner, (b) which can be
satisfied by the custodian, nominee or other agent certifying that such
beneficial owner is not a United States person, provided that, in each case
                                                -------- ----
referred to in clauses (a) (ii) and (b), payment by such custodian, nominee or
agent to such beneficial owner is not otherwise subject to any such requirement,
or (c) which would not be applicable but for the fact that such Bearer Security
constitutes a "United States real property interest," as defined in Section
897(c)(1) of the Internal Revenue Code, with respect to the beneficial owner of
such Bearer Security), the Company at its election will either (x) redeem the
Bearer Securities, as a whole but not in part, upon not less than 20 nor more
than 60 days' notice prior to the Redemption Date, at a Redemption Price equal
to 100% of the principal amount thereof plus interest accrued to the Redemption
Date and any Additional Amounts, or (y) if and so long as the certification,
identification or other information reporting requirement referred to above
would be fully satisfied by payment of a backup withholding tax or similar
charge, pay the Holder the Additional Amounts specified in Section 1004. The
Company will make such determination and election and notify the Trustee and the
Paying Agent in London, England thereof in writing as soon as practicable, and
the Trustee will promptly give notice of such determination in the manner
provided in Section 106 (the "Determination Notice"), in each case stating the
                              ------------- ------
effective date of such certification, identification or information reporting
requirement, whether the Company will redeem the Bearer Securities or will pay
the Additional Amounts specified in the second paragraph of Section 1004 and (if
applicable) the last date by which the redemption of the Bearer Securities must
take place. If the Company elects to redeem the Bearer Securities pursuant to
clause (x) above, such redemption shall take place on a date, not later than one
year after the publication of the Determination Notice, as the Company elects by
notice in writing to the Trustee and the Paying Agent in London at least 75 days
before the Redemption Date, unless shorter notice is acceptable to the Trustee.
Notwithstanding the foregoing, the Company will not so redeem the Bearer
Securities if the Company, based upon an Opinion of Counsel which counsel shall
be reasonably acceptable to the Trustee, subsequently determines, not less than
20 days prior to the Redemption Date, that subsequent payments would not be
subject to any such requirement, in which case the Company will notify the
Trustee in writing of its determination not to so redeem the Securities, and the
Trustee will promptly give notice to the Holders of the Bearer Securities of
that determination and any earlier redemption notice will thereupon be revoked
and of no further effect. If the Company elects as provided in clause (y) above
to pay Additional Amounts, the Company may, as long as the Company is obligated
to pay such Additional Amounts, subsequently redeem the Bearer Securities, at
any time, as a whole but not in part, upon not less than 20 nor more than 60
days' notice prior to the Redemption Date, at a Redemption Price equal to 100%
of the principal amount thereof plus interest accrued to the Redemption Date,
and any Additional Amounts.


Section 1103.  Selection by Trustee of Securities to be Redeemed.
               ------------------------------------------------- 

     If any Securities of any series are to be redeemed in part, the particular
Securities to be redeemed shall be selected not more than 60 days prior to the
Redemption Date by the Trustee

                                      -76-
<PAGE>
 
from the Outstanding Securities of such series not previously called for
redemption, in compliance with the requirements of the principal U.S. securities
exchange, if any, on which the Securities are listed, or, if the Securities are
not so listed, on a pro rata basis, by lot or such other method as the Trustee
shall deem fair and appropriate, under circumstances intended not to
discriminate between Registered and Bearer Securities to be redeemed, and which
may provide for the selection for redemption of portions of the principal amount
of Registered Securities of such series; provided, however, that no such partial
                                         --------  -------
redemption shall reduce the portion of the principal amount of a Registered
Security of such series not redeemed to less than the minimum denomination for a
Security of such series established herein or pursuant hereto. The Trustee shall
have no liability in connection with any selection of securities to redemption
made in good faith and without negligence.

     If any Registered Security selected for partial redemption, which is
convertible by the terms of such Security established pursuant to Section 301,
is converted in part before termination of the conversion right with respect to
the portion of the Security so selected, the converted portion of such Security
shall be deemed (so far as may be) to be the portion selected for redemption.
Securities which have been converted during a selection of Securities to be
redeemed may be treated by the Trustee as Outstanding for the purpose of such
selection.

     The Trustee shall promptly notify the Company and the Security Registrar
(if other than itself) in writing of the Securities selected for redemption and,
in the case of any Securities selected for partial redemption, the principal
amount thereof to be redeemed.

     For all purposes of this Indenture, unless the context otherwise requires,
all provisions relating to the redemption of Securities shall relate, in the
case of any Securities redeemed or to be redeemed only in part, to the portion
of the principal of such Securities which has been or is to be redeemed.

Section 1104.  Notice of Redemption.
               -------------------- 

     Notice of redemption shall be given by the Trustee in the manner provided
in Section 106, not less than 20 nor more than 60 days prior to the Redemption
Date, unless a different period is specified in the Securities to be redeemed.
All such redemption notices (except, in the case of a redemption specified in
the penultimate paragraph of Section 1102) shall be irrevocable.  Failure to
give notice by mailing in the manner herein provided to the Holder of any
Registered Securities designated for redemption as a whole or in part, or any
defect in the notice to any such Holder, shall not affect the validity of the
proceedings for the redemption of any other Securities or portion thereof.

     Any notice that is mailed to the Holder of any Registered Securities in the
manner herein provided shall be conclusively presumed to have been duly given,
whether or not such Holder receives the notice.

     All notices of redemption shall identify the Securities to be redeemed and
shall state:

     (1)  the Redemption Date,

                                      -77-
<PAGE>
 
     (2) the Redemption Price, or, if the Redemption Price is not then
determinable, the formula pursuant to which the Redemption Price will be
determined, and accrued interest, if any,

     (3) if less than all Outstanding Securities of any series are to be
redeemed, the identification (and, in the case of partial redemption, the
principal amount) of the particular Security or Securities to be redeemed,

     (4) in case any Security is to be redeemed in part only, the notice which
relates to such Security shall state that on and after the Redemption Date, upon
surrender of such Security, the Holder of such Security will receive, without
charge, a new Security or Securities of authorized denominations for the
principal amount thereof remaining unredeemed,

     (5) that, on the Redemption Date, the Redemption Price shall become due and
payable upon each such Security or portion thereof to be redeemed, and, if
applicable, that interest thereon shall cease to accrue on and after said date,

     (6) if applicable, the Conversion Price, the date on which the right to
convert the Securities to be redeemed will terminate and the places where such
Securities, together with all unmatured Coupons and any matured Coupons in
default appertaining thereto, may be surrendered for conversion,

     (7) the place or places where such Securities, together (in the case of
Bearer Securities) with all Coupons appertaining thereto, if any, maturing after
the Redemption Date, are to be surrendered for payment of the Redemption Price
and any accrued interest and Additional Amounts pertaining thereto,

     (8) that the redemption is for a sinking fund, if such is the case,

     (9) that, unless otherwise specified in such notice, Bearer Securities of
any series, if any, surrendered for redemption must be accompanied by all
Coupons maturing subsequent to the date fixed for redemption or the amount of
any such missing Coupon or Coupons will be deducted from the Redemption Price,
unless security or indemnity satisfactory to the Company, the Trustee and any
Paying Agent is furnished,

     (10) if Bearer Securities of any series are to be redeemed and any
Registered Securities of such series are not to be redeemed, and if such Bearer
Securities may be exchanged for Registered Securities not subject to redemption
on the Redemption Date pursuant to Section 305 or otherwise, the last date, as
determined by the Company, on which such exchanges may be made, and

     (11) the CUSIP number, ISIN number or the Euroclear or the Cedel reference
numbers of such Securities, if any (or any other numbers used by a Depository or
Common Depository to identify such Securities).

                                      -78-
<PAGE>
 
     Notice of redemption of Securities to be redeemed at the election of the
Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

Section 1105.  Deposit of Redemption Price.
               --------------------------- 

     On or prior to 10:00 a.m., Eastern Time, on any Redemption Date, the
Company shall deposit, in immediately available funds, with respect to the
Securities of any series called for redemption pursuant to Section 1104, with
the Trustee or with a Paying Agent (or, if the Company is acting as its own
Paying Agent, segregate and hold in trust as provided in Section 1003) an amount
of money in Dollars sufficient to pay the Redemption Price of, and (except if
the Redemption Date shall be an Interest Payment Date, unless otherwise
specified pursuant to Section 301 for or in the Securities of such series) any
accrued interest on and Additional Amounts with respect thereto, all such
Securities or portions thereof which are to be redeemed on that date.

     If any Security called for redemption, which is convertible by the terms of
such Security established pursuant to Section 301, is converted, any money
deposited with the Trustee or with a Paying Agent or so segregated and held in
trust for the redemption of such Security shall (subject to any right of the
Holder of such Security or any predecessor Security to receive interest as
provided in Section 307) be paid to the Company on Company Request or, if then
held by the Company, shall be discharged from such trust.

Section 1106.  Securities Payable on Redemption Date.
               ------------------------------------- 

     Notice of redemption having been given as aforesaid, the Securities so to
be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest and the Coupons for such
interest appertaining to any Bearer Securities so to be redeemed, except to the
extent provided below, shall be void.  Upon surrender of any such Security for
redemption in accordance with said notice, together with all Coupons, if any,
appertaining thereto maturing after the Redemption Date, such Security shall be
paid by the Company at the Redemption Price, together with any accrued interest
and Additional Amounts to the Redemption Date; provided, however, that, except
                                               --------  -------              
as otherwise provided in or pursuant to this Indenture or the Bearer Securities
of such series, installments of interest on Bearer Securities whose Stated
Maturity is on or prior to the Redemption Date shall be payable only upon
presentation and surrender of Coupons for such interest (at an Office or Agency
located outside the United States except as otherwise provided in Section 1002),
and provided, further, that, except as otherwise specified in or pursuant to
    --------  -------                                                       
this Indenture or the Registered Securities of such series, installments of
interest on Registered Securities whose Stated Maturity is on or prior to the
Redemption Date shall be payable to the Holders of such Securities, or one or
more Predecessor Securities, registered as such at the close of business on the
Regular Record Dates therefor according to their terms and the provisions of
Section 307.

                                      -79-
<PAGE>
 
     If any Bearer Security surrendered for redemption shall not be accompanied
by all appurtenant Coupons maturing after the Redemption Date, such Security may
be paid after deducting from the Redemption Price an amount equal to the face
amount of all such missing Coupons, or the surrender of such missing Coupon or
Coupons may be waived by the Company and the Trustee if there be furnished to
them such security or indemnity as they may require to save each of them and any
Paying Agent harmless.  If thereafter the Holder of such Security shall
surrender to the Trustee or any Paying Agent any such missing Coupon in respect
of which a deduction shall have been made from the Redemption Price, such Holder
shall be entitled to receive the amount so deducted; provided, however, that any
                                                     --------  -------          
interest or Additional Amounts represented by Coupons shall be payable only upon
presentation and surrender of those Coupons at an Office or Agency for such
Security located outside of the United States except as otherwise provided in
Section 1002.

     If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal and any premium, until paid, shall bear
interest from the Redemption Date at the rate prescribed therefor in the
Security and each Security shall remain convertible (if applicable) until the
principal of such Security (or portion thereof, as the case may be) shall have
been paid or duly provided for.

Section 1107.  Securities Redeemed in Part.
               --------------------------- 

     Any Security which is to be redeemed only in part shall be surrendered at
any applicable Office or Agency for such Security (with, if the Company or the
Trustee so requires, due endorsement by, or a written instrument of transfer in
form satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or his attorney duly authorized in writing) and the Company shall
execute, and the Trustee shall authenticate and deliver to the Holder of such
Security without service charge, a new Security or Securities of the same
series, containing identical terms and provisions, of any authorized
denomination as requested by such Holder in aggregate principal amount equal to
and in exchange for the unredeemed portion of the principal of the Security so
surrendered.  If a Security in global form is so surrendered, the Company shall
execute, and the Trustee shall authenticate and deliver to the U.S. Depository
or other Depository or Common Depository for such Security in global form as
shall be specified in the Company Order with respect thereto to the Trustee,
without service charge, a new Security in global form in a denomination equal to
and in exchange for the unredeemed portion of the principal of the Security in
global form so surrendered.

                                 ARTICLE TWELVE

                            CONVERSION OF SECURITIES

Section 1201.  Conversion Privilege and Conversion Price.
               ----------------------------------------- 

     Conversion of Securities of any series at the option of the Holder thereof
as permitted by the terms of such Securities shall be made in accordance with
the terms of such Securities and (except as otherwise provided herein or
pursuant hereto) this Article Twelve.  Each reference in this Article Twelve to
"a Security" or "the Securities" refers to the Securities of the particular

                                      -80-
<PAGE>
 
series that are convertible into shares of Common Stock.  At the option of the
Holder any Security other than the temporary global Bearer Security may be
converted into fully paid and nonassessable shares (calculated as to each
conversion to the nearest 1/100th of a share) of Common Stock of the Company at
the Conversion Price (as defined below) in effect at the time of conversion.
The period for conversion shall be set forth in the terms of the Securities.  In
case a Security or portion thereof is called for redemption or is delivered for
repayment, such conversion right in respect of the Security or portion so called
or delivered shall expire at the close of business on the fifth Business Day
preceding the Redemption Date or the second Business Day preceding a repayment
on the Securities Repayment Date (as set forth in Article Fifteen), as the case
may be, unless the Company defaults in making the payment due upon redemption or
repayment, as the case may be.


     The price at which shares of Common Stock shall be delivered upon
conversion (herein called the "Conversion Price") shall be as set forth in the
                               ----------------                               
terms of the Securities.  The Conversion Price shall be adjusted in certain
instances as provided in this Article Twelve.



     Upon presentment for conversion of any Securities pursuant to this Section
1201, the applicable Conversion Agent shall that day notify the Company of such
presentment.  The Company shall deliver to such Holder, through the Conversion
Agent, as promptly as practicable on or after the Conversion Date, the
certificates representing the number of shares of Common Stock to be delivered,
and cash in lieu of any fractional shares.  No payment or adjustment shall be
made upon any conversion on account of any dividends on the Common Stock issued
upon conversion.


Section 1202.  Exercise of Conversion Privilege
               --------------------------------
 .

     In order to exercise the conversion privilege, the Holder of any Definitive
Security to be converted shall surrender such Security, duly endorsed or
assigned to the Company or in blank (in the case of any Registered Security), at
any applicable Place of Conversion, accompanied by a duly signed and completed
conversion notice substantially in the form attached hereto as Exhibit B stating
                                                               ---------        
that the Holder elects to convert such Security or, if less than the entire
principal amount thereof is to be converted, the portion thereof to be
converted.  Each Bearer Security surrendered for conversion must be surrendered
together with all Coupons appertaining thereto that mature after the Conversion
Date.  If any Bearer Security surrendered for conversion shall not be
accompanied by all such appurtenant Coupons, the surrender of any or all of such
missing Coupons may be waived by the Company and the Trustee, if there be
furnished to them such security or indemnity as they may require to save each of
them and any Paying Agent harmless.  Matured Coupons not in default (including
Coupons maturing on the Conversion Date) will be payable against surrender
thereof, and matured Coupons previously surrendered and in default will continue
to be payable, notwithstanding the exercise of the right of conversion by the
Holder of the Security to which the Coupon appertains.  Accrued interest from
the immediately preceding Interest Payment Date until the Conversion Date (and
Additional Amounts, if any, thereon) will be paid, through the Paying Agent, in
the same manner as regular payments of interest and as provided in Section 307,
within five Business Days after the Conversion Date.  The Company's delivery to
the Holder of the fixed number of shares of

                                      -81-
<PAGE>
 
Common Stock into which a Definitive Security is convertible will be deemed to
satisfy the Company's obligation to pay the principal amount of the Security.

     Definitive Securities shall be deemed to have been converted immediately
prior to the close of business on the day of surrender of such Securities for
conversion (accompanied by a duly signed and completed conversion notice as
contemplated above) in accordance with the foregoing provisions, and at such
time the rights of the Holders of such Securities as Holders shall cease, and
the Person or Persons entitled to receive the Common Stock issuable upon
conversion shall be treated for all purposes as the record holder or holders of
such Common Stock at such time.  Subject to Section 1201, as promptly as
practicable on or after the Conversion Date, the Company shall issue and deliver
to the Trustee, for delivery to the Holder, a certificate or certificates for
the number of full shares of Common Stock issuable upon conversion, together
with payment in lieu of any fraction of a share, as provided in Section 1203.

     In the case of any Security which is converted in part only, upon such
partial conversion the Company shall execute and the Trustee shall authenticate
and deliver to the Holder thereof, at the expense of the Company, a new Security
or Securities of authorized denominations in an aggregate principal amount equal
to and in exchange for the unconverted portion of the principal amount of such
Security.  A Security may be converted in part, but only if the principal amount
of such Security to be converted is any integral multiple of U.S. $1,000 and the
principal amount of such security to remain Outstanding after such conversion is
equal to U.S. $1,000 or any integral multiple of $1,000 in excess thereof.

Section 1203.  Fractions of Shares.
               ------------------- 

     No fractional shares of Common Stock shall be issued upon conversion of any
Definitive Security.  If more than one Definitive Security shall be surrendered
for conversion at one time by the same Holder, the number of full shares which
shall be issuable upon conversion thereof shall be computed on the basis of the
aggregate principal amount of the Definitive Securities (or specified portions
thereof) so surrendered.  Instead of any fractional share of Common Stock which
would otherwise be issuable upon conversion of any Definitive Security or
Securities (or specified portions thereof), the Company shall calculate and pay
a cash adjustment in respect of such fraction (calculated to the nearest 1/100th
of a share) in an amount equal to the same fraction of the Closing Price Per
Share at the close of business on the Conversion Date.  Such cash payments
shall, in the case of a conversion of Bearer Securities, be made to an address
outside of the United States.

Section 1204.  Adjustment of Conversion Price.
               ------------------------------ 

     The Conversion Price shall be subject to adjustment from time to time as
follows:

          (1) In case the Company shall pay or make a dividend or other
distribution on any class of capital stock of the Company in shares of Common
Stock, the Conversion Price in effect at the opening of business on the day
following the date fixed for the determination of stockholders entitled to
receive such dividend or other distribution shall be reduced so that the same
shall equal the price determined by multiplying such Conversion Price by a
fraction of

                                      -82-
<PAGE>
 
which the numerator shall be the number of shares of Common Stock outstanding at
the close of business on the date fixed for such determination and the
denominator shall be the sum of such number of shares and the total number of
shares of Common Stock constituting such dividend or other distribution, such
reduction to become effective at the opening of business on the day following
the date fixed for such determination. For the purposes of this paragraph (1),
the number of shares of Common Stock at any time outstanding shall not include
shares held in the treasury of the Company but shall include shares issuable in
respect of scrip certificates issued in lieu of fractions of shares of Common
Stock.

          (2) In case at any time the Company shall issue rights, options or
warrants to all holders of its Common Stock entitling them to subscribe for or
purchase shares of Common Stock at a price per share less than the then current
market price per share (determined as provided in paragraph (6) of this Section)
of the Common Stock on the date fixed for the determination of stockholders
entitled to receive such rights, options or warrants, the Conversion Price in
effect at the opening of business on the day following the date fixed for such
determination shall be reduced so that the same shall equal the price determined
by multiplying such Conversion Price by a fraction of which the numerator shall
be the number of shares of Common Stock outstanding at the close of business on
the date fixed for such determination plus the number of shares of Common Stock
which the aggregate of the offering price of the total number of shares of
Common Stock so offered for subscription or purchase would purchase at such
current market price and the denominator shall be the number of shares of Common
Stock outstanding at the close of business on the date fixed for such
determination plus the number of shares of Common Stock so offered for
subscription or purchase, such reduction to become effective at the opening of
business on the day following the date fixed for such determination; provided,
                                                                     -------- 
however, that if an adjustment to the Conversion Price is made and any or all of
- -------                                                                         
such rights, options and warrants are not exercised, then a corresponding
reversing adjustment of the Conversion Price shall be made, on an equitable
basis, to take account of such event.  For the purposes of this paragraph (2),
the number of shares of Common Stock at any time outstanding shall not include
shares held in the treasury of the Company but shall include shares issuable in
respect of scrip certificates issued in lieu of fractions of shares of Common
Stock.

          (3) In case outstanding shares of Common Stock shall be subdivided
into a greater number of shares of Common Stock, the Conversion Price in effect
at the opening of business on the day following the day upon which such
subdivision becomes effective shall be proportionately reduced, and, conversely,
in case outstanding shares of Common Stock shall each be combined into a smaller
number of shares of Common Stock, the Conversion Price in effect at the opening
of business on the day following the day upon which such combination becomes
effective shall be proportionately increased, such reduction or increase, as the
case may be, to become effective at the opening of business on the day following
the day upon which such subdivision or combination becomes effective.

          (4) In case the Company shall, by dividend or otherwise, distribute to
all holders of its Common Stock evidences of its indebtedness, shares of any
class of capital stock, cash or assets (including securities, but excluding any
(i) rights, options or warrants referred to in paragraph (2) of this Section,
(ii) any dividend or distribution paid exclusively in cash out of the
consolidated retained earnings of the Company, (iii) any dividend or
distribution referred to in

                                      -83-
<PAGE>
 
paragraph (1) of this Section and (iv) shares issued upon any merger or
consolidation to which Section 1211 applies), the Conversion Price shall be
adjusted so that the same shall equal the price determined by multiplying the
Conversion Price in effect immediately prior to the close of business on the
date fixed for the determination of stockholders entitled to receive such
distribution by a fraction of which the numerator shall be the current market
price per share (determined as provided in paragraph (6) of this Section) of the
Common Stock on the date fixed for such determination less the then fair market
value (as determined by the Board of Directors of the Company, whose
determination shall be conclusive and described in a Company Board Resolution
filed with the Trustee) of the portion of the assets, shares or evidences of
indebtedness so distributed applicable to one share of Common Stock and the
denominator shall be such current market price per share of the Common Stock,
such adjustment to become effective at the opening of business on the day
following the date fixed for the determination of stockholders entitled to
receive such distribution. If the Conversion Price is adjusted because of the
distribution of rights, options or warrants, then, upon the expiration of any
such unexercised right, option or warrant, the Conversion Price shall be
adjusted to equal the Conversion Price that would have applied had such right,
option or warrant never been distributed.

          (5) The reclassification of Common Stock into securities including
other than Common Stock (other than any reclassification upon a consolidation or
merger to which Section 1211 applies) shall be deemed to involve (a) a
distribution of such securities other than Common Stock to all holders of Common
Stock (and the effective date of such reclassification shall be deemed to be
"the date fixed for the determination of stockholders entitled to receive such
distribution" and "the date fixed for such determination" within the meaning of
paragraph (4) of this Section), and (b) a subdivision or combination, as the
case may be, of the number of shares of Common Stock outstanding immediately
prior to such reclassification into the number of shares of Common Stock
outstanding immediately thereafter (and the effective date of such
reclassification shall be deemed to be "the day upon which such subdivision
becomes effective" or "the day upon which such combination becomes effective",
as the case may be, and "the day upon which such subdivision or combination
becomes effective," within the meaning of paragraph (3) of this Section).

          (6) For the purpose of any computation under paragraphs (2) and (4) of
this Section 1204, the current market price per share of Common Stock on any
date shall be calculated by the Company and be deemed to be the average of the
daily Closing Prices Per Share for the five consecutive Trading Days selected by
the Company commencing not more than 10 Trading Days before, and ending not
later than, the earlier of the day in question and the day before the "ex date"
with respect to the issuance or distribution requiring such computation.  For
purposes of this paragraph, the term "ex date," when used with respect to any
issuance or distribution, means the first date on which the Common Stock trades
regular way in the applicable securities market or on the applicable securities
exchange without the right to receive such issuance or distribution.

          (7) No adjustment in the Conversion Price shall be required unless
such adjustment (plus any adjustments not previously made by reason of this
paragraph (7)) would require an increase or decrease of at least one percent in
such Conversion Price; provided, however, that any adjustments which by reason
                       --------  -------                                      
of this paragraph (7) are not required to be made

                                      -84-
<PAGE>
 
shall be carried forward and taken into account in any subsequent adjustment.
All calculations under this Article shall be made to the nearest cent or to the
nearest one-thousandth of a share, as the case may be.

          (8) The Company may make such reductions in the Conversion Price, for
the remaining term of any series of Securities or any shorter term, in addition
to those required by paragraphs (1), (2), (3) and (4) of this Section 1204, as
it considers to be advisable in order to avoid or diminish any income tax to any
holders of shares of Common Stock resulting from any dividend or distribution of
stock or issuance of rights or warrants to purchase or subscribe for stock or
from any event treated as such for income tax purposes.

Section 1205.  Notice of Adjustments of Conversion Price.
               ----------------------------------------- 

          Whenever the Conversion Price is adjusted as herein provided:

          (1) the Company shall compute the adjusted Conversion Price in
accordance with Section 1204 and shall prepare a certificate signed by the
Treasurer of the Company setting forth the adjusted Conversion Price and showing
in reasonable detail the facts upon which such adjustment is based, and such
certificate shall promptly be filed with the Trustee and with each Conversion
Agent; and

          (2) a notice stating that the Conversion Price has been adjusted and
setting forth the adjusted Conversion Price shall forthwith be required, and as
soon as practicable after it is required, such notice shall be provided by the
Company to all Holders in accordance with Section 106.

     Neither the Trustee nor any Conversion Agent shall be under any duty or
responsibility with respect to any such certificate or the information and
calculations contained therein, except to exhibit the same to any Holder of
Securities desiring inspection thereof at its office during normal business
hours.

Section 1206.  Notice of Certain Corporate Action.
               ---------------------------------- 

     In case:

          (a) the Company shall declare a dividend (or any other distribution)
     on its Common Stock payable otherwise than exclusively in cash out of the
     consolidated retained earnings of the Company; or

          (b) the Company shall authorize the granting to the holders of its
     Common Stock of rights, options or warrants to subscribe for or purchase
     any shares of capital stock of any class or of any other rights (other than
     rights, options or warrants to subscribe for or purchase any shares of
     capital stock of any class or of any other rights of a corporation, a
     majority of each class of common stock of which is owned, directly or
     indirectly, by the Company); or

                                      -85-
<PAGE>
 
          (c)  of any reclassification of the Common Stock of the Company (other
     than a subdivision or   combination of its outstanding shares of Common
     Stock), or of any consolidation or merger to which the Company is a party
     and for which approval of the stockholders of the Company is required
     pursuant to applicable corporate law, or of the sale or transfer of all or
     substantially all of the assets of the Company); or

          (d) of the voluntary or involuntary dissolution, liquidation or
     winding up of the Company;

then the Company shall cause to be filed at each office or agency maintained for
the purpose of conversion of Securities pursuant to Section 1002, and shall
cause to be provided to all Holders of Securities convertible pursuant to their
terms in accordance with Section 106, at least 20 days (or 10 days in any case
specified in clause (a) or (b) above) prior to the applicable record or
effective date hereinafter specified, a notice stating (y) the date on which a
record is to be taken for the purpose of such dividend, distribution, rights,
options or warrants, or, if a record is not to be taken, the date as of which
the holders of Common Stock of record to be entitled to such dividend,
distribution, rights, options or warrants are to be determined, or (z) the date
on which such reclassification, consolidation, merger, share exchange,
conveyance, transfer, sale, lease, dissolution, liquidation or winding up is
expected to become effective, and the date as of which it is expected that
holders of Common Stock of record shall be entitled to exchange their shares of
Common Stock for securities, cash or other property deliverable upon such
reclassification, consolidation, merger, share exchange, conveyance, transfer,
sale, lease, dissolution, liquidation or winding up.  If at the time the Trustee
shall not be the Conversion Agent, a copy of such notice and any notice referred
to in the following paragraph shall also forthwith be filed by the Company with
the Trustee.

Section 1207.  Company to Reserve Common Stock.
               ------------------------------- 

     The Company shall at all times reserve and keep available, free from
preemptive rights, out of its authorized but unissued Common Stock, for the
purpose of effecting the conversion of Securities of any series, the full number
of shares of Common Stock then issuable upon the conversion of all Outstanding
Securities of such series.

Section 1208.  Taxes on Conversions.
               -------------------- 

     The Company will pay any and all stamp and similar taxes and duties that
may be payable in respect of the issue or delivery of shares of Common Stock on
conversion of Securities pursuant hereto.  The Company shall not, however, be
required to pay any tax which may be payable in respect of any transfer involved
in the issue and delivery of shares of Common Stock in a name other than that of
the Holder of the Security or Securities to be converted, and no such issue or
delivery shall be made unless and until the Person requesting such issue has
paid to the Company the amount of any such tax, or has established to the
satisfaction of the Company that such tax has been paid.

                                      -86-
<PAGE>
 
Section 1209.  Covenant as to Common Stock.
               --------------------------- 

     The Company agrees that all shares of Common Stock which may be delivered
upon conversion of Securities, upon such delivery, will have been duly
authorized and validly issued and will be fully paid and nonassessable and,
except as provided in Section 1208, the Company will pay all stamp and similar
taxes, liens and charges with respect to the issue thereof.

Section 1210.  Cancellation of Converted Securities.
               ------------------------------------ 

     All Securities delivered for conversion shall be delivered to the Trustee
or the Paying Agent or its agent to be canceled by or at the direction of the
Trustee, which shall dispose of the same as provided in Section 309.

Section 1211.  Provision in Case of Consolidation, Merger or Sale of Assets.
               ------------------------------------------------------------ 

     In case of any consolidation of the Company with, or merger of the Company
into, any other Person, any merger of another Person into the Company (other
than a merger which does not result in any reclassification, conversion,
exchange or cancellation of outstanding shares of Common Stock of the Company)
or any sale or transfer of all or substantially all of the assets of the
Company, the Person formed by such consolidation or resulting from such merger
or which acquires such assets, as the case may be, shall execute and deliver to
the Trustee a supplemental indenture providing that the Holder of each Security
then Outstanding shall have the right thereafter, during the period such
Security shall be convertible as specified in Section 1201, to convert such
Security only into the kind and amount of securities, cash and other property
receivable upon such consolidation, merger, sale or transfer by a holder of the
number of shares of Common Stock of the Company into which such Security might
have been converted immediately prior to such consolidation, merger, sale or
transfer (assuming such holder of Common Stock failed to exercise any rights of
election and that such Security was then convertible). Such supplemental
indenture shall provide for adjustments which, for events subsequent to the
effective date of such supplemental indenture, shall be as nearly equivalent as
may be practicable to the adjustments provided for in this Article Twelve.  If
in the case of any such consolidation, merger, sale or transfer, the stock or
other securities and property receivable by a Holder of the Securities includes
stock or other securities and property of a corporation other than the successor
or purchasing corporation, then such supplemental indenture shall also be
executed by such other corporation and shall contain such additional provisions
to protect the interests of the Holders of the Securities as the Board of
Directors of the Company shall reasonably consider necessary.  The above
provisions of this Section 1211 shall similarly apply to successive
consolidations, mergers, sales or transfers.  Notice of the execution of such a
supplemental indenture shall be given by the Company to the Holder of each
Security as provided in Section 106 promptly upon such execution.

Section 1212.  Compliance with Governmental Requirements.
               ----------------------------------------- 

     The Company covenants that if any shares of Common Stock required to be
reserved for purposes of conversion of Securities hereunder require registration
or listing with or approval of any governmental authority under any Federal or
State law, pursuant to the Securities Act or the

                                      -87-
<PAGE>
 
Exchange Act, or any national or regional securities exchange or other trading
market on which the Common Stock is listed at the time of delivery of any Common
Stock, before such shares may be issued upon conversion, the Company will use
its best efforts to cause such shares to be duly registered, listed or approved,
as the case may be.

                                ARTICLE THIRTEEN

                                 SINKING FUNDS


Section 1301.  Applicability of Article.
               ------------------------ 

     The provisions of this Article Thirteen shall be applicable to any sinking
fund for the retirement of Securities of a series, except as otherwise permitted
or required in or pursuant to this Indenture or any Security of such series
issued pursuant to this Indenture.

     The minimum amount of any sinking fund payment provided for by the terms of
Securities of any series is herein referred to as a "mandatory sinking fund
payment," and any payment in excess of such minimum amount provided for by the
terms of Securities of such series is herein referred to as an "optional sinking
fund payment."  If provided for by the terms of Securities of any series, the
cash amount of any sinking fund payment may be subject to reduction as provided
in Section 1302.  Each sinking fund payment shall be applied to the redemption
of Securities of any series as provided for by the terms of Securities of such
series and this Indenture.

Section 1302.  Satisfaction of Sinking Fund Payments With Securities.
               ----------------------------------------------------- 

     The Company may, in satisfaction of all or any part of any sinking fund
payment with respect to the Securities of any series to be made pursuant to the
terms of such Securities (1) deliver Outstanding Securities of such series
(other than any of such Securities previously called for redemption or any of
such Securities in respect of which cash shall have been released to the
Company), together in the case of any Bearer Securities of such series with all
unmatured Coupons appertaining thereto, and (2) apply as a credit Securities of
such series which have been redeemed either at the election of the Company
pursuant to the terms of such series of Securities or through the application of
permitted optional sinking fund payments pursuant to the terms of such
Securities, provided that such Securities have not been previously so credited.
            -------- ----                                                      

     Such Securities shall be received and credited for such purpose by the
Trustee at the Redemption Price specified in such Securities for redemption
through operation of the sinking fund and the amount of such sinking fund
payment shall be reduced accordingly.  If as a result of the delivery or credit
of Securities of any series in lieu of cash payments pursuant to this Section
1302, the principal amount of Securities of such series to be redeemed in order
to exhaust the aforesaid cash payment shall be less than $100,000, the Trustee
need not call Securities of such series for redemption, except upon Company
Request, and such cash payment shall be held by the Trustee or a Paying Agent
and applied to the next succeeding sinking fund

                                      -88-
<PAGE>
 
payment, provided, however, that the Trustee or such Paying Agent shall at the
         --------  -------
request of the Company from time to time pay over and deliver to the Company any
cash payment so being held by the Trustee or such Paying Agent upon delivery by
the Company to the Trustee of Securities of that series purchased by the Company
having an unpaid principal amount equal to the cash payment requested to be
released to the Company.

Section 1303.  Redemption of Securities for Sinking Fund.
               ----------------------------------------- 

     Not less than 75 days prior to each sinking fund payment date for any
series of Securities, the Company shall deliver to the Trustee an Officers'
Certificate specifying the amount of the next ensuing mandatory sinking fund
payment for that series pursuant to the terms of that series, the portion
thereof, if any, which is to be satisfied by payment of cash and the portion
thereof, if any, which is to be satisfied by delivering and crediting of
Securities of that series pursuant to Section 1302, and the optional amount, if
any, to be added in cash to the next ensuing mandatory sinking fund payment, and
will also deliver to the Trustee any Securities to be so credited and not
theretofore delivered.  If such Officers' Certificate shall specify an optional
amount to be added in cash to the next ensuing mandatory sinking fund payment,
the Company shall thereupon be obligated to pay the amount therein specified.

     Not more than 75 days or less than 45 days before each such sinking fund
payment date the Trustee shall select the Securities to be redeemed upon such
sinking fund payment date in the manner specified in Section 1103 and cause
notice of the redemption thereof to be given in the name of and at the expense
of the Company in the manner provided in Section 1104.  Such notice having been
duly given, the redemption of such Securities shall be made upon the terms and
in the manner stated in Sections 1106 and 1107.

                                ARTICLE FOURTEEN

                            [INTENTIONALLY OMITTED]


                                ARTICLE FIFTEEN

                       REPAYMENT AT THE OPTION OF HOLDERS


Section 1501.  Applicability Of Article.
               ------------------------ 

     Repayment of Securities of any series that are convertible into Common
Stock pursuant to Article Twelve before their Stated Maturity at the option of
Holders thereof shall be made in accordance with the terms of such Securities,
if any, and (except as otherwise specified by the terms of such series
established pursuant to Section 301) in accordance with this Article Fifteen.

                                      -89-
<PAGE>
 
Section 1502.  Repayment Of Securities.
               ----------------------- 

     Securities of any series subject to repayment in whole or in part (which
shall be in a principal amount hereof which is U.S. $1,000 or an integral
multiple thereof) at the option of the Holders thereof on any Repayment Date (as
defined below) will, unless otherwise provided in the Company's Board
Resolutions or Officers' Certificate establishing such series, be repaid at a
price equal to the principal amount thereof, together with interest and
Additional Amounts, if any (the "Repayment Price"), if a Repayment Event shall
                                 ---------------                              
occur or have occurred.  For purposes hereof a "Repayment Event" shall have
                                                ---------------            
occurred if the Common Stock (or other equity securities into which such series
of Securities is then convertible) is neither listed for trading on a United
States national securities exchange, the Nasdaq National Market nor approved for
trading on an established automated over-the-counter trading market in the
United States.  The "Repayment Date" with respect to any Repayment Event shall
                     --------------                                           
be the ninetieth (90th) day after the later of the Exchange Date or the date a
Repayment Event has occurred.  The Company covenants that at or prior to 
10:00 a.m., Eastern Time, on the Repayment Date it will deposit with the Trustee
or with a Paying Agent (or, if the Company is acting as its own Paying Agent,
segregate and hold in trust as provided in Section 1003) an amount of money in
Dollars sufficient to pay the principal (or, if so provided by the terms of the
Securities of any series, a percentage of the principal) of, and (except if the
Repayment Date shall be an Interest Payment Date) accrued interest and
Additional Amounts, if any, on, all the Securities or portions thereof, as the
case may be, to be repaid on such date.

Section 1503. Notice of Repayment.
              ------------------- 

     Unless the Company shall have theretofore called for redemption all of the
Outstanding Securities of such series, on or before the 30th day after the later
of the Exchange Date and the occurrence of a Repayment Event, the Company or, at
the request and expense of the Company, the Trustee shall give notice to all
Holders of Securities entitled to repayment pursuant to terms of such Securities
established in accordance with Section 301, in the manner provided in Section
106 (the "Repayment Notice"), that a Repayment Event has occurred and of the
          ----------------                                                  
repayment right set forth herein arising as a result thereof.  If applicable,
the Company shall also deliver a copy of the Repayment Notice to the Trustee.

     All notices of repayment shall identify the Securities eligible for
repayment and shall state:

     (1)  the Repayment Date,

     (2)  the date by which the repayment right must be exercised,

     (3)  the Repayment Price,

     (4) the Conversion Price then in effect, the date on which the right to
convert the Securities to be repaid will terminate and the place or places where
such Securities, together (in the case of Bearer Securities) with all Coupons
appertaining thereto, if any, maturing after the Repayment Date, may be
surrendered for conversion,

                                      -90-
<PAGE>
 
     (5) a description of the procedure which a Holder must follow to exercise a
repayment right and the place or places where such Securities, together (in the
case of Bearer Securities) with all Coupons appertaining thereto, if any,
maturing after the Repayment Date, are to be surrendered for payment and accrued
interest and Additional Amounts, if any, pertaining thereto, and

     (6) that, unless otherwise specified in such notice, Bearer Securities of
any series, if any, surrendered for repayment must be accompanied by all Coupons
maturing subsequent to the Repayment Date or the amount of any such missing
Coupon or Coupons will be deducted from any amount due to such Holder, unless
security or indemnity satisfactory to the Company, the Trustee and any Paying
Agent is furnished.

Section 1504.  Exercise Of Option.
               ------------------ 

     Any rights of Holders of Securities upon a Repayment Event will be subject
to the Company's compliance with any applicable tender offer rules and any other
applicable securities laws or regulations in connection with any repayment of
outstanding Securities at the option of the Holders thereof.

     Securities of any series subject to repayment at the option of the Holders
thereof will contain an "Option to Elect Repayment" form substantially in the
form of Exhibit E, on the reverse of such Securities.  In order for any Security
        ---------                                                               
to be repaid at the option of the Holder, the Trustee must receive at the Place
of Payment therefor specified in the terms of such Security (or at such other
place or places of which the Company shall from time to time notify the Holders
of such Securities) not earlier than 60 days nor later than 30 days prior to the
Repayment Date (1) the Security so providing for such repayment together with
the "Option to Elect Repayment" form on the reverse thereof duly completed by
the Holder (or by the Holder's attorney duly authorized in writing) or (2) a
telegram, facsimile transmission or a letter from a member of a national
securities exchange or the National Association of Securities Dealers, Inc.
("NASD"), or a commercial bank or trust company in the United States setting
forth the name of the Holder of the Security, the principal amount of the
Security, the principal amount of the Security to be repaid, the CUSIP number,
if any, or a description of the tenor and terms of the Security, a statement
that the option to elect repayment is being exercised thereby and a guarantee
that the Security to be repaid, together with the duly completed form entitled
"Option to Elect Repayment" on the reverse of the Security, will be received by
the Trustee not later than the fifth Business Day after the date of such
telegram, facsimile transmission or letter; provided, however, that such
                                            --------  -------           
telegram, facsimile transmission or letter shall only be effective if such
Security and form duly completed are received by the Trustee by such fifth
Business Day.  If less than the entire principal amount of such Security is to
be repaid in accordance with the terms of such Security, the principal amount of
such Security to be repaid, in increments of the minimum denomination for
Securities of such series, and the denomination or denominations of the Security
or Securities to be issued to the Holder for the portion of the principal amount
of such Security surrendered that is not to be repaid, must be specified.  The
principal amount of any Security providing for repayment at the option of the
Holder thereof may not be repaid in part if, following such repayment, the
unpaid principal amount of such Security would be less than the 

                                      -91-
<PAGE>
 
minimum authorized denomination of Securities of the series of which such
Security to be repaid is a part. Except as otherwise provided in or pursuant to
this Indenture, exercise of the repayment option by the Holder shall be
irrevocable unless waived by the Company and except that the right of the Holder
to convert the Securities with respect to which the repayment option is being
exercised shall continue until the close of business on the second Business Day
preceding the Repayment Date.

Section 1505.  When Securities Presented For Repayment Become Due And Payable.
               -------------------------------------------------------------- 

     If Securities of any series providing for repayment at the option of the
Holders thereof shall have been surrendered as provided in this Article Fifteen
and as provided by or pursuant to the terms of such Securities, such Securities
or the portions thereof, as the case may be, to be repaid shall become due and
payable and shall be paid by the Company on the Repayment Date therein
specified, and on and after such Repayment Date (unless the Company shall
default in the payment of such Securities on such Repayment Date) such
Securities shall, if the same were interest-bearing, cease to bear interest and
the Coupons for such interest appertaining to any Bearer Securities so to be
repaid, except to the extent provided below, shall be void. Upon surrender of
any such Security for repayment in accordance with such provisions, together
with all Coupons, if any, appertaining thereto maturing after the Repayment
Date, the principal amount of such Security so to be repaid shall be paid by the
Company, together with accrued interest and Additional Amounts, if any, to the
Repayment Date; provided, however, that Coupons whose Stated Maturity is on or
                --------  -------                                             
prior to the Repayment Date shall be payable only at an office or agency located
outside the United States (except as otherwise provided in Section 1002) and,
unless otherwise specified pursuant to Section 301, only upon presentation and
surrender of such Coupons; and provided, further, that, in the case of
Registered Securities, installments of interest and Additional Amounts, if any,
whose Stated Maturity is on or prior to the Repayment Date shall be payable (but
without interest thereon, unless the Company shall default in the payment
thereof) to the Holders of such Securities, or one or more Predecessor
Securities, registered as such at the close of business on the relevant Record
Dates according to their terms and the provisions of Section 307.

     If any Bearer Security surrendered for repayment shall not be accompanied
by all appurtenant Coupons maturing after the Repayment Date, such Security may
be paid after deducting from the amount payable therefor as provided in Section
1502 an amount equal to the face amount of all such missing Coupons, or the
surrender of such missing Coupon or Coupons may be waived by the Company and the
Trustee if there be furnished to them such security or indemnity as they may
require to save each of them and any Paying Agent harmless.  If thereafter the
Holder of such Security shall surrender to the Trustee or any Paying Agent any
such missing Coupon in respect of which a deduction shall have been made as
provided in the preceding sentence, such Holder shall be entitled to receive the
amount so deducted; provided, however, that interest represented by Coupons
                    --------  -------                                      
shall be payable only at an office or agency located outside the United States
(except as otherwise provided in Section 1002) and, unless otherwise specified
as contemplated by Section 301, only upon presentation and surrender of those
Coupons.

     If the principal amount of any Security surrendered for repayment shall not
be so repaid upon surrender thereof, such principal amount (together with
interest, if any, thereon accrued to 

                                      -92-
<PAGE>
 
such Repayment Date) shall, until paid, bear interest from the Repayment Date at
the rate of interest or yield to maturity (in the case of Original Issue
Discount Securities ) set forth in such Security.

Section 1506. Securities Repaid In Part.
              ------------------------- 

     Upon surrender of any Security which is to be repaid in part only, the
Company shall execute and the Trustee shall authenticate and deliver to the
Holder of such Security, without service charge and at the expense of the
Company, a new Security or Securities of the same series, of any authorized
denomination specified by the Holder, in an aggregate principal amount equal to
and in exchange for the portion of the principal of such Security so surrendered
which is not to be repaid.

                                ARTICLE SIXTEEN

                       MEETINGS OF HOLDERS OF SECURITIES

Section 1601.  Purposes for Which Meetings May Be Called.
               ----------------------------------------- 

     A meeting of Holders of Securities of any series may be called at any time
and from time to time pursuant to this Article Sixteen to make, give or take any
request, demand, authorization, direction, notice, consent, waiver or other Act
provided by this Indenture to be made, given or taken by Holders of Securities
of such series.

Section 1602.  Call, Notice and Place of Meetings.
               ---------------------------------- 

          (1) The Trustee may at any time call a meeting of Holders of
     Securities of any series for any purpose specified in Section 1601, to be
     held at such time and at such place in the Borough of Manhattan, The City
     of New York, or, if Securities of such series have been issued in whole or
     in part as Bearer Securities, in London or in such place outside the United
     States as the Trustee shall determine.  Notice of every meeting of Holders
     of Securities of any series, setting forth the time and the place of such
     meeting and in general terms the action proposed to be taken at such
     meeting, shall be given, in the manner provided in Section 106, not less
     than 21 nor more than 180 days prior to the date fixed for the meeting.

          (2) In case at any time the Company (by or pursuant to a Board
     Resolution) or the Holders of at least 10% in principal amount of the
     Outstanding Securities of any series shall have requested the Trustee to
     call a meeting of the Holders of Securities of such series for any purpose
     specified in Section 1601, by written request setting forth in reasonable
     detail the action proposed to be taken at the meeting, and the Trustee
     shall not have mailed notice of or made the first publication of the notice
     of such meeting within 21 days after receipt of such request (whichever
     shall be required pursuant to Section 106) or shall not thereafter proceed
     to cause the meeting to be held as provided herein, then the Company or the
     Holders of Securities of such series in the amount above specified, as the
     case may be, may determine the time and the place in the Borough of

                                      -93-
<PAGE>
 
     Manhattan, The City of New York, or, if Securities of such series are to be
     issued as Bearer Securities, in London for such meeting and may call such
     meeting for such purposes by giving notice thereof as provided in clause
     (1) of this Section.

Section 1603.  Persons Entitled to Vote at Meetings.
               ------------------------------------ 

     To be entitled to vote at any meeting of Holders of Securities of any
series, a Person shall be (1) a Holder of one or more Outstanding Securities of
such series, or (2) a Person appointed by an instrument in writing as proxy for
a Holder or Holders of one or more Outstanding Securities of such series by such
Holder or Holders.  The only Persons who shall be entitled to be present or to
speak at any meeting of Holders of Securities of any series shall be the Persons
entitled to vote at such meeting and their counsel, any representatives of the
Trustee and its counsel and any representatives of the Company and its counsel.

Section 1604.  Quorum; Action.
               -------------- 

     The Persons entitled to vote a majority in principal amount of the
Outstanding Securities of a series shall constitute a quorum for a meeting of
Holders of Securities of such series; provided, however, that if any action is
                                      --------  -------                       
to be taken at such meeting with respect to a consent or waiver which this
Indenture expressly provides may be given by the Holders of at least 66-2/3% in
principal amount of the Outstanding Securities of a series, the Persons entitled
to vote 66-2/3% in principal amount of the Outstanding Securities of such series
constitute a quorum.  In the absence of a quorum within 30 minutes after the
time appointed for any such meeting, the meeting shall, if convened at the
request of Holders of Securities of such series, be dissolved.  In any other
case the meeting may be adjourned for a period of not less than 10 days as
determined by the chairman of the meeting prior to the adjournment of such
meeting.  In the absence of a quorum at any such adjourned meeting, such
adjourned meeting may be further adjourned for a period of not less than 10 days
as determined by the chairman of the meeting prior to the adjournment of such
adjourned meeting.  Notice of the reconvening of any adjourned meeting shall be
given as provided in Section 1602(1), except that such notice need be given only
once not less than five days prior to the date on which the meeting is scheduled
to be reconvened.  Notice of the reconvening of an adjourned meeting shall state
expressly the percentage, as provided above, of the principal amount of the
Outstanding Securities of such series which shall constitute a quorum.

     Except as limited by the proviso to Section 902, any resolution presented
to a meeting or adjourned meeting duly reconvened at which a quorum is present
as aforesaid may be adopted only by the affirmative vote of the Holders of a
majority in principal amount of the Outstanding Securities of that series;
                                                                          
provided, however, that, except as limited by the proviso to Section 902, any
- --------  -------                                                            
resolution with respect to any consent or waiver which this Indenture expressly
provides may be given by the Holders of at least 66-2/3% in principal amount of
the Outstanding Securities of a series may be adopted at a meeting or an
adjourned meeting duly convened and at which a quorum is present as aforesaid
only by the affirmative vote of the Holders of 66-2/3% in principal amount of
the Outstanding Securities of that series; and provided, further, that, except
as limited by the proviso to Section 902, any resolution with respect to any
request, demand, authorization, direction, notice, consent, waiver or other Act
which this Indenture expressly

                                      -94-
<PAGE>
 
provides may be made, given or taken by the Holders of a specified percentage,
which is less than a majority, in principal amount of the Outstanding Securities
of a series may be adopted at a meeting or an adjourned meeting duly reconvened
and at which a quorum is present as aforesaid by the affirmative vote of the
Holders of such specified percentage in principal amount of the Outstanding
Securities of such series.

     Any resolution passed or decision taken at any meeting of Holders of
Securities of any series duly held in accordance with this Section shall be
binding on all the Holders of Securities of such series and the Coupons
appertaining thereto, whether or not such Holders were present or represented at
the meeting.

Section 1605.  Determination of Voting Rights; Conduct and Adjournment of
               ----------------------------------------------------------
Meetings.
- -------- 

          (1) Notwithstanding any other provisions of this Indenture, the
     Trustee may make such reasonable regulations as it may deem advisable for
     any meeting of Holders of Securities of such series in regard to proof of
     the holding of Securities of such series and of the appointment of proxies
     and in regard to the appointment and duties of inspectors of votes, the
     submission and examination of proxies, certificates and other evidence of
     the right to vote, and such other matters concerning the conduct of the
     meeting as it shall deem appropriate.  Except as otherwise permitted or
     required by any such regulations, the holding of Securities shall be proved
     in the manner specified in Section 104 and the appointment of any proxy
     shall be proved in the manner specified in Section 104 or by having the
     signature of the person executing the proxy witnessed or guaranteed by any
     trust company, bank or banker authorized by Section 104 to certify to the
     holding of Bearer Securities.  Such regulations may provide that written
     instruments appointing proxies, regular on their face, may be presumed
     valid and genuine without the proof specified in Section 104 or other
     proof.

          (2) The Trustee shall, by an instrument in writing, appoint a
     temporary chairman of the meeting, unless the meeting shall have been
     called by the Company or by Holders of Securities as provided in Section
     1602(2), in which case the Company or the Holders of Securities of the
     series calling the meeting, as the case may be, shall in like manner
     appoint a temporary chairman.  A permanent chairman and a permanent
     secretary of the meeting shall be elected by vote of the Persons entitled
     to vote a majority in principal amount of the Outstanding Securities of
     such series represented at the meeting.

          (3) At any meeting, each Holder of a Security of such series or proxy
     shall be entitled to one vote for each $1,000 principal amount of
     Securities of such series held or represented by him; provided, however,
                                                           --------  ------- 
     that no vote shall be cast or counted at any meeting in respect of any
     Security challenged as not Outstanding and ruled by the chairman of the
     meeting to be not Outstanding.  The chairman of the meeting shall have no
     right to vote, except as a Holder of a Security of such series or proxy.

          (4) Any meeting of Holders of Securities of any series duly called
     pursuant to Section 1602 at which a quorum is present may be adjourned from
     time to time by Persons entitled to vote a majority in principal amount of
     the Outstanding Securities of 

                                      -95-

<PAGE>
 
      such series represented at the meeting; and the meeting may be held as so 
      adjourned without further notice.

      Section 1606.  Counting Votes and Recording Action of Meetings.
                     -----------------------------------------------

     The vote upon any resolution submitted to any meeting of Holders of
Securities of any series shall be by written ballots on which shall be
subscribed the signatures of the Holders of Securities of such series or of
their representatives by proxy and the principal amounts and serial numbers of
the Outstanding Securities of such series held or represented by them. The
permanent chairman of the meeting shall appoint two inspectors of votes who
shall count all votes cast at the meeting for or against any resolution and who
shall make and file with the secretary of the meeting their verified written
reports in triplicate of all votes cast at the meeting. A record, at least in
triplicate, of the proceedings of each meeting of Holders of Securities of any
series shall be prepared by the secretary of the meeting and there shall be
attached to said record the original reports of the inspectors of votes on any
vote by ballot taken thereat and affidavits by one or more persons having
knowledge of the facts setting forth a copy of the notice of the meeting and
showing that said notice was given as provided in Section 1602 and, if
applicable, Section 1604.  Each copy shall be signed and verified by the
affidavits of the permanent chairman and secretary of the meeting and one such
copy shall be delivered to the Company and another to the Trustee to be
preserved by the Trustee, the latter to have attached thereto the ballots voted
at the meeting. Any record so signed and verified shall be conclusive evidence
of the matters therein stated.


                               ARTICLE SEVENTEEN   
                                                   
                            [INTENTIONALLY OMITTED] 


                              ARTICLE EIGHTEEN   
                                                      
                           [INTENTIONALLY OMITTED] 


                                    * * * 

     This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                 [Remainder of page intentionally left blank]

                                     -96- 








<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed, and their respective corporate seals to be hereunto affixed, all
as of the day and year first above written.

                                   THERMO ELECTRON CORPORATION


(SEAL)                             By: /s/ Kenneth J. Apicerno
                                       ---------------------------
                                   Name: Kenneth J. Apicerno
                                   Title: Treasurer
Attest:

/s/ Sandra L. Lambert
- -----------------------
  Secretary

                                    BANKERS TRUST COMPANY, as TRUSTEE


                                    By: /s/ Ednora G. Linares
                                        ---------------------------
(SEAL)                              Name:   Ednora G. Linares
                                    Title:  Assistant Vice President

Attest:

/s/ Marc Parilla
- ------------------



                                     -97-
<PAGE>
 

COMMONWEALTH OF MASSACHUSETTS      )
                                   )  : SS.:
COUNTY OF MIDDLESEX                )


     On the 27th day of October, 1998, before me personally came Kenneth J.
Apicerno, to me known, who, being by me duly sworn, did depose and say that he
is the Treasurer of Thermo Electron Corporation, a Delaware corporation, one of
the corporations described in and which executed the foregoing instrument; that
he knows the seal of said Corporation; that the seal affixed to said instrument
is such Corporation's seal; that it was so affixed by authority of the Board of
Directors of said Corporation; and that he signed his name thereto by like
authority.

                                    /s/ Natalie J. Muecke
                                    ------------------------------------
                                    Notary Public
                                    Commission Expires: September 3, 2004


[NOTARIAL SEAL]



STATE OF NY   )
              )  : SS.:
COUNTY OF NY  )


     On the 29th day of October, 1998, before me personally came
Marc Parilla, to me known, who, being by me duly sworn, did depose and say
that he is an Asst. Treasurer of Bankers Trust Company, a New York banking
corporation, one of the persons described in and who executed the foregoing
instrument; that he knows the seal of said Corporation; that the seal affixed to
said instrument is such Corporation's seal; that it was so affixed by authority
of the Board of Directors of said Corporation; and that he signed his name
thereto by like authority.

                                    /s/ Matthew Sherman
                                    -------------------------------
                                    Notary Public

                                    Notary Public, State of New York
                                      No. O1SH5087362
                                    Qualified in Westchester County
                                    Commission Expires 11/3/99
[NOTARIAL SEAL]


                                      -98-

<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------
                                                                                
     This is one of the Securities of the series designated therein referred to
in the within-mentioned Indenture.

                                    NAME OF TRUSTEE,
                                    as Trustee
*Dated:
                                    BY:_________________________________
                                       Authorized Officer








______________________________
*  for registered securities only
                                      A-1
<PAGE>
 
                                                                       EXHIBIT B
                                                                       ---------
                                                                                
                               CONVERSION NOTICE

     (A) FOR BEARER SECURITIES:

     The undersigned Holder of this Security hereby irrevocably exercises the
option to convert this security, or any portion of the principal amount hereof
(which is an integral multiple of U.S. $1,000 below designated) into shares of
common stock in accordance with the terms of the indenture referred to in this
security and directs that such shares, together with a check in payment for any
fractional share and any securities representing any unconverted principal
amount hereof, be delivered to the undersigned unless a different name has been
indicated below.  The address for payment of any such check must be outside the
united states.  If shares are to be registered in the name of a person other
than the undersigned, the undersigned will pay all transfer taxes payable with
respect thereto.


DATED: __________________                        _____________________________
                                                 SIGNATURE
 
 
If shares are to be registered in the name of   HOLDER 
and delivered to a person other than the
holder, please print such person's name and     Please print name and address 
address:                                        of Holder
 
 
 
 
_____________________________________           _____________________________
Name                                            Name
 
_____________________________________           _____________________________
Address                                         Address
 
_____________________________________           _____________________________
 
 
_____________________________________           _____________________________
 
 
_____________________________________           _____________________________
Social Security or other Taxpayer               Social Security or other 
Identification Number, if any                   Taxpayer Identification 
                                                Number, if any

                                      B-1
<PAGE>
 
Name and address (outside the United States)   if only a portion of the      
 to where any check referred to in the first   securities is to be converted,
 paragraph of this conversion notice should    please indicate:              
 be mailed:                                                                     
                                               1. principal amount to be     
                                               converted:                    
                                                                                
                                               U.S. $___________________     
_______________________________                                                 
name                                                                            
                                              2. Principal amount and           
                                              denomination of Bearer Securities 
_______________________________               representing unconverted principal
address                                       amount to be issued:              
                                                                      


                                              Amount: U.S. $ _______________
                                              denominations:                    


                                              U.S.$__________                   
                                              (any integral multiple of U.S.    
                                              $1,000)                        
                                              
                                              
                                              
                                              
                                      B-2
<PAGE>
 
(b) for Registered Securities:

the undersigned Holder of this security hereby irrevocably exercises the
option to convert this Security, or any portion of the principal amount hereof
(which is an integral multiple of U.S. $1,000 below designated) into shares of
Common Stock in accordance with the terms of the Indenture referred to in this
Security, and directs that such shares, together with a check in payment for any
fractional share and any Securities representing any unconverted principal
amount hereof, be delivered to and be registered in the name of the undersigned
unless a different name has been indicated below.  If shares or Securities are
to be registered in the name of a person other than the undersigned, the
undersigned will pay all transfer taxes payable with respect thereto.
 
Dated:_________________________     ______________________________
                                         Signature

                                    [MUST BE GUARANTEED IF STOCK OR SECURITIES
                                    ARE TO BE ISSUED IN A NAME OTHER THAN THE
                                    REGISTERED HOLDER OF THE SECURITY]

____________________________________
NAME
 
____________________________________
ADDRESS
____________________________________
Social Security or other Taxpayer
 Identification Number, if any

                                      B-3
<PAGE>
 
<TABLE>
<S>                                             <C>
If shares or Registered Securities are to be    IF ONLY A PORTION OF THE SECURITIES IS TO BE
registered in the name of a Person other        CONVERTED, PLEASE INDICATE:
than the Holder, please print such Person's
name and address:                               1.  Principal amount to be converted:
 
                                                U.S. $___________________
 
 
_______________________________                 2.  Principal amount and denomination of
Name                                            Registered Securities representing unconverted
                                                principal amount to be issued.
 
_______________________________
Address                    
                                                Amount:  U.S.$_________________
_______________________________
Social Security or other taxpayer               Denominations:
 Identification Number, if any                  U.S.$__________
                                                (any integral multiple of U.S. $1,000)
 
 
</TABLE> 


                                      B-4
<PAGE>
 
                                                                       EXHIBIT C
                                                                       ---------

                Form of Certificate of Beneficial Ownership for
                    Bearer Securities to be Provided to the
              Euroclear Operator or to Cedel Bank, societe anonyme

                                 CERTIFICATION
                                 -------------
                                        
                               U.S. $____________

                          THERMO ELECTRON CORPORATION

                             [Title of Securities]

                               (the "Securities")

     This is to certify that as of the date hereof and except as set forth
below, $___________ aggregate principal amount of the above-mentioned Securities
held by you for our account are owned or, if this certificate is being delivered
in connection with a payment of interest, were owned, by or on behalf of, (a) a
person (other than a financial institution for purposes of resale during the
restricted period) who is not a United States person; or (b) a United States
person (other than a financial institution for purposes of resale during the
restricted period) who is (i) a foreign branch of a United States financial
institution or (ii) a United States person acquiring such Securities through the
foreign branch of a United States financial institution and who for purposes of
this certification holds such Securities through such financial institution on
the date hereof, and, in the case of either (i) or (ii), such United States
financial institution has agreed, for the benefit of the Company, to comply with
the requirements of Section 165(j)(3)(A), (B) or (C) of the United States
Internal Revenue Code of 1986, as from time to time amended, and the regulations
thereunder; or (c) a financial institution for purposes of resale during the
restricted period and such financial institution has not acquired such
Securities for purposes of resale directly or indirectly to a United States
person or to a person within the United States or its possessions; and the
undersigned has obtained a similar certificate from its member organizations on
which this certificate is based; provided, however, that if the undersigned has
actual knowledge that the information contained in such a certificate is false
(and, absent documentary evidence that the beneficial owner of such Security is
not a United States person, it will be deemed to have actual knowledge that such
certificate is false if it has a United States address for such beneficial
owner, other than a financial institution described above), the undersigned will
not deliver a Security in temporary or definitive bearer form to the person who
signed such certificate notwithstanding the delivery of such certificate to the
undersigned.

                                      C-1
<PAGE>
 
<TABLE>
<CAPTION>
                           No. of Certificates                    Amount
<S>                        <C>                      <C>     <C>
$1,000 Denomination        ________________         =       $________________
$10,000 Denomination       ________________         =       $________________
[Other     Authorized      ________________         =       $________________
 Denomination]
Total Requested            ________________         =       $________________*
 
</TABLE>
     As used herein, (i) "United States person" means (a) a citizen or resident
of the United States, (b) a corporation, partnership or other entity created or
organized in or under the laws of the United States, (c) an estate, the income
of which is subject to United States Federal income taxation regardless of
source, (d) any trust if a court within the United States is able to exercise
primary supervision of the administration thereof and one or more United States
persons has the authority to control all substantial decisions thereof, or (e)
any other person deemed a "United States person" or a "U.S. person" under the
Internal Revenue Code of 1986, as amended, (ii) "United States" means the United
States of America (including the several States and the District of Columbia)
and its territories, its possessions and other areas subject to its
jurisdiction, (iii) "restricted period" means the period described in Section
1.163-5(c)(2)(i)(D)(7) of the United States Treasury Regulations, and (iv)
"financial institution" means the persons described in Section 1. 165-
12(c)(1)(v) of the United States Treasury Regulations.

     We undertake to advise you promptly by tested telex on or prior to the date
on which you intend to submit your certification relating to the Securities held
by you for our account in accordance with your operating procedures if any
applicable statement herein is not correct on such date, and in the absence of
any such notification it may be assumed that this certification applies as of
such date.

     This certification excepts and does not relate to U.S.$_______________ of
such interest in the above Securities in respect of which we are not able to
certify and as to which we understand exchange and delivery of Definitive
Securities cannot be made until we do so certify.



_________________
* Must equal the amount stated in the first paragraph of this certificate.

                                      C-2
<PAGE>
 
     We understand that this certification is required in connection with
certain tax laws and, if applicable, certain securities laws of the United
States.  In connection therewith, if administrative or legal proceedings are
commenced or threatened in connection with which this certification is or would
be relevant, we irrevocably authorize you to produce this certification or a
copy hereof to any interested party in such proceedings.

Dated:    ___________________, ____**




                                    [Name]


                                    By:_________________________
                                       Signature
                                       As, or as agent for, the beneficial
                                       owner[s] of the Securities to which this
                                       certificate relates.

___________
** Not earlier than 15 days prior to the earlier of the date that definitive 
Bearer Secuirty is delivered and the Exchange Date.

                                      C-3
<PAGE>
 
                                                                       EXHIBIT D
                                                                       ---------

                       Form of Certificate to be Given by
             the Euroclear Operator and Cedel Bank, societe anonyme


                                 CERTIFICATION
                                 -------------
                                        
                                     U.S. $

                          THERMO ELECTRON CORPORATION

                             [Title of Securities]

                              (the  "Securities")

     This is to certify that, based solely on certifications we have received in
writing, by tested telex or electronic transmission from member organizations
appearing in our records as persons being entitled to a portion of the principal
amount set forth below or to interest payable on an interest payment date (our
"Member Organizations"), substantially to the effect set forth in the Indenture
relating to the above-captioned Securities, as of the date hereof, U.S.
$_______________ aggregate principal amount of the above-captioned Securities is
owned by persons that are not (a) citizens or residents of the United States,
(b) corporations, partnerships or other entities created or organized in or
under the laws of the United States, (c) an estate, the income of which is
subject to United States Federal income taxation regardless of source, (d) any
trust if a court within the United States is able to exercise primary
supervision of the administration thereof and one or more United States persons
has the authority to control all substantial decisions thereof, or (e) any other
person deemed a "United States person" or a "U.S. person" under the Internal
Revenue Code of 1986, as amended, and the regulations thereunder ("United States
persons").

     The following denominations of Bearer Securities are requested:

<TABLE>
<CAPTION>
                           No. of Certificates                    Amount
<S>                        <C>                      <C>     <C>
$1,000 Denomination        ________________         =       $________________
$10,000 Denomination       ________________         =       $________________
[Other     Authorized      ________________         =       $________________
 Denomination]
Total Requested            ________________         =       $________________*
</TABLE>

     We further certify (i) that we are not making available herewith for
exchange any portion of the temporary global Security excepted in such
certifications and (ii) that as of the date hereof we have not received any
notification from any of our Member Organizations to the effect that the
statements made by such Member Organization with respect to any portion of the
part

- -------------
* Must equal the amount stated in the first paragraph of this certificate.

                                      D-1
<PAGE>
 
submitted herewith for exchange are no longer true and cannot be relied
upon as of the date hereof.  We further certify that interest payable on the
interest payment dates on _________ and _________ will be paid with respect to
U.S. $_____________ principal amount of the Securities with respect to which we
have received from Member Organizations certificates substantially in the form
set out in Exhibit C to the Indenture relating to the Securities that the
Securities (a) are owned by a person (other than a financial institution for
purposes of resale during the restricted period) who is not a United States
person; (b) are owned by a United States person (other than a financial
institution for purposes of resale during the restricted period) who is (i) a
foreign branch of a United States financial institution or (ii) a United States
person who acquired such Securities through the foreign branch of a United
States financial institution and who for purposes of this certification holds
such Securities through such financial institution on the date hereof and, in
either case, such United States financial institution has agreed, for the
benefit of the Company, to comply with the requirements of Section 165(j)(3)(A),
(B) or (C) of the United States Internal Revenue Code of 1986, as from time to
time amended, and the regulations thereunder; or (c) are owned by a financial
institution for purposes of resale during the restricted period and such
financial institution has certified that it has not acquired such Securities for
purposes of resale directly or indirectly to a United States person or to a
person within the United States or its possessions.

     To the extent that we have knowledge that any of such certificates from a
Member Organization is false and to the extent that we have not received with
respect to any Securities such certificates from Member Organization, we are not
requesting that payment be made for interest with respect thereto.

     We further certify that as of the date hereof we have not received any
notification from any of our Member Organizations to the effect that the
statements made by such Member Organization with respect to any interest payment
on any portion of the principal amount of the Securities are no longer true and
cannot be relied upon as of the date hereof.  We further certify that under the
rules of the undersigned organization, each Member Organization has agreed that
any electronic certification shall have the effect of a signed certification and
that all certifications shall be retained for at least four calendar years
following the year in which the certifications are received in compliance with
the rules set forth under Treas.  Reg. 1.163-5(c)(2)(i)(D)(3)(i).

     We undertake that any interest received by us and not paid as provided
above shall be returned to the Trustee for the above-captioned Securities
immediately prior to the expiration of two years after such interest payment
date in order to be repaid by such Trustee to the above issuer at the end of two
years after such interest payment date.

     We understand that this certification is required in connection with
certain tax laws and, if applicable, certain securities laws of the United
States.  In connection therewith, if administrative or legal proceedings are
commenced or threatened in connection with which this certification is or would
be relevant, we irrevocably authorize you to produce this certification to any
interested party in such proceedings.


                                      D-2
<PAGE>
 
     As used herein, "United States" means the United States of America
(including the several States and the District of Columbia), and its
territories, its possessions and other areas subject to its jurisdiction.  As
used herein, "restricted period" means the period described in Section 1.163-
5(c)(2)(i)(D)(7) of the United States Treasury Regulations and "financial
institution" means the persons described in Section 1.165-12(c)(1)(v) of the
United States Treasury Regulations.


Dated:    ____________________, ____**



                         Yours faithfully,

                         [MORGAN GUARANTY TRUST COMPANY OF NEW YORK, BRUSSELS
                         OFFICE, AS OPERATOR OF THE EUROCLEAR SYSTEM]

                         [CEDEL BANK, SOCIETE ANONYME]***



                         By:_____________________________



________________
**   To be dated no earlier than the earlier of the date the definitive Bearer
Security is delivered and the Exchange Date.
***   Delete as appropriate.

                                      D-3
<PAGE>
 
                                                                       EXHIBIT E
                                                                       ---------
                                                                                
                           OPTION TO ELECT REPAYMENT
                             UPON A REPAYMENT EVENT

To:  Thermo Electron Corporation

     The undersigned owner of this Security hereby acknowledges receipt of a
notice from Thermo Electron Corporation (the "Company") as to the occurrence of
a Repayment Event with respect to the Common Stock of the Company and requests
and instructs the Company to repay the entire principal amount of this Security,
or the portion thereof (which is $1,000 or an integral multiple thereof) below
designated, in accordance with the terms of the Indenture referred to in this
Security at the Repayment Price (or the relevant percentage thereof), together
with accrued interest to such date (except if the Repayment Date shall be an
Interest Payment Date), to the holder hereof.


Dated: ________________________

                            ________________________________
                            Signature*(s)

                            Name: __________________________
                            Address:_________________________
                                    _________________________
                            [* Signature Guarantee Required]

                            Principal amount to be repaid
                            (if less than all):
                            $__________
                            NOTICE:  If this Security is issued
                            in registered form, the above
                            signatures of the holder(s) hereof
                            must correspond with the name as it appears
                            in the Security in every particular without
                            alteration or enlargement or any
                            change whatever.

__________________
Social Security or Other
Taxpayer Identification Number

                                      E-1

<PAGE>
 
                                                                     EXHIBIT 4.2


    ======================================================================



                         THERMO ELECTRON CORPORATION,
                                    ISSUER


                                      AND


                             BANKERS TRUST COMPANY,
                                    TRUSTEE



                             ____________________


                         FIRST SUPPLEMENTAL INDENTURE

                         Dated as of October 29, 1998

                             ____________________



                  $150,000,000 Aggregate Principal Amount of

                  Ten Year 7.625% Notes due October 30, 2008



    ======================================================================
<PAGE>
 
     FIRST SUPPLEMENTAL INDENTURE, dated as of October 29, 1998 ("First
                                                                  -----
Supplemental Indenture"), between Thermo Electron Corporation, a corporation
- ----------------------                                                      
duly organized and existing under the laws of the State of Delaware (hereinafter
called the "Company"), having its principal executive office located at 81 Wyman
            -------                                                             
Street, Waltham, Massachusetts 02454-9046, and Bankers Trust Company, a banking
corporation duly organized and existing under the laws of the State of New York
(hereinafter called the "Trustee"), having its principal corporate trust office
                         -------                                               
located at Four Albany Street, 4th Floor, New York, New York 10006.

                                   RECITALS:

     WHEREAS, the Company has executed and delivered a Senior Indenture dated as
of October 29, 1998 (hereinafter called the "Indenture"), to provide for the
                                             ---------                      
issuance from time to time of its unsecured senior debentures, notes or other
evidences of indebtedness (hereinafter called the "Securities").  Capitalized
                                                   ----------                
terms used herein and not otherwise defined shall have the meanings given them
in the Indenture.

     WHEREAS, Section 901 of the Indenture authorizes the Company and the
Trustee to enter into supplemental indentures without the consent of the Holders
to (i) add to the covenants of the Company for the benefit of the Holders of all
or any series of Securities and (ii) add covenants which shall be subject to
covenant defeasance.

     WHEREAS, to so provide for such additional covenants solely for the benefit
of the series of Securities created hereby, and to so provide that certain
additional covenants will be subject to covenant defeasance, the Company has
authorized the execution of this First Supplemental Indenture to the Indenture
and has requested the Trustee to execute the First Supplemental Indenture.

     WHEREAS, all conditions and requirements necessary to make this First
Supplemental Indenture a valid, binding and legal instrument have been done and
performed and the execution and delivery hereof have been in all respects duly
authorized, including the delivery to the Trustee of the Opinion of Counsel and
the Officers' Certificate referenced in Section 903 of the Indenture.

         NOW, THEREFORE, THIS FIRST SUPPLEMENTAL INDENTURE WITNESSETH:

     The Company and the Trustee hereby covenant, declare and agree as follows:


                                   PART ONE

                     CREATION AND AUTHORIZATION OF SERIES

     There is hereby created and authorized the series of Notes entitled the
"Ten Year 7.625% Notes, due October 30, 2008," (the "Series") which shall be
a closed series limited to
                                      -2-
<PAGE>
 
$150,000,000 aggregate principal amount (except for Notes authenticated and
delivered upon registration of transfer of, or in exchange for, or in lieu of,
other Notes of this series pursuant to Section 305 of the Indenture).


                                   PART TWO

                 SPECIAL PROVISIONS APPLICABLE TO THIS SERIES

     The following special provisions are applicable to this Series only and are
hereby agreed to as follows:

     (a) Section 101 of Article One of the Indenture is amended to redefine the
term "Subsidiary" as follows:

     "Subsidiary" of any specified Person means (i) a corporation, at least a
      ----------                                                             
majority of the outstanding securities of which having ordinary voting power
(other than securities having such power only by reason of the happening of a
contingency) is at such time owned by such Person, either directly or indirectly
by or with one or more Subsidiaries of such Person; or (ii) a partnership, joint
venture, association, or other business entity, if in accordance with GAAP such
entity is consolidated with such Person for financial statement purposes.

     (b) Section 101 of Article One of the Indenture is amended to add the
following new definitions thereto, in the appropriate alphabetical sequence:

     "Attributable Debt" means, when used in connection with a sale and
      -----------------                                                
leaseback transaction, at any date as of which the amount thereof is to be
determined, the lesser of (i) the fair value of the property subject to the
transaction (as determined in good faith by the officers of the Company) or (ii)
the present value of rent for the remaining term of the lease.  Rent shall be
discounted to present value at the actual percentage rate inherent in such lease
as determined in good faith by the officers of the Company, compounded
semiannually.  Rent is the lesser of (1) rent for the remaining term of the
lease assuming it is not terminated or (2) rent from the date of determination
until the first possible termination date plus the termination payment then due,
if any.  The remaining term of a lease includes any period for which the lease
has been extended.  Rent does not include (a) amounts for maintenance, repairs,
insurance, taxes, assessments and similar charges or (b) contingent rent, such
as that based on sales.  Rent may be reduced by rent that any sublessee must pay
from the date of determination for all or part of the same property.

     "Consolidated Net Assets" means the consolidated total assets of the
      -----------------------                                            
Company and its Subsidiaries as reflected in the Company's most recent balance
sheet prepared in accordance with GAAP, less (i) current liabilities (excluding
current maturities of long-term debt and obligations under capital leases) and
(ii) trademarks, patents, and minority interests of others.  Consolidated Net
Assets includes goodwill of the Company and its Subsidiaries.

                                      -3-
<PAGE>
 
     "Designated Subsidiary" means any Subsidiary of the Company, other than an
      ---------------------                                                    
International Subsidiary, which is wholly owned by the Company, either directly
or indirectly through or with one or more wholly owned Subsidiaries of the
Company, on the date as of which a determination is being made, whether or not
such Subsidiary was owned as of the date of the Indenture or was created or
acquired after the date of the Indenture.  A Subsidiary is "wholly owned" by a
Person or Persons if such Person or Persons own(s) all of the capital stock of
such Subsidiary, other than directors' qualifying shares or similar securities.

     "Indebtedness" means, with respect to any Person, the aggregate amount
      ------------                                                         
(without duplication) of: (i) all obligations for borrowed money; (ii) all
obligations evidenced by debentures, notes or other similar instruments; (iii)
all obligations to pay the deferred purchase price of property or services,
except trade accounts payable, accrued commissions and other similar accrued
current liabilities in respect of such obligations, in any case not overdue,
arising in the ordinary course of business; (iv) all obligations of such Person
under any lease (or other agreement conveying the right to use) of property by a
Person as lessee or guarantor which would, in conformity with generally accepted
accounting principles, be required to be accounted for as a capital lease on the
balance sheet of that Person; (v) all reimbursement obligations of such Person
in respect of any letters of credit or bankers' acceptances related to
Indebtedness of such Person or another Person; (vi) all Attributable Debt; (vii)
all Redeemable Stock and (viii) all guarantees of (a) obligations specified in
clauses (i) through (v) of this definition, (b) Attributable Debt and (c)
Redeemable Stock, in each case of other Persons.  The term "Indebtedness" shall
not include any obligations of a Person under a Swap Contract.

     "International Subsidiary" means any Subsidiary of the Company the
      ------------------------                                         
principal business of which is conducted, or the principal assets of which are
located, outside of the United States.

     "Lien" means any lien, mortgage, pledge, security interest, charge, or
      ----                                                                 
encumbrance of any kind (including any conditional sale or other title retention
agreement or any lease in the nature thereof) and any agreement to give any
lien, mortgage, pledge, security, interest, charge, or other encumbrance of any
kind.

     "Principal Property" means any land, land improvement, building and
      ------------------                                                
associated equipment or property owned or leased pursuant to a capital lease and
located within the United States of America and having a book value in excess of
3% of Consolidated Net Assets as of the date of such determination, but not
including any such property financed through the issuance of tax exempt
governmental obligations, or any such property that has been determined by
resolution of the Board of Directors of the Company not to be of material
importance to the respective businesses conducted by the Company and its
Designated Subsidiaries taken as a whole.

     "Redeemable Stock" means, with respect to any Person, any stock that by its
      ----------------                                                          
terms matures or is mandatorily redeemable pursuant to a sinking fund obligation
or otherwise.

     "Swap Contract" means any agreement relating to any transaction that is a
      -------------                                                           
rate swap, basis swap, forward rate transaction, commodity option, equity or
equity index swap or option, 

                                      -4-
<PAGE>
 
bond, note or bill option, interest rate option, forward transaction, cap,
collar or floor transaction, currency swap, cross-currency rate swap, swaption,
currency option or any other similar transaction (including any option to enter
into any of the foregoing) or any combination of the foregoing, and, unless the
context otherwise clearly requires, any master agreement relating to or
governing any or all of the foregoing, provided that such Swap Contract was
entered into for the purpose of managing risks associated with liabilities,
commitments or assets of the Company or any Subsidiary of the Company and not
for speculation.

     "Undesignated Subsidiary" means any Subsidiary of the Company that is not a
      -----------------------                                                   
Designated Subsidiary.

     (c) Section 402(3) of Article Four of the Indenture is amended to replace
the first sentence thereof as follows:

     Upon the Company's exercise of the above option applicable to this Section
402(3) with respect to any Securities of or within a series, the Company shall
be released from its obligations under Article Eight and Sections 102 and 1005
and, if applicable, Sections 1007 and 1008 and, to the extent specified pursuant
to Section 301, any other covenant applicable to such Securities, with respect
to such Outstanding Securities and any Coupons appertaining thereto on and after
the date the conditions set forth in clause (4) of this Section 402 are
satisfied (hereinafter, "covenant defeasance"), and such Securities and any
                         -------------------                               
Coupons appertaining thereto shall thereafter be deemed to be not "Outstanding"
for the purposes of any direction, waiver, consent or declaration or Act of
Holders (and the consequences of any thereof) in connection with any such
covenant, but shall continue to be deemed "Outstanding" for all other purposes
hereunder.

     (d) Article Ten of the Indenture is amended to add the following additional
sections at the end thereof as follows:

Section 1007.  Restrictions on Liens.
               --------------------- 

     Except as otherwise provided herein or pursuant hereto, the Company will
not, and will not permit any Designated Subsidiary to, incur any Indebtedness
secured by a Lien on any shares of stock, indebtedness or other obligations of a
Subsidiary or on any Principal Property of the Company or a Designated
Subsidiary (such stock, indebtedness or other obligations and Principal Property
being collectively referred to as "Property"), unless the Company secures or
causes such Designated Subsidiary to secure the Notes (together with, if the
Company shall so determine, any other Indebtedness of the Company or such
Designated Subsidiary then existing or thereafter created ranking equally with
the Notes, including guarantees of indebtedness of others) equally and ratably
with (or prior to) such Indebtedness, so long as such Indebtedness shall be so
secured; provided that such restrictions shall not apply in the case of
Indebtedness secured by: (i) Liens on Property existing at the time of
acquisition thereof or to secure the payment of all or any part of the purchase
price thereof or to secure any Indebtedness incurred prior to, at the time of or
within 180 days after the acquisition of such Property for the purpose of
financing all or any part of the purchase price thereof; (ii) Liens securing
Indebtedness owing by the Company to a Designated Subsidiary or by a Designated
Subsidiary to the Company or any 

                                      -5-
<PAGE>
 
other Designated Subsidiary; (iii) Liens on Property of any entity, or on the
stock, indebtedness or other obligations of such entity, existing at the time
(a) such entity becomes a Designated Subsidiary, (b) such entity is merged into
or consolidated with the Company or a Designated Subsidiary or (c) the Company
or a Designated Subsidiary acquires all or substantially all of the assets of
such entity, provided that no such Lien extends to any other Property; (iv)
Liens on Property to secure any Indebtedness incurred to provide funds for all
or any part of the cost of development of or improvements to such Property,
which Indebtedness is incurred prior to, at the time of or within 180 days after
the completion of such development or improvements; (v) any Lien on Property to
secure Indebtedness or other indebtedness incurred in connection with any
financing undertaken in accordance with Section 103 of the Internal Revenue Code
of 1986, as amended, or any replacement law; (vi) Liens securing obligations in
respect of capital leases on assets subject to such leases, provided that (a)
any such Lien attaches to such property within twelve months after the
acquisition thereof and (b) such Lien attaches solely to the property so
acquired; (vii) Liens securing indebtedness of a successor corporation to the
Company to the extent permitted by the Indenture; (viii) Liens created, incurred
or assumed in connection with an industrial revenue bond, pollution control bond
or similar financing arrangement between the Company or any Designated
Subsidiary and any federal, state or municipal government or other governmental
body or quasi-governmental agency; and (ix) any renewal, extension or
replacement (in whole or in part) of any Lien permitted pursuant to exceptions
(i) through (viii) above or of any Indebtedness secured thereby, provided that
such extension, renewal or replacement Lien shall be limited to all or any part
of the same Property that secured the Lien extended, renewed or replaced (plus
improvements on such Property). Notwithstanding the foregoing restrictions, the
Company may, and may permit any Designated Subsidiary to, incur Indebtedness
secured by Liens on Property which are not otherwise excepted without equally
and ratably securing the Notes, provided that the sum of all such Indebtedness
outstanding (including the amount then being incurred) does not exceed 10% of
Consolidated Net Assets immediately prior to the time such Indebtedness is
incurred.

Section 1008.  Restrictions on Sale and Leaseback Transactions.
               ----------------------------------------------- 

     Except as otherwise provided herein or pursuant hereto, the Company will
not, and will not permit any Designated Subsidiary to, enter into any
arrangement (except for temporary leases for a term of not more than three
years, or except for sale or transfer and leaseback transactions involving the
acquisition or improvement of Principal Properties provided that the amount of
consideration received at the time of sale or transfer by the Company or such
Designated Subsidiary for the property so sold or transferred shall be applied
as described in subsection (ii) below) with any bank, insurance company or other
lender or investor, or to which any such lender or investor is party, providing
for the leasing to the Company or any Designated Subsidiary of any Principal
Property which has been or is to be sold or transferred by the Company or any
Designated Subsidiary to such lender or investor or to any Person to whom funds
have been or are to be advanced by such lender or investor on the security of
such property unless either (i) the Company or any Designated Subsidiary could
create Indebtedness secured by a Lien under the provisions related to
restrictions on Liens on the property to be leased without equally and ratably
securing the Notes, or (ii) the Company and the Designated Subsidiaries within
the 12 months preceding such sale or transfer or the 12 months following such
sale or 

                                      -6-
<PAGE>
 
transfer, regardless of whether such sale or transfer may have been made by the
Company or by a Designated Subsidiary, have applied or apply an aggregate amount
equal to the greater of (a) the net proceeds of the sale of the property leased
pursuant to such arrangement or (b) the fair value of the property so leased at
the time of entering into such arrangement: (1) to the voluntary retirement of
Indebtedness of the Company or of a Designated Subsidiary which debt matures by
its terms more than one year after the date on which it was originally incurred;
or (2) to the acquisition, development or improvement of a Principal Property or
Principal Properties.


                                  PART THREE

                              ACCEPTANCE OF TRUST

     The Trustee accepts the trust hereby created and agrees to perform the same
upon the terms and conditions herein and in the Indenture set forth.

                                     * * *

     This First Supplemental Indenture may be executed in any number of
counterparts, each of which so executed shall be deemed to be an original, but
all such counterparts shall together constitute but one and the same instrument.



                 [Remainder of page intentionally left blank].

                                      -7-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed, all as of the day and year first above written.


                                                THERMO ELECTRON CORPORATION
 
 
                                                By: /s/ Kenneth J. Apicerno
                                                   ------------------------
                                                Name:  Kenneth J. Apicerno
                                                Title: Treasurer
(SEAL)
 
Attest:
 
 
/s/ Sandra L. Lambert
- --------------------- 
    Secretary
 
                                                BANKERS TRUST COMPANY, as 
                                                TRUSTEE
 
 
                                                By: /s/ Ednora G. Linares
                                                   ------------------------
                                                Name:  Ednora G. Linares
                                                Title: Assistant Vice President
(SEAL)
 
Attest:
 
 
/s/ Marc Parilla
- ---------------------

                                      -8-
<PAGE>
 
COMMONWEALTH OF MASSACHUSETTS     )
                                  )  : SS.:
COUNTY OF MIDDLESEX               )


          On the 27th day of October, 1998, before me personally came Kenneth J.
Apicerno, to me known, who, being by me duly sworn, did depose and say that he
is the Treasurer of Thermo Electron Corporation, a Delaware corporation, one of
the corporations described in and which executed the foregoing instrument; that
he knows the seal of said Corporation; that the seal affixed to said instrument
is such Corporation's seal; that it was so affixed by authority of the Board of
Directors of said Corporation; and that he signed his name thereto by like
authority.


                              /s/ Natalie J. Muecke
                              ---------------------------
                              Notary Public
                              Commission Expires: September 3, 2004

[NOTARIAL SEAL]



STATE OF NY    )
               )  : SS.:
COUNTY OF NY   )


          On the 29th day of October, 1998, before me personally came
Marc Parilla, to me known, who, being by me duly sworn, did depose and say
that he is Asst. Treasurer of Bankers Trust Company, a New York banking
corporation, one of the corporations described in and which executed the
foregoing instrument; that he knows the seal of said Corporation; that the seal
affixed to said instrument is such Corporation's seal; that it was so affixed by
authority of the Board of Directors of said Corporation; and that he signed his
name thereto by like authority.


                              /s/ Matthew Sherman
                              ---------------------------
                              Notary Public

                              Matthew Sherman
                              Notary Public, State of New York
                                No. O1SH5087362
                              Qualified in Westchester County
                              Commission Expires 11/3/99

[NOTARIAL SEAL]

                                      -9-

<PAGE>
 
                                                                     EXHIBIT 4.3
                                        

                            OFFICERS' CERTIFICATE OF
              THERMO ELECTRON CORPORATION PURSUANT TO SECTION 301
                       OF THE INDENTURE IDENTIFIED BELOW
                                        

     The undersigned John N. Hatsopoulos and Kenneth J. Apicerno as the Chief
Financial Officer and Treasurer, respectively, of Thermo Electron Corporation
("Company"), acting pursuant to authorizations contained in resolutions, copies
of which are delivered herewith, duly adopted on July 17, 1997, July 14, 1998
and August 21, 1998 by the Board of Directors of the Company, and on October 26,
1998 by the Pricing Committee thereof, do hereby authorize, adopt and approve
the following terms for a series (the "Series") of the Company's debt securities
(the "Securities") to be issued under a Senior Indenture dated as of October 29,
1998, as amended by the First Supplemental Indenture dated as of October 29,
1998 (collectively, the "Indenture"), from the Company, as issuer, to Bankers
Trust Company, as Trustee, pursuant to the Registration Statement on Form S-3
(No. 333-62957) under the Securities Act of 1933, as amended.  Terms used herein
without definition shall have the meanings ascribed to such terms in the
Indenture.  Article and Section references are to the Indenture.
<PAGE>
 
                                      -2-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    The title or designation of the             7.625% Notes due October 30, 2008 (the "Notes").
 301 (1)   Securities and the series in which the
           Securities shall be included:
- --------------------------------------------------------------------------------------------------------
Section    Any limit upon the aggregate principal      $150,000,000 aggregate principal amount.
 301 (2)   amount of the Securities of such title or
           designation or the Securities of such
           series which may be authenticated and
           delivered under the Indenture (except for
           Securities authenticated and delivered
           upon registration or transfer of, or in
           exchange for, or in lieu of, other
           Securities of such series pursuant to
           Section 304, 305, 306, 905 or 1107 of the
           Indenture, upon repayment in part of any
           Security of such series pursuant to
           Article Fifteen, or upon surrender in
           part of any Security for conversion or
           exchange into other securities pursuant
           to its terms, or pursuant to the terms of
           such Securities):
- --------------------------------------------------------------------------------------------------------
Section    If the Securities are to be issuable as     The Notes are to be issued only as Registered
 301 (3)   Registered Securities, as Bearer            Notes.
           Securities or alternatively as Bearer
           Securities and Registered Securities, and
           whether the Bearer Securities are to be
           issuable with Coupons, without Coupons or
           both, and any restrictions applicable to
           the offer, sale or delivery of the Bearer
           Securities and the terms, if any, upon
           which Bearer Securities may be exchanged
           for Registered Securities and vice versa:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -3-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    If any of the Securities are to be          Registered Notes are to be issued solely in
 301 (4)   issuable in global form, when any of such   permanent global form (except as otherwise
           Securities are to be issuable in global     specified in Section 305).  The Depository for
           form and (i) whether such Securities are    the Registered Notes is the Depository Trust
           to be issued in temporary or permanent      Company and any successor thereto.  Registered
           global form or both, (ii) the extent to     Notes shall be registered in the name of the
           which, or the manner in which, any          Depository or its nominee (except as otherwise
           interest payment or Additional Amounts on   specified in Section 305). Beneficial owners of
           a global Security on an Interest Payment    interests in the permanent global Registered
           Date will be paid and the manner in which   Notes may not exchange such interest for Notes,
           any principal of or premium, if any, on     except as specified in Section 305. The original
           any global Security will be paid, (iii)     issuance date for the Notes is October 29, 1998.
           whether beneficial owners of interests in                                                       
           any such global Security may exchange       Additional Amounts will not be payable on the       
           such interests for Securities of the same   Notes.                                              
           series and of like tenor and of any                                                              
           authorized form and denomination, and the   The Company will make all payments of principal      
           circumstances under which any such          and interest on the Notes in immediately             
           exchanges may occur, if other than in the   available funds so long as the Notes are             
           manner specified in Section 305 of the      maintained in book-entry form.                       
           Indenture, (iv) the name of the
           Depository or the U.S. Depository, as the
           case may be, with respect to any global
           Security and, if applicable, any
           successor to the Depository or U.S.
           Depository, (v) the name of the Common
           Depository, if applicable, and (vi) the
           Exchange Date, if applicable:
 
- --------------------------------------------------------------------------------------------------------
Section    If any of the Securities are to be          The Registered Notes in global form shall be
 301 (5)   issuable as Bearer Securities or in         dated the date of original issuance of the first
           global form, the date as of which any       of such Notes to be issued.  All other Notes
           such Bearer Security or global Security     shall be dated the date of their authentication.
           shall be dated (if other than the date of
           original issuance of the first of such
           Securities to be issued):
- --------------------------------------------------------------------------------------------------------

</TABLE> 

<PAGE>
 
                                      -4-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    If any of the Securities are to be          Not applicable.
 301 (6)   issuable as Bearer Securities, whether
           interest in respect of any portion of a
           temporary Bearer Security in global form
           payable in respect of an Interest Payment
           Date therefor prior to the Exchange Date,
           shall be paid to any clearing
           organization with respect to the portion
           of such temporary Bearer Security held
           for its account and, in such event, the
           terms and conditions (including any
           certification requirements) upon which
           any such interest payment received by a
           clearing organization will be credited to
           the Persons entitled to interest payable
           on such Interest Payment Date, if other
           than as provided in Section 304 of the
           Indenture:
- --------------------------------------------------------------------------------------------------------
Section    The date or dates, or the method or         The Stated Maturity of the principal of the
 301 (7)   methods, if any, by which the date or       Notes is October 30, 2008.
           dates shall be determined on which the
           principal of the Securities is payable:
- --------------------------------------------------------------------------------------------------------
Section    The rate or rates at which the Securities   The Notes shall bear interest at the per annum
 301 (8)   shall bear interest, if any, or the         rate of 7.625%. Interest shall accrue from the
           method or methods, if any, by which such    date of original issuance of the Notes. The
           rate or rates are to be determined; the     Interest Payment Dates for the Notes shall be
           date or dates, if any, from which such      April 30 and October 30, in each year,
           interest shall accrue or the method or      commencing April 30, 1999. The Regular Record
           methods, if any, by which such date or      Dates for the interest payable on such Interest
           dates are to be determined; the Interest    Payment Dates are April 15 and October 15,
           Payment Dates, if any, on which such        respectively.  Additional Amounts shall not be
           interest shall be payable and the Regular   payable on the Notes.
           Record Date, if any, for the interest
           payable on Registered Securities on any
           Interest Payment Date; whether and under
           what circumstances Additional Amounts on
           such Securities or any of them shall be
           payable; the notice, if any, to Holders
           regarding the determination of interest
           on a floating rate Security and the
           manner of giving such notice, and the
           basis upon which interest shall be
           calculated if other than that of a
           360-day year of twelve 30-day months:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -5-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    If in addition to or other than the         The Borough of Manhattan, The City of New York
 301 (9)   Borough of Manhattan, The City of New       shall be the place where principal of, any
           York (or, in the case of Bearer             premium and interest on the Notes shall be
           Securities, except as otherwise provided    payable, any of such Notes may be surrendered
           in the Indenture, London, England), the     for registration of transfer and exchange, any
           place or places where the principal of,     of such Notes may be surrendered for transfer or
           any premium and interest on or any          exchange in the circumstances described herein
           Additional Amounts with respect to such     and in the Indenture, and notices or demands to
           Securities shall be payable, any of such    or upon the Company in respect of such Notes and
           Securities may be surrendered for           the Indenture may be served.
           registration of transfer and exchange,      
           any of such Securities may be surrendered   Principal, premium (if any), and interest           
           for transfer, exchange or conversion in     payments with respect to a global Note will be      
           the circumstances described  herein and     paid in the manner set forth in the Indenture.      
           in the Indenture, and notices or demands                                                        
           to or upon the Company in respect of such   In the event the Note in permanent global form      
           Securities and the Indenture may be         is exchangeable for definitive Notes pursuant to    
           served:                                     Section 305 and the Notes are then listed on the    
                                                       Luxembourg Stock Exchange, Luxembourg shall be      
                                                       an additional place where the principal of, any     
                                                       premium and interest on the Notes shall be          
                                                       payable and any of such Notes may be surrendered    
                                                       for transfer or exchange in the circumstances       
                                                       described herein and in the Indenture.               

- --------------------------------------------------------------------------------------------------------
Section    Whether any of the Securities are to be     The Notes may be redeemed, at the option of the
 301 (10)  redeemable at the option of the Company     Company, in whole or in part at any time on the
           and, if so, the date or dates on which,     Redemption Date, upon notice as described in the
           the period or periods within which, the     Indenture, at the Redemption Price.
           price or prices at which and the other        
           terms and conditions upon which the         The Redemption Price shall be equal to the        
           Securities may be redeemed, in whole or     greater of (i) 100% of the principal amount of   
           in part, at the option of the Company       the Notes and (ii) the sum of the present values 
           and, if other than by a Company Board       of the remaining scheduled payments of principal 
           Resolution, the manner in which any         and interest thereon (not including the portion  
           election by the Company to redeem the       of any such payments of interest accrued as of   
           Securities shall be evidenced:              the Redemption Date) discounted to the           
                                                       Redemption Date on a semi-annual basis (assuming 
                                                       a 360-day year consisting of twelve 30-day       
                                                       months) at the Adjusted Treasury Rate (as        
                                                       defined below) (determined on the third Business 
                                                       Day preceding such Redemption Date), together,   
                                                       in each case, with accrued and unpaid interest   
                                                       to the Redemption Date.                           
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -6-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
                                                       "Adjusted Treasury Rate" means (i) the
                                                       arithmetic mean of the yields under the heading
                                                       "Week Ending" published in the Statistical
                                                       Release most recently published prior to the
                                                       date of determination under the caption
                                                       "Treasury Constant Maturities" for the maturity
                                                       (rounded to the nearest month) corresponding to
                                                       the remaining life to maturity, as of the
                                                       Redemption Date, of the Notes being redeemed
                                                       plus (ii) 0.30%.  If no maturity set forth under
                                                       such heading exactly corresponds to the maturity
                                                       of such Notes, yields for the two published
                                                       maturities most closely corresponding to the
                                                       maturity of such Notes shall be calculated by
                                                       the Company pursuant to the immediately
                                                       preceding sentence, and the Adjusted Treasury
                                                       Rate shall be interpolated or extrapolated from
                                                       such yields on a straight-line basis, rounding
                                                       in each of the relevant periods to the nearest
                                                       month.

                                                       "Statistical Release" means the statistical
                                                       release designated "H.15(519)" or any successor
                                                       publication which is published weekly by the
                                                       Federal Reserve System and which establishes
                                                       yields on actively-traded United States
                                                       government securities adjusted to the constant
                                                       maturities, or, if such statistical release is
                                                       not published at the time of any determination
                                                       under the terms of the Notes, then such other
                                                       reasonably comparable index which shall be
                                                       designated by the Company.
- --------------------------------------------------------------------------------------------------------
Section    If the Company is obligated to redeem or    Not applicable.
 301 (11)  purchase any of the Securities pursuant
           to any sinking fund or analogous
           provision or at the option of any Holder
           thereof (including under Article Fifteen
           of the Indenture) and, if so, the date or
           dates on which, the period or periods
           within which, the price or prices at
           which and the other terms and conditions
           upon which the Securities shall be
           redeemed or purchased, in whole or in
           part, pursuant to such obligation, and
           any provisions for the remarketing of the
           Securities so redeemed or purchased:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -7-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    The denominations in which any of the       None, except that the global Registered Note
 301 (12)  Securities that are Registered Securities   held by the Depository shall be in such
           shall be issuable if other than             principal amount as the officer(s) manually
           denominations of $1,000 and any integral    executing the same shall approve, their manual
           multiple thereof, and the denominations     execution thereof to be conclusive evidence of
           in which any of the Securities that are     such approval.
           Bearer Securities shall be issuable if
           other than the denominations of $1,000
           and $10,000:
- --------------------------------------------------------------------------------------------------------
Section    If other than the principal amount          Not applicable.
 301 (13)  thereof, the portion of the principal
           amount of any of the Securities that
           shall be payable upon declaration of
           acceleration of the Maturity thereof
           pursuant to Section 502 of the Indenture
           or the method by which such portion is to
           be determined:
- --------------------------------------------------------------------------------------------------------
Section    If the amount of payments of principal      Not applicable.
 301 (14)  of, any premium or interest on or any
           Additional Amounts with respect to the
           Securities may be determined with
           reference to an index, indices, formula
           or other method or methods (which index,
           indices, formula or method or methods may
           be based, without limitation, on one or
           more currencies, commodities, equity
           indices or other indices), and, if so,
           the terms and conditions upon which and
           the manner in which such amounts shall be
           determined and paid or payable:
- --------------------------------------------------------------------------------------------------------
Section    Any deletions from, modifications of or     As set forth in the First Supplemental Indenture.
 301 (15)  additions to the Events of Default or
           covenants of the Company with respect to
           any of the Securities, whether or not
           such Events of Default or covenants are
           consistent with the Events of Default or
           covenants set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -8-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    If either or both of Section 402(2)         Both Section 402(2) and Section 402(3) shall be
 301 (16)  relating to defeasance or Section 402(3)    applicable to the Notes.  Sections 801, 1007 and
           relating to covenant defeasance, as set     1008 shall be subject to covenant defeasance as
           forth in the Indenture, shall be            provided in the Indenture.
           applicable to the Securities, or any
           covenants in addition to those specified
           in Section 402(3) of the Indenture
           relating to the Securities which shall be
           subject to covenant defeasance, and any
           deletions from, or modifications or
           additions to, the provisions of Article
           Four of the Indenture in respect of the
           Securities shall apply:
- --------------------------------------------------------------------------------------------------------
Section    The terms, if any, on which the             Not applicable.
 301 (17)  Securities may be converted into or
           exchanged for other securities of the
           Company:
- --------------------------------------------------------------------------------------------------------
Section    If any of the Securities are to be          Not applicable.
 301 (18)  issuable in global form and are to be
           issuable in definitive form (whether upon
           original issue or upon exchange of a
           temporary Security) only upon receipt of
           certain certificates or other documents
           or satisfaction of other conditions, then
           the form and terms of such certificates,
           documents or conditions:
- --------------------------------------------------------------------------------------------------------
Section    If there is more than one Trustee, the      The Trustee is:
 301 (19)  identity of the Trustee and, if not the   
           Trustee, the identity of each Security      Bankers Trust Company 
           Registrar, Paying Agent, Conversion Agent   
           or Authenticating Agent with respect to     Four Albany Street  
           such Securities:                            4th Floor           
                                                       New York, NY  10006  

                                                       The Trustee shall initially be the Security 
                                                       Registrar, the Authenticating Agent and the 
                                                       Paying Agent with respect to the Notes.      

                                                       In the event the Note in permanent global form
                                                       is exchangeable for definitive Notes pursuant to
                                                       Section 305 and the Notes are then listed on the
                                                       Luxembourg Stock Exchange, Bankers Trust
                                                       Luxembourg, S.A. shall be an additional Paying
                                                       Agent.
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -9-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    [INTENTIONALLY OMITTED]
 301 (20)
- --------------------------------------------------------------------------------------------------------
Section    Any other terms of the Securities and any   The form of the Registered Note in global form
 301 (21)  deletions from or modifications or          is attached to this Certificate as Exhibit A.
           additions to the Indenture in respect of    The form of the definitive Registered Note,
           the Securities (which terms shall not be    which is to be used only if one of the
           inconsistent with the provisions of the     conditions set forth in the first sentence of
           Indenture, except as permitted by Section   the seventh paragraph of Section 305 of the
           901 thereof):                               Indenture has occurred, is attached to this
                                                       Certificate as Exhibit B.
- --------------------------------------------------------------------------------------------------------
Section    Definition of Business Day, if other than   Not applicable.
 101       as set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Definition of United States, if other       Not applicable.
 101       than as set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    The extent to which an Indexed Security     Not applicable.
 101       is deemed Outstanding, if other than as
           set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Whether an Opinion of Counsel may not be    Not applicable.
101        given by an employee of the Company:
 
- --------------------------------------------------------------------------------------------------------
Section    Whether actions by Holders may not be       Not applicable.
104        taken by proxy:
- --------------------------------------------------------------------------------------------------------
Section    Whether notice of any event given to        Not applicable.
106        Holders shall be in a manner different
           than as set forth in the Indenture:
 
- --------------------------------------------------------------------------------------------------------
Section    Payment or conversion on a day other than   Not applicable.
 114       a Business Day, if other than as set
           forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Whether the Securities initially shall be   Not applicable.
204        issued in other than global form:
 
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -10-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    Whether payment of principal of, any        Not applicable.
204        premium and (except for temporary global
           Bearer Securities) interest on, and any
           Additional Amounts in respect of, any
           temporary or permanent global Security
           shall be made to a Person or Persons
           other than the Person or Persons
           specified therein:
 
- --------------------------------------------------------------------------------------------------------
Section    The Persons whom the Trustee or any agent   Not applicable.
204        of the Company or the Trustee shall treat
           as the Holder of the principal amount of
           the temporary global Bearer Security:
 
- --------------------------------------------------------------------------------------------------------
Section    Whether temporary Securities (other than    Not applicable.
 304(b)    temporary global Bearer Securities),
           until exchanged for Definitive Securities
           of such series, will be entitled to the
           same benefits under the Indenture as
           Definitive Securities of such series:
- --------------------------------------------------------------------------------------------------------
Section    Whether temporary global Bearer             Not applicable.
 304(c)    Securities shall have the same rights and
           benefits as definitive Bearer Securities:
- --------------------------------------------------------------------------------------------------------
Section    The terms on which a permanent global       Not applicable.
 305       Registered Security shall be exchangeable
           for definitive Securities, if other than
           as set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    The terms under which holders of            Not applicable.
 305       definitive Registered Securities and
           Bearer Securities may exchange such
           interest for securities in global form,
           if other than as set forth in the
           Indenture:
- --------------------------------------------------------------------------------------------------------
Section    The terms on which interest on Bearer       Not applicable.
 306       Securities shall be paid without
           presentation and surrender of the
           applicable Coupon, if other than as set
           forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -11-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    The person or persons to receive payments   Not applicable.
 307(a)    with respect to Registered Securities, if
           other than the registered holder
           (including DTC) thereof on the Regular
           Record Date:
- --------------------------------------------------------------------------------------------------------
Section    Manner in which payments of interest        Not applicable.
 307(a)    shall be made if other than as set forth
           in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    The terms on which a Bearer Security may    Not applicable.
 307(a)    be exchanged for a Registered Security
           after a Regular Record Date and before an
           Interest Payment Date, if other than as
           set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Circumstances under which payments on a     Not applicable.
 307(a),   Bearer Security may be paid in the United
 1002      States, if other than as set forth in the
           Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Method of paying interest, by check or      Not applicable.
 307(a)    wire transfer or both, if other than as
           set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    The terms on which Defaulted Interest       Not applicable.
 307(b)    shall be paid with respect to Registered
           Securities, if other than as set forth in
           the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Whether Securities or Coupons shall be      Not applicable.
 309       authenticated in lieu of or in exchange
           for any Securities or Coupons canceled as
           provided in Section 309 of the Indenture,
           except as expressly permitted by or
           pursuant to the Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Qualifications for an Authenticating        Not applicable.
 612       Agent, if other than as set forth in the
           Indenture:
- --------------------------------------------------------------------------------------------------------
Section    Dates upon which the Company will furnish   Not applicable.
 701(1)    names and addresses of Holders, if other
           than as set forth in the Indenture:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -12-

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    Whether the Company shall be required to    As required by law or regulation.
 1004      make all payments of principal of,
           premium, if any, and interest on
           Securities of any series to a Holder
           thereof who is not a United States
           person, without set-off, counterclaim,
           fees, liabilities or similar deductions
           (including payments on redemption and
           repayment), and free and clear of, and
           without deduction or withholding for
           Taxes:
- --------------------------------------------------------------------------------------------------------
Section    If the Company or any agent of the          Additional Amounts will not be payable on the
 1004      Company is required by law or regulation    Notes.
           to make any deduction or withholding for
           or on account of Taxes, whether the
           Company shall pay such Additional Amounts
           as shall be necessary in order that the
           net amounts received by the Holders of
           the Securities of any series who are not
           United States Persons after such
           deduction or withholding shall equal the
           amount that would have been receivable
           thereunder in the absence of such
           deduction or withholding:
- --------------------------------------------------------------------------------------------------------
Section    Whether the covenant set forth in Section   The covenant set forth in Section 1007 shall be
 1007      1007 shall be for the benefit of the        for the benefit of the Notes.
           Securities:
- --------------------------------------------------------------------------------------------------------
Section    Whether the covenant set forth on Section   The covenant set forth in Section 1008 shall be
 1008      1008 covenant shall be for the benefit of   for the benefit of the Notes.
           the Securities:
- --------------------------------------------------------------------------------------------------------
Section    Whether the Company shall be required to    The Company shall not be required to deposit
 1105      deposit with the Trustee the accrued        with the Trustee the accrued interest on the
           interest on and any Additional Amounts      Notes being redeemed if the Redemption Date
           with respect to Securities being redeemed   shall be an Interest Payment Date.
           if the Redemption Date shall be an
           Interest Payment Date:
- --------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
                                      -13-

 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
<S>        <C>                                         <C>
Section    If other than as set forth in the           Not applicable.
 1106      Indenture, whether installments of
           interest on Bearer Securities whose
           Stated Maturity is on or prior to the
           Redemption Date shall be payable other
           than upon the presentation and surrender
           of the Coupons for such interest:
- --------------------------------------------------------------------------------------------------------
Section    If other than as set forth in the           Not applicable.
 1106      Indenture, whether installments of
           interest on Registered Securities whose
           Stated Maturity is on or prior to the
           Redemption Date shall be payable to the
           Holders of such Securities registered as
           such at the close of business on the
           Regular Record Date:
- --------------------------------------------------------------------------------------------------------
           Issue price to public of Securities of      99.724% of the principal amount of the Notes.
           the Series:
- --------------------------------------------------------------------------------------------------------
           Underwriters' commission or discount as a   0.65%.
           percentage of the principal amount of
           Securities of the Series to be issued:
- --------------------------------------------------------------------------------------------------------
</TABLE>



                  REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

<PAGE>
 
                                      -14-

 
  IN WITNESS WHEREOF, the undersigned have executed this Certificate on behalf
of the Company.



                              THERMO ELECTRON CORPORATION


                              By: /s/ John N. Hatsopoulos
                                  -----------------------
                                  Name:  John N. Hatsopoulos
                                  Title:  Chief Financial Officer


                              By: /s/ Kenneth J. Apicerno
                                  -----------------------
                                  Name:  Kenneth J. Apicerno
                                  Title:  Treasurer

Dated as of October 29, 1998

<PAGE>
 
                                                                       Exhibit A

                (FORM OF FACE OF REGISTERED GLOBAL SECURITIES)


Unless this Security is presented by an authorized representative of The
Depository Trust Company ("DTC"), 55 Water Street, New York, New York to the
issuer or its agent for registration of transfer, exchange or payment, and such
Security issued is registered in the name of CEDE & CO., or such other name as
requested by an authorized representative of DTC, ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL, since the
registered owner hereof, CEDE & CO., has an interest herein.

Unless and until this Security is exchanged in whole or in part for Securities
in certificated form, this Security may not be transferred except as a whole by
DTC to a nominee thereof or by a nominee thereof to DTC or another nominee of
DTC or by DTC or any such nominee to a successor of DTC or a nominee of such
successor.

                          THERMO ELECTRON CORPORATION
                    (Incorporated in the State of Delaware)
                                        

                                   __%  NOTE
                             DUE __________ , 200_


No. R-
       _______________

CUSIP:
       _______________

          Thermo Electron Corporation , a Delaware corporation (herein referred
to as the "Company," which term includes any successor corporation under the
Indenture referred to on the reverse hereof), for value received, hereby
promises to pay to Cede & Co. or registered assigns the principal sum of
$_______ (or any other amounts as are endorsed on the Schedule of Adjustments
hereto) on ____________ (the "Stated Maturity") upon the presentation and
surrender hereof, and to pay interest thereon from ______________ or from the
most recent Interest Payment Date to which interest has been paid or duly
provided for, semi-annually in arrears on _____ and ________ of each year (each,
an "Interest Payment Date"), commencing ________, at the rate of __% per annum,
until the principal hereof is paid or duly provided for. The interest so
payable, and punctually paid or duly provided for, on any Interest Payment Date
will, as provided in the Indenture, be paid to the Holder in whose name this
Security (or one or more Predecessor Securities) is registered at the close of
business on the Regular Record Date for such interest, which shall be the
________ or ______ (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date, by check mailed or delivered to the
address of the Person entitled thereto as such address shall appear in the
Security Register; provided, however, that such interest may be paid, at the
                  ------------------                                        
Company's option and with the consent of any Paying Agent, by transfer to an
account maintained by the Payee with a bank located in
<PAGE>
 
the United States. Any such interest not so punctually paid or duly provided for
shall forthwith cease to be payable to the Holder on such Regular Record Date,
and may be paid to the Holder in whose name this Security (or one or more
Predecessor Securities) is registered at the close of business on a Special
Record Date for the payment of such Defaulted Interest to be fixed by the
Trustee, notice whereof shall be given to Holders of Securities of this series
not less than 10 days prior to such Special Record Date, or may be paid at any
time in any other lawful manner not inconsistent with the requirements of any
securities exchange on which the Securities of this series may be listed, and
upon such notice as may be required by such exchange, all as more fully provided
in the Indenture. Interest will be computed on the basis of a 360-day year of
twelve 30-day months. All payments hereunder shall be made in United States
Dollars.

          Subject to the applicable provisions of the Indenture, the aggregate
principal amount represented by this global Security may be decreased to reflect
exchanges or partial redemptions, by endorsing the Schedule of Adjustments
hereto, and the principal amount hereof shall be deemed to be decreased for all
purposes by the amount so exchanged or redeemed, as applicable.

          Reference is hereby made to the further provisions of this Security
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

          Unless the Certificate of Authentication hereon has been executed by
the Trustee by manual signature of one of its authorized signatories, this
Security shall not be entitled to any benefit under the Indenture, or be valid
or obligatory for any purpose.

          IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its facsimile corporate seal.


Dated:_________________________                      THERMO ELECTRON CORPORATION

                                                     By:_______________________
Attest:                                                  Kenneth J. Apicerno
                                                         Treasurer
_______________________________
Secretary
 
[SEAL]

                                      -2-
<PAGE>
 
                         CERTIFICATE OF AUTHENTICATION

  This is one of the Securities of the series designated therein referred to in
the within-mentioned Indenture.

                              BANKERS TRUST COMPANY,
                              as Trustee


                              By:
                                 __________________________
                                 Authorized Officer


                                      -3-
<PAGE>
 
               (FORM OF REVERSE OF REGISTERED GLOBAL SECURITIES)

                          THERMO ELECTRON CORPORATION


          This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or more
series under an Indenture, as amended by the First Supplemental Indenture, and
as further supplemented by the Company's Officers' Certificate, each dated as of
_____________, 1998 (collectively, the "Indenture") by the Company, as issuer,
to Bankers Trust Company, as Trustee (herein called the "Trustee," which term
includes any successor trustee under the Indenture with respect to the series of
which this Security is a part), to which Indenture and all indentures
supplemental thereto reference is hereby made for a statement of the respective
rights, limitations of rights, duties and immunities thereunder of the Company,
the Trustee and the Holders of the Securities, and of the terms upon which the
Securities are, and are to be, authenticated and delivered. This Security is one
of the duly authorized series of Securities designated on the face hereof and
the aggregate principal amount of the Securities to be issued under such series
is limited to $____ (except for Securities authenticated and delivered upon
transfer of, or in exchange for, or in lieu of other Securities).  The Holders
of the Securities will be entitled to the benefits of, be bound by, and be
deemed to have notice of, all of the provisions of the Indenture.  A copy of the
Indenture is on file and may be inspected at the office of the Paying Agents
appointed by the Company.  All terms used in this Security that are defined in
the Indenture shall have the meanings assigned to them in the Indenture.

          The Securities are issuable as registered securities (the "Registered
Securities"), without Coupons, in denominations of U.S. $1,000 and integral
multiples thereof, except as otherwise provided in or pursuant to the Indenture.
The Registered Securities, and transfers thereof, shall be registered as
provided in the Indenture.  The registered holder of a Registered Security shall
(to the fullest extent permitted by applicable law) be treated at all times, by
all persons and for all purposes as the absolute owner of such Security,
regardless of any notice of ownership, theft or loss or of any writing thereon.

          The Securities are general, unsecured obligations of the Company.

          No Additional Amounts shall be paid on the Securities.

          If an Event of Default, as defined in the Indenture, shall occur and
be continuing, the principal of the Securities of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.

          The Indenture contains provisions for defeasance and covenant
defeasance with respect to this Security, in each case upon compliance with
certain conditions set forth therein.

          The Securities are not convertible into or exchangeable for the
Company's Common Stock and will not be entitled to the benefit of any sinking
fund.
<PAGE>
 
     The Securities may be redeemed as provided in or pursuant to the Indenture,
at the option of the Company, in whole or in part at any time on the Redemption
Date, upon notice as described in the Indenture, at the Redemption Price. The
Redemption Price shall be equal to the greater of (i) 100% of the principal
amount of the Securities and (ii) the sum of the present values of the remaining
scheduled payments of principal and interest thereon (not including the portion
of any such payments of interest accrued as of the Redemption Date) discounted
to the Redemption Date on a semi-annual basis (assuming a 360-day year
consisting of twelve 30-day months) at the Adjusted Treasury Rate (as defined
below) (determined on the third Business Day preceding such Redemption Date),
together, in each case, with accrued and unpaid interest to the Redemption Date.
"Adjusted Treasury Rate" means (i) the arithmetic mean of the yields under the
heading "Week Ending" published in the Statistical Release most recently
published prior to the date of determination under the caption "Treasury
Constant Maturities" for the maturity (rounded to the nearest month)
corresponding to the remaining life to maturity, as of the Redemption Date, of
the Securities being redeemed, plus (ii) 0.30%. If no maturity set forth under
such heading exactly corresponds to the maturity of such Securities, yields for
the two published maturities most closely corresponding to the maturity of such
Securities shall be calculated pursuant to the immediately preceding sentence,
and the Adjusted Treasury Rate shall be interpolated or extrapolated from such
yields on a straight-line basis, rounding in each of the relevant periods to the
nearest month. "Statistical Release" means the statistical release designated
"H.15(519)" or any successor publication which is published weekly by the
Federal Reserve System and which establishes yields on actively-traded United
States government securities adjusted to the constant maturities, or, if such
statistical release is not published at the time of any determination under the
terms of the Securities, then such other reasonably comparable index which shall
be designated by the Company. Notice of redemption will be given to Holders of
Securities, not less than 20 nor more than 60 days prior to the Redemption Date,
all as provided in the Indenture.

     The Place of Payment, place of registration of transfer and exchange and
the place of transfer and exchange for the Registered Securities shall be the
Borough of Manhattan, the City of New York, and the Corporate Trust Office of
the Trustee shall be the Company's Office or Agency in the Borough of Manhattan,
the City of New York for such purpose.

     The Trustee initially shall be the Security Registrar, the Authenticating
Agent, and a Paying Agent.  The Trustee presently has its Corporate Trust Office
at Four Albany Street, 4th Floor, New York, NY 10006.  In addition, the Company
has appointed Bankers Trust Luxembourg, S.A. as a Paying Agent.  Bankers Trust
Luxembourg, S.A.'s Office in Luxembourg is currently located at 14 Boulevard
F.D. Roosevelt, l-2450 Luxembourg.  The Company may subsequently appoint a new
Office or Agency with respect to the Registered Securities.

     The Indenture permits the amendment thereof and the modification of the
rights and obligations of the Company and the rights of the Holders of the
Securities under the Indenture at any time as specified therein. The Indenture
also contains provisions permitting the waiver of compliance by the company with
certain provisions of the Indenture. Furthermore, provisions in the Indenture
permit the waiver of certain past defaults under the Indenture and their
consequences.


                                      -5-
<PAGE>
 
     No reference herein to the Indenture and no provision of this Security or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of, premium, if any, and
interest, on this Security at the times, places and rates, and in the coin or
currency, herein and therein prescribed.

     The Indenture and the Securities shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts applicable to
agreements made and to be performed entirely in such Commonwealth except that
the rights, protections, obligations, indemnities and immunities of the Trustee
under the Indenture and the Securities shall be governed by the laws of the
State of New York, without regard to the principles of conflicts of laws of
either state.


                                      -6-
<PAGE>
 
                            SCHEDULE OF ADJUSTMENTS

<TABLE>
<CAPTION>
                                                        REMAINING
                    PRINCIPAL                        PRINCIPAL AMOUNT               NOTATION MADE
                    AMOUNT OF                         FOLLOWING SUCH                 ON BEHALF OF
DATE MADE           ADJUSTMENT                          ADJUSTMENT                   THE TRUSTEE
                   
<S>              <C>                                <C>                            <C>
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------      ------------------                 --------------------           ------------------
 
- ---------------------------------------------------------------------------------------------------
</TABLE>




                                      -7-
<PAGE>
 
                                TRANSFER NOTICE
                                        

FOR VALUE RECEIVED, the undersigned Holder hereby sell(s), assign(s) and
transfer(s) unto
________________________________________________________________________________
________________________________________________________________________________
_____________ whose taxpayer identification number is _____________________ and
whose address including postal/zip code is _____________________________________
the within Security and all rights thereunder, hereby irrevocably constituting
and appointing _____________________________ attorney-in-fact to transfer said
Security on the books of the Security Registrar with full power of substitution
in the premises.


Dated:                        Name:
      _______________              __________________________    
                              By:
                                   __________________________
                              Title:
                                    _________________________


                              NOTICE:  The signature of the Holder to this
                              assignment must correspond with the name as
                              written upon the face of the within instrument in
                              every particular, without enlargement or any
                              change whatsoever.

                              SIGNATURE GUARANTEED


                              _______________________________  
<PAGE>
 
                                                                       Exhibit B

                    (FORM OF FACE OF REGISTERED SECURITIES)


                          THERMO ELECTRON CORPORATION
                    (Incorporated in the State of Delaware)
                                        

                                   __%  NOTE
                             DUE __________ , 200_


No. R-
     _____________
 
CUSIP:
      ____________


          Thermo Electron Corporation , a Delaware corporation (herein referred
to as the "Company," which term includes any successor corporation under the
Indenture referred to on the reverse hereof), for value received, hereby
promises to pay to ____________ or registered assigns the principal sum of
$_______ on ____________ (the "Stated Maturity") upon the presentation and
surrender hereof, and to pay interest thereon from ______________ or from the
most recent Interest Payment Date to which interest has been paid or duly
provided for, semi-annually in arrears on _____ and ________ of each year (each,
an "Interest Payment Date"), commencing ________, at the rate of __% per annum,
until the principal hereof is paid or duly provided for. The interest so
payable, and punctually paid or duly provided for, on any Interest Payment Date
will, as provided in the Indenture, be paid to the Holder in whose name this
Security (or one or more Predecessor Securities) is registered at the close of
business on the Regular Record Date for such interest, which shall be the
________ or ______ (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date by check mailed or delivered to the address
of the Person entitled thereto as such address shall appear in the Security
Register; provided, however, that such interest may be paid, at the Company's
         --------- --------                                                  
option and with the consent of any Paying Agent, by transfer to an account
maintained by the Payee with a bank located inside the United States.  Any such
interest not so punctually paid or duly provided for shall forthwith cease to be
payable to the Holder on such Regular Record Date, and may be paid to the Holder
in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on a Special Record Date for the payment of
such Defaulted Interest to be fixed by the Trustee, notice whereof shall be
given to Holders of Securities of this series not less than 10 days prior to
such Special Record Date, or may be paid at any time in any other lawful manner
not inconsistent with the requirements of any securities exchange on which the
Securities of this series may be listed, and upon such notice as may be required
by such exchange, all as more fully provided in the Indenture.  Interest will be
computed on the basis of a 360-day year of twelve 30-day months. All payments
hereunder shall be made in United States Dollars.
<PAGE>
 
          Reference is hereby made to the further provisions of this Security
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

          Unless the Certificate of Authentication hereon has been executed by
the Trustee by manual signature of one of its authorized signatories, this
Security shall not be entitled to any benefit under the Indenture, or be valid
or obligatory for any purpose.

            IN WITNESS WHEREOF, the Company has caused this instrument to be
duly executed under its facsimile corporate seal.


Dated:_________________________                      THERMO ELECTRON CORPORATION

                                                     By:_______________________
Attest:                                                  Kenneth J. Apicerno
                                                         Treasurer

_______________________________
Secretary
 
[SEAL]


                                      -2-
<PAGE>
 
                         CERTIFICATE OF AUTHENTICATION

  This is one of the Securities of the series designated therein referred to in
the within-mentioned Indenture.

                              BANKERS TRUST COMPANY,
                              as Trustee


                              By:
                                 ____________________________
                                 Authorized Officer


                                      -3-
<PAGE>
 
                  (FORM OF REVERSE OF REGISTERED SECURITIES)

                          THERMO ELECTRON CORPORATION


          This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or more
series under an Indenture, as amended by the First Supplemental Indenture, and
as further supplemented by the Company's Officers' Certificate, each dated as of
_____________, 1998 (collectively, the "Indenture") by the Company, as issuer,
to Bankers Trust Company, as Trustee (herein called the "Trustee," which term
includes any successor trustee under the Indenture with respect to the series of
which this Security is a part), to which Indenture and all indentures
supplemental thereto reference is hereby made for a statement of the respective
rights, limitations of rights, duties and immunities thereunder of the Company,
the Trustee and the Holders of the Securities, and of the terms upon which the
Securities are, and are to be, authenticated and delivered. This Security is one
of the duly authorized series of Securities designated on the face hereof and
the aggregate principal amount of the Securities to be issued under such series
is limited to $____ (except for Securities authenticated and delivered upon
transfer of, or in exchange for, or in lieu of other Securities).  The Holders
of the Securities will be entitled to the benefits of, be bound by, and be
deemed to have notice of, all of the provisions of the Indenture.  A copy of the
Indenture is on file and may be inspected at the office of the Paying Agents
appointed by the company.  All terms used in this Security that are defined in
the Indenture shall have the meanings assigned to them in the Indenture.

          The Securities are issuable as registered securities (the "Registered
Securities"), without coupons, in denominations of U.S. $1,000 and integral
multiples thereof, except as otherwise provided in or pursuant to the Indenture.
The Registered Securities, and transfers thereof, shall be registered as
provided in the Indenture.  The registered holder of a Registered Security shall
(to the fullest extent permitted by applicable law) be treated at all times, by
all persons and for all purposes as the absolute owner of such Security,
regardless of any notice of ownership, theft or loss or of any writing thereon.

          The Securities are general, unsecured obligations of the Company.

          No additional amounts shall be paid on the Securities.

          If an Event of Default, as defined in the Indenture, shall occur and
be continuing, the principal of the Securities of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.

          The Indenture contains provisions for defeasance and covenant
defeasance with respect to this Security, in each case upon compliance with
certain conditions set forth therein.

          The Securities are not convertible into or exchangeable for the
Company's Common Stock and will not be entitled to the benefit of any sinking
fund.
<PAGE>
 
          The Securities may be redeemed as provided in the Indenture, at the
option of the Company, in whole or in part at any time on the Redemption Date,
upon notice as described in the Indenture, at the Redemption Price.  The
Redemption Price shall be equal to the greater of (i) 100% of the principal
amount of the Securities and (ii) the sum of the present values of the remaining
scheduled payments of principal and interest thereon (not including the portion
of any such payments of interest accrued as of the Redemption Date) discounted
to the redemption date on a semi-annual basis (assuming a 360-day year
consisting of twelve 30-day months) at the Adjusted Treasury Rate (as defined
below) (determined on the third business day preceding such Redemption Date),
together, in each case, with accrued and unpaid interest to the Redemption Date.
"Adjusted Treasury Rate" means (i) the arithmetic mean of the yields under the
heading "Week Ending" published in the Statistical Release most recently
published prior to the date of determination under the caption "Treasury
Constant Maturities" for the maturity (rounded to the nearest month)
corresponding to the remaining life to maturity, as of the Redemption Date, of
the Securities being redeemed, plus (ii) 0.30%.  If no maturity set forth under
such heading exactly corresponds to the maturity of such Securities, yields for
the two published maturities most closely corresponding to the maturity of such
Securities shall be calculated pursuant to the immediately preceding sentence,
and the adjusted treasury rate shall be interpolated or extrapolated from such
yields on a straight-line basis, rounding in each of the relevant periods to the
nearest month.  "Statistical Release" means the statistical release designated
"H.15(519)" or any successor publication which is published weekly by the
Federal Reserve System and which establishes yields on actively-traded United
States Government Securities adjusted to the constant maturities, or, if such
statistical release is not published at the time of any determination under the
terms of the Securities, then such other reasonably comparable index which shall
be designated by the Company.  Notice of redemption will be given to holders of
securities, not less than 20 nor more than 60 days prior to the Redemption Date,
all as provided in the Indenture.

     The Place of Payment, place of registration of transfer and exchange and
the place of transfer and exchange for the Registered Securities shall be the
Borough of Manhattan, The City of New York, and the Corporate Trust Office of
the Trustee shall be the Company's Office or Agency in the Borough of Manhattan,
the City of New York for such purpose.

     The Trustee initially shall be the Security Registrar, the Authenticating
Agent, and a Paying Agent.  The Trustee presently has its Corporate Trust Office
at Four Albany Street, 4th Floor, New York, NY 10006.  In addition, the Company
has appointed Bankers Trust Luxembourg, S.A. as a Paying Agent.  Bankers Trust
Luxembourg, S.A.'S Office in Luxembourg is currently located at 14 Boulevard
F.D. Roosevelt, L-2450 Luxembourg.  The Company may subsequently appoint a new
Office or Agency with respect to the Registered Securities.

     The Indenture permits the amendment thereof and the modification of the
rights and obligations of the Company and the rights of the Holders of the
Securities under the Indenture at any time as specified therein.  The Indenture
also contains provisions permitting the waiver of compliance by the Company with
certain provisions of the Indenture.  Furthermore, provisions in the Indenture
permit the waiver of certain past defaults under the Indenture and their
consequences.



                                      -2-
<PAGE>
 
     No reference herein to the Indenture and no provision of this Security or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of, premium, if any, and
interest, on this Security at the times, places and rates, and in the coin or
currency, herein and therein prescribed.

     The Indenture and the Securities shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts applicable to
agreements made and to be performed entirely in such Commonwealth except that
the rights, protections, obligations, indemnities and immunities of the Trustee
under the Indenture and the Securities shall be governed by the laws of the
State of New York, without regard to the principles of conflicts of laws of
either state.


                                      -3-
<PAGE>
 
                                TRANSFER NOTICE
                                        

FOR VALUE RECEIVED, the undersigned Holder hereby sell(s), assign(s) and
transfer(s) unto
________________________________________________________________________________
________________________________________________________________________________
_____________ whose taxpayer identification number is _____________________ and
whose address including postal/zip code is _____________________________________
the within Security and all rights thereunder, hereby irrevocably constituting
and appointing _____________________________ attorney-in-fact to transfer said
Security on the books of the Security Registrar with full power of substitution
in the premises.


Dated:                        Name:
      __________________            _____________________________
                              By:
                                   ______________________________
 
                              Title:
                                    _____________________________

                              NOTICE:  The signature of the Holder to this
                              assignment must correspond with the name as
                              written upon the face of the within instrument in
                              every particular, without enlargement or any
                              change whatsoever.

                              SIGNATURE GUARANTEED

                              ___________________________________
                                


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