THERMO ELECTRON CORP
SC 13D/A, 1996-02-14
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. 3)

                             Thermo Cardiosystems Inc.
                       ----------------------------------
                                (Name of Issuer)

                     Common Stock, par value $.10 per share
          ------------------------------------------------------------
                         (Title of Class of Securities)

                                    88355K101
                                ----------------
                                 (CUSIP Number)

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

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

                                 January 22, 1996
             -------------------------------------------------------
             (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 [  ].

   Check the following box if a fee is being paid with the statement [  ].  (A
   fee is not required only if the reporting person:  (1) has a previous
   statement on file reporting beneficial ownership of more than five percent
   of the class of securities described in Item 1; and (2) has filed no
   amendment subsequent thereto reporting beneficial ownership of five percent
   or less of such class.)  (See Rule 13d-7).

   * 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>


        CUSIP No.  88355K101           13D             Page 2 of 16 Pages


                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*

                N/A

         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 
                    130,002
      SHARES
                 8  SHARED VOTING POWER
   BENEFICIALLY
                    0
     OWNED BY    9  SOLE DISPOSITIVE POWER

        EACH        130,002
                 10 SHARED DISPOSITIVE POWER
     REPORTING
                    0
    PERSON WITH
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 3 of 16 Pages


        11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                130,002


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


        13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                0.5%

        14      TYPE OF REPORTING PERSON *

                CO
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 4 of 16 Pages


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

                Thermedics Inc.
                IRS No. 04-2788806


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

         3      SEC USE ONLY



         4      SOURCE OF FUNDS*

                00

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


         6      CITIZENSHIP OR PLACE OF ORGANIZATION

                Commonwealth of Massachusetts
                 7  SOLE VOTING POWER
    NUMBER OF 
                    13,155,075
      SHARES
                 8  SHARED VOTING POWER
   BENEFICIALLY
                    0
     OWNED BY    9  SOLE DISPOSITIVE POWER

        EACH        13,155,075
                 10 SHARED DISPOSITIVE POWER
     REPORTING
                    0
    PERSON WITH
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 5 of 16 Pages


        11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                13,155,075


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


        13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                54.4%

        14      TYPE OF REPORTING PERSON *

                CO
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 6 of 16 Pages


   Item 1.  Security and Issuer.

        This Amendment relates to the shares (the "Shares") of common stock,
   par value $0.10 per share, of Thermo Cardiosystems Inc. (the "Issuer").
   The Issuer's principal executive offices are located at 470 Wildwood
   Street, Woburn, Massachusetts 01888.

   Item 2.  Identity and Background.

        This Amendment is being filed by Thermo Electron Corporation ("Thermo
   Electron") and its subsidiary Thermedics Inc. ("Thermedics" and, together
   with Thermo Electron, the "Reporting Persons").  The Reporting Persons have
   previously reported information relating to the Shares annually on
   amendments to the Reporting Persons' original Schedule 13G.  Beginning with
   this Amendment, the Reporting Persons are reporting their ownership
   information with respect to the Issuer on Schedule 13D.

        The principal business address and principal office address of Thermo
   Electron, a Delaware corporation, is 81 Wyman Street, Waltham,
   Massachusetts 02254 and the principal business address and principal office
   address of Thermedics, a Massachusetts corporation, is 470 Wildwood Street,
   Woburn, Massachusetts 01888.

        Thermo Electron is a manufacturer of environmental monitoring and
   analysis instruments, biomedical products including heart-assist devices
   and mammography systems, papermaking and recycling equipment, alternative-
   energy systems, and other specialized products. Thermo Electron also
   provides environmental and metallurgical services and conducts advanced
   technology research and development. 

        Thermedics develops, manufactures, and markets product quality
   assurance systems, precision weighing and inspection equipment,
   electrochemistry and microweighing products, electronic test instruments,
   and explosives-detection devices, as well as implantable heart-assist
   devices and other biomedical products. 

        Appendix A attached to this Amendment 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
   Thermedics by virtue of its majority ownership).

        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 have 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
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 7 of 16 Pages


   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.

        On January 22, 1996, Thermo Electron's wholly owned subsidiary TMO TCA
   Investments Inc. merged with and into Thermedics, through which merger
   Thermo Electron exchanged 315,199 shares of the common stock of Thermo
   Voltek Corp. and 529,965 Shares of the Issuer for 1,688,161 shares of the
   common stock of Thermedics.  The number of shares of Thermedics' common
   stock was determined by (a) taking the sum of (i) the product of 315,199
   times $17.125, the five day average closing price of Thermo Voltek Corp.'s
   common stock from January 15, 1996 to January 19, 1996 and (ii) the product
   of 529,965 times $65.150, the five day average closing price of the Shares
   from January 15, 1996 to January 19, 1996, and (b) dividing the result by
   $23.650, the five day average closing price of Thermedics' common stock
   from January 15, 1996 to January 19, 1996.

   Item 4.  Purpose of Transaction

        The purpose of this transaction was to ensure that Thermedics'
   ownership of Thermo Voltek Corp.'s capital stock and the Issuer's capital
   stock remained greater than 50% of the total outstanding shares of capital
   stock of each of the two subsidiaries.

        Thermedics may make additional 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 or
   for other purposes.  The Reporting Persons may also make additional
   purchases of Shares or other securities of the Issuer in such manner and in
   such amounts as it determines to be appropriate for other purposes.  In
   determining whether to do so for other purposes, they 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, 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 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
   13,155,075 Shares, or approximately 54.4% of the outstanding Shares, owned
   by Thermedics, and 130,002 Shares, or approximately 0.5% of the outstanding
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 8 of 16 Pages


   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 442,832 Shares or approximately 1.8% of
   the outstanding Shares.  To the knowledge of the Reporting Persons, the
   Shares beneficially owned by all executive officers and directors of the
   Reporting Persons include 373,081 Shares that such persons have the right
   to acquire within 60 days through the exercise of stock options.

        (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.  As of January 22, 1996, Thermo Electron owned more
   than 50% of the outstanding common stock of Thermedics and, therefore, may
   be deemed to have the power to vote and dispose of the Shares owned by
   Thermedics.  However, Thermo Electron disclaims the existence of a group
   between itself and Thermedics for purposes of this Schedule 13D.

        (c)  During the past 60 days, the Reporting Persons effected only the
   transaction described in Item 3 with respect to the Shares.  To the
   knowledge of the Reporting Persons, the following are the only transactions
   in the Shares effected by an executive officer or director of the Reporting
   Person in the past 60 days:

   Name                     Date      Amount    Price     Transfer Type
   ----                     ----      ------    -----     -------------

   John N. Hatsopoulos      1/2/96    1,000     $74.50    Sale on open market

   Paul F. Kelleher         1/3/96      500     $74.12    Sale on open market

   Paul F. Kelleher         1/3/96    5,000     $73.00    Sale on open market

        (d)  Not applicable.

        (e)  Not applicable.

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

        The merger described in Item 3 was effected pursuant to an Agreement
   and Plan of Merger dated January 22, 1996 by and between TMO TCA
   Investments Inc. and Thermedics (the "Agreement").

   Item 7.   Material to Be Filed as Exhibits

        The Agreement is attached hereto as Exhibit A.
PAGE
<PAGE>


        CUSIP No.  88355K101           13D             Page 9 of 16 Pages


   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: February 13, 1996                 THERMO ELECTRON CORPORATION


                                      By:  /s/Jonathan W. Painter
                                           ----------------------------
                                           Jonathan W. Painter
                                           Treasurer

   Date: February 13, 1996                 THERMEDICS INC.

                                      By:  /s/Jonathan W. Painter
                                           ----------------------------
                                           Jonathan W. Painter
                                           Treasurer
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 10 of 16 Pages


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

        The following individuals are executive officers or directors of
   Thermo Electron Corporation ("Thermo Electron") and/or its subsidiary
   Thermedics Inc. ("Thermedics").  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 is Thermo
   Electron Corporation, 81 Wyman Street, Waltham, Massachusetts 02254 and the
   business address of each executive officer of Thermedics is Thermedics
   Inc., 470 Wildwood Street, Woburn, Massachusetts 01888.

   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
   ---------------
                                                Director, Thermedics

        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 the Ford Professor of Engineering at 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 5584 S.E. Hillwood Circle, Milwaukie, Oregon   97267.

   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
   ----------------

        Dr. Morris served as the Peter Drucker Professor of Management at
   Boston College from 1989 to 1994.  Dr. Morris also served as President of
   the Federal Reserve Bank of Boston from 1968 until he retired in 1988.  His
   residential address is 105 Walpole Street, Dover, Massachusetts  02030.
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 11 of 16 Pages


   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 business address is 25
   Hillside Road, Cumberland, Rhode Island  02864.

   Paul F. Ferrari:                             Director, Thermedics
   ----------------

        Mr. Ferrari has been a consultant to Thermo Electron since January
   1991.  Mr. Ferrari was a Vice President of Thermo Electron from 1988 until
   his retirement at the end of 1990, its Secretary from 1981 to 1990 and its
   Treasurer from 1967 to 1988.  He served as Thermedics' Clerk from 1983 to
   1990 and its Treasurer from 1983 to 1988.  His business address is Thermo
   Electron Corporation, 81 Wyman Street, Waltham, Massachusetts 02254.

   Nicholas T. Zervas:                          Director, Thermedics
   -------------------

        Dr. Zervas has been Chief of Neurological Service at Massachusetts
   General Hospital since 1977.  His business address is Massachusetts General
   Hospital, Neurosurgery Department, Boston, Massachusetts 02114.

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

   John N. Hatsopoulos:                         Executive Vice President
   --------------------
                                                and Chief Financial Officer,
                                                Thermo Electron
                                                Director, Chairman of the
                                                Board, Vice President and
                                                Chief Financial Officer,
                                                Thermedics

   Robert C. Howard:                            Executive Vice President,
   -----------------
                                                Thermo Electron
                                                Director, Thermedics
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 12 of 16 Pages


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

   Arvin H. Smith:                              Executive Vice President,
   ---------------
                                                Thermo Electron
                                                Director, Thermedics

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

   John W. Wood, Jr.:                           Senior Vice President,
   ------------------
                                                Thermo Electron
                                                Director, President and Chief
                                                Executive Officer, Thermedics

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

   John T. Keiser:                              Senior Vice President,
   ---------------
                                                Thermedics

   Victor L. Poirier:                           Senior Vice President,
   ------------------
                                                Thermedics

   David H. Fine:                               Vice President, Thermedics
   --------------
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 13 of 16 Pages


                                                               Exhibit A
                                                               ---------

                          AGREEMENT AND PLAN OF MERGER
                          ----------------------------


        THIS AGREEMENT, dated as of the 22nd day of January, 1996, by and
   among Thermedics Inc., a Massachusetts corporation ("TMD") and TMO TCA
   Investments Inc., a Delaware corporation ("Investments").

        WHEREAS, the Articles of Organization of TMD were filed in the office
   of the Secretary of State of the Commonwealth of Massachusetts on June 2,
   1983, and TMD has authorized capital stock of 50,000,000 shares of common
   stock, $.10 par value per share;

        WHEREAS, the Certificate of Incorporation of Investments was filed in
   the office of the Secretary of State of the State of Delaware on October
   17, 1995, and Investments has authorized capital stock of 3,000 shares of
   common stock, $.01 par value per share, all of which shares are issued and
   outstanding;

        WHEREAS, the registered office of TMD in the Commonwealth of
   Massachusetts is located at 470 Wildwood Street, Woburn, Massachusetts
   01888-1799; and the registered office of Investments is located at 1209
   Orange Street, Wilmington, Delaware and the name of its registered agent is
   The Corporation Trust Company;

        WHEREAS, the Boards of Directors of TMD and Investments deem it
   advisable and in the best interest of such corporations and their
   respective shareholders that Investments be merged into and with TMD on the
   terms and conditions set forth in this Agreement; and

        WHEREAS , the Boards of Directors of TMD and Investments desire that
   the merger provided for herein be a tax-free reorganization pursuant to
   Section 368 of the Internal Revenue Code of 1986, as amended.

        NOW THEREFORE, for and in consideration of the mutual covenants and
   agreements hereinafter set forth, and other good and valuable
   consideration, the receipt of which is acknowledged by each party hereto,
   the parties hereto agree as follows:

        FIRST:  In accordance with this Agreement, on the Effective Date (as
   defined herein), Investments shall be merged into and with TMD (hereinafter
   sometimes called the Merger).  TMD shall be the surviving corporation and
   the separate existence of Investments shall cease as of the Merger.  

        SECOND:  The Articles of Organization and Bylaws of TMD, in effect
   immediately prior to the Merger, shall thereafter continue in full force
   and effect as the Articles of Organization and Bylaws of the surviving
   corporation.  The directors and officers of TMD as of the Effective Date
   shall be the directors and officers the surviving corporation, each to hold
   office in accordance with applicable law and the Articles of Organization
   and Bylaws of TMD.
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 14 of 16 Pages


        THIRD:  The manner of converting the outstanding shares of the capital
   stock of Investments into the capital stock of TMD shall be as follows:

             (a)  Conversion of Investments' Shares.  At the effective time of
                  ---------------------------------
   the Merger, the shares of Investments' common stock outstanding immediately
   prior thereto (herein referred to collectively as the "Investments Shares")
   shall, by virtue of the Merger and without any action on the part of the
   holder thereof, but subject to this Section, be canceled and converted into
   the right to receive such number of whole shares (rounded to the nearest
   whole share) of TMD common stock, $.10 par value (the "TMD Common Stock")
   as is equal to $39,925,003 divided by the average closing price of TMD
   Common Stock for the five days prior to the date hereof.  

             (b)  Payment for Investments Shares.  Promptly after the listing
                  ------------------------------
   of the shares of TMD Common Stock to be issued in connection with the
   Merger (the "TMD Shares") for trading upon the American Stock Exchange,
   Inc. ("AMEX") and upon the proper surrender by the shareholder of
   Investments (the "Shareholder") of such certificates representing
   Investments Shares held by it together with appropriate tax certifications,
   TMD shall cause its stock transfer agent to issue and deliver to the
   Shareholder a certificate for the TMD Shares that the Shareholder is
   entitled to receive.  It shall be a condition of such payment and delivery
   that the surrendered certificate(s) be properly endorsed or otherwise in
   proper form for transfer and that the Shareholder shall pay any transfer or
   other taxes required by reason of such payment or delivery or establish to
   the satisfaction of TMD that such tax has been paid or is not applicable.
   The date on which all of the conditions to the issuance of the certificate
   representing the TMD Shares shall have been met is referred to hereinafter
   as the "Payment Date."

             (c)  Adjustments.
                  -----------

                  (i) In the event TMD shall declare, pay, make or effect
   between the date of this Agreement and the Payment Date, (A) any stock
   dividend or other distribution in respect of the TMD Common Stock payable
   in shares of capital stock of TMD, (B) any stock split or other subdivision
   of outstanding shares of TMD Common Stock into a larger number of shares,
   (C) any combination of outstanding shares of TMD Common Stock into a
   smaller number of shares, (D) any reclassification of TMD Common Stock into
   other shares of capital stock or securities, or (E) any exchange of the
   outstanding shares of TMD Common Stock, in connection with a merger or
   consolidation of TMD or sale by TMD of all or part of its assets, for a
   different number of class of shares of stock or securities of TMD or for
   the share of the capital stock or other securities of any other
   corporation, appropriate adjustment shall be made in the number of TMD
   Shares to be issued in connection with the Merger as may be required to put
   the Shareholder in the same position as if the record date, with respect to
   any such transaction or transactions which shall so occur, had been
   immediately after the Payment Date, or otherwise to carry out the intents
   and purposes of this Agreement. 

                  (ii) In the event TMD shall declare, pay, make or effect
   between the date of this Agreement and the Payment Date any dividend or
   other distribution in respect of the TMD Common Stock payable in cash or
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 15 of 16 Pages


   other property other than in shares of capital stock of TMD (other than
   shares of the capital stock of TMD issuable pursuant to TMD's Automatic
   Dividend Reinvestment Plan ("Plan Shares")), then the TMD Shares to be
   issued in connection with the Merger shall be deemed to be outstanding as
   of the record date with respect to any such dividend or distribution, and
   the cash or other property (including Plan Shares) otherwise payable or
   distributable to the Shareholder with respect to such TMD Shares shall be
   held by TMD for the benefit of the Shareholder; and TMD shall take all
   actions reasonably necessary to prevent such cash or other property
   (including Plan Shares) from being or becoming subject to any lien,
   security interest or other encumbrance not for the benefit of the
   Shareholder.  Upon the issuance of the TMD Shares to the Shareholder
   pursuant to paragraph (b) above, such cash or other property (including
   Plan Shares and together with any earnings or interest thereon) shall
   likewise be distributed by TMD to the Shareholder.  
    
        FOURTH:  The terms and conditions of the Merger are as follows:

             (a)  The Merger shall become effective upon filing a Certificate
   of Merger with the Secretary of State of the State of Delaware, pursuant to
   Section 252 of the General Corporation Law of the State of Delaware and the
   Articles of Merger with the Secretary of State of the Commonwealth of
   Massachusetts, pursuant to Section 79 of the Massachusetts Business
   Corporation Law.  The term "Effective Date" shall mean the date and time of
   the filing of the Articles of Merger with the Secretary of State of the
   Commonwealth of Massachusetts.

             (b)  Promptly after the Effective Date, TMD shall take all action
   necessary to list the TMD Shares for trading upon AMEX in accordance with
   the AMEX's Listing Standards, Policies and Requirements.

             (c)  The effect of the Merger shall be as provided by the
   applicable provision of the Massachusetts Business Corporation Law.

             (d)  TMD hereby (i) agrees that it may be served with process in
   the State of Delaware in any proceeding for the enforcement of any
   obligation of Investments and in any proceeding for the enforcement of the
   rights of a dissenting stockholder of Investments pursuant to Section 262
   of the Delaware General Corporation Law; and (ii) irrevocably appoints the
   Secretary of State of the State of Delaware as its agent to accept service
   of process in any such proceeding.

        FIFTH:  Anything herein or elsewhere to the contrary notwithstanding,
   this Agreement may be terminated and abandoned by the Boards of Directors
   of the parties hereto at any time prior to the date that the requisite
   filings are made in the offices of the Secretary of State of the State of
   Delaware and the  Secretary of State of the Commonwealth of Massachusetts,
   respectively.  This Agreement may be amended by the Board of Directors of
   the parties hereto at any time prior to the date that the requisite filings
   are made in the offices of the Secretary of State of Delaware and the
   Secretary of State of Massachusetts, respectively, provided that an
   amendment made subsequent to the approval of this Agreement by the
   Shareholder shall not (1) alter or change the amount or kind of shares,
   securities, cash, property and/or rights to be received in exchange for or
PAGE
<PAGE>


        CUSIP No.  88355K101           13D            Page 16 of 16 Pages


   on conversion of all or any of the shares of Investments, (2) alter or
   change any term of the Articles of Incorporation of the surviving
   corporation to be effected by the Merger, or (3) alter or change any of the
   terms and conditions of this Agreement if such alteration or change would
   adversely affect the Shareholder.

        SIXTH:

             (a)  This Agreement may be executed in several counterparts, each
   of which shall be deemed an original, but all of which together shall
   constitute one and the same instrument.

             (b)  TMD and Investments agree to execute and deliver such other
   documents, certificates, agreements and other writings and to take such
   other actions as may be necessary or desirable in order to consummate or
   implement the transactions contemplated by this Agreement.

             (c)  This Agreement shall be governed by the laws of the
   Commonwealth of Massachusetts applicable to agreements made and to be
   performed wholly within such jurisdiction, without regard to the conflicts
   of laws provisions thereof.    

        IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
   executed as of the date first written above.

                                 THERMEDICS INC.


                                 By: /s/ John W. Wood, Jr.
                                     -----------------------------
                                 Name:  John W. Wood, Jr.
                                 Title:  President and Chief Executive Officer
   ATTEST:


   By:   /s/ Sandra L. Lambert
         ----------------------------
         Sandra L. Lambert, Clerk

                                 TMO TCA INVESTMENTS INC.


                                 By: /s/ John N. Hatsopoulos
                                     -----------------------
                                 Name:  John N. Hatsopoulos
                                 Title: President

   ATTEST:


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


   AA960390049
PAGE
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