THERMO ELECTRON CORP
8-K, 1998-04-07
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):

                                 April 6, 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                                      02254-9046
(Address of principal executive offices)                    (Zip Code)


                                (781) 622-1000
                        (Registrant's telephone number
                             including area code)
<PAGE>
 
Item 5.   Other Events
          ------------

     On April 6, 1998, Thermo Electron Corporation (the "Company") executed (i) 
an Underwriting Agreement (U.S. Version) by and among the Company, Goldman, 
Sachs & Co., Smith Barney Inc., Lehman Brothers Inc. and HSBC Securities, Inc. 
and (ii) an Underwriting Agreement (International Version) by and among the 
Company, Smith Barney Inc., Goldman Sachs International, Lehman Brothers 
International (Europe) and HSBC Securities, Inc. in connection with the 
Company's public offering of 6,500,000 shares (the "Shares") of its Common 
Stock, $1.00 par value per share, pursuant to the Company's shelf registration 
statement on Form S-3 (Reg. No. 333-32111).  The Shares will be sold at a price 
of $40.625 per share.  The closing of the offering is expected to take place on 
April 13, 1998.  The terms of the offering include an option, for thirty days, 
for the underwriters to purchase up to an additional 975,000 shares to cover 
over-allotments.

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 (U.S. Version), dated April 6, 1998, 
by and among the Company, Goldman, Sachs & Co., Smith Barney Inc., Lehman 
Brothers Inc. and HSBC Securities, Inc.

               1.2 Underwriting Agreement (International Version), dated April 
6, 1998, by and among the Company, Smith Barney Inc., Goldman Sachs 
International, Lehman Brothers International (Europe) and HSBC Securities, Inc.

<PAGE>
 
                                   SIGNATURE


     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 6th day of April, 1998.



                                             THERMO ELECTRON CORPORATION


                                             By: /s/ Sandra L. Lambert
                                                 -------------------------
                                                 Sandra L. Lambert
                                                 Secretary
<PAGE>
 
EXHIBIT INDEX

Exhibit No.       Description

   1.1  Underwriting Agreement (U.S. Version), dated April 6, 1998, by and among
the Company, Goldman, Sachs & Co., Smith Barney Inc., Lehman Brothers Inc. and
HSBC Securities, Inc.

   1.2  Underwriting Agreement (International Version), dated April 6, 1998, by 
and among the Company, Smith Barney Inc., Goldman Sachs International, Lehman 
Brothers International (Europe) and HSBC Securities, Inc.


<PAGE> 

                                                                     EXHIBIT 1.1
 
                          THERMO ELECTRON CORPORATION

                                 COMMON STOCK
                               ($1.00 PAR VALUE)

                            UNDERWRITING AGREEMENT
                                (U.S. VERSION)
                            ----------------------

                                                                  April 6, 1998

Goldman, Sachs & Co.,
Smith Barney Inc.,
Lehman Brothers Inc.,
HSBC Securities, Inc.,
 As representatives of the several Underwriters
 named in Schedule I hereto,
c/o Goldman, Sachs & Co.,
85 Broad Street,
New York, New York 10004.

Ladies and Gentlemen:

     Thermo Electron Corporation, a Delaware corporation (the "Company"),
proposes, subject to the terms and conditions stated herein, to issue and sell
to the Underwriters named in Schedule I hereto (the "Underwriters") an aggregate
of 5,200,000 shares (the "Firm Shares") and, at the election of the
Underwriters, up to 780,000 additional shares (the "Optional Shares") of Common
Stock, $1.00 par value ("Stock"), of the Company (the Firm Shares and the
Optional Shares that the Underwriters elect to purchase pursuant to Section 2
hereof, together with the accompanying rights to purchase a unit consisting of
one ten-thousandth of a share of the Company's Series B Junior Participating
Preferred Stock, being collectively called the "Shares").

     It is understood and agreed to by all parties that the Company is
concurrently entering into an agreement (the "International Underwriting
Agreement") providing for the sale by the Company of up to a total of 1,495,000
shares of Stock (the "International Shares"), including the overallotment option
thereunder, through arrangements with certain underwriters outside the United
States (the "International Underwriters"), for whom Goldman Sachs International,
Smith Barney Inc., Lehman Brothers International (Europe) and HSBC Securities,
Inc. are acting as lead managers.  Anything herein or therein to the contrary
notwithstanding, the respective closings under this Agreement and the
International Underwriting Agreement are hereby expressly made conditional on
one another.  The Underwriters hereunder and the International Underwriters are
simultaneously entering into an Agreement between U.S. and International
Underwriting Syndicates (the "Agreement between Syndicates") which provides,
among other things, for the transfer of shares of Stock between the two
syndicates.  Two 
<PAGE>
 
forms of prospectus supplement, together with a related prospectus, are to be
used in connection with the offering and sale of shares of Stock contemplated by
the foregoing, one relating to the Shares hereunder and the other relating to
the International Shares.  The latter form of prospectus supplement will be
identical to the former except for certain substitute pages included therein.
Except as used in Sections 2, 3, 4, 9 and 11 herein, and except as the context
may otherwise require, references hereinafter to the Shares shall include all
the shares of Stock which may be sold pursuant to either this Agreement or the
International Underwriting Agreement, and references herein to any prospectus or
prospectus supplement whether in preliminary or final form, and whether as
amended or supplemented, shall include both the U.S. and the international
versions thereof.

          1.   The Company represents and warrants to, and agrees with, each of
     the Underwriters that:

          (a)  A registration statement on Form S-3 (File No. 333-32111) in
     respect of the Shares has been filed with the Securities and Exchange
     Commission (the "Commission"); such registration statement and any post-
     effective amendment thereto, each in the form heretofore delivered or to be
     delivered to you, and, excluding exhibits to such registration statement,
     but including all documents incorporated by reference in the prospectus
     contained therein, to you for each of the other Underwriters, have been
     declared effective by the Commission in such form; no other document with
     respect to such registration statement or document incorporated by
     reference therein has heretofore been filed, or transmitted for filing,
     with the Commission (other than prospectuses filed pursuant to Rule 424(b)
     of the rules and regulations of the Commission under the Securities Act of
     1933, as amended (the "Act"), each in the form heretofore delivered to
     you); and no stop order suspending the effectiveness of such registration
     statement has been issued and no proceeding for that purpose has been
     initiated or threatened by the Commission (any preliminary prospectus
     included in such registration statement or filed with the Commission
     pursuant to Rule 424(a) or Rule 424(b) under the Act is hereinafter called
     a "Preliminary Prospectus"; the various parts of such registration
     statement, including all exhibits thereto and including the documents
     incorporated by reference in the prospectus contained in the registration
     statement at the time such part of the registration statement became
     effective, each as amended at the time such part of the registration
     statement became effective, are hereinafter collectively called the
     "Registration Statement"; the prospectus and prospectus supplement relating
     to the Shares, in the form in which it has most recently been filed, or
     transmitted for filing, with the Commission on or prior to the date of this
     Agreement, is hereinafter called the "Prospectus"; any reference herein to
     any Preliminary Prospectus or the Prospectus shall be deemed to refer to
     and include the documents incorporated by reference therein pursuant to
     Item 12 of Form S-3 under the Act; any reference to any amendment or
     supplement to any Preliminary Prospectus or the Prospectus shall be deemed
     to refer to and include any documents filed after the date of such
     Preliminary Prospectus or Prospectus, as the case may be, under the
     Securities Exchange Act of 1934, as amended (the "Exchange Act"), and
     incorporated by reference in such Preliminary Prospectus or Prospectus, as
     the case may be; any reference to any amendment to the Registration
     Statement shall be deemed to refer to and include any report of the Company
     filed pursuant to Section 13(a) or 15(d) of the Exchange Act after the
     effective date of the Registration Statement that is incorporated by
     reference in the Registration Statement; and any reference to the
     Prospectus as amended or supplemented shall be deemed to refer to the
     Prospectus as amended or 

                                       2
<PAGE>
 
     supplemented on or after the date hereof in relation to the Shares in the
     form in which it is filed with the Commission pursuant to Rule 424(b) under
     the Act in accordance with Section 5(a) hereof, including any documents
     incorporated by reference therein as of the date of such filing);

          (b)  The documents incorporated by reference in the Prospectus, when
     they became effective or were filed with the Commission, as the case may
     be, conformed in all material respects to the requirements of the 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 by
     reference in the Prospectus or any further amendment or supplement thereto,
     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 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; provided, however, that this representation and warranty shall
     not apply to any statements or omissions made in reliance upon and in
     conformity with information furnished in writing to the Company by an
     Underwriter through Goldman, Sachs & Co. expressly for use in the
     Prospectus as amended or supplemented relating to the Shares;

          (c)  The Registration Statement and the Prospectus conform, and any
     further amendments or supplements to the Registration Statement or the
     Prospectus will conform, in all material respects to the requirements of
     the Act and the rules and regulations of the Commission thereunder 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 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 not misleading; provided, however, that this representation and
     warranty shall not apply to any statements or omissions made in reliance
     upon and in conformity with information furnished in writing to the Company
     by an Underwriter through Goldman, Sachs & Co. expressly for use in the
     Prospectus as amended or supplemented relating to the Shares;

          (d)  Other than as set forth in the Prospectus, neither the Company
     nor any of its subsidiaries (any reference herein to the subsidiaries of
     the Company being deemed to include its direct and indirect subsidiaries)
     has sustained since the date of the latest audited financial statements
     included or incorporated by reference in the Prospectus any material 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, in each case which would
     have a Material Adverse Effect ("Material Adverse Effect" or "Material
     Adverse Change", as used herein, shall mean any material adverse change in,
     or material adverse effect on, the condition (financial or otherwise),
     business, properties, prospects, net worth or results of operations of the
     Company and its subsidiaries, taken as a whole); and, since the respective
     dates as of which information is given in the Registration Statement and
     the

                                       3
<PAGE>
 
     Prospectus, and otherwise than as set forth in or contemplated in the
     Prospectus, there has not been any material change in the capital stock of
     the Company or consolidated long-term debt of the Company and its
     subsidiaries, any Material Adverse Change or any development involving a
     prospective change reasonably likely to have a Material Adverse Effect;

          (e)  The Company and its subsidiaries have good and marketable title
     in fee simple to all real property and good and marketable title to all
     personal property owned by them, in each case free and clear of all liens,
     encumbrances and defects except such as are described in the Prospectus and
     such as would not have a Material Adverse Effect; and any real property and
     buildings held under lease by the Company and its subsidiaries are held by
     them under valid, subsisting and enforceable leases with such exceptions as
     are not material and do not interfere with the use made and proposed to be
     made of such property and buildings by the Company and its subsidiaries, in
     each case except such as would not have a Material Adverse Effect;

          (f)  The Company has been duly incorporated and is validly existing as
     a corporation in good standing under the laws of the jurisdiction of its
     incorporation, with corporate power and authority to own its properties and
     conduct its business as described in the Prospectus and all other power and
     authority to own its properties and conduct its business as described in
     the Prospectus except as described in the Prospectus and such as would not
     have a Material Adverse Effect, and has been duly qualified as a foreign
     corporation for the transaction of business and is in good standing under
     the laws of each other jurisdiction in which it owns or leases properties
     or conducts any business so as to require such qualification, or is subject
     to no material liability or disability by reason of the failure to be so
     qualified in any such jurisdiction; and each Significant Subsidiary of the
     Company (as defined in Rule 405 under the Act) has been duly incorporated
     and is validly existing as a corporation in good standing under the laws of
     its jurisdiction of incorporation;

          (g)  The Company has an authorized capitalization as set forth in the
     Prospectus, and all of the issued shares of capital stock of the Company
     have been duly and validly authorized and issued and are fully paid and
     non-assessable and conform, in all material respects, to the description of
     the Stock in the Prospectus; and all of the issued shares of capital stock
     of each Significant Subsidiary of the Company and each other subsidiary of
     the Company that is publicly held have been duly and validly authorized and
     issued, are fully paid and non-assessable and (except for directors'
     qualifying shares and shares subject to director, consultant or employee
     stock options, and except as set forth in or contemplated by the
     Prospectus) are owned directly or indirectly by the Company, free and clear
     of all liens, encumbrances, equities or claims;

          (h)  The unissued Shares to be issued and sold by the Company to the
     Underwriters hereunder and under the International Underwriting Agreement
     have been duly and validly authorized and, when issued and delivered
     against payment therefor as provided herein and in the International
     Underwriting Agreement, will be duly and validly issued and fully paid and
     non-assessable and will conform in all material respects to the description
     of the Stock contained in the Prospectus;

                                       4
<PAGE>
 
          (i)  The issue and sale of the Shares by the Company hereunder and
     under the International Underwriting Agreement and the compliance by the
     Company with all of the provisions of this Agreement and the International
     Underwriting Agreement and the consummation of the transactions herein and
     therein contemplated 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, 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 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, nor will such action result in any violation of
     the provisions of the corporate charter or by-laws of the Company or any
     statute or 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 properties; and no consent, approval,
     authorization, order, registration or qualification of or with any such
     court or governmental agency or body is required for the issue and sale of
     the Shares by the Company or the consummation by the Company of the
     transactions contemplated by this Agreement and the International
     Underwriting Agreement, except the registration under the Act of the Shares
     and such consents, approvals, authorizations, registrations or
     qualifications as may be required under state or foreign securities or Blue
     Sky laws in connection with the purchase and distribution of the Shares by
     the Underwriters and the International Underwriters;

          (j)  Except as described in the Prospectus, neither the Company nor
     any of its subsidiaries is in violation of its corporate charter or by-laws
     or in default in the performance or observance of any material obligation,
     agreement, covenant or condition contained in any indenture, mortgage, deed
     of trust, loan agreement, lease or other agreement or instrument to which
     it is a party or by which it or any of its properties may be bound, which
     default could reasonably be expected to have a Material Adverse Effect;

          (k)  The description of the Stock in the Company's Registration
     Statement on Form 8-A filed under the Exchange Act relating to the Stock
     and the statements set forth in the International Prospectus under the
     caption "Certain United States Income Tax Consequences to Non-United States
     Holders", insofar as they purport to constitute a summary of the terms of
     the Stock or to describe the provisions of the laws and documents referred
     to therein, are accurate, complete and fair;

          (l)  Other than as set forth or contemplated in the Prospectus, there
     are no legal or governmental proceedings pending to which the Company or
     any of its subsidiaries is a party or of which any property of the Company
     or any of its subsidiaries is the subject which are reasonably likely to,
     individually or in the aggregate, have a Material Adverse Effect; and, to
     the best of the Company's knowledge, no such proceedings are threatened or
     contemplated by governmental authorities or threatened by others;

          (m)  The Company is not and, after giving effect to the offering and
     sale of the Shares will not be, an "investment company" or an entity
     "controlled" by an "investment company", as such terms are defined in the
     Investment Company Act of 1940, as amended (the "Investment Company Act");

                                       5
<PAGE>
 
          (n)  Neither the Company nor any of its subsidiaries does business
     with the government of Cuba or with any person located in Cuba within the
     meaning of Section 517.075, Florida Statutes;

          (o)  Arthur Andersen LLP, who have certified certain financial
     statements of the Company and its subsidiaries, are independent public
     accountants as required by the Act and the rules and regulations of the
     Commission thereunder;

          (p)  Except as would not, individually or in the aggregate, have a
     Material Adverse Effect, (i) each of the Company and its subsidiaries has
     all certificates, consents, exemptions, orders, permits, licenses,
     authorizations, or other approvals (each, an "Authorization") of and from,
     and has made all declarations and filings with, all Federal, state, local
     and other governmental authorities, all self-regulatory organizations and
     all courts and other tribunals, necessary or required to engage in the
     business currently conducted by it in the manner described in the
     Prospectus, (ii) all such Authorizations are valid and in full force and
     effect, and (iii) each of the Company and its subsidiaries is in compliance
     in all material respects with the terms and conditions of all such
     Authorizations and with the rules and regulations of the regulatory
     authorities and governing bodies having jurisdiction with respect thereto;
     and

          (q)  Other than as set forth 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 reasonably be expected to have a
     Material Adverse Effect, and, other than as set forth 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.

     2.   Subject to the terms and conditions herein set forth, (a) the Company
agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Company, at
a purchase price per share of $40.625, the number of Firm Shares set forth
opposite the name of such Underwriter in Schedule I hereto and (b) in the event
and to the extent that the Underwriters shall exercise the election to purchase
Optional Shares as provided below, the Company agrees to issue and sell to each
of the Underwriters, and each of the Underwriters agrees, severally and not
jointly, to purchase from the Company, at the purchase price per share set forth
in clause (a) of this Section 2, that portion of the number of Optional Shares
as to which such election shall have been exercised (to be adjusted by you so as
to eliminate fractional shares) determined by multiplying such number of
Optional Shares by a fraction, the numerator of which is the maximum number of
Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule I hereto and the denominator
of which is the maximum number of Optional Shares that all of the Underwriters
are entitled to purchase hereunder.

     The Company hereby grants to the Underwriters the right to purchase at
their election up to 780,000 Optional Shares, at the purchase price per share
set forth in the paragraph above, for the sole purpose of covering
overallotments in the sale of the Firm Shares.  Any such election to purchase
Optional Shares may be exercised only by written notice from you to 

                                       6
<PAGE>
 
the Company given within a period of 30 calendar days after the date of this
Agreement, setting forth the aggregate number of Optional Shares to be purchased
and the date on which such Optional Shares are to be delivered, as determined by
you but in no event earlier than the First Time of Delivery (as defined in
Section 4 hereof) or, unless you and the Company otherwise agree in writing,
earlier than two or later than ten business days after the date of such notice.

     3.   Upon the authorization by you of the release of the Firm Shares, the
several Underwriters propose to offer the Firm Shares for sale upon the terms
and conditions set forth in the Prospectus as amended or supplemented.

     4.   (a)  The Shares to be purchased by each Underwriter hereunder, in
definitive form, and in such authorized denominations and registered in such
names as Goldman, Sachs & Co. may request upon at least forty-eight hours' prior
notice to the Company, shall be delivered by or on behalf of the Company to
Goldman, Sachs & Co., through the facilities of the Depository Trust Company
("DTC"), for the account of such Underwriter, against payment by or on behalf of
such Underwriter of the purchase price therefor by wire transfer of Federal
(same-day) funds to the account specified by the Company to Goldman, Sachs & Co.
at least forty-eight hours in advance.  The Company will cause the certificates
representing the Shares to be made available for checking and packaging at least
twenty-four hours prior to the Time of Delivery (as defined below) with respect
thereto at the office of DTC or its designated custodian (the "Designated
Office"). The time and date of such delivery and payment shall be, with respect
to the Firm Shares, 9:30 a.m., Eastern time, on April 13, 1998 or such other
time and date as Goldman, Sachs & Co. and the Company may agree upon in writing,
and, with respect to the Optional Shares, 9:30 a.m., Eastern time, on the date
specified by Goldman, Sachs & Co. in the written notice given by Goldman, Sachs
& Co. of the Underwriters' election to purchase such Optional Shares, or such
other time and date as Goldman, Sachs & Co. and the Company may agree upon in
writing. Such time and date for delivery of the Firm Shares is herein called the
"First Time of Delivery", such time and date for delivery of the Optional
Shares, if not the First Time of Delivery, is herein called the "Second Time of
Delivery", and each such time and date for delivery is herein called a "Time of
Delivery".

     (b)  The documents to be delivered at each Time of Delivery by or on behalf
of the parties hereto pursuant to Section 7 hereof, including the cross receipt
for the Shares and any additional documents requested by the Underwriters
pursuant to Section 7(j) hereof, will be delivered at the offices of Testa,
Hurwitz & Thibeault, LLP, 125 High Street, Boston, Massachusetts 02110 (the
"Closing Location"), and the Shares will be delivered at the Designated Office,
all at such Time of Delivery.  A meeting will be held at the Closing Location at
4:00 p.m., Eastern time, on the New York Business Day next preceding such Time
of Delivery, at which meeting the final drafts of the documents to be delivered
pursuant to the preceding sentence will be available for review by the parties
hereto.  For the purposes of this Agreement, "New York Business Day" shall mean
each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which
banking institutions in New York are generally authorized or obligated by law or
executive order to close.

     5.   The Company agrees with each of the Underwriters:

          (a)  To prepare the Prospectus as amended or supplemented in relation
     to the Shares in a form approved by you and to file such Prospectus
     pursuant to Rule 424(b) under the Act not later than the Commission's close
     of business on the second business day following the execution and delivery
     of this Agreement, or, if applicable, such earlier time as may be required
     by Rule 424(b) under the Act; to make no further 

                                       7
<PAGE>
 
     amendment or any supplement to the Registration Statement or Prospectus
     after the date of this Agreement and prior to the last Time of Delivery
     which shall be disapproved by you promptly after reasonable notice thereof;
     to advise you, 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 you 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 for so long as the delivery of a prospectus
     is required in connection with the offering or sale of the Shares; to
     advise you, 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 prospectus relating to the Shares, of the suspension of the
     qualification of the Shares for offering or sale in any jurisdiction, of
     the initiation or threatening of any proceeding for any such purpose, or of
     any request by the Commission for the amending or supplementing of the
     Registration Statement or 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 prospectus relating to the Shares or suspending
     any such qualification, promptly to use its best efforts to obtain the
     withdrawal of such order;

          (b)  Promptly from time to time to take such action as you may
     reasonably request to qualify the Shares for offering and sale under the
     securities laws of such jurisdictions as you may 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 Shares, provided 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;

          (c)  Prior to 10:00 a.m. Eastern time, on the second New York Business
     Day next succeeding the date of this Agreement and from time to time, to
     furnish the Underwriters with copies of the Prospectus as amended or
     supplemented in New York City in such quantities as you may reasonably
     request, and, if the delivery of a prospectus is required at any time in
     connection with the offering or sale of the Shares and if at such time any
     event 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 during such period 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 Act
     or the Exchange Act, to notify you and upon your reasonable request to file
     such document and to prepare and furnish without charge to each Underwriter
     and to any dealer in securities as many copies as you may from time to time
     reasonably request of an amended Prospectus or a supplement to the
     Prospectus which will correct such statement or omission or effect such
     compliance;

          (d)  To make generally available to its securityholders as soon as
     practicable, but in any event not later than eighteen months after the
     effective date of the Registration Statement (as defined in Rule 158(c)
     under the Act), an earnings statement of the Company and its subsidiaries
     (which need not be audited) complying 

                                       8
<PAGE>
 
     with Section 11(a) of the Act and the rules and regulations thereunder
     (including, at the option of the Company, Rule 158);

          (e)  During the period beginning from the date hereof and continuing
     to and including the date 90 days after the date of this Agreement, not to
     offer, sell, contract to sell or otherwise dispose of, except as provided
     hereunder and under the International Underwriting Agreement, any Stock or
     any securities of the Company that are substantially similar to the Shares,
     including but not limited to any securities that are convertible into or
     exchangeable for, or that represent the right to receive, Stock or any such
     substantially similar securities (except for shares of Stock issuable
     pursuant to convertible or exchangeable debt securities of the Company and
     its subsidiaries outstanding on the date of this Agreement, shares of Stock
     or options to purchase Stock issued pursuant to stock option, purchase and
     compensation plans in existence on the date of this Agreement and shares of
     Stock issued as consideration for the acquisition of one or more businesses
     provided that such Stock may not be resold prior to the expiration of the
     90-day period referenced above, without the prior written consent of
     Goldman, Sachs & Co.;

          (f)  To make available to its stockholders, by posting to the
     Company's Web site or otherwise, as soon as practicable after the end of
     each fiscal year an annual report (including a balance sheet and statements
     of income, stockholders' equity and cash flows of the Company and its
     consolidated subsidiaries certified by independent public accountants) and,
     as soon as practicable after the end of each of the first three quarters of
     each fiscal year (beginning with the fiscal quarter ending after the
     effective date of the Registration Statement), consolidated summary
     financial information of the Company and its subsidiaries for such quarter
     in reasonable detail;

          (g)  During a period of five years from the date of this Agreement, to
     furnish to you copies of all reports or other communications (financial or
     other) furnished by the Company to its stockholders generally, and to
     deliver to you (i) as soon as they are available, copies of any reports and
     financial statements furnished to or filed with the Commission or any
     national securities exchange on which any class of securities of the
     Company is listed; and (ii) such additional information concerning the
     business and financial condition of the Company as you may from time to
     time reasonably request (such financial statements to be on a consolidated
     basis to the extent the accounts of the Company and its subsidiaries are
     consolidated in reports furnished to its stockholders generally or to the
     Commission);

          (h)  To use the net proceeds received by it from the sale of the
     Shares pursuant to this Agreement and the International Underwriting
     Agreement in the manner specified in the Prospectus as amended or
     supplemented under the caption "Use of Proceeds"; and

          (i)  To use its best efforts to list, subject to notice of issuance,
     the Shares on the New York Stock Exchange.

     6.   The Company covenants and agrees with the several Underwriters that
the Company will pay or cause to be paid the following: (i) the fees,
disbursements and expenses of the Company's counsel and accountants in
connection with the registration of the Shares under the Act and all other
expenses in connection with the preparation, printing and filing of the
Registration Statement, any Preliminary Prospectus and the Prospectus and
amendments

                                       9
<PAGE>
 
and supplements thereto and the mailing and delivering of copies thereof to the
Underwriters and dealers; (ii) the cost of printing or producing any Agreement
among Underwriters, this Agreement, the International Underwriting Agreement,
the Agreement between Syndicates, the Selling Agreement, the Blue Sky
Memorandum, closing documents (including compilations thereof) and any other
documents in connection with the offering, purchase, sale and delivery of the
Shares; (iii) all expenses in connection with the qualification of the Shares
for offering and sale under state securities laws as provided in Section 5(b)
hereof, including the fees and disbursements of counsel for the Underwriters in
connection with such qualification and in connection with the Blue Sky survey;
(iv) all fees and expenses in connection with listing the Shares on the New York
Stock Exchange, and any filing fees incident to, and the fees and disbursements
of counsel for the Underwriters in connection with, securing any required review
by the National Association of Securities Dealers, Inc. of the terms of the sale
of the Shares; (v) the cost of preparing stock certificates; (vi) the cost and
charges of any transfer agent or registrar; and (vii) all other costs and
expenses incident to the performance of its obligations hereunder which are not
otherwise specifically provided for in this Section.  It is understood, however,
that, except as provided in this Section, and Sections 8 and 11 hereof, the
Underwriters will pay all of their own costs and expenses, including the fees of
their counsel, stock transfer taxes on resale of any of the Shares by them, and
any advertising expenses connected with any offers they may make.

     7.   The obligations of the Underwriters hereunder, as to the Shares to be
delivered at each Time of Delivery shall be subject, in their discretion, to the
condition that all representations and warranties and other statements of the
Company herein are, at and as of such Time of Delivery, true and correct, the
condition that the Company shall have performed all of its obligations hereunder
theretofore to be performed, and the following additional conditions:

          (a)  The Prospectus as amended or supplemented in relation to the
     Shares shall have been filed with the Commission pursuant to Rule 424(b)
     within the applicable time period prescribed for such filing by the rules
     and regulations under the Act and in accordance with Section 5(a) hereof;
     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 all requests
     for additional information on the part of the Commission shall have been
     complied with to your reasonable satisfaction;

          (b)  Testa, Hurwitz & Thibeault, LLP, counsel for the Underwriters,
     shall have furnished to you such written opinion or opinions, dated such
     Time of Delivery, with respect to the incorporation of the Company, the
     validity of the Shares, the Prospectus as amended or supplemented as well
     as such other related matters as you may reasonably request, and such
     counsel shall have received such papers and information as they may
     reasonably request to enable them to pass upon such matters;

          (c)  Seth H. Hoogasian, Vice President and General Counsel of the
     Company, shall have furnished to you his written opinion, dated such Time
     of Delivery, in form and substance reasonably satisfactory to you, to the
     effect that:

               (i)    The Company has been duly incorporated and is validly
          existing as a corporation in good standing under the laws of the
          jurisdiction of its incorporation, with corporate power and authority
          to own its properties and 

                                       10
<PAGE>
 
          conduct its business as described in the Prospectus as amended or
          supplemented;

               (ii)   The Company has an authorized capitalization as set forth
          in the Prospectus as amended or supplemented, and all of the issued
          shares of capital stock of the Company (including the Shares being
          delivered at such Time of Delivery) have been duly and validly
          authorized and issued and (to the best of such counsel's knowledge,
          except for the Shares being delivered at such Time of Delivery, as to
          which there shall be no such qualification) are fully paid and
          nonassessable; and the Shares conform, in all material respects, to
          the description of the Stock contained in the Prospectus as amended or
          supplemented;

               (iii)  The Company has been duly qualified as a foreign
          corporation for the transaction of business and is in good standing
          under the laws of each other jurisdiction in which it owns or leases
          properties or conducts any business so as to require such
          qualification, or is subject to no material liability or disability by
          reason of failure to be so qualified in any such jurisdiction;

               (iv)   Each Significant Subsidiary (as defined in Rule 405 under
          the Act) of the Company has been duly incorporated and is validly
          existing as a corporation in good standing under the laws of its
          jurisdiction of incorporation; and all of the issued shares of capital
          stock of each such subsidiary have been duly and validly authorized
          and issued, and, to the best of such counsel's knowledge, are fully
          paid and non-assessable;

               (v)    To the best of such counsel's knowledge and other than as
          set forth in the Prospectus as amended or supplemented, there are no
          legal or governmental proceedings pending to which the Company or any
          of its subsidiaries is a party or of which any property of the Company
          or any of its subsidiaries is the subject which is reasonably likely
          to, individually or in the aggregate, have a Material Adverse Effect;
          and, to the best of such counsel's knowledge, no such proceedings are
          threatened or contemplated by governmental authorities or threatened
          by others;

               (vi)   This Agreement and the International Underwriting
          Agreement have been duly authorized, executed and delivered by the
          Company;

               (vii)  The issue and sale of the Shares being delivered at such
          Time of Delivery by the Company and the compliance by the Company with
          all of the provisions of this Agreement and the International
          Underwriting Agreement and the consummation of the transactions herein
          and therein contemplated 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, mortgage, deed of trust, loan agreement
          or other agreement or instrument known to such counsel to which the
          Company or any of its Significant Subsidiaries is a party or by which
          the Company or any of its Significant Subsidiaries is bound or to
          which any of the property or assets of the Company or any of its
          Significant Subsidiaries is subject, nor will such action result in
          any violation of the provisions of the corporate charter or by-laws of
          the Company or any statute or any order, rule or 

                                       11
<PAGE>
 
          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 properties (no opinion being given as to
          statutes, rules and regulations relating to securities laws matters,
          which are addressed elsewhere in such opinion);

              (viii)  No consent, approval, authorization, order, registration
          or qualification of or with any such court or governmental agency or
          body is required for the issue and sale of the Shares by the Company
          or the consummation by the Company of the transactions contemplated by
          this Agreement and the International Underwriting Agreement, except
          the registration under the Act of the Shares, and such consents,
          approvals, authorizations, registrations or qualifications as may be
          required under state or foreign securities or Blue Sky laws in
          connection with the purchase and distribution of the Shares by the
          Underwriters and the International Underwriters;

               (ix)   Except as set forth in the Prospectus as amended or
          supplemented, to the best of such counsel's knowledge, neither the
          Company nor any of its Significant Subsidiaries is in violation of its
          corporate charter or by-laws or in default in the performance or
          observance of any material obligation, agreement, covenant or
          condition contained in any indenture, mortgage, deed of trust, loan
          agreement, lease or other agreement or instrument to which it is a
          party or by which it or any of its properties may be bound, which
          default could be reasonably be expected to have a Material Adverse
          Effect;

               (x)    The description of the Stock in the Company's Registration
          Statement on Form 8-A filed under the Exchange Act relating to the
          Stock and the statements set forth in the International Prospectus
          under the caption "Certain United States Income Tax Consequences to
          Non-United States Holders", insofar as they purport to constitute a
          summary of the terms of the Stock or to describe the provisions of the
          laws and documents referred to therein, are accurate, complete and
          fair in all material respects;

               (xi)   The Company is not an "investment company" or an entity
          "controlled" by an "investment company", as such terms are defined in
          the Investment Company Act;

               (xii)  The documents incorporated by reference in the Prospectus
          as amended or supplemented (other than the financial statements and
          the related notes, schedules and other financial data included or
          incorporated by reference therein, as to which such counsel need
          express no opinion), when they became effective or were filed with the
          Commission, as the case may be, complied as to form in all material
          respects with the requirements of the Act or the Exchange Act, as
          applicable, and the rules and regulations of the Commission
          thereunder; and he has no reason to believe that any of such
          documents, when such documents became effective or were so filed, as
          the case may be, contained, in the case of a registration statement
          which became effective under the Act, 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, or, in the case of other documents which were filed under
          the Exchange Act 

                                       12
<PAGE>
 
          with the Commission, an untrue statement of a material fact or omitted
          to state a material fact necessary in order to make the statements
          therein, in the light of the circumstances under which they were made
          when such documents were so filed, not misleading; and

               (xiii) The Registration Statement, the Prospectus and the
          Prospectus as amended or supplemented (other than the financial
          statements and the related notes, schedules and other financial data
          included or incorporated by reference therein, as to which such
          counsel need express no opinion) comply as to form in all material
          respects with the requirements of the Act and the rules and
          regulations thereunder; although he does not assume any responsibility
          for the accuracy, completeness or fairness of the statements contained
          in the Registration Statement, the Prospectus or the Prospectus as
          amended or supplemented, except for those referred to in the opinion
          in subsection (x) of this Section 7(c), he has no reason to believe
          that, as of its effective date, the Registration Statement or any
          further amendment thereto made by the Company prior to such Time of
          Delivery (other than the financial statements and the related notes,
          schedules and other financial data included or incorporated by
          reference therein, as to which such counsel need express no belief)
          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 or that, as of its date, the
          Prospectus or the Prospectus as amended or supplemented (other than
          the financial statements and the related notes, schedules and other
          financial data included or incorporated by reference therein, as to
          which such counsel need express no belief) contained an untrue
          statement of a material fact or omitted to state a material fact
          necessary to make the statements therein, in the light of the
          circumstances under which they were made, not misleading or that, as
          of any Time of Delivery, either the Registration Statement, the
          Prospectus or the Prospectus as amended or supplemented (other than
          the financial statements and related notes, schedules and other
          financial data included or incorporated by reference therein, as to
          which such counsel need express no belief) contains an untrue
          statement of a material fact or omits to state a material fact
          necessary to make the statements therein, in the light of the
          circumstances under which they were made, not misleading; and he does
          not know of any amendment to the Registration Statement required to be
          filed or of any contracts or other documents of a character required
          to be filed as an exhibit to the Registration Statement or required to
          be incorporated by reference into the Prospectus or required to be
          described in the Registration Statement, the Prospectus or the
          Prospectus as amended or supplemented which are not filed or
          incorporated by reference or described as required;

               The foregoing opinion of Seth H. Hoogasian may be limited to the
          laws of the Commonwealth of Massachusetts, the General Corporation Law
          of the State of Delaware and the Federal laws of the United States.
          In rendering any such opinion, such counsel may rely, as to matters of
          fact, to the extent such counsel deems proper, on certificates of
          responsible officers of the Company and its subsidiaries and of public
          officials.

                                       13
<PAGE>
 
          (d)  On the date (but prior to the execution) of this Agreement and at
     each Time of Delivery, Arthur Andersen LLP shall have furnished to you a
     letter or letters, dated the respective dates of delivery thereof, in form
     and substance satisfactory to you, to the effect set forth in Annex I
     hereto (the executed copy of the letter delivered prior to the execution of
     this Agreement is attached as Annex I(a) hereto and a draft of the form of
     letter to be delivered as of each Time of Delivery is attached as Annex
     I(b) hereto);

          (e)(i)  Neither the Company nor any of its subsidiaries shall have
     sustained since the date of the latest audited financial statements
     included or incorporated by reference in the Prospectus any material loss
     or interference with its business from fire, explosion, flood or other
     calamity, whether or not covered by insurance, or from any material labor
     dispute or court or governmental action, order or decree, otherwise than as
     set forth or contemplated in the Prospectus, and (ii) since the respective
     dates as of which information is given in the Prospectus there shall not
     have been any material adverse change in the capital stock  or long-term
     debt of the Company or any of its subsidiaries or any change, or any
     development involving a prospective material adverse change, in or
     affecting the general affairs, management, financial position,
     stockholders' equity or results of operations of the Company and its
     subsidiaries, otherwise than as set forth or contemplated in the
     Prospectus, the effect of which, in any such case described in Clause (i)
     or (ii), is in your judgment so material and adverse as to make it
     impracticable or inadvisable to proceed with the public offering or the
     delivery of the Shares being delivered at such Time of Delivery on the
     terms and in the manner contemplated in the Prospectus;

          (f)  On or after the date hereof (i) no downgrading shall have
     occurred in the rating accorded the Company's debt securities by any
     "nationally recognized statistical rating organization", as that term is
     defined by the Commission for purposes of Rule 436(g)(2) under the Act, 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 debt securities;

          (g)  On or after the date hereof there shall not have occurred any of
     the following: (i) a suspension or material limitation in trading in
     securities generally on the New York Stock Exchange; (ii) a suspension or
     material limitation in trading in the Company's securities on the New York
     Stock Exchange; (iii) a general moratorium on commercial banking activities
     declared by  Federal or New York or Massachusetts state authorities; or
     (iv) the outbreak or escalation of hostilities involving the United States
     or the declaration by the United States of a national emergency or war, if
     the effect of any such event specified in this Clause (iv) in your judgment
     makes it impracticable or inadvisable to proceed with the public offering
     or the delivery of the Shares being delivered at such Time of Delivery on
     the terms and in the manner contemplated in the Prospectus;

          (h)  The Shares to be sold at such Time of Delivery shall have been
     duly listed, subject to notice of issuance, on the New York Stock Exchange;

          (i)  The Company shall have complied with the provisions of Section
     5(c) hereof with respect to the furnishing of prospectuses on the second
     New York Business Day next succeeding the date of this Agreement;

                                       14
<PAGE>
 
          (j)  The Company shall have furnished or caused to be furnished to you
     at such Time of Delivery certificates of officers of the Company
     satisfactory to you as to the accuracy of the representations and
     warranties of the Company herein at and as of such Time of Delivery, as to
     the performance by the Company of all of its obligations hereunder to be
     performed at or prior to such Time of Delivery, as to the matters set forth
     in subsections (a) and (e) of this Section and as to such other matters as
     you may reasonably request.

          8.   (a)  The Company will indemnify and hold harmless each
     Underwriter against any losses, claims, damages or liabilities, joint or
     several, to which such Underwriter may become subject, under the Act or
     otherwise, insofar as such losses, claims, damages or liabilities (or
     actions in respect thereof) arise out of or are based upon an untrue
     statement or alleged untrue statement of a material fact contained in any
     Preliminary Prospectus, the Registration Statement, the Prospectus, the
     Prospectus as amended or supplemented, or any amendment or supplement to
     any thereof, or arise out of or are based upon the omission or alleged
     omission to state therein a material fact required to be stated therein or
     necessary to make the statements therein not misleading, and will reimburse
     each Underwriter for any legal or other expenses reasonably incurred by
     such Underwriter in connection with investigating or defending any such
     action or claim as such expenses are incurred; provided, however, that the
     Company shall not be liable in any such case to the extent that any such
     loss, claim, damage or liability arises out of or is based upon an untrue
     statement or alleged untrue statement or omission or alleged omission made
     in any Preliminary Prospectus, the Registration Statement, the Prospectus,
     the Prospectus as amended or supplemented or any such amendment or
     supplement in reliance upon and in conformity with written information
     furnished to the Company by any Underwriter through Goldman, Sachs & Co.
     expressly for use therein.

          (b)  Each Underwriter will indemnify and hold harmless the Company
     against any losses, claims, damages or liabilities to which the Company may
     become subject, under the Act or otherwise, insofar as such losses, claims,
     damages or liabilities (or actions in respect thereof) arise out of or are
     based upon an untrue statement or alleged untrue statement of a material
     fact contained in any Preliminary Prospectus, the Registration Statement,
     the Prospectus, the Prospectus as amended or supplemented, or any amendment
     or supplement to any thereof, or arise out of or are based upon the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading, in each case to the extent, but only to the extent, that such
     untrue statement or alleged untrue statement or omission or alleged
     omission was made in any Preliminary Prospectus, the Registration
     Statement, the Prospectus, the Prospectus as amended or supplemented or any
     such amendment or supplement in reliance upon and in conformity with
     written information furnished to the Company by such Underwriter through
     Goldman, Sachs & Co. expressly for use therein; and will reimburse the
     Company for any legal or other expenses reasonably incurred by the Company
     in connection with investigating or defending any such action or claim as
     such expenses are incurred.

          (c)  Promptly after receipt by an indemnified party under subsection
     (a) or (b) above of notice of the commencement of any action, such
     indemnified party shall, if a claim in respect thereof is to be made
     against the indemnifying party under such 

                                       15
<PAGE>
 
     subsection, notify the indemnifying party in writing of the commencement
     thereof; 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). In case any
     such action shall be brought against any indemnified party and it shall
     notify the indemnifying party of the commencement thereof, the indemnifying
     party shall be entitled to participate therein and, to the extent that it
     shall wish, jointly with any other indemnifying party similarly notified,
     to assume the defense thereof, with counsel satisfactory to such
     indemnified party (who shall not, except with the consent of the
     indemnified party, be counsel to the indemnifying party), and, after notice
     from the indemnifying party to such indemnified party of its election so to
     assume the defense thereof, the indemnifying party shall not be liable to
     such indemnified party under such subsection for any legal expenses of
     other counsel or any other expenses, in each case subsequently incurred by
     such indemnified party, in connection with the defense thereof other than
     reasonable costs of investigation.  For purposes of the preceding sentence,
     if one or more of the Underwriters is the indemnified party hereunder,
     Goldman, Sachs & Co. shall approve or consent to the selection of counsel
     on behalf of all Underwriters.  No indemnifying party shall, without the
     written consent of the indemnified party, effect the settlement or
     compromise of, or consent to the entry of any judgment with respect to, any
     pending or threatened action or claim in respect of which indemnification
     or contribution may be sought hereunder (whether or not the indemnified
     party is an actual or potential party to such action or claim) unless such
     settlement, compromise or judgment (i) includes an unconditional release of
     the indemnified party from all liability arising out of such action or
     claim and (ii) does not include a statement as to or an admission of fault,
     culpability or a failure to act, by or on behalf of any indemnified party.
     In addition, no indemnifying party shall be required to indemnify an
     indemnified party for any amount paid or payable by such indemnified party
     in the settlement of any action, proceeding, claim or investigation without
     the written consent of the indemnifying party.

          (d)  If the indemnification provided for in this Section 8 is
     unavailable to or insufficient to hold harmless an indemnified party under
     subsection (a) or (b) above in respect of any losses, claims, damages or
     liabilities (or actions in respect thereof) referred to therein, then each
     indemnifying party shall contribute to the amount paid or payable by such
     indemnified party as a result of such losses, claims, damages or
     liabilities (or actions in respect thereof) in such proportion as is
     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 Shares.
     If, however, the allocation provided by the immediately preceding sentence
     is not permitted by applicable law, then each indemnifying party shall
     contribute to such amount paid or payable by such indemnified party in such
     proportion as is appropriate to reflect not only such relative benefits but
     also the relative fault of the Company on the one hand and the Underwriters
     on the other in connection with the statements or omissions which resulted
     in such losses, claims, damages or liabilities (or actions 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 shall be deemed to be in the same proportion as
     the total net proceeds from the offering of the Shares purchased under this
     Agreement (before deducting expenses) received by the Company bear to the
     total 

                                       16
<PAGE>
 
     underwriting discounts and commissions received by the Underwriters with
     respect to the Shares purchased under this Agreement, in each case as set
     forth in the table on the cover page of the Prospectus as amended or
     supplemented.  The relative fault shall be determined by reference to,
     among other things, whether the untrue or alleged untrue statement of a
     material fact or the 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 and the parties' relative intent, 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 subsection (d) were
     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 account of the equitable considerations referred to above in
     this subsection (d).  The amount paid or payable by an indemnified party as
     a result of the losses, claims, damages or liabilities (or actions in
     respect thereof) referred to above in this subsection (d) shall be deemed
     to include 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 subsection (d), no
     Underwriter shall be required to contribute any amount in excess of the
     amount by which the total price at which the Shares underwritten by it and
     distributed to the public were offered to the public exceeds the amount of
     any damages which such Underwriter has otherwise been required to pay by
     reason of such 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 Act) shall be entitled to contribution from
     any person who was not guilty of such fraudulent misrepresentation.  The
     Underwriters' obligations in this subsection (d) to contribute are several
     in proportion to their respective underwriting obligations and not joint.

          (e)  The obligations of the Company under this Section 8 shall be in
     addition to any liability which the Company may otherwise have and shall
     extend, upon the same terms and conditions, to each person, if any, who
     controls any Underwriter within the meaning of the Act; and the obligations
     of the Underwriters under this Section 8 shall be in addition to any
     liability which the respective Underwriters may otherwise have and shall
     extend, upon the same terms and conditions, to each officer and director of
     the Company and to each person, if any, who controls the Company within the
     meaning of the Act; provided, however, that no such person to whom the
     benefits of this Section 8 shall so extend shall have the separate right to
     consent to or approve the selection of counsel referred to in the second
     sentence of Section 8(c) if Goldman, Sachs & Co. or any other Underwriter,
     or the Company, as the case may be, is also seeking indemnification
     hereunder.

          9.   (a)  If any Underwriter shall default in its obligation to
     purchase the Shares which it has agreed to purchase hereunder at a Time of
     Delivery, you may in your discretion arrange for you or another party or
     other parties to purchase such Shares on the terms contained herein. If
     within thirty-six hours after such default by any Underwriter you do not
     arrange for the purchase of such Shares, then the Company shall be entitled
     to a further period of thirty-six hours within which to procure another
     party or other parties satisfactory to you to purchase such Shares on such
     terms.  In the event that, within the respective prescribed periods, you
     notify the Company that you have so arranged for the purchase of such
     Shares, or the Company notifies you that it has so arranged for the
     purchase of such Shares, you or the Company shall 

                                       17
<PAGE>
 
     have the right to postpone such Time of Delivery for a period of not more
     than seven days, in order to effect whatever changes may thereby be made
     necessary in the Registration Statement or the Prospectus as amended or
     supplemented, or in any other documents or arrangements, and the Company
     agrees to file promptly any amendments to the Registration Statement or the
     Prospectus which in your reasonable opinion may thereby be made necessary.
     The term "Underwriter" as used in this Agreement shall include any person
     substituted under this Section with like effect as if such person had
     originally been a party to this Agreement with respect to such Shares.

          (b)  If, after giving effect to any arrangements for the purchase of
     the Shares of a defaulting Underwriter or Underwriters by you and the
     Company as provided in subsection (a) above, the aggregate number of such
     Shares which remains unpurchased does not exceed one-eleventh of the
     aggregate number of all the Shares to be purchased at such Time of
     Delivery, then the Company shall have the right to require each non-
     defaulting Underwriter to purchase the number of Shares which such
     Underwriter agreed to purchase hereunder at such Time of Delivery and, in
     addition, to require each non-defaulting Underwriter to purchase its pro
     rata share (based on the number of Shares which such Underwriter agreed to
     purchase hereunder) of the Shares of such defaulting Underwriter or
     Underwriters for which such arrangements have not been made; but nothing
     herein shall relieve a defaulting Underwriter from liability for its
     default.

          (c)  If, after giving effect to any arrangements for the purchase of
     the Shares of a defaulting Underwriter or Underwriters by you and the
     Company as provided in subsection (a) above, the aggregate number of such
     Shares which remains unpurchased exceeds one-eleventh of the aggregate
     number of all the Shares to be purchased at such Time of Delivery, or if
     the Company shall not exercise the right described in subsection (b) above
     to require non-defaulting Underwriters to purchase Shares of a defaulting
     Underwriter or Underwriters, then this Agreement (or, with respect to the
     Second Time of Delivery, the obligations of the Underwriters to purchase
     and of the Company to sell the Optional Shares) shall thereupon terminate,
     without liability on the part of any non-defaulting Underwriter or the
     Company, except for the expenses to be borne by the Company and the
     Underwriters as provided in Section 6 hereof and the indemnity and
     contribution agreements in Section 8 hereof; but nothing herein shall
     relieve a defaulting Underwriter from liability for its default.

     10.  The respective indemnities, agreements, representations, warranties
and other statements of the Company and the several Underwriters, as set forth
in this Agreement or made by or on behalf of them, respectively, pursuant to
this Agreement, shall remain in full force and effect, regardless of any
investigation (or any statement as to the results thereof) made by or on behalf
of any Underwriter or any controlling person of any Underwriter, or the Company,
or any officer or director or controlling person of the Company, and shall
survive delivery of and payment for the Shares.

     11.  If this Agreement shall be terminated pursuant to Section 9 hereof,
the Company shall not then be under any liability to any Underwriter except as
provided in Sections 6 and 8 hereof; but, if for any other reason, any Shares
are not delivered by or on behalf of the Company as provided herein, the Company
will reimburse the Underwriters through you for all out-of-pocket expenses
approved in writing by you, including fees and disbursements of counsel,
reasonably incurred by the Underwriters in making preparations for the purchase,
sale and delivery of the Shares not so delivered, but the Company shall then be
under no further 

                                       18
<PAGE>
 
liability to any Underwriter in respect of the Shares not so delivered except as
provided in Sections 6 and 8 hereof.

     12.  In all dealings hereunder, you shall act on behalf of each of the
Underwriters, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Underwriter made or
given by you by Goldman, Sachs & Co. on behalf of you as the representatives.

     All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to you as the representatives in care of Goldman, Sachs &
Co., 85 Broad Street, New York, New York  10004, Attention: Registration
Department; and 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; provided, however, that any
notice to an Underwriter pursuant to Section 8(c) hereof shall be delivered or
sent by mail, telex or facsimile transmission to such Underwriter at its address
set forth in its Underwriters' Questionnaire, or telex constituting such
Questionnaire, which address will be supplied to the Company by you upon
request.  Any such statements, requests, notices or agreements shall take effect
at the time of receipt thereof.

     13.  This Agreement shall be binding upon, and inure solely to the benefit
of, the Underwriters, the Company and, to the extent provided in Sections 8 and
10 hereof, the officers and directors of the Company and each person who
controls the Company or any Underwriter, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement.  No purchaser of any of the
Shares from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

     14.  Time shall be of the essence of this Agreement.  As used herein, the
term "business day" shall mean any day when the Commission's office in
Washington, D.C.  is open for business.

     15.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK.

     16.  This Agreement may be executed by any one or more of the parties
hereto in any number of counterparts, each of which shall be deemed to be an
original, but all such counterparts shall together constitute one and the same
instrument.

                                       19
<PAGE>
 
     If the foregoing is in accordance with your understanding, please sign and
return to us seven counterparts hereof, and upon the acceptance hereof by you,
on behalf of each of the Underwriters, this letter and such acceptance hereof
shall constitute a binding agreement between each of the Underwriters and the
Company.  It is understood that your acceptance of this letter on behalf of each
of the Underwriters is pursuant to the authority set forth in a form of
Agreement among Underwriters (U.S. Version), the form of which shall be
submitted to the Company for examination upon request, but without warranty on
your part as to the authority of the signers thereof.

                                       Very truly yours,

                                       Thermo Electron Corporation

                                       By: /s/ Gary S. Weinstein
                                           ------------------------
                                           Name:  Gary S. Weinstein
                                           Title: Vice President
Accepted as of the date hereof:

Goldman, Sachs & Co.
Smith Barney Inc.
Lehman Brothers Inc.
HSBC Securities, Inc.


By: /s/ Goldman, Sachs & Co.
   ------------------------------------ 
       (Goldman, Sachs & Co.)

  On behalf of each of the Underwriters

                                       20
<PAGE>
 
                                  SCHEDULE I
<TABLE> 
<CAPTION> 
                                                           Number of Optional
                                                              Shares to be
                                       Total Number of        Purchased if
                                         Firm Shares         Maximum Option
              Underwriter              to be Purchased         Exercised
              -----------              ----------------    -------------------
<S>                                    <C>                 <C>
Goldman, Sachs & Co................      1,185,600               177,840
Smith Barney Inc...................      1,185,600               177,840
Lehman Brothers Inc................      1,185,600               177,840 
HSBC Securities, Inc...............        603,200                90,480 
Barrington Research Associates,                          
 Inc...............................        208,000                31,200 
CIBC Oppenheimer Corp..............        208,000                31,200
Fahnestock & Co., Inc..............        208,000                31,200
Gilford Securities Incorporated....        208,000                31,200 
Gruntal & Co., L.L.C. .............        208,000                31,200
                                        ----------               -------
          Total....................     $5,200,000               780,000
                                        ==========               =======
</TABLE>

                                       21

<PAGE>
 
                                                                         ANNEX I

     Pursuant to Section 7(d) of the Underwriting Agreement, Arthur Andersen LLP
shall furnish letters to the Underwriters to the effect that:

          (i)    They are independent certified public accountants with respect
     to the Company and its subsidiaries within the meaning of the Act and the
     applicable published rules and regulations thereunder;

          (ii)   In their opinion, the financial statements and any
     supplementary financial information and schedules (and, if applicable,
     financial forecasts and/or pro forma financial information) examined by
     them and included or incorporated by reference in the Registration
     Statement or the Prospectus comply as to form in all material respects with
     the applicable accounting requirements of the Act or the Exchange Act, as
     applicable, and the related published rules and regulations thereunder;
     and, if applicable, they have made a review in accordance with standards
     established by the American Institute of Certified Public Accountants of
     the consolidated interim financial statements, selected financial data, pro
     forma financial information, financial forecasts and/or condensed financial
     statements derived from audited financial statements of the Company for the
     periods specified in such letter, as indicated in their reports thereon,
     copies of which have been separately furnished to the representatives of
     the Underwriters (the "Representatives");

          (iii)  The unaudited selected financial information with respect to
     the consolidated results of operations and financial position of the
     Company for the five most recent fiscal years included in the Prospectus
     and included or incorporated by reference in Item 6 of the Company's Annual
     Report on Form 10-K for the most recent fiscal year agrees with the
     corresponding amounts (after restatement where applicable) in the audited
     consolidated financial statements for such five fiscal years which were
     included or incorporated by reference in the Company's Annual Reports on
     Form 10-K for such fiscal years;

          (iv)   They have compared the information in the Prospectus under
     selected captions with the disclosure requirements of Regulation S-K and on
     the basis of limited procedures specified in such letter nothing came to
     their attention as a result of the foregoing procedures that caused them to
     believe that this information does not conform in all material respects
     with the disclosure requirements of Items 301, 302, 402 and 503(d),
     respectively, of Regulation S-K;

          (v)    On the basis of limited procedures, not constituting an
     examination in accordance with generally accepted auditing standards,
     consisting of a reading of the unaudited financial statements and other
     information referred to below, a reading of the latest available interim
     financial statements of the Company and its subsidiaries, inspection of the
     minute books of the Company and its subsidiaries since the date of the
     latest audited financial statements included or incorporated by reference
     in the Prospectus, inquiries of officials of the Company and its
     subsidiaries responsible for financial and accounting matters and such
     other inquiries and procedures as may be specified in such letter, nothing
     came to their attention that caused them to believe that:

                                       1
<PAGE>
 
               (A)  any unaudited pro forma consolidated condensed financial
          statements included or incorporated by reference in the Prospectus do
          not comply as to form in all material respects with the applicable
          accounting requirements of the Act and the published rules and
          regulations thereunder or the pro forma adjustments have not been
          properly applied to the historical amounts in the compilation of those
          statements;

               (B)  as of a specified date not more than five days prior to the
          date of such letter, there have been any changes in the capital stock
          of the Company (other than issuances of capital stock upon exercise of
          stock options and upon conversions of convertible securities, in each
          case which were outstanding on the date of the latest balance sheet
          included or incorporated by reference in the Prospectus) or any
          increase in the consolidated long-term debt of the Company and its
          subsidiaries, or any decreases in consolidated net current assets or
          stockholders' equity or other items specified by the Representatives,
          or any increases in any items specified by the Representatives, in
          each case as compared with amounts shown in the latest balance sheet
          included or incorporated by reference in the Prospectus, except in
          each case for changes, increases or decreases which the Prospectus
          discloses have occurred or may occur or which are described in such
          letter; and

               (C)  for the period from the date of the latest financial
          statements included or incorporated by reference in the Prospectus to
          the specified date referred to in Clause (B) there were any decreases
          in consolidated net revenues or operating income or the total or per
          share amounts of consolidated net income or other items specified by
          the Representatives, or any increases in any items specified by the
          Representatives, in each case as compared with the comparable period
          of the preceding year and with any other period of corresponding
          length specified by the Representatives, except in each case for
          increases or decreases which the Prospectus discloses have occurred or
          may occur or which are described in such letter.

          (vi)   In addition to the examination referred to in their report(s)
     included or incorporated by reference in the Prospectus and the limited
     procedures, inspection of minute books, inquiries and other procedures
     referred to in paragraphs (iii) and (vi) above, they have carried out
     certain specified procedures, not constituting an examination in accordance
     with generally accepted auditing standards, with respect to certain
     amounts, percentages and financial information specified by the
     Representatives which are derived from the general accounting records of
     the Company and its subsidiaries, which appear in the Prospectus (excluding
     documents incorporated by reference) or in Part II of, or in exhibits and
     schedules to, the Registration Statement specified by the Representatives
     or in documents incorporated by reference in the Prospectus specified by
     the Representatives, and have compared certain of such amounts, percentages
     and financial information with the accounting records of the Company and
     its subsidiaries and have found them to be in agreement.

                                       2

<PAGE>

                                                                     EXHIBIT 1.2
 
                          THERMO ELECTRON CORPORATION

                                 COMMON STOCK
                               ($1.00 PAR VALUE)

                            UNDERWRITING AGREEMENT
                            (INTERNATIONAL VERSION)
                            -----------------------

                                                                   April 6, 1998
Smith Barney Inc.,
Goldman Sachs International,
Lehman Brothers International (Europe),
HSBC Securities, Inc.,
 As representatives of the several Underwriters
   named in Schedule I hereto,
c/o Smith Barney Inc.,
Victoria Plaza,
111 Buckingham Palace Road,
London SW1W 0SB England.

Ladies and Gentlemen:

     Thermo Electron Corporation, a Delaware corporation (the "Company"),
proposes, subject to the terms and conditions stated herein, to issue and sell
to the Underwriters named in Schedule I hereto (the "Underwriters") an aggregate
of 1,300,000 shares (the "Firm Shares") and, at the election of the
Underwriters, up to 195,000 additional shares (the "Optional Shares") of Common
Stock, $1.00 par value (the "Stock"), of the Company (the Firm Shares and the
Optional Shares which the Underwriters elect to purchase pursuant to Section 2
hereof, together with the accompanying rights to purchase a unit consisting of
one ten-thousandth of a share of the Company's Series B Junior Participating
Preferred Stock, being collectively called the "Shares").

     It is understood and agreed to by all parties that the Company is
concurrently entering into an agreement, a copy of which is attached hereto (the
"U.S. Underwriting Agreement"), providing for the offering by the Company of up
to a total of 5,980,000 shares of Stock (the "U.S. Shares") including the
overallotment option thereunder through arrangements with certain underwriters
in the United States (the "U.S. Underwriters"), for whom Goldman, Sachs & Co.,
Smith Barney Inc., Lehman Brothers Inc. and HSBC Securities, Inc. are acting as
representatives.  Anything herein and therein to the contrary notwithstanding,
the respective closings under this Agreement and the U.S. Underwriting Agreement
are hereby expressly made conditional on one another.  The Underwriters
hereunder and the U.S. Underwriters are simultaneously entering into an
Agreement between U.S. and International Underwriting Syndicates (the "Agreement
between Syndicates") which provides, among other things, for the transfer of
shares of Stock between the two syndicates and for consultation by the lead
managers hereunder with Goldman, Sachs & Co. prior to exercising the rights of
the Underwriters under Section 7 hereof.  Two forms of prospectus supplement,
together with a related prospectus, are to be used in connection with the
offering and sale of shares of Stock contemplated by the foregoing, one relating
to the Shares hereunder and the other relating to 

                                       1
<PAGE>
 
the U.S. Shares. The latter form of prospectus supplement will be identical to
the former except for certain substitute pages as included in the registration
statement and amendments thereto as mentioned below. Except as used in Sections
2, 3, 4, 9 and 11 herein, and except as the context may otherwise require,
references hereinafter to the Shares shall include all of the shares of Stock
which may be sold pursuant to either this Agreement or the U.S. Underwriting
Agreement, and references herein to any prospectus or prospectus supplement
whether in preliminary or final form, and whether as amended or supplemented,
shall include both of the U.S. and the international versions thereof.

     In addition, this Agreement incorporates by reference certain provisions
from the U.S. Underwriting Agreement (including the related definitions of
terms, which are also used elsewhere herein) and, for purposes of applying the
same, references (whether in these precise words or their equivalent) in the
incorporated provisions to the "Underwriters" shall be to the Underwriters
hereunder, to the "Shares" shall be to the Shares hereunder as just defined, to
"this Agreement" (meaning therein the U.S. Underwriting Agreement) shall be to
this Agreement (except where this Agreement is already referred to or as the
context may otherwise require) and to the representatives of the Underwriters or
to Goldman, Sachs & Co. (except in Section 5(e) of the U.S. Underwriting
Agreement) shall be to the addressees of this Agreement and to Smith Barney Inc.
("SSB International"), and, in general, all such provisions and defined terms
shall be applied mutatis mutandis as if the incorporated provisions were set
forth in full herein having regard to their context in this Agreement as opposed
to the U.S. Underwriting Agreement.

     1.  The Company hereby makes with the Underwriters the same
representations, warranties and agreements as are set forth in Section 1 of the
U.S. Underwriting Agreement, which Section is incorporated herein by this
reference.

     2.  Subject to the terms and conditions herein set forth, (a) the Company
agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Company, at
a purchase price per share of $40.625, the number of Firm Shares set forth
opposite the name of such Underwriter in Schedule I hereto and (b) in the event
and to the extent that the Underwriters shall exercise the election to purchase
Optional Shares as provided below, the Company agrees to issue and sell to each
of the Underwriters, and each of the Underwriters agrees, severally and not
jointly, to purchase from the Company, at the purchase price per share set forth
in clause (a) of this Section 2, that portion of the number of Optional Shares
as to which such election shall have been exercised (to be adjusted by you so as
to eliminate fractional shares) determined by multiplying such number of
Optional Shares by a fraction the numerator of which is the maximum number of
Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule I hereto and the denominator
of which is the maximum number of Optional Shares that all of the Underwriters
are entitled to purchase hereunder.

     The Company hereby grants to the Underwriters the right to purchase at
their election up to 195,000 Optional Shares, at the purchase price per share
set forth in the paragraph above, for the sole purpose of covering
overallotments in the sale of the Firm Shares.  Any such election to purchase
Optional Shares may be exercised only by written notice from you to the Company,
given within a period of 30 calendar days after the date of this Agreement,
setting forth the aggregate number of Optional Shares to be purchased and the
date on which such Optional Shares are to be delivered, as determined by you but
in no event earlier than the First Time of Delivery (as defined in Section 4
hereof) or, unless you and the Company otherwise agree in writing, earlier than
two or later than ten business days after the date of such notice.

                                       2
<PAGE>
 
     3.  Upon the authorization by SSB International of the release of the Firm
Shares, the several Underwriters propose to offer the Firm Shares for sale upon
the terms and conditions set forth in the Prospectus as amended or supplemented
and in the forms of Agreement among Underwriters (International Version) and
Selling Agreements, which have been previously submitted to the Company by you.
Each Underwriter hereby makes to and with the Company the representations and
agreements of such Underwriter as a member of the selling group contained in
Sections 3(d) and 3(e) of the form of Selling Agreements.

     4.  (a) The Shares to be purchased by each Underwriter hereunder, in
definitive form, and in such authorized denominations and registered in such
names as SSB International may request upon at least forty-eight hours' prior
notice to the Company shall be delivered by or on behalf of the Company to SSB
International, through the facilities of the Depository Trust Company ("DTC"),
for the account of such Underwriter, against payment by or on behalf of such
Underwriter of the purchase price therefor by wire transfer of Federal (same-
day) funds to the account specified by the Company to Goldman, Sachs & Co. at
least forty-eight hours in advance.  The Company will cause the certificates
representing the Shares to be made available for checking and packaging at least
twenty-four hours prior to the Time of Delivery (as defined below) with respect
thereto at the office of DTC or its designated custodian (the "Designated
Office").  The time and date of such delivery and payment shall be, with respect
to the Firm Shares, 9:30 a.m., Eastern time, on April 13, 1998 or such other
time and date as SSB International and the Company may agree upon in writing,
and, with respect to the Optional Shares, 9:30 a.m., Eastern time, on the date
specified by SSB International in the written notice given by SSB International
of the Underwriters' election to purchase such Optional Shares, or such other
time and date as SSB International and the Company may agree upon in writing.
Such time and date for delivery of the Firm Shares is herein called the "First
Time of Delivery", such time and date for delivery of the Optional Shares, if
not the First Time of Delivery, is herein called the "Second Time of Delivery",
and each such time and date for delivery is herein called a "Time of Delivery".

     (b) The documents to be delivered at each Time of Delivery by or on behalf
of the parties hereto pursuant to Section 7 of the U.S. Underwriting Agreement,
including the cross receipt for the Shares and any additional documents
requested by the Underwriters pursuant to Section 7(j) of the U.S. Underwriting
Agreement, will be delivered at the offices of Testa, Hurwitz & Thibeault, LLP,
125 High Street, Boston, Massachusetts 02110 (the "Closing Location"), and the
Shares will be delivered at the Designated Office, all at such Time of Delivery.
A meeting will be held at the Closing Location at 4:00 p.m., Eastern time, on
the New York Business Day next preceding such Time of Delivery, at which meeting
the final drafts of the documents to be delivered pursuant to the preceding
sentence will be available for review by the parties hereto.  For the purposes
of this Section 4, "New York Business Day" shall mean each Monday, Tuesday,
Wednesday, Thursday and Friday which is not a day on which banking institutions
in New York are generally authorized or obligated by law or executive order to
close.

     5.  The Company hereby makes to the Underwriters the same agreements as are
set forth in Section 5 of the U.S. Underwriting Agreement, which Section is
incorporated herein by this reference.

     6.  The Company and the Underwriters hereby agree with respect to certain
expenses on the same terms as are set forth in Section 6 of the U.S.
Underwriting Agreement, which Section is incorporated herein by this reference.

                                       3
<PAGE>
 
     7.  Subject to the provisions of the Agreement between Syndicates, the
obligations of the Underwriters hereunder shall be subject, in their discretion,
at each Time of Delivery, to the condition that all representations and
warranties and other statements of the Company herein are, at and as of such
Time of Delivery, true and correct, the condition that the Company shall have
performed all of its obligations hereunder theretofore to be performed, and
additional conditions identical to those set forth in Section 7 of the U.S.
Underwriting Agreement, which Section is incorporated herein by this reference.

     8.  (a)  The Company will indemnify and hold harmless each Underwriter
against any losses, claims, damages or liabilities, joint or several, to which
such Underwriter may become subject, under the Act or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon an untrue statement or alleged untrue statement of a
material fact contained in any Preliminary Prospectus, the Registration
Statement, the Prospectus, the Prospectus as amended or supplemented, or any
amendment or supplement to any thereof, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and
will reimburse each Underwriter for any legal or other expenses reasonably
incurred by such Underwriter in connection with investigating or defending any
such action or claim as such expenses are incurred; provided, however, that the
Company shall not be liable in any such case to the extent that any such loss,
claim, damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in any Preliminary
Prospectus, the Registration Statement, the Prospectus, the Prospectus as
amended or supplemented or any such amendment or supplement in reliance upon and
in conformity with written information furnished to the Company by any
Underwriter through SSB International expressly for use therein.

     (b) Each Underwriter will indemnify and hold harmless the Company against
any losses, claims, damages or liabilities to which the Company may become
subject, under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon an
untrue statement or alleged untrue statement of a material fact contained in any
Preliminary Prospectus, the Registration Statement, the Prospectus, the
Prospectus as amended or supplemented or any amendment or supplement thereto, or
arise out of or are based upon the omission or alleged omission to state therein
a material fact required to be stated therein or necessary to make the
statements therein not misleading, in each case to the extent, but only to the
extent, that such untrue statement or alleged untrue statement or omission or
alleged omission was made in any Preliminary Prospectus, the Registration
Statement, the Prospectus, the Prospectus as amended or supplemented or any such
amendment or supplement in reliance upon and in conformity with written
information furnished to the Company by such Underwriter through SSB
International expressly for use therein; and will reimburse the Company for any
legal or other expenses reasonably incurred by the Company in connection with
investigating or defending any such action or claim as such expenses are
incurred.

     (c) Promptly after receipt by an indemnified party under subsection (a) or
(b) above of notice of the commencement of any action, such indemnified party
shall, if a claim in respect thereof is to be made against the indemnifying
party under such subsection, notify the indemnifying party in writing of the
commencement thereof; 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).  In case any 

                                       4
<PAGE>
 
such action shall be brought against any indemnified party and it shall notify
the indemnifying party of the commencement thereof, the indemnifying party shall
be entitled to participate therein and, to the extent that it shall wish,
jointly with any other indemnifying party similarly notified, to assume the
defense thereof, with counsel satisfactory to such indemnified party (who shall
not, except with the consent of the indemnified party, be counsel to the
indemnifying party), and, after notice from the indemnifying party to such
indemnified party of its election so to assume the defense thereof, the
indemnifying party shall not be liable to such indemnified party under such
subsection for any legal expenses of other counsel or any other expenses, in
each case subsequently incurred by such indemnified party, in connection with
the defense thereof other than reasonable costs of investigation. For purposes
of the preceding sentence, if one or more of the Underwriters is the indemnified
party hereunder, Smith Barney Inc. shall approve or consent to the selection of
counsel on behalf of all Underwriters. No indemnifying party shall, without the
written consent of the indemnified party, effect the settlement or compromise
of, or consent to the entry of any judgment with respect to, any pending or
threatened action or claim in respect of which indemnification or contribution
may be sought hereunder (whether or not the indemnified party is an actual or
potential party to such action or claim) unless such settlement, compromise or
judgment (i) includes an unconditional release of the indemnified party from all
liability arising out of such action or claim and (ii) does not include a
statement as to or an admission of fault, culpability or a failure to act, by or
on behalf of any indemnified party. In addition, no indemnifying party shall be
required to indemnify an indemnified party for any amount paid or payable by
such indemnified party in the settlement of any action, proceeding, claim or
investigation without the written consent of the indemnifying party.

     (d) If the indemnification provided for in this Section 8 is unavailable to
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above in respect of any losses, claims, damages or liabilities (or actions
in respect thereof) referred to therein, then each indemnifying party shall
contribute to the amount paid or payable by such indemnified party as a result
of such losses, claims, damages or liabilities (or actions in respect thereof)
in such proportion as is 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 Shares.  If, however, the allocation provided by the immediately
preceding sentence is not permitted by applicable law,  then each indemnifying
party shall contribute to such amount paid or payable by such indemnified party
in such proportion as is appropriate to reflect not only such relative benefits
but also the relative fault of the Company on the one hand and the Underwriters
on the other in connection with the statements or omissions which resulted in
such losses, claims, damages or liabilities (or actions 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 shall
be deemed to be in the same proportion as the total net proceeds from the
offering of the Shares purchased under this Agreement (before deducting
expenses) received by the Company bear to the total underwriting discounts and
commissions received by the Underwriters with respect to the Shares purchased
under this Agreement, in each case as set forth in the table on the cover page
of the Prospectus as amended or supplemented relating to such Shares. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the 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 and the parties'
relative intent, 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 subsection
(d) were determined by pro rata allocation (even if the 

                                       5
<PAGE>
 
Underwriters were treated as one entity for such purpose) or by any other method
of allocation which does not take account of the equitable considerations
referred to above in this subsection (d). The amount paid or payable by an
indemnified party as a result of the losses, claims, damages or liabilities (or
actions in respect thereof) referred to above in this subsection (d) shall be
deemed to include 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 subsection (d), no Underwriter
shall be required to contribute any amount in excess of the amount by which the
total price at which the Shares underwritten by it and distributed to the public
were offered to the public exceeds the amount of any damages which such
Underwriter has otherwise been required to pay by reason of such 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 Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation. The Underwriters' obligations in this subsection
(d) to contribute are several in proportion to their respective underwriting
obligations and not joint.

     (e) The obligations of the Company under this Section 8 shall be in
addition to any liability which the Company may otherwise have and shall extend,
upon the same terms and conditions, to each person, if any, who controls any
Underwriter within the meaning of the Act; and the obligations of the
Underwriters under this Section 8 shall be in addition to any liability which
the respective Underwriters may otherwise have and shall extend, upon the same
terms and conditions, to each officer and director of the Company and to each
person, if any, who controls the Company within the meaning of the Act;
provided, however, that no such person to whom the benefits of this Section 8
shall so extend shall have the separate right to consent to or approve the
selection of counsel referred to in the second sentence of Section 8(c) if Smith
Barney Inc. or any other Underwriter, or the Company, as the case may be, is
also seeking indemnification hereunder.

     9.  (a)  If any Underwriter shall default in its obligation to purchase the
Shares which it has agreed to purchase hereunder at a Time of Delivery, you may
in your discretion arrange for you or another party or other parties to purchase
such Shares on the terms contained herein.  If within thirty-six hours after
such default by any Underwriter you do not arrange for the purchase of such
Shares, then the Company shall be entitled to a further period of thirty-six
hours within which to procure another party or other parties satisfactory to you
to purchase such Shares on such terms. In the event that, within the respective
prescribed periods, you notify the Company that you have so arranged for the
purchase of such Shares, or the Company notifies you that it has so arranged for
the purchase of such Shares, you or the Company shall have the right to postpone
such Time of Delivery for a period of not more than seven days, in order to
effect whatever changes may thereby be made necessary in the Registration
Statement or the Prospectus, or in any other documents or arrangements, and the
Company agrees to file promptly any amendments to the Registration Statement or
the Prospectus which in your reasonable opinion may thereby be made necessary.
The term "Underwriter" as used in this Agreement shall include any person
substituted under this Section with like effect as if such person had originally
been a party to this Agreement with respect to such Shares.

     (b) If, after giving effect to any arrangements for the purchase of the
Shares of a defaulting Underwriter or Underwriters by you and the Company as
provided in subsection (a) above, the aggregate number of such Shares which
remains unpurchased does not exceed one-eleventh of the aggregate number of all
the Shares to be purchased at such Time of Delivery, then the Company shall have
the right to require each non-defaulting Underwriter to 

                                       6
<PAGE>
 
purchase the number of shares which such Underwriter agreed to purchase
hereunder at such Time of Delivery and, in addition, to require each non-
defaulting Underwriter to purchase its pro rata share (based on the number of
Shares which such Underwriter agreed to purchase hereunder) of the Shares of
such defaulting Underwriter or Underwriters for which such arrangements have not
been made; but nothing herein shall relieve a defaulting Underwriter from
liability for its default.

     (c)  If, after giving effect to any arrangements for the purchase of the
Shares of a defaulting Underwriter or Underwriters by you and the Company as
provided in subsection (a) above, the aggregate number of such Shares which
remains unpurchased exceeds one-eleventh of the aggregate number of all the
Shares to be purchased at such Time of Delivery, or if the Company shall not
exercise the right described in subsection (b) above to require non-defaulting
Underwriters to purchase Shares of a defaulting Underwriter or Underwriters,
then this Agreement (or, with respect to the Second Time of Delivery, the
obligation of the Underwriters to purchase and of the Company to sell the
Optional Shares) shall thereupon terminate, without liability on the part of any
non-defaulting Underwriter or the Company, except for the expenses to be borne
by the Company and the Underwriters as provided in Section 6 hereof and the
indemnity and contribution agreements in Section 8 hereof; but nothing herein
shall relieve a defaulting Underwriter from liability for its default.

     10.  The respective indemnities, agreements, representations, warranties
and other statements of the Company and the several Underwriters, as set forth
in this Agreement or made by or on behalf of them, respectively, pursuant to
this Agreement, shall remain in full force and effect, regardless of any
investigation (or any statement as to the results thereof) made by or on behalf
of any Underwriter or any controlling person of any Underwriter, or the Company,
or any officer or director or controlling person of the Company, and shall
survive delivery of and payment for the Shares.

     11.  If this Agreement shall be terminated pursuant to Section 9 hereof,
the Company shall not then be under any liability to any Underwriter except as
provided in Section 6 and Section 8 hereof, but, if for any other reason any
Shares are not delivered by or on behalf of the Company as provided herein, the
Company will reimburse the Underwriters through SSB International for all out-
of-pocket expenses approved in writing by SSB International, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of the Shares not so delivered,
but the Company shall then be under no further liability to any Underwriter in
respect of the Shares not so delivered except as provided in Sections 6 and 8
hereof.

     12.  In all dealings hereunder, you shall act on behalf of each of the
Underwriters, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Underwriter made or
given by you jointly or by SSB International on your behalf.

     All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to the Underwriters in care of the SSB International
General Counsel, (fax no.: 011 44 171 2828) and confirmed to the General
Counsel, care of Smith Barney Inc., at  Victoria Plaza, 111 Buckingham Palace
Road, London SW1W 0SB England, Attention:  General Counsel; and if to the
Company, shall be delivered or sent by registered mail, telex or facsimile
transmission to the address of the Company set forth in the Registration
Statement, Attention: General Counsel; provided, however, that any notice to an
Underwriter pursuant to Section 8(c) hereof shall be delivered or sent by mail,
telex or facsimile transmission to such Underwriter at its 

                                       7
<PAGE>
 
address set forth in its Underwriters' Questionnaire, or telex constituting such
Questionnaire, which address will be supplied to the Company by SSB
International upon request. Any such statements, requests, notices or agreements
shall take effect upon receipt thereof.

     13.  This Agreement shall be binding upon, and inure solely to the benefit
of, the Underwriters, the Company and, to the extent provided in Sections 8 and
10 hereof, the officers and directors of the Company and each person who
controls the Company or any Underwriter, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement. No purchaser of any of the
Shares from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

     14.  Time shall be of the essence of this Agreement.

     15.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK, UNITED STATES OF AMERICA.

     16.  This Agreement may be executed by any one or more of the parties
hereto in any number of counterparts, each of which shall be deemed to be an
original, but all such counterparts shall together constitute one and the same
instrument.

                                       8
<PAGE>
 
     If the foregoing is in accordance with your understanding, please sign and
return to us seven counterparts hereof, and upon the acceptance hereof by you,
on behalf of each of the Underwriters, this letter and such acceptance hereof
shall constitute a binding agreement among each of the Underwriters and the
Company.  It is understood that your acceptance of this letter on behalf of each
of the Underwriters is pursuant to the authority set forth in a form of
Agreement among Underwriters (International Version), the form of which shall be
furnished to the Company for examination upon request, but without warranty on
your part as to the authority of the signers thereof.

                                    Very truly yours,

                                    Thermo Electron Corporation

                                    By: /s/ Gary S. Weinstein
                                       ---------------------------
                                      Name:  Gary S. Weinstein
                                      Title: Vice President


Accepted as of the date hereof:

Smith Barney Inc.
Goldman Sachs International
Lehman Brothers International (Europe)
HSBC Securities, Inc.

By: Smith Barney Inc.

By: /s/ Alexander Chefetz
   ---------------------------
        Director

On behalf of each of the Underwriters

                                       9
<PAGE>
 
                                           SCHEDULE I
<TABLE>
<CAPTION>

                                                                                   Number of Optional
                                                                                      Shares to be
                                                             Total Number of          Purchased if
                                                               Firm Shares           Maximum Option
                      Underwriter                            to be Purchased            Exercised
                      -----------                            ---------------         --------------
<S>                                                          <C>                     <C>
Smith Barney Inc........................................            342,000                51,300
Goldman Sachs International.............................            341,000                51,150
Lehman Brothers International (Europe)..................            341,000                51,150
HSBC Securities, Inc....................................            146,000                21,900
Cazenove & Co...........................................             65,000                 9,750
Lazard Capital Markets..................................             65,000                 9,750


                                                                  ---------               -------
          Total.........................................          1,300,000               195,000
                                                                  =========               =======
</TABLE>

                                       10


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