THERMO ELECTRON CORP
SC 13D/A, 1997-06-13
MEASURING & CONTROLLING DEVICES, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 1)

                            ThermoSpectra Corporation
                   -------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
          ------------------------------------------------------------
                         (Title of Class of Securities)

                                   883660-10-2
                               ------------------
                                 (CUSIP Number)

               Seth H. Hoogasian, Esq.          Thermo Electron Corporation
               General Counsel                  81 Wyman Street
               (617) 622-1000                   Waltham, MA  02254-9046
            ---------------------------------------------------------------

            (Name, Address and Telephone Number of Person Authorized 
                     to Receive Notices and Communications)

                                 January 7, 1997
            --------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

   If the filing person has previously filed a statement on Schedule 13G to
   report the acquisition which is the subject of this Schedule 13D, and is
   filing this schedule because of Rule 13d-1(b)(3) or (4), check the
   following box [  ].

   * The remainder of this cover page shall be filled out for a reporting
   person's initial filing on this form with respect to the subject class of
   securities, and for any subsequent amendment containing information which
   would alter the disclosures provided in a prior cover page.

   The information required in the remainder of this cover page shall not be
   deemed to be "filed" for the purpose of Section 18 of the Securities
   Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
   that section of the Act but shall be subject to all other provisions of the
   Act (however, see the Notes).
PAGE
<PAGE>





         1      NAME OF REPORTING PERSON
                S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                Thermo Instrument Systems Inc.
                IRS No. 04-2925809


         2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a) [   ]
                                                                 (b) [ x  ]

         3      SEC USE ONLY



         4      SOURCE OF FUNDS*

                WC

         5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                PURSUANT TO ITEMS 2(d) or 2(e)        [    ] 


         6      CITIZENSHIP OR PLACE OF ORGANIZATION

                State of Delaware
                 7  SOLE VOTING POWER
    NUMBER OF 
                    8,998,836
      SHARES
          
   BENEFICIALLY  8  SHARED VOTING POWER
          
     OWNED BY       0
                 9  SOLE DISPOSITIVE POWER
        EACH
                    8,998,836
     REPORTING
                 10 SHARED VOTING POWER
    PERSON WITH     0
PAGE
<PAGE>





        11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                8,998,836


        12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                CERTAIN SHARES*                                       [   ]


        13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                72.3%
        14      TYPE OF REPORTING PERSON *

                CO
PAGE
<PAGE>





                NAME OF REPORTING PERSON
         1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Thermo Electron Corporation
                IRS No. 04-2209186


         2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a) [   ]
                                                                 (b) [ x  ]

         3      SEC USE ONLY



         4      SOURCE OF FUNDS*

                WC

         5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                PURSUANT TO ITEMS 2(d) or 2(e)        [    ] 


         6      CITIZENSHIP OR PLACE OF ORGANIZATION

                State of Delaware
                 7  SOLE VOTING POWER
    NUMBER OF 
                    606,353
      SHARES
          
   BENEFICIALLY  8  SHARED VOTING POWER
          
     OWNED BY       0
                 9  SOLE DISPOSITIVE POWER
        EACH
                    606,353
     REPORTING
                 10 SHARED VOTING POWER
    PERSON WITH     0
PAGE
<PAGE>





        11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                606,353


        12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                CERTAIN SHARES*                                       [   ]


        13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                4.9%
        14      TYPE OF REPORTING PERSON *

                CO
PAGE
<PAGE>






        Pursuant to Rule 13d-2(c) under the Securities Exchange Act of 1934,
   this Amendment No. 1 to Schedule 13D amends and restates the entire text of
   the Schedule 13D previously filed by Thermo Instrument Systems Inc.
   relating to shares of common stock, par value $.01 per share, of
   ThermoSpectra Corporation.

   Item 1.  Security and Issuer.

        This Amendment relates to the shares (the "Shares") of common stock,
   par value $.01 per share, of ThermoSpectra Corporation (the "Issuer").  The
   Issuer's principal executive offices are located at 81 Wyman Street,
   Waltham, Massachusetts 02254-9046.

   Item 2.  Identity and Background.

        This Amendment is being filed by Thermo Electron Corporation ("Thermo
   Electron") and its subsidiary Thermo Instrument Systems Inc. ("Thermo
   Instrument" and, together with Thermo Electron, the "Reporting Persons").
   The Reporting Persons are filing this Amendment pursuant to Rule 13d-2 to
   reflect an increase in the Reporting Persons' holdings of the Issuer's
   Shares since the Reporting Persons' last filing on Schedule 13D, in
   February 1996, of more than one percent.

        Thermo Electron develops, manufactures and markets environmental,
   analytical and process control instruments, cogeneration and
   alternative-energy power plants, low-emission combustion systems, paper and
   waste-recycling equipment, and biomedical products.  Thermo Electron also
   provides a range of services including environmental remediation and
   consulting, laboratory analysis, and metals fabrication and processing, as
   well as research and product development in unconventional imaging,
   adaptive optics, and direct energy conversion.

        Thermo Instrument develops, manufactures and markets instruments used
   to detect and measure air pollution, radioactivity, complex chemical
   compounds, toxic metals, and other elements in a broad range of liquids and
   solids as well as to control and monitor various industrial processes.

        The principal business address and principal office address of Thermo
   Electron is 81 Wyman Street, Waltham, Massachusetts 02254-9046.  The
   principal business address and principal office address of Thermo
   Instrument is 1275 Hammerwood Avenue, Sunnyvale, California 94089.  The
   Reporting Persons are both Delaware corporations.

        Appendix A attached to this Schedule 13D sets forth with respect to
   each executive officer and director of the Reporting Persons his or her (a)
   name; (b) residence or business address; (c) present principal occupation
   or employment and the name, principal business and address of any
   corporation or other organization in which such employment is conducted;
   and (d) citizenship.  To the knowledge of the Reporting Persons, there is
   no person who may be deemed to be a controlling person of the Reporting
   Persons (except that Thermo Electron may be deemed to control Thermo
   Instrument by virtue of its majority ownership).
PAGE
<PAGE>





        During the last five years, neither the Reporting Persons nor (to the
   knowledge of the Reporting Persons) any executive officer or director of
   the Reporting Persons has been convicted in a criminal proceeding
   (excluding traffic violations and similar misdemeanors).

        During the last five years, neither the Reporting Persons nor (to the
   knowledge of the Reporting Persons) any executive officer or director of
   the Reporting Persons has been a party to a civil proceeding of a judicial
   or administrative body of competent jurisdiction which resulted in a
   judgment, decree or final order (i) enjoining future violations of, or
   prohibiting or mandating activities subject to, federal or state securities
   laws or (ii) finding a violation with respect to such laws.

   Item 3.  Source and Amount of Funds or Other Consideration.

        The Reporting Persons have expended approximately $8,460,100 in
   purchasing securities of the Issuer since the date of their last filing on
   Schedule 13D.  These funds were paid out of the Reporting Persons' working
   capital.

   Item 4.  Purpose of Transaction

        Thermo Instrument may make purchases of Shares or other securities of
   the Issuer in such manner and in such amounts as it determines to be
   appropriate in order to maintain at least 50% ownership of the Issuer.  The
   Reporting Persons may also make additional purchases of Shares or other
   securities of the Issuer in such manner and in such amounts as they
   determine to be appropriate for other purposes.  In determining whether to
   do so for other purposes, the Reporting Persons will consider various
   relevant factors, including their evaluation of the Issuer's business,
   prospects and financial condition, amounts and prices of available
   securities of the Issuer, the market for the Issuer's securities, other
   opportunities available to the Reporting Persons and general market and
   economic conditions.  Purchases may be made either on the open market or
   directly from the Issuer.

        Except as set forth in this Item 4 and in Item 6, neither of the
   Reporting Persons nor, to the Reporting Persons' knowledge, any of the
   executive officers or directors of the Reporting Persons has any current
   plans or proposals which relate to or would result in any of the actions
   specified in clauses (a) through (j) of Item 4 of Schedule 13D, although
   the Reporting Persons and such other persons do not rule out the
   possibility of effecting or seeking to effect any such actions in the
   future.

   Item 5.  Interest in Securities of the Issuer.

        (a)  The Shares beneficially owned by the Reporting Persons include
   8,998,836 Shares, or approximately 72.3% of the outstanding Shares, owned
   by Thermo Instrument, and 606,353 Shares, or approximately 4.9% of the
   outstanding Shares, owned by Thermo Electron.  To the knowledge of the
   Reporting Persons, the executive officers and directors of the Reporting
   Persons beneficially own an aggregate of 357,328 Shares or approximately
   2.8% of the outstanding Shares.  To the knowledge of the Reporting Persons,
PAGE
<PAGE>





   the Shares beneficially owned by all executive officers and directors of
   the Reporting Persons include 174,500 Shares that such persons have the
   right to acquire within 60 days through the exercise of stock options.
   Ownership information for each executive officer and director of the
   Reporting Persons who owns Shares is set forth below.


   Name                              Number of Shares(1)
   ----                              -------------------


   John M. Albertine                 1,000

   Frank Borman                      1,500

   Richard W.K. Chapman              4,000

   Peter O. Crisp                    161,000

   Elias P. Gyftopoulos              20,000

   George N. Hatsopoulos             20,000

   John N. Hatsopoulos               20,000

   Denis A. Helm                     4,000

   Barry S. Howe                     4,010

   Frank Jungers                     5,500

   Paul F. Kelleher                  5,000

   Earl R. Lewis                     55,000

   Robert A. McCabe                  8,318

   Frank E. Morris                   5,000

   Donald E. Noble                   4,000

   Hutham S. Olayan                  1,000

   Peter G. Pantazelos               4,500

   William A. Rainville              10,000

   Arvin H. Smith                    20,000

   Polyvios C. Vintiadis             1,500

   Roger D. Wellington               1,000

   John W. Wood, Jr.                 5,000

   All directors and                 357,328
   current executive
   officers as a group (22
   persons)

   ___________________

   (1)  Shares reported as beneficially owned by Dr. Albertine, Col. Borman,
   Dr. Chapman, Mr. Crisp, Dr. Gyftopoulos, Dr. G. Hatsopoulos, Mr. J.
   Hatsopoulos, Mr. Helm, Mr. Howe, Mr. Jungers, Mr. Kelleher, Mr. Lewis, Mr.
   McCabe, Dr. Morris, Mr. Noble, Ms. Olayan, Mr. Pantazelos, Mr. Rainville,
   Mr. Smith, Mr. Vintiadis, Mr. Wellington, Mr. Wood and all directors and
   executive officers as a group include 1,000, 1,500, 4,000, 1,000, 20,000,
PAGE
<PAGE>





   20,000, 20,000, 4,000, 4,000, 1,500, 5,000, 50,000, 1,500, 1,000, 1,000,
   1,000, 2,500, 10,000, 20,000, 1,500, 1,000, 3,000 and 174,500 Shares,
   respectively, that such person or members of the group have the right to
   acquire within 60 days.

     While certain directors and executive officers of the Reporting Persons
   are also directors or executive officers of the Issuer, all such persons
   disclaim beneficial ownership of the Shares owned by the Reporting Persons.

        (b)  The Reporting Persons and the executive officers and directors of
   the Reporting Persons have the sole power to vote and dispose of the Shares
   each such person owns except as follows:  Shares beneficially owned by Mr.
   Crisp include 160,000 Shares held in the aggregate by entities affiliated
   with Venrock Associates.  Mr. Crisp is both a general and limited partner
   of Venrock Associates and, therefore, may be deemed to beneficially own the
   Shares held by such entities.  Mr. Crisp disclaims beneficial ownership of
   such Shares, except to the extent of his pecuniary interest therein arising
   from his general and limited partnership interests in Venrock Associates.
   Thermo Electron presently owns more than 50% of the outstanding common
   stock of Thermo Instrument and, therefore, may be deemed to have the power
   to vote and dispose of the Shares owned by Thermo Instrument.  However,
   Thermo Electron and Thermo Instrument disclaim the existence of a group
   between the two entities for purposes of this Schedule 13D.

        (c)  Thermo Electron has effected the following transactions with
   respect to the Shares during the past 60 days:

       Date      Amount    Price Per Share       Transfer Type


   4/3/97           1,500      $13.13      Purchase on Open Market

   4/4/97           6,500      $12.88      Purchase on Open Market

   4/17/97          6,200      $11.63      Purchase on Open Market

   4/18/97          1,000      $11.88      Purchase on Open Market

   4/21/97         16,000      $12.00      Purchase on Open Market

   4/22/97          1,100      $12.00      Purchase on Open Market

   4/24/97          1,100      $11.88      Purchase on Open Market

   4/25/97          1,100      $11.75      Purchase on Open Market

   4/25/97          5,000      $11.88      Purchase on Open Market

   4/28/97          1,200      $12.00      Purchase on Open Market

   5/2/97           1,600      $12.13      Purchase on Open Market

   5/5/97             500      $13.13      Purchase on Open Market

   5/5/97           1,100      $13.25      Purchase on Open Market

   5/8/97           8,600      $13.13      Purchase on Open Market

   5/9/97          11,600      $13.13      Purchase on Open Market

   5/12/97         15,100      $13.13      Purchase on Open Market

   5/13/97         11,100      $13.00      Purchase on Open Market
PAGE
<PAGE>





   5/14/97         66,200      $12.88      Purchase on Open Market

   5/16/97            200      $13.00      Purchase on Open Market

   5/16/97            900      $13.25      Purchase on Open Market

   5/19/97          1,200      $13.25      Purchase on Open Market

   5/20/97          5,000      $13.25      Purchase on Open Market

   5/21/97          1,200      $13.38      Purchase on Open Market

   To the knowledge of the Reporting Persons, no executive officer or director
   of the Reporting Persons has effected any transactions in Shares of the
   Issuer in the past 60 days.

        (d)  Not applicable.

        (e)  Not applicable.

   Item 6.  Contracts, Arrangements, Understandings or Relationships with
   respect to Securities of the Issuer.

        Of the 8,998,836 Shares beneficially owned by Thermo Instrument,
   108,610 Shares are subject to options to acquire such Shares granted by
   Thermo Instrument pursuant to its director and employee stock option plans.
   Of the 577,153 Shares beneficially owned by Thermo Electron, 19,250 Shares
   are subject to options to acquire such Shares granted by Thermo Electron
   pursuant to its director and employee stock option plans.  The executive
   officers and directors of the Reporting Persons have the right, pursuant to
   such options, to acquire 29,500 Shares.  In addition, the following
   officers and directors of the Reporting Persons have the right to acquire
   shares from the Issuer pursuant to the Issuer's director and employee stock
   option plans:  Dr. George N. Hatsopoulos has the right to acquire 20,000
   Shares within 60 days; Mr. John N. Hatsopoulos has the right to acquire
   20,000 Shares within 60 days; Mr. Earl R. Lewis has the right to acquire
   50,000 Shares within 60 days; Mr. Arvin H. Smith has the right to acquire
   20,000 Shares within 60 days; Dr. Elias P. Gyftopoulos has the right to
   acquire 20,000 Shares within 60 days; Mr. William A. Rainville has the
   right to acquire 10,000 Shares within 60 days; and Mr. Paul F. Kelleher has
   the right to acquire 5,000 Shares within 60 days.

        During 1996, the Human Resources Committee of the Board of Directors
   of the Issuer (the "Committee") established a stock holding policy for
   executive officers of the Issuer.  The stock holding policy specifies an
   appropriate level of ownership of the Issuer's Common Stock as a multiple
   of the officer's compensation.  For the chief executive officer, the
   multiple is one times his base salary and reference bonus for the calendar
   year.  For all other officers, the multiple is one times the officer's base
   salary.

        In order to assist officers in complying with the policy, the
   Committee also adopted a stock holding assistance plan under which the
   Issuer is authorized to make interest-free loans to officers to enable them
   to purchase shares of the Common Stock in the open market.  The loans are
PAGE
<PAGE>





   required to be repaid upon the earlier of demand or the fifth anniversary
   of the date of the loan, unless otherwise authorized by the Committee. 

        The Committee also adopted a policy requiring its executive officers
   to hold shares of the Issuer's Common Stock acquired upon the exercise of
   stock options granted by the Issuer.  Under this policy, executive officers
   are required to hold one-half of their net option exercises over a period
   of five years.  The net option exercise is determined by calculating the
   number of shares acquired upon exercise of a stock option, after deducting
   the number of shares that could have been traded to exercise the option and
   the number of shares that could have been surrendered to satisfy tax
   withholding obligations attributable to the exercise of the options.

        During 1996, the Committee also established a stock holding policy for
   directors, including persons who are also directors or executive officers
   of the Reporting Persons (Elias P. Gyftopoulos, Earl R. Lewis and Arvin H.
   Smith).  The stock holding policy requires each director to hold a minimum
   of 1,000 shares of Common Stock.  

        In addition, the Committee adopted a policy requiring directors to
   hold shares of the Issuer's Common Stock equal to one-half of their net
   option exercises over a period of five years.  The net option exercise is
   determined by calculating the number of shares acquired upon exercise of a
   stock option, after deducting the number of shares that could have been
   traded to exercise the option and the number of shares that could have been
   surrendered to satisfy tax withholding obligations attributable to the
   exercise of the option.

   Item 7.   Material to Be Filed as Exhibits

        The following documents relating to the securities of the Issuer are
   incorporated herein by reference.

        (i)       Equity Incentive Plan of the Issuer (filed as Exhibit 10.18
   to the Registrant's Registration Statement on Form S-1 [Reg. No. 33-93778]
   and incorporated herein by reference).

        (ii)      Directors' Stock Option Plan of the Issuer (filed as Exhibit
   10.20 to the Issuer's Registration Statement on Form S-1 [File No.
   33-93778] and incorporated herein by reference).

        (iii)     Amended and Restated Directors' Stock Option Plan of Thermo
   Electron (filed as Exhibit 10.25 to Thermo Electron's Annual Report on Form
   10-K for the fiscal year ended December 31, 1994 [File No. 1-8002] and
   incorporated herein by reference).

        (iv)      Thermo Electron Corporation-ThermoSpectra Corporation
   Nonqualified Stock Option Plan (filed as Exhibit 10.34 to Thermo Power
   Corporation's Annual Report on Form 10-K for the fiscal year ended
   September 30, 1995 [File No. 1-10573] and incorporated herein by
   reference).
PAGE
<PAGE>





        (v)       Directors' Stock Option Plan of Thermo Instrument (filed as
   Exhibit 10(c) to Thermo Instruments' Registration Statement on Form S-1
   [Reg. No. 33-6762] and incorporated herein by reference).

        (vi)      Thermo Instrument Systems Inc. - ThermoSpectra Corporation
   Nonqualified Stock Option Plan (filed as Exhibit 10.51 to Thermo
   Instruments' Annual Report on Form 10-K for the fiscal year ended December
   31, 1994 [File No. 1-9786] and incorporated herein by reference).

        (vii)     Restated Stock Holding Assistance Plan and Form of
   Promissory Note (filed as Exhibit 10.17 to the Annual Report on Form 10-K
   of the Issuer for the fiscal year ended December 28, 1996 [File No.
   1-13876] and incorporated herein by reference).
PAGE
<PAGE>






   Signatures

        After reasonable inquiry and to the best of their knowledge and
   belief, the Reporting Persons certify that the information set forth in
   this statement is true, complete and correct.

   Date: June 13, 1997                THERMO ELECTRON CORPORATION


                                      By:  /s/ Sandra L. Lambert
                                           ---------------------------
                                           Sandra L. Lambert
                                           Secretary

   Date: June 13, 1997                THERMO INSTRUMENT SYSTEMS INC.


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





   Signatures

        After reasonable inquiry and to the best of their knowledge and
   belief, the Reporting Persons certify that the information set forth in
   this statement is true, complete and correct.

   Date: June 13, 1997                THERMO ELECTRON CORPORATION


                                      By:  /s/ Sandra L. Lambert
                                           -----------------------
                                           Sandra L. Lambert
                                           Secretary

   Date: June 13, 1997                THERMO INSTRUMENT SYSTEMS INC.


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





                                   APPENDIX A
                                   ----------

        The following individuals are executive officers or directors of
   Thermo Electron Corporation ("Thermo Electron") and/or its subsidiary
   Thermo Instrument Systems Inc. ("TISI").  Unless otherwise noted, all such
   individuals are citizens of the United States.  Unless otherwise noted, the
   business address of each executive officer of Thermo Electron Corporation
   is Thermo Electron Corporation, 81 Wyman Street, Waltham, Massachusetts
   02254-9046 and the business address of each executive officer of TISI is
   Thermo Instrument Systems Inc., 1275 Hammerwood Avenue, Sunnyvale,
   California 94089.


   Frank Borman:                                Director, TISI
   -------------

        Mr. Borman is President and Chief Executive Officer of Patlex
   Corporation, a patent licensing corporation.  His business address is 250
   Cotorro Court, Suite 4, Las Cruces, New Mexico 88005.


   John M. Albertine:                           Director, Thermo Electron
   ------------------

        Dr. Albertine is Chairman of the Board and Chief Executive Officer of
   Albertine Enterprises, Inc., an economic and public policy consulting firm.
   His business address is Albertine Enterprises, Inc., 1156 15th Street N.W.,
   Suite 505, Washington, DC  20005.

   Peter O. Crisp:                              Director, Thermo Electron
   ---------------

        Mr. Crisp is a General Partner of Venrock Associates, a venture
   capital investment firm.  His business address is 30 Rockefeller Plaza, New
   York, New York  10112.

   Elias P. Gyftopoulos:                        Director, Thermo Electron
   ---------------------

        Dr. Gyftopoulos is Professor Emeritus of the Massachusetts Institute
   of Technology.  His business address is Massachusetts Institute of
   Technology, Room 24-109, 77 Massachusetts Avenue, Cambridge, Massachusetts
   02139.

   Frank Jungers:                               Director, Thermo Electron
   -------------

        Mr. Jungers is a consultant on business and energy matters.  His
   business address is 822 N.W. Murray, Suite 242, Portland, Oregon 97229.

   Robert A. McCabe:                            Director, Thermo Electron
   -----------------

        Mr. McCabe is President of Pilot Capital Corporation, a firm
   specializing in private investments and acquisition services.  His business
   address is Pilot Capital Corporation, 444 Madison Avenue, Suite 2103, New
   York, New York 10022.

   Frank E. Morris:                             Director, Thermo Electron
   ----------------
PAGE
<PAGE>





         Dr. Morris served as President of the Federal Reserve Bank of Boston
   from 1968 until he retired in 1988. Dr. Morris also served as the Peter
   Drucker Professor of Management at Boston College from 1989 to 1994.  His
   residential address is P.O. Box 825, 24 Sugarhouse Road, New London, New
   Hampshire 03257.

   Donald E. Noble:                             Director, Thermo Electron
   ----------------

        For more than 20 years, from 1959 to 1980, Mr. Noble served as the
   Chief Executive Officer of Rubbermaid, Incorporated, first with the title
   of President and then as Chairman of the Board.  His business address is
   Rubbermaid Incorporated, 1147 Akron Road, Wooster, Ohio 44691.

   Hutham S. Olayan:                            Director, Thermo Electron
   -----------------

        Ms. Olayan is the President and a director of Olayan America
   Corporation and President of Competrol Real Estate Limited, firms engaged
   in advisory services and private real estate investments.  Her  business
   address is Suite 1100, 505 Park Avenue, New York, New York  10022.  Ms.
   Olayan is a citizen of Saudi Arabia.

   Roger D. Wellington:                         Director, Thermo Electron
   --------------------

        Mr. Wellington is a business consultant.  His address is P.O. Box
   8186, Longboat Key, Florida 34228.

   Polyvios C. Vintiadis:                       Director, TISI
   ---------------------

        Mr. Vintiadis is the Chairman and Chief Executive Officer of Towermarc
   Corporation, a real estate development company.  His business address is
   Towermarc, 2 Pickwick Plaza, 4th Floor, Greenwich, CT 06830.

   George N. Hatsopoulos:                  Director, Chairman of the
   ---------------------
                                           Board and Chief Executive
                                           Officer, Thermo Electron

   John N. Hatsopoulos:                    President and Chief Financial
   -------------------
                                           Officer, Thermo Electron
                                           Director, Vice President
                                           and Chief Financial Officer
                                           TISI

   Arvin H. Smith:                         Director and Chief Executive
   --------------
                                           Officer, TISI
                                           Executive Vice President
                                           Thermo Electron

   Denis A. Helm:                          Senior Vice President, TISI
   -------------

   Earl R. Lewis:                          President and Chief Operating
   -------------
                                           Officer, TISI

   Richard W.K. Chapman:                   Vice President, TISI
   --------------------
PAGE
<PAGE>





   Barry S. Howe:                          Vice President, TISI
   -------------

   Paul F. Kelleher:                       Senior Vice President, Finance
   ----------------
                                           and Administration
                                           and Chief Accounting
                                           Officer, Thermo Electron
                                           Chief Accounting Officer,
                                           TISI

   Peter G. Pantazelos:                    Executive Vice President,
   -------------------
                                           Corporate Development,
                                           Thermo Electron

   William A. Rainville:                   Senior Vice President,
   --------------------
                                           Thermo Electron

   John W. Wood, Jr.:                      Senior Vice President,
   -----------------
                                           Thermo Electron








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