THERMOSPECTRA CORP
424B3, 1996-10-31
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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                                         Filed Pursuant to Rule 424(b)(3)
                                         of the Securities Act of 1933   
                                         (Registration No. 33-99110)     
        PROSPECTUS 
                                1,707,000 Shares 


                            THERMOSPECTRA CORPORATION

                                  Common Stock 

           This Prospectus relates to 1,707,000 shares (the "Shares") of
        Common Stock, par value $.01 per share (the "Common Stock"), of
        ThermoSpectra Corporation ("ThermoSpectra" or the "Company").
        The Shares may be offered by certain shareholders of the Company
        (the "Selling Shareholders") from time to time in transactions on
        the American Stock Exchange, in negotiated transactions, through
        the writing of options on the Shares, or a combination of such
        methods of sale, at fixed prices that may be changed, at market
        prices prevailing at the time of sale, at prices related to such

        prevailing market prices or at negotiated prices.  The Selling
        Shareholders may effect such transactions by selling the Shares
        to or through broker-dealers, and such broker-dealers may receive
        compensation in the form of discounts, concessions or commissions
        from the Selling Shareholders and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).  The
        Selling Shareholder and any broker-dealer who acts in connection
        with the sales of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act of
        1933, as amended (the "Securities Act"), and any commissions
        received by them and profit on any resale of the Shares as

        principal might be deemed to be underwriting discounts and
        commissions under the Securities Act.  The Shares were originally
        sold by the Company in private placements pursuant to certain
        Stock Purchase Agreements with the Company dated September 1,
        September 2, October 13 and December 2, 1994 and October 12,
        1995.  See "Selling Shareholders."
                                _______________ 

        The Common Stock offered hereby involves a high degree of risk. 
                    See "RISK FACTORS" beginning at page 4. 
                                _______________ 


          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES
        COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY
         STATE SECURITIESCOMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
          OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
PAGE
<PAGE>





                          ____________________________
           None of the proceeds from the sale of the Shares by the
        Selling Shareholders will be received by the Company.  The
        Company has agreed to bear all expenses (other than underwriting
        discounts and selling commissions, and fees and expenses of
        counsel or other advisers to the Selling Shareholders) in

        connection with the registration and sale of the Shares being
        registered hereby.  The Company has agreed to indemnify the
        Selling Shareholders against certain liabilities, including
        liabilities under the Securities Act as underwriter or otherwise.

                 The date of this Prospectus is October 30, 1996
                                _________________


           No dealer, salesman or other person has been authorized to
        give any information or to make any representations other than
        those contained or incorporated by reference in this Prospectus
        regarding the Company or the offering made by this Prospectus,

        and, if given or made, such information or representations must
        not be relied upon as having been authorized by the Company or by
        any other person.  All information contained in this Prospectus
        is as of the date of this Prospectus.  Neither the delivery of
        this Prospectus nor any sale or distribution and resale made
        hereunder shall, under any circumstances, create any implication
        that there has been no change in the affairs of the Company since
        the date hereof.  This Prospectus does not constitute an offer to
        sell or a solicitation of any offer to buy any security other
        than the securities covered by this Prospectus, nor does it
        constitute an offer to or solicitation of any person in any
        jurisdiction in which such offer or solicitation may not be
        lawfully made.


                                  _____________


                              AVAILABLE INFORMATION

           The Company is subject to the informational requirements of
        the Securities Exchange Act of 1934, as amended (the "Exchange
        Act"), and in accordance therewith files reports, proxy
        statements and other information with the Securities and Exchange
        Commission (the "Commission").  Such reports, proxy statements
        and other information can be inspected and copied at the public

        reference facilities maintained by the Commission at 450 Fifth
        Street, N.W., Washington, D.C. 20549, and at the following
        Regional Offices of the Commission:  500 West Madison Street,
        Suite 1400, Chicago, Illinois 60661, and 7 World Trade Center,
        Suite 1300, New York, New York 10048.  Copies of such material
        can also be obtained from the Public Reference Section of the

                                        2
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<PAGE>





        Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 at
        prescribed rates.  The Common Stock of the Company is listed on
        the American Stock Exchange, and the reports, proxy statements
        and other information filed by the Company with the Commission
        can be inspected at the offices of the American Stock Exchange,
        86 Trinity Place, New York, New York  10006.


           This Prospectus, which constitutes part of a Registration
        Statement filed by the Company with the Commission under the
        Securities Act, omits certain of the information contained in the
        Registration Statement.  Reference is hereby made to the
        Registration Statement and to the exhibits relating thereto for
        further information with respect to the Company and the Shares
        offered hereby.  Statements contained herein concerning
        provisions of documents are necessarily summaries of such
        documents, and each statement is qualified in its entirety by
        reference to the applicable document filed with the Commission.

           The Company undertakes to provide without charge to each
        person to whom a copy of this Prospectus has been delivered, on
        the written or oral request of such person, a copy of any or all
        of the documents that have been or may be incorporated in this
        Prospectus by reference, other than exhibits to such documents
        (unless such exhibits are specifically incorporated by reference
        therein).  Requests for such copies should be directed to:
        Sandra L. Lambert, Secretary, ThermoSpectra Corporation, c/o
        Thermo Electron Corporation, 81 Wyman Street, P. O. Box 9046,
        Waltham, Massachusetts 02254-9046 (telephone number:(617)
        622-1000).
                              ____________________

                                   THE COMPANY


           The Company develops, manufactures and markets precision
        imaging, inspection and measurement instruments based on
        high-speed data acquisition and digital processing technologies.
        These instruments are generally combined with proprietary
        operations and analysis software to provide industrial and
        research customers with integrated systems that address their
        specific needs. The Company's products include digital
        oscillographic recorders that continuously measure and monitor
        signals from various sensors; digital storage oscilloscopes
        ("DSOs") that are capable of taking hundreds of millions of
        measurements per second of transient signals or short bursts of

        data; data acquisition systems that combine the attributes of
        DSOs and digital oscillographic recorders; X-ray microanalyzers
        used as accessories to electron microscopes to provide elemental
        materials analysis as a supplement to the microscope's imaging
        capabilities; non-destructive X-ray inspection systems for
        process monitoring and quality control applications; specialty

                                        3
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<PAGE>





        X-ray tubes for industrial and medical applications; and confocal
        laser scanning microscopes that use laser light to generate
        precise optical images primarily for life science applications. 

           As of September 28, 1996, Thermo Instrument beneficially
        owned approximately 72% of the Company's outstanding Common
        Stock.  As of September 28, 1996, Thermo Instrument was an
        81%-owned subsidiary of Thermo Electron Corporation ("Thermo
        Electron").  The Company's principal executive offices are
        located at 81 Wyman Street, Waltham, Massachusetts, and its
        telephone number is (617) 622-1000. 


                                  RISK FACTORS

           Investors should carefully consider the following factors in
        evaluating the Company and its business before purchasing any of
        such shares.


           Uncertainty of Growth.  Certain of the markets in which the
        Company competes have been flat or declining over the past
        several years. The Company has identified a number of strategies
        it believes will allow it to grow its business, including
        acquiring complementary businesses; developing new applications
        for its technologies; and strengthening its presence in selected
        geographic markets. No assurance can be given that the Company
        will be able to successfully implement these strategies, or that
        these strategies will result in growth of the Company's business.

           Potential Increased Competition.  The Company predominantly
        sells its products in the high-performance segment of the markets
        in which it competes. The products in this segment are generally
        characterized by superior engineering and performance and compete
        more on product specifications than on price. The other segments
        of these markets are dominated by companies with substantially
        greater financial resources than those of the Company. If these
        larger companies enter the high-performance segment of the
        market, no assurance can be given that the Company will be able
        to successfully compete against them. 

           Need to Respond to Technological Change.  Many of the
        Company's products are primarily marketed based on their
        technology. In order to be successful, the Company believes that
        it will be important to continually improve the technology
        underlying its products. No assurance can be given that the
        Company will be able to do so or that a competitor of the Company
        will not develop technology or products that will render the
        Company's competing products non-competitive or obsolete. 



                                        4
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<PAGE>





           Risks Associated with Acquisition Strategy.  The Company's
        strategy includes the acquisition of underperforming businesses
        and technologies that complement or augment the Company's
        existing product lines.  Promising acquisitions are difficult to
        identify and complete for a number of reasons, including
        competition among prospective buyers and the need for regulatory
        approvals, including antitrust approvals.  There can be no
        assurance that the Company will be able to integrate any acquired
        businesses or make such businesses profitable.  

           Inability to Raise Future Capital; Possible Dilution.  In
        order to finance the acquisitions that are part of the Company's
        growth strategy, it may be necessary for the Company to raise
        additional funds either through public or private financings. Any
        equity or debt financing, if available at all, may be on terms
        which are not favorable to the Company and, in the case of an
        equity financing, could result in dilution to the Company's
        stockholders. 


           Possible Adverse Impact of Significant International
        Operations.  The Company expects that international sales will
        continue to represent a significant portion of its revenues. In
        fiscal 1995, international sales accounted for over 50% of the
        Company's total pro forma revenues. These sales carry a number of
        inherent risks, including risks associated with currency
        exchange, tariffs and other potential trade barriers, potentially
        reduced protection for intellectual property, the impact of
        recessionary environments in economies outside the United States
        and generally longer receivable collection patterns. 

           Risks Associated with Protection, Defense and Use of
        Intellectual Property.  The Company holds many patents relating
        to various aspects of its products, and believes that proprietary
        technical know-how is critical to many of its products.
        Proprietary rights relating to the Company's products are
        protected from unauthorized use by third parties only to the
        extent that they are covered by valid and enforceable patents or
        are maintained in confidence as trade secrets.  There can be no
        assurance that patents will issue from any pending or future
        patent applications owned by or licensed to the Company or that
        the claims allowed under any issued patents will be sufficiently
        broad to protect the Company's technology and, in the absence of
        patent protection, the Company may be vulnerable to competitors
        who attempt to copy the Company's products or gain access to its
        trade secrets and know-how.  Proceedings initiated by the Company
        to protect its proprietary rights could result in substantial
        costs to the Company.  There can be no assurance that competitors
        of the Company will not initiate litigation to challenge the
        validity of the Company's patents, or that they will not use
        their resources to design comparable products that do not

                                        5
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<PAGE>





        infringe the Company's patents.  There may also be pending or
        issued patents held by parties not affiliated with the Company
        that relate to the Company's products or technologies.  The
        Company may need to acquire licenses to, or contest the validity
        of, any such patents.  There can be no assurance that any license
        required under any such patent would be made available on
        acceptable terms or that the Company would prevail in any such
        contest.  The Company could incur substantial costs in defending
        itself in suits brought against it or in suits in which the
        Company may assert its patent rights against others.  If the
        outcome of any such litigation is unfavorable to the Company, the
        Company's business and results of operations could be materially
        adversely affected.  In addition, the Company relies on trade
        secrets and proprietary know-how which it seeks to protect, in
        part, by confidentiality agreements with its collaborators,
        employees and consultants.  There can be no assurance that these
        agreements will not be breached, that the Company would have
        adequate remedies for any breach or that the Company's trade
        secrets will not otherwise become known or be independently
        developed by competitors.

           Potential Conflict of Interest.  For financial reporting
        purposes, the Company's financial results are included in Thermo
        Instrument's and Thermo Electron's consolidated financial
        statements. Certain officers of the Company are also officers of
        Thermo Instrument, Thermo Electron and/or other subsidiaries of
        Thermo Electron, and are full-time employees of Thermo Instrument
        or Thermo Electron.  Such officers will devote only a portion of
        their working time to the affairs of the Company. The members of
        the Board of Directors and officers of the Company who are also
        affiliated with Thermo Instrument or Thermo Electron will
        consider not only the short-term and the long-term impact of
        operating decisions on the Company, but also the impact of such
        decisions on the consolidated financial results of Thermo
        Instrument and/or Thermo Electron. In some cases the impact of
        such decisions could be disadvantageous to the Company while
        advantageous to Thermo Instrument and/or Thermo Electron, or vice
        versa. The Company is a party to various agreements with Thermo
        Electron that may limit the Company's operating flexibility. 

           Lack of Voting Control.  The Company's shareholders do not
        have the right to cumulate votes for the election of directors.
        Thermo Instrument, which owns approximately 72% of the
        outstanding voting stock of the Company, has the power to elect
        the entire Board of Directors of the Company and to approve or
        disapprove any corporate actions submitted to a vote of the
        Company's shareholders. 

           Possible Volatility of Stock Price.  Since public trading of
        the Company's Common Stock commenced in August 1995, the market

                                        6
PAGE
<PAGE>





        price has fluctuated considerably, and it may continue to
        fluctuate in the future.  The Company believes that such factors
        as announcements relating to product development, other
        developments by the Company or its competitors, variations in
        quarterly operating results, and the volatility of the stock
        market, among other things, could cause the market price for the
        Common Stock to fluctuate substantially.

           Possible Adverse Effect from Sale of Shares Eligible for
        Future Sale.  The 8,999,186 shares of Common Stock owned by
        Thermo Instrument are eligible for sale under Rule 144. In
        addition, as long as Thermo Instrument is able to elect a
        majority of the Company's Board of Directors, it will be able to
        cause the Company at any time to register for resale all or a
        portion of the Common Stock owned by Thermo Instrument.
        Additional shares of Common Stock issuable upon exercise of
        options which have been or may be granted under the Company's
        stock-based compensation plans will become available for future
        sale in the public market at prescribed times. Sales of a
        significant number of shares of Common Stock in the public market
        could adversely affect the market price of the Common Stock.

           Lack of Dividends.  The Company has never paid any cash
        dividends on its Common Stock. The Board of Directors anticipates
        that for the foreseeable future the Company's earnings, if any,
        will be retained for use in the business and that no cash
        dividends will be paid on the Common Stock. 

                              SELLING SHAREHOLDERS

           The following table shows the names of the Selling
        Shareholders, the number of shares of the Company's Common Stock

        each owned, the number of Shares that may be offered by each of
        them pursuant to this Prospectus and the number of Shares each
        will own after completion of the offering, assuming all of the
        Shares being offered hereby are sold.
                                                                Shares
                                          Shares of             Owned
                                         Common Stock  Shares   After
                                        Owned Prior to Being  Completio
              Selling Shareholder        the Offering Offered  n of the
              -------------------        ------------ -------
                                             (1)               Offering
                                             ---               --------
        Lombard, Odier & Cie                 357,600  262,500   95,100
        Darier, Hentsch & Cie                192,000  160,000   32,000

        Chase Manhattan, N.A. TTEE for
          IBM Corp. Retirement Plan          116,850  116,850        0
        Pitt & Co.                           116,850  116,850        0
        Venrock Associates                   110,470  110,470        0

        CEPA SA                               90,000   90,000        0

                                        7
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<PAGE>





        Gerlach & Co.                         80,000   80,000        0
        Earl R. Lewis (2)                     55,000    5,000   50,000

        Discount Bank and Trust Company       52,850      750   52,100
        ABN AMRO (Switzerland)                50,750   50,750        0
        Crescent Holding GmbH                 50,000   50,000        0

        Venrock Associates II, L.P.           49,530   49,530        0
        BP Pension Trustees Limited           40,000   40,000        0
        HCM & Co.                             40,000   40,000        0

        Thomas Paine Investors LP             40,000   20,000   20,000
        J. Henry Schroder Bank AG             32,000   30,000    2,000
        AMBIT & CO.                           25,000   25,000        0

        Alexandra O. Bjorklund TTEE
          Alexandra O. Bjorklund 1988
          Trust U/A/D 11/11/88                20,000   15,000    5,000
        Peter Moser, Yiska Moser,
          Trustees FBO Yiska Moser
          Trust U/A/D 2/15/90                 20,000   10,000   10,000
        The 1985 Rufeh Family Trust           20,000   20,000        0
          U/A/D 12/20/85
        Gerald Feldman                        15,400   15,000      400

        Elias Samaras & Dennis
          Speliotis, Trustees, The
          Artemis Zavaliangos 1991            15,000   10,000    5,000
          Trust U/A/D 7/2/91
        Linda Bassin                          10,000   10,000        0
        Paul A. Berkman & Judith M.                                 
          Berkman, JTWROS                     10,000   10,000        0


        John Kosid                            10,000   10,000        0
        Ruth Patel                            10,000    7,000    3,000
        Judy Shapiro                          10,000   10,000        0

        WNC Corporation                       10,000   10,000        0
        Soginvest Banca Lugano                 8,900   7,500     1,400
        Thomas O. McCarthy                     8,000   5,000     3,000

        Richard V. Aghababian                  7,500   7,500         0
        Swiss Bank Corporation, Geneva         7,500   7,500         0
        Robert A. McCabe (3)                   6,818   6,818         0

        Michael Bollag                         6,000   6,000         0
        Volksbank Kufstein                     6,000   6,000         0
        Banque Clariden                        5,000   5,000         0

        Corman Foundation                      5,000   5,000         0
        Richard B. Felder                      5,000   5,000         0
        Henry A. Fredricks                     5,000   5,000         0


                                        8
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<PAGE>





        Richard J. Gusick, IRA Account
          Rollover, Cowen & Co. Cust.          6,500   5,000     1,500
        James Joseph Linus, Smith
          Barney IRA Custodian                 5,000   5,000         0

        Edwin McCarthy                         5,000   5,000         0
        Michael Mintz                          5,000   5,000         0
        Oddo et Cie                            5,000   5,000         0

        Peter Richman                          5,000   5,000         0
        Alan J. Rubin                          5,000   5,000         0
        Firooz Rufeh, Smith Barney as
        Rollover Custodian                     5,000   5,000         0

        Jackie L. Stone                        5,000   5,000         0
        Yoav & Cynthia Shmuely JTWROS          5,000   5,000     5,000
        Simon Zunamon                          5,000   5,000         0
        Richard & Christine Cowgill            4,400   4,000       400
        JTWROS

        Theobald M. Karch TTEE Theobald
          M. Karch Revocable Trust
          U/A/D 1/11/94 FBO Theobald M.        4,182   4,182         0
          Karch
        Stuart Albrecht                        4,000   4,000         0
        Baden-Wurttembergische Bank            4,000   4,000         0

        Michael H. Carstens & Ortrud M.        4,000   2,500     1,500
        Carstens JTWROS
        Stanley H. Feldberg & Theodora
          L. Feldberg, Trustees, The
          Stanley Feldberg 1985
          Revocable Trust dtd 12/20/85         4,000   4,000         0
        Ann Herrmann                           4,000   4,000         0
        Francis Jungers (4)                    4,000   2,000     2,000

        Leonard Russin                         4,000   4,000         0
        William O. Flannery                    3,500   3,500         0
        George R. & Joann L. Dick              3,000   3,000         0
        JTWROS

        Matthew K. Kwiatek                     3,000   3,000         0
        M.D. Funding, Inc.                     3,000   3,000         0
        Paris Nicolaides TTEE FBO
          George, Dora Razis U/A/D             3,000   3,000         0
          8/10/81


        Trude C. Taylor                        3,000   3,000         0
        James L. Fregosi                       2,800   2,000       800
        Seema Sachdeva & Rakeesh                
        Sachdeva JTWROS                        2,600   2,000       600



                                        9
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<PAGE>





        Walter S. Burrage, Jr.                 2,500   2,500         0
        Mark W. Cahill                         2,500   2,500         0

        David Clark Minority Trust             2,500   2,500         0
        Jonathan Clark Revocable Trust         2,500   2,500         0
        Kitty R. Clark Revocable Trust         2,500   2,500         0

        Focus Capital Corp.                    2,500   2,500         0
        Jonathan Piper                         2,500   2,500         0
        Patricia L. Riley Rev. Trust           2,500   2,500         0

        Marvin Sharfstein                      2,500   2,500         0
        Alvin J. Smith                         2,500   2,500         0
        Frank C. Strasburger                   2,500   2,500         0

        Robert Frankel & Pessia Frankel        2,000   2,000         0
        JTWROS
        Natalie Karp and Jason Karp            2,000   2,000         0
        Elaine Khalaf                          2,000   2,000         0

        Ronald Krinick                         2,000   2,000         0
        Murray Norkin & Lynne Norkin           2,000   2,000         0
        JTWROS
        Peter G. Pantazelos                    2,000   2,000         0
        Dr. Pairoj & Mrs. Surapee              2,000   1,000     1,000
        Ruktanonchai

        Lee Ruwitch                            2,000   2,000         0
        Michael J. Schmerin M.D. P.C.
          Retirement Trust U/A/D               2,000   2,000         0
          8/10/78
        Steven W. Spira                        2,000   2,000         0

        Maureen M. Sweeney                     2,000   1,000     1,000
        Windy City, Inc.                       2,000   2,000         0
        Nicholas T. Zervas                     2,000   2,000         0

        Michael Zuk                            2,000   2,000         0
        Sam Wietschner & Tova
        Wietschner JTWROS                      1,800   1,800         0
        Lloyd Arnel                            1,500   1,500         0
        James C. Linus TTEE James J. &
          Sylvia R. Linus Grandchildren
          Trust U/A/D 12/30/92                 1,500   1,500         0

        Jacqueline O'Neill                     1,500   1,000       500
        Steven J. Coleman                      1,300   1,000       300
        Suresh B. & Rambha S. Bhalala          1,200   1,000       200

        Max D. Caldwell                        1,200   1,000       200
        Robert A. Fein & Rena Gray
        Fein, JTWROS                           1,000   1,000         0
        Eugene Goodman                         1,000   1,000         0


                                       10
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<PAGE>





        Carlo Koch                             1,000   1,000         0
        Bruce Lenthall Minority Trust          1,000   1,000         0

        Elizabeth Lenthall Minority            1,000   1,000         0
        Trust
        Joshua Lenthall Minority Trust         1,000   1,000         0
        Jay V. Narola & Kaushika J.
        Narola JTWROS                          1,000   1,000         0

        Murray Norkin                          1,000   1,000         0
        Edward A. Sweeney                      1,000   1,000         0
        Joseph F. Sweeney                      1,000   1,000         0

        Alyssa A. Burrage Minority               500     500         0
        Trust
        Amanda B. Burrage Minority               500     500         0
        Trust
        Christopher L. Burrage Minority          500     500         0
        Trust
        Katherine S. Burrage Minority            500     500         0
        Trust

        Susannah D. Burrage Minority             500     500         0
        Trust
        Terence Hogan                            460     460         0
        Bear Stearns IRA fbo Terence             217     217         0
        Hogan

        Charles McQuaid                          486     486         0
        Ralph Wanger                           2,317   2,317         0
        LZW Family Investment                    820     820         0
        Partnership


        Mone Anathan III                         658     658         0
        Robert D. Appelbaum                    1,283   1,283         0
        Ralph A. Bard, Jr., Trustee UAD
        2/12/83                                  256     256         0

        Bear Stearns IRA fbo Ben A.              346     346         0
        Beavers
        Ellen H. Block Revocable Trust
        DTD 8/29/86                            1,285   1,285         0
        Daryl D. Boddicker Trust                 657     657         0

        Ann K. Butler                          1,315   1,315         0
        William J. Cadogan                       577     577         0
        Common Sense Partners, L.P.            6,582   6,582         0

        Couderay Partners                      1,947   1,947         0
        Sara Crown 65 Trust                      131     131         0
        Terry D. Diamond Trust                   610     610         0
        John E. Doddridge                      1,752   1,752         0


                                       11
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<PAGE>





        Bear Stearns IRA fbo Joseph P.
        Durrett                                  516     516         0
        Eugene H. Edson                          579     579         0

        Stephen M. Ehrlichman                    256     256         0
        S. Cody Engle                            920     920         0
        Roxanne H. Frank Trust DTD               486     486         0
        3/16/84

        Samuel J. Gerson                         657     657         0
        Howard N. Gilbert                        657     657         0
        The Goldfeder Family Trust             1,249   1,249         0

        Lenore S. Greenberg Trust              1,050   1,050         0
        Madeline Halpern                       1,935   1,935         0
        J. Davis Hamlin                          889     889         0

        TrustgDTD 7/31/87Revocable             1,707   1,707         0

        Joan W. Harris Revocable Trust           244     244         0
        DTD 4/1/93
        William W. Harris Trust DTD              486     486         0
        6/22/84
        David F. Hinchman                        578     578         0

        Larry J. Hochberg Revocable              516     516         0
        Trust
        Roger L. Howe                          3,349   3,349         0
        Roger Howe Revocable Trust #2          1,030   1,030         0

        Jerome Kahn Jr. Revocable Trust
        DTD 10/16/87                             244     244         0
        Keim Family Partnership                  436     436         0
        Bear Stearns IRA fbo Alexander           128     128         0
        S. Knopfler
        Michael S. Koeneke                       517     517         0

        Alan J. Lacy                             578     578         0
        Lakeview Multi-Strategy Fund,            730     730         0
        L.P.
        Gladys K. Lazarus                      1,032   1,032         0

        Daniel H. Levy                           516     516         0
        John S. Lillard                          578     578         0
        J.M. Lozier Revocable Trust              517     517         0

        C.H. Randolph Lyon, Jr.                1,155   1,155         0
        Charles N. Matthewson Trust            1,315   1,315         0
        Bear Stearns IRA fbo Edward J.         1,032   1,032         0
        McCabe

        Robert G. McVicker                       516     516         0
        Meier Family Partnership                 640     640         0


                                       12
PAGE
<PAGE>





        Gerald B. Mitchell                       887     887         0
        MND Investment Company                   576     576         0

        S. William Pattis                        578     578         0
        Virginia H. Polsky Trust DTD             486     486         0
        8/5/94
        Qualified Terminal Interest              128     128         0
        Trust UW Harry C. Woldenberg

        Allen I. Questrom                      1,315   1,315         0
        Eric & Heather Reickert                  516     516         0
        Seahorse Investments, Inc.               826     826         0

        Henry Shapiro                            513     513         0
        G. Nichols Simonds                       517     517         0
        Bear Stearns IRA fbo Edward W.           577     577         0
        Smeds


        Christopher & Mary Susan                 577     577         0
        Steffen
        Michael & Susanna Steinberg              516     516         0
        Jerome H. Stone                          657     657         0

        Joseph G. Temple Jr.                   1,315   1,315         0
        Thermo Electron Corporation (6)    9,000,039   1,153  8,999,186
        James R. Trueman Trust DTD             6,551   6,551         0
        4/8/86

        Francis A. Waters                        521     521         0
        Winchester Partners                      243     243         0
        Rochelle Zell Revocable Trust          1,219   1,219         0

        Flying Squirrel Fund, L.P.                35      35         0

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

        (1)Except as otherwise reflected in the footnotes to this table,
           all share ownership includes Shares owned by the Selling
           Shareholders and shares that the Selling Shareholders have
           the right to acquire within 60 days of March 30, 1996,
           through the exercise of stock options.
        (2)Earl R. Lewis is Chairman of the Board and Director of the
           Company and Senior Vice President of Thermo Instrument.
        (3)Robert A. McCabe is a Director of Thermo Electron.
        (4)Francis Jungers is a Director of Thermo Electron.
        (5)Donald E. Noble is a Director of Thermo Electron.
        (6)Includes 8,999,186 shares of the Company's Common Stock owned

           by Thermo Instrument, an 81%-owned subsidiary of Thermo
           Electron.

           The Shares are being registered to permit public secondary
        trading of the Shares from time to time by the Selling
        Shareholders.  Of the Shares being offered by the Selling

                                       13
PAGE
<PAGE>





        Shareholders, 1,505,000 were sold by the Company in private
        placement transactions pursuant to Stock Purchase Agreements with
        the Company dated September 1, October 13 and December 2, 1994
        and 202,000 of the Shares being offered by the Selling
        Shareholders were sold by the Company in private placement
        transactions pursuant to Stock Purchase Agreements with the

        Company dated October 12, 1995 (collectively, the "Purchase
        Agreements").

           In the Purchase Agreements, the Company agreed, among other
        things, to bear all expenses (other than underwriting discounts,
        selling commissions, and fees and expenses of counsel and other
        advisors to the Selling Shareholders) in connection with the
        registration and sale of the Shares being offered by the Selling
        Shareholders. See "Sale of Shares."  The Company has agreed to
        prepare and file such amendments and supplements to the
        Registration Statement of which this Prospectus forms a part as
        may be necessary to keep the Registration Statement effective
        until all the Shares offered hereby have been sold pursuant

        thereto or until such Shares are no longer, by reason of Rule
        144(k) under the Securities Act or any other rule of similar
        effect, required to be registered for the public sale thereof by
        the Selling Shareholders.

                                 SALE OF SHARES

           The Company has been advised that the Selling Shareholders
        may sell Shares from time to time in transactions on the American
        Stock Exchange, in negotiated transactions, through the writing
        of options on the Shares, or a combination of such methods of
        sale, at fixed prices which may be changed, at market prices
        prevailing at the time of sale, at prices related to such

        prevailing market price or at negotiated prices.  The Selling
        Shareholders may effect such transactions by selling the Shares
        to or through broker-dealers, and such broker-dealers may receive
        compensation in the form of discounts, concessions or commissions
        from the Selling Shareholders and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).

           The Selling Shareholders and any broker-dealers who act in
        connection with the sale of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act, and

        any commissions received by them and profit on any resale of the
        Shares as principal might be deemed to be underwriting discounts
        and commissions under the Securities Act.  The Company has agreed
        to indemnify the Selling Shareholders against certain
        liabilities, including liabilities under the Securities Act as
        underwriter or otherwise.

                                       14
PAGE
<PAGE>






                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

             The following documents previously filed with the Commission
        are incorporated in this Prospectus by reference:


             (a)  The Company's Annual Report on Form 10-K for the year
                  ended December 30, 1995.

             (b)  The Company's Quarterly Report on Form 10-Q for the
                  three-month period ended March 30, 1996.

             (c)  The Company's Quarterly Report on Form 10-Q for the
                  three-month period ended June 29, 1996.

             (d)  The Company's Current Report on Form 8-K filed with the
                  Commission on August 19, 1996 with respect to events
                  occurring on August 5, 1996, as amended by Form 8K-A
                  filed with the Commission on October 1, 1996.


             (e)  The description of the Common Stock which is contained
                  in the Company's Registration Statement on Form 8-A,
                  filed under the Exchange Act, as amended.

             All reports and other documents filed by the Company
        pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange
        Act subsequent to the date of this Prospectus and prior to the
        termination of the offering made hereby shall be deemed to be
        incorporated by reference in this Prospectus and to be a part
        hereof from the respective dates of filing such documents.  Any
        statement contained in a document incorporated or deemed to be
        incorporated by reference herein shall be deemed to be modified

        or superseded for purposes of this Prospectus to the extent that
        a statement contained herein modifies, supersedes or replaces
        that statement.  Any statement so modified or superseded shall
        not be deemed, except as so modified or superseded, to constitute
        a part of this Prospectus.

                                  LEGAL MATTERS

           Certain legal matters relating to the Shares offered hereby
        have been passed upon for the Company by Seth H. Hoogasian, Esq.,
        General Counsel of Thermo Electron, Thermo Instrument and the
        Company.   As of the date of such opinion, Mr. Hoogasian owned or

        had the right to acquire 5,000 shares of Common Stock, 23,438
        shares of common stock of Thermo Instrument and 82,385 shares of
        common stock of Thermo Electron. 

                                    EXPERTS 


                                       15
PAGE
<PAGE>





           The financial statements and schedules of the Company
        incorporated in this Prospectus by reference to the Company's
        Annual Report on Form 10-K for the year ended December 30, 1995
        and the financial statements of Kevex, Inc. incorporated in this
        Prospectus by  reference to the Company's Current Report on Form
        8-K filed with the Commission on August 19, 1996 with respect to

        events occurring on August 5, 1996, as amended by Form 8K-A filed
        with the Commission on October 1, 1996, have been audited by
        Arthur Andersen LLP, independent public accountants, to the
        extent and for the periods as indicated in their reports with
        respect thereto, and are incorporated herein and therein in
        reliance upon the authority of said firm as experts in giving
        said reports. 



        AA963040026





































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