THERMO ELECTRON CORP
SC 13D/A, 1998-04-15
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)

                            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
            (781) 622-1000                   Waltham, MA  02254-9046
        -----------------------             ----------------------------

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

                                February 27, 1998
              ----------------------------------------------------
             (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>





                     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 
                         10,037,389
           SHARES
               
        BENEFICIALLY  8  SHARED VOTING POWER
               
          OWNED BY       0
                      9  SOLE DISPOSITIVE POWER
             EACH
                         10,037,389
          REPORTING
                      10 SHARED VOTING POWER
         PERSON WITH
                         0
PAGE
<PAGE>





             11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
                     REPORTING PERSON

                     10,037,389


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


             13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                     65.3%
             14      TYPE OF REPORTING PERSON *

                     CO
PAGE
<PAGE>





             Thermo Electron Corporation hereby amends its statement on
        Schedule 13D relating to the shares (the "Shares") of common
        stock, par value $.01 per share, of ThermoSpectra Corporation
        (the "Issuer"), as set forth below.

        Item 2.  Identity and Background.

             Item 2 is hereby amended and restated in its entirety as
        follows:

             This Amendment is being filed by Thermo Electron Corporation
        (the "Reporting Person"), pursuant to Rule 13d-2, to reflect an
        increase in the Reporting Person's holdings of the Issuer's
        Shares since the Reporting Person's last filing on Schedule 13D,
        in September 1997, of more than one percent.  The Reporting
        Person holds the Shares of the Issuer that are the subject of
        this Amendment through one or more controlled subsidiaries.  As
        of the date of this Amendment, 8,998,836 Shares were held by
        Thermo Instrument Systems Inc. ("Thermo Instrument"), a
        majority-owned subsidiary of the Reporting Person.  

             The Reporting Person 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.  The Reporting Person 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.

             The principal business address and principal office address
        of the Reporting Person is 81 Wyman Street, Waltham,
        Massachusetts 02254-9046.  The Reporting Person is a Delaware
        corporation.

             Appendix A attached to this Schedule 13D sets forth with
        respect to each executive officer and director of the Reporting
        Person 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 Person, there is
        no person who may be deemed to be a controlling person of the
        Reporting Person.

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





             During the last five years, neither the Reporting Person nor
        (to the knowledge of the Reporting Person) any executive officer
        or director of the Reporting Person 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.

             Item 3 is hereby amended and restated in its entirety as
        follows:

             The Reporting Person has expended approximately
        $2,308,281.00 in purchasing securities of the Issuer since the
        date of its last filing on Schedule 13D.  These funds were paid
        out of the Reporting Person's working capital.

        Item 4.  Purpose of Transaction

             Item 4 is hereby amended and restated in its entirety as
        follows:

             The Reporting Person 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 by Thermo Instrument.  The Reporting
        Person 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, the Reporting Person will
        consider various relevant factors, including its 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 Person 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
        the Reporting Person nor, to the Reporting Person's knowledge,
        any of the executive officers or directors of the Reporting
        Person 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
        Person 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.

             Items 5(a) - (c) are hereby amended and restated in their
        entirety as follows:
PAGE
<PAGE>





             (a)  The Shares beneficially owned by the Reporting Person
        include 1,038,553 Shares, or approximately 6.8% of the
        outstanding Shares, owned directly by the Reporting Person, and
        8,998,836 Shares, or approximately 58.5% of the outstanding
        Shares, owned by Thermo Instrument.  To the knowledge of the
        Reporting Person, the executive officers and directors of the
        Reporting Person beneficially own an aggregate of 130,650 Shares
        or approximately 0.9% of the outstanding Shares.  To the
        knowledge of the Reporting Person, the Shares beneficially owned
        by all executive officers and directors of the Reporting Person
        include 118,650 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 Person who owns Shares is set forth below.


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


        John M. Albertine                        1,000
        Peter O. Crisp                           1,000

        Elias P. Gyftopoulos                     21,000
        George N. Hatsopoulos                    24,750
        John N. Hatsopoulos                      24,400

        Frank Jungers                            5,500
        Paul F. Kelleher                         5,000
        Robert A. McCabe                         1,500

        Frank E. Morris                          1,000
        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
        Roger D. Wellington                      1,000
        John W. Wood Jr.                         5,000

        All directors and                       130,650
        current executive
        officers as a group (17
        persons)

        ___________________

        (1)  Shares reported as beneficially owned by Dr. Albertine, Mr.
        Crisp, Dr. Gyftopoulos, Dr. G. Hatsopoulos, Mr. J. Hatsopoulos,
        Mr. Jungers, Mr. Kelleher, Mr. McCabe, Dr. Morris, Mr. Noble, Ms.
        Olayan, Mr. Pantazelos, Mr. Rainville, Mr. Smith, Mr. Wellington,
        Mr. Wood and all directors and executive officers as a group
        include 1,000, 1,000, 20,000, 24,750, 24,400, 1,500, 5,000,
PAGE
<PAGE>





        1,500, 1,000, 1,000, 1,000, 2,500, 10,000, 20,000, 1,000, 3,000
        and 118,650 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 Person are also directors or executive officers of the
        Issuer, all such persons disclaim beneficial ownership of the
        Shares owned by the Reporting Person.

             (b)  The Reporting Person and the executive officers and
        directors of the Reporting Person have the sole power to vote and
        dispose of the Shares each such person owns.

             (c)  The Reporting Person has effected the following
        transactions with respect to the Shares during the past 60 days:

            Date      Amount   Price Per Share        Transfer Type

          12/01/97     1,800        $9.75        Purchase on Open Market
          12/03/97      200         $9.81        Purchase on Open Market
          12/03/97     1,800        $9.63        Purchase on Open Market

          12/05/97      600         $9.75        Purchase on Open Market
          12/05/97     1,100        $9.94        Purchase on Open Market
          12/08/97      600         $9.75        Purchase on Open Market

          12/08/97     1,000        $9.88        Purchase on Open Market
          12/09/97     1,700        $9.81        Purchase on Open Market
          12/10/97     1,800        $9.75        Purchase on Open Market

          12/11/97     1,800        $9.44        Purchase on Open Market
          12/12/97     1,800        $9.44        Purchase on Open Market
          12/16/97     1,400        $9.63        Purchase on Open Market

          12/16/97      200         $9.50        Purchase on Open Market
          12/17/97     1,700        $9.50        Purchase on Open Market

          12/18/97     1,500        $9.50        Purchase on Open Market
          12/19/97     1,500        $9.00        Purchase on Open Market
          12/19/97    40,000        $9.13        Purchase on Open Market

          12/22/97     1,600        $9.31        Purchase on Open Market
          12/23/97     1,600        $9.19        Purchase on Open Market
          12/24/97     7,300        $9.50        Purchase on Open Market

          12/26/97     1,100        $9.50        Purchase on Open Market
          12/26/97      500         $9.38        Purchase on Open Market
          12/30/97     1,600        $9.81        Purchase on Open Market

          12/30/97    66,000        $9.75        Purchase on Open Market
          12/31/97      200         $9.63        Purchase on Open Market
          12/31/97      100         $10.00       Purchae on Open Market
PAGE
<PAGE>





          02/17/98      500         $8.63        Purchase on Open Market

          02/19/98      900         $9.00        Purchase on Open Market
          02/19/98      400         $8.75        Purchase on Open Market
          02/20/98     1,000        $8.88        Purchase on Open Market

          02/23/98     1,100        $8.94        Purchase on Open Market
          02/24/98     8,100        $9.25        Purchase on Open Market
          02/27/98     8,300        $9.75        Purchase on Open Market

          03/02/98      800         $9.94        Purchase on Open Market
          03/02/98      500         $9.75        Purchase on Open Market
          03/03/98     1,300        $9.94        Purchase on Open Market

          03/04/98     1,300        $10.50       Purchase on Open Market
          03/05/98     1,300        $10.25       Purchase on Open Market
          03/06/98     8,800        $10.00       Purchase on Open Market

          03/16/98     1,800        $9.88        Purchase on Open Market
          03/17/98     9,600        $9.88        Purchase on Open Market

          03/18/98     1,000        $9.81        Purchase on Open Market
          03/19/98     1,800        $10.00       Purchase on Open Market
          03/20/98     1,800        $10.00       Purchase on Open Market

          03/23/98     2,400        $10.50       Purchase on Open Market
          03/24/98     5,000        $10.00       Purchase on Open Market
          03/24/98     2,400        $9.88        Purchase on Open Market

          03/25/98     2,400        $9.75        Purchase on Open Market
          03/26/98     2,400        $9.50        Purchase on Open Market
          03/31/98     3,600        $9.38        Purchase on Open Market

          04/01/98     3,600        $9.38        Purchase on Open Market
          04/03/98     3,600        $9.38        Purchase on Open Market
          04/06/98     4,300        $9.50        Purchase on Open Market

          04/08/98     4,300        $9.38        Purchase on Open Market

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

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

             The first paragraph of Item 6 is hereby amended and restated
        in its entirety as follows:

             Of the 10,037,389 Shares beneficially owned by the Reporting
        Person, 48,800 Shares are subject to options to acquire such
        Shares granted by the Reporting Person pursuant to its director
        and employee stock option plans.  The executive officers and
PAGE
<PAGE>





        directors of the Reporting Person have the right, pursuant to
        such options, to acquire 15,150 Shares.  In addition, the
        following officers and directors of the Reporting Person 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. 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.
PAGE
<PAGE>







        Signature

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

        Date: April 15, 1998               THERMO ELECTRON CORPORATION


                                           By:  /s/ Melissa F. Riordan
                                                -------------------------
                                                Melissa F. Riordan
                                                Treasurer
PAGE
<PAGE>





        Signature

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

        Date: April 15, 1998               THERMO ELECTRON CORPORATION


                                           By:   /s/ Melissa F. Riordan
                                                -------------------------
                                                Melissa F. Riordan
                                                Treasurer


        AA981030007
PAGE
<PAGE>





        Appendix A  is hereby  amended and  restated in  its entirety  as
        follows:

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

             The following individuals are executive officers or
        directors of the Reporting Person.  Unless otherwise noted, all
        such individuals are citizens of the United States.  Unless
        otherwise noted, the business address of each executive officer
        of the Reporting Person is 81 Wyman Street, Waltham,
        Massachusetts 02254-9046.

        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 was, until August 1997, a General Partner of
        Venrock Associates, a venture capital investment firm.  His
        address is 103 Horseshoe Road, Mill Neck, New York 11765-1005.

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

              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.
PAGE
<PAGE>





        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.

        Richard F. Syron:                       Director, Thermo Electron
        -----------------

             Mr. Syron has served as the Chairman and Chief Executive
        Officer of the American Stock Exchange since 1994.  Mr. Syron was
        President and Chief Executive Officer of the Federal Reserve Bank
        of Boston from 1989 to 1994.  His business address is 86 Trinity
        Place, New York, New York 10006.

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

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

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

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

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

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

        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,
        ----------------
PAGE
<PAGE>





                                                Thermo Electron








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