THERMO INSTRUMENT SYSTEMS INC
10-K, 1998-03-12
MEASURING & CONTROLLING DEVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                    FORM 10-K

   (mark one)
   [ X ] Annual Report Pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934 for the fiscal year ended January 3, 1998
   [   ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934

                          Commission file number 1-9786

                         THERMO INSTRUMENT SYSTEMS INC.
             (Exact name of Registrant as specified in its charter)
   Delaware                                                         04-2925809
   (State or other jurisdiction of                            (I.R.S. Employer
   incorporation or organization)                          Identification No.)

   860 West Airport Freeway
   Suite 301
   Hurst, Texas                                                          76054
   (Address of principal executive offices)                         (Zip Code)
       Registrant's telephone number, including area code: (617) 622-1000

           Securities registered pursuant to Section 12(b) of the Act:

        Title of each class        Name of each exchange on which registered
    ----------------------------   -----------------------------------------
    Common Stock, $.10 par value            American Stock Exchange
           Securities registered pursuant to Section 12(g) of the Act:
                                      None

   Indicate by check mark whether the Registrant (1) has filed all reports
   required to be filed by Section 13 or 15(d) of the Securities Exchange Act
   of 1934 during the preceding 12 months, and (2) has been subject to the
   filing requirements for at least the past 90 days. Yes [ X ] No [  ]

   Indicate by check mark if disclosure of delinquent filers pursuant to Item
   405 of Regulation S-K is not contained herein, and will not be contained,
   to the best of the Registrant's knowledge, in definitive proxy or
   information statements incorporated by reference into Part III of this Form
   10-K or any amendment to this Form 10-K. [  ]
   The aggregate market value of the voting stock held by nonaffiliates of the
   Registrant as of January 30, 1998, was approximately $622,251,000.

   As of January 30, 1998, the Registrant had 122,045,212 shares of Common
   Stock outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

   Portions of the Registrant's Annual Report to Shareholders for the year
   ended January 3, 1998, are incorporated by reference into Parts I and II.
   Portions of the Registrant's definitive Proxy Statement for the Annual
   Meeting of Shareholders to be held on June 1, 1998, are incorporated by
   reference into Part III.
PAGE
<PAGE>
                                     PART I

    Item 1. Business
            --------

    (a) General Development of Business.
        -------------------------------
        Thermo Instrument Systems Inc. (the Company or the Registrant) is a
    worldwide leader in the development, manufacture, and marketing of
    analytical instruments used to identify and quantify complex molecular
    compounds and elements in gases, liquids, and solids. The Company also
    provides instruments used to monitor radioactivity and air pollution, and
    to control, image, inspect, and measure various industrial processes and
    life-sciences phenomena. Through its 77%-owned ThermoSpectra Corporation
    subsidiary, the Company develops, manufactures, and markets imaging and
    inspection, temperature-control, and test and measurement instruments.
    The Company's 88%-owned ThermoQuest Corporation subsidiary develops,
    manufactures, and sells mass spectrometers, liquid chromatographs, and
    gas chromatographs for the pharmaceutical, environmental, and industrial
    marketplaces. These analytical instruments are used in the quantitative
    and qualitative chemical analysis of organic and inorganic compounds at
    ultra-trace levels of detection. In addition, the Company manufactures
    scientific equipment for the preparation and preservation of chemical
    samples, and consumables for the chromatography industry. Through its
    91%-owned Thermo Optek Corporation subsidiary, the Company develops,
    manufactures, and markets analytical light-based instruments that are
    used in the quantitative and qualitative chemical analysis of elements
    and molecular compounds. Through its 70%-owned Thermo BioAnalysis
    Corporation subsidiary, the Company develops, manufactures, and markets
    instruments, consumables, and information management systems used in
    biochemical research and production, as well as in clinical diagnostics.
    The Company's 60%-owned Metrika Systems Corporation subsidiary develops,
    manufactures, and markets on-line process optimization systems that
    employ proprietary, ultra-high-speed advanced scientific measurement
    technologies for applications in raw-materials analysis and
    finished-materials quality control. The Company's 78%-owned Thermo Vision
    Corporation subsidiary designs, manufactures, and markets a diverse array
    of photonics products that are used in a number of industries for
    research, testing, detecting, and manufacturing applications. The
    Company's 87%-owned, privately held ONIX Systems Inc. subsidiary designs,
    develops, markets, and services sophisticated field measurement
    instruments and on-line sensors. Through its wholly owned subsidiaries,
    the Company also manufactures monitoring instruments to detect and
    monitor environmental pollutants and provides clinical laboratory
    equipment and consumables that assist in the diagnosis of various
    diseases.

        The Company has adopted a strategy of spinning out certain of its
    businesses into separate subsidiaries and having these subsidiaries sell
    a minority interest to outside investors. The Company believes that this
    strategy provides additional motivation and incentives for the management
    of the subsidiaries through the establishment of subsidiary-level stock
    option incentive programs, as well as capital to support the
    subsidiaries' growth. During 1997*, Metrika Systems and Thermo Vision 

    * References to 1997, 1996, and 1995 herein are for the fiscal years
      ended January 3, 1998, December 28, 1996, and December 30, 1995,
      respectively.
                                        2PAGE
<PAGE>
    sold shares of their common stock in initial public offerings and ONIX
    and ThermoQuest sold shares of their common stock in private placements
    for aggregate net proceeds of $86.3 million. See Note 11 to Consolidated
    Financial Statements in the Registrant's 1997 Annual Report to
    Shareholders for a description of the issuance of stock by the Company's
    subsidiaries.

        The Company historically has expanded both through the acquisition of
    companies and product lines and through internal development of new
    products and technologies. During the past several years, the Company has
    completed a number of complementary acquisitions that have provided
    additional technologies, specialized manufacturing or product development
    expertise, and broader capabilities in marketing and distribution. In
    March 1997, the Company acquired 95% of Life Sciences International PLC
    (Life Sciences), a London Stock Exchange-listed company. Subsequently,
    the Company acquired the remaining shares of Life Sciences' capital
    stock. The aggregate purchase price for Life Sciences was approximately
    $442.8 million, net of $55.8 million of cash acquired. The purchase price
    includes the repayment of $105.0 million of Life Sciences' bank debt.
    Life Sciences manufactures laboratory science equipment, appliances,
    instruments, consumables, and reagents for the research, clinical, and
    industrial markets.

        The Company was incorporated in Delaware in May 1986 as a wholly
    owned subsidiary of Thermo Electron Corporation to operate the
    instruments businesses that were previously conducted by several Thermo
    Electron subsidiaries. As of January 3, 1998, Thermo Electron owned
    99,819,138 shares, or 82%, of the Company's outstanding common stock.
    Thermo Electron provides analytical and monitoring instruments;
    biomedical products including heart-assist devices, respiratory-care
    equipment, and mammography systems; paper recycling and papermaking
    equipment; alternative-energy systems; industrial process equipment; and
    other specialized products. Thermo Electron also provides industrial
    outsourcing, laboratory, and metallurgical services, and conducts
    advanced-technology research and development.

        Thermo Electron intends for the foreseeable future to maintain at
    least 80% ownership of the Company, so that it may continue to file
    consolidated U.S. federal and certain state income tax returns with the
    Company. This may require the purchase by Thermo Electron of additional
    shares of common stock and/or convertible debentures of the Company from
    time to time as the number of outstanding shares of the Company
    increases. These and any other purchases may be made either in the open
    market or directly from the Company or pursuant to conversions of the
    Company's 3 3/4% senior convertible note due 2000 held by Thermo
    Electron. See Notes 5 and 7 to Consolidated Financial Statements in the
    Registrant's 1997 Annual Report to Shareholders for a description of the
    Company's outstanding stock options and convertible obligations. During
    1997, Thermo Electron purchased 739,600 shares of the Company's common
    stock in the open market at a total cost of $24.1 million.


                                        3PAGE
<PAGE>
    Forward-looking Statements

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Annual Report
    on Form 10-K. For this purpose, any statements contained herein that are
    not statements of historical fact may be deemed to be forward-looking
    statements. Without limiting the foregoing, the words "believes,"
    "anticipates," "plans," "expects," "seeks," "estimates," and similar
    expressions are intended to identify forward-looking statements. There
    are a number of important factors that could cause the results of the
    Company to differ materially from those indicated by such forward-looking
    statements, including those detailed under the heading "Forward-looking
    Statements" in the Registrant's 1997 Annual Report to Shareholders, which
    statements are incorporated herein by reference.

    (b) Financial Information About Industry Segments.
        ---------------------------------------------

        The Company operates in one business segment: the developing,
    manufacturing, marketing, and servicing of analytical instruments and
    software used for the identification and quantification of complex
    molecular compounds and elements in gases, liquids, and solids. Uses
    include pharmaceutical drug research and clinical diagnostics, monitoring
    and measuring environmental pollutants, industrial inspection, and test
    and control for quality assurance and productivity improvement. In
    addition, the Company develops, manufactures, markets, and services
    equipment for the measurement, preparation, storage, and automation of
    sample materials, and photonics products and vacuum components for
    original equipment manufacturers.

    (c) Description of Business.
        -----------------------

        Principal Products and Services

        The Company manufactures and markets instruments that employ a
    variety of advanced analytical techniques to determine the composition,
    structure, and physical properties of natural and synthetic substances.
    The Company's instruments are used for analysis, test and measurement,
    environmental and nuclear monitoring, process control, and in life
    sciences applications. Revenues from analytical and test and measurement
    instruments were $1,084.3 million, $821.6 million, and $537.5 million in
    1997, 1996, and 1995, respectively.

        ThermoSpectra develops, manufactures, and markets precision imaging
    and inspection, temperature-control, and test and measurement
    instruments. 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.

        ThermoQuest is a leading provider of mass spectrometers, liquid
    chromatographs, and gas chromatographs for the pharmaceutical,
    environmental, and industrial marketplaces. These analytical instruments
    are used in the quantitative and qualitative chemical analysis of organic
    and inorganic compounds at ultratrace levels of detection. ThermoQuest

                                        4PAGE
<PAGE>
    also supplies scientific equipment for the preparation and preservation
    of chemical samples, and consumables for the chromatography industry.

        Thermo Optek is a worldwide leader in the development, manufacture,
    and marketing of analytical instruments that use a range of light- and
    energy-based techniques. Thermo Optek's instruments are used in the
    quantitative and qualitative chemical analysis of elements and molecular
    compounds in a variety of solids, liquids, and gases.

        Thermo BioAnalysis develops, manufactures, and markets instruments,
    consumables, and information-management systems used in biochemical
    research and production, as well as in clinical diagnostics. Thermo
    BioAnalysis focuses on three principal product areas: life sciences
    instrumentation and consumables, information-management systems, and
    health physics instrumentation.

        Metrika Systems manufactures process optimization systems that
    provide on-line, real-time analysis of the elemental composition of bulk
    raw materials in basic-materials production processes, including coal,
    cement, and minerals. In addition, Metrika Systems manufactures
    industrial gauging and process-control instruments and systems used
    principally by manufacturers of finished web materials, such as sheet
    metal, rubber, and plastic foils, to measure and control parameters such
    as thickness and coating weight of such materials.

        Thermo Vision, which became a public subsidiary of the Company in
    December 1997, designs, manufactures, and markets a diverse array of
    photonics (light-based) products, including optical components, imaging
    sensors and systems, lasers, optically based instruments, opto-
    electronics, and fiber optics. These products are used in applications
    including medical diagnostics, semiconductor production, X-ray imaging,
    physics research, and telecommunications.

        ONIX Systems, a privately held subsidiary of the Company, designs,
    develops, markets, and services sophisticated field measurement
    instruments and on-line sensors for process-control industries,
    particularly oil and gas. Systems provide real-time data collection,
    analysis, and local control functions regarding the flow, level, density,
    or composition of a particular material.

        Thermo Instrument also has wholly owned businesses, including the
    Life Sciences Clinical Instrument Division, which provides an array of
    clinical laboratory equipment and consumables, and Thermo Monitoring
    Instruments, which produces instruments and complete systems for
    detecting and monitoring environmental pollutants from industrial and
    mobile sources, and for detecting radioactive contamination.

        Backlog

        The Company's backlog of firm orders was $298.9 million as of January
    3, 1998, and $266.6 million as of December 28, 1996, The Company
    anticipates that substantially all of the backlog as of January 3, 1998,
    will be shipped or completed during 1998. Certain of such orders are
    cancellable by the customer upon payment of a cancellation charge. The

                                        5PAGE
<PAGE>
    Company does not believe that the level of, or changes in the level of,
    its backlog is necessarily indicative of intermediate or long-term trends
    in its business.

        Competition

        The Company generally competes on the basis of technical advances
    that result in new products and improved price/performance ratios,
    reputation among customers as a quality leader for products and services,
    and active research and application-development programs. To a lesser
    extent, the Company competes on the basis of price.

        In many markets, the Company competes with large analytical-
    instrument companies such as Hewlett-Packard Co., Perkin-Elmer
    Corporation, Varian Associates, Inc., and Hitachi, Ltd. Certain products
    manufactured by the Company also compete with products sold by numerous
    smaller, specialized firms.

        ThermoSpectra competes in each of its markets primarily on the basis
    of technical advances that result in new products and improved
    price/performance ratios and reputation among customers as a quality
    leader for products and services. To a lesser extent, ThermoSpectra
    competes on the basis of price. The market for digital oscillographic
    recorders is characterized by competition among a number of competitors,
    including Astro-Med, Inc. and Yokogawa Electric Corporation. The
    general-purpose digital storage oscilloscope market is dominated by
    Tektronix, Inc. and Hewlett-Packard. ThermoSpectra competes in the
    high-end of the X-ray microanalysis market on the basis of quality and
    technology, and in the mid-end of the X-ray microanalysis market on the
    basis of quality, performance, and price. The main competitor in this
    segment is Link Analytical Limited, a wholly owned subsidiary of Oxford
    Instruments plc. In the X-ray inspection market, ThermoSpectra competes
    with smaller companies in the manual segment of the market, and primarily
    with Four Pi Systems, a subsidiary of Hewlett-Packard, in the automated
    segment. In the digital-video segment of the confocal microscopy market,
    ThermoSpectra competes primarily with Nikon Inc., as well as Bio-Rad
    Laboratories, Inc. ThermoSpectra competes in the scanning-probe
    microscope market on the basis of quality, performance, and, to a lesser
    extent, price. The dominant competitor in this market is Digital
    Instruments, Inc. In the temperature-control market, the Company competes
    primarily on the basis of performance, price, and customer service. The
    main competitors in this market are Lauder and Jalabo.

        ThermoQuest competes in each of its markets primarily on technical
    performance, customer service and support and, to a lesser extent, price.
    ThermoQuest's principal competitors in the mass spectrometry market
    include Hewlett-Packard, Waters Instruments Inc. (MicroMass), Shimadzu
    Corporation, and Perkin-Elmer. ThermoQuest's principal competitors in the
    liquid chromatography market include Waters, Hewlett-Packard, Shimadzu,
    and Perkin-Elmer. In the gas chromatography market, ThermoQuest competes
    with numerous companies including Hewlett-Packard, Varian, Perkin-Elmer,
    and Shimadzu. ThermoQuest's principal competitors in the sample
    preparation and preservation markets include Jouan S.A., NuAire, Sanyo
    Electric, and Labconco. ThermoQuest's principal competitors in the

                                        6PAGE
<PAGE>
    chromatography consumables market include Waters, Merck, Phenomenex, and
    numerous regional suppliers.

        Thermo Optek competes in each of its markets primarily on
    performance, reliability, customer service, and price. In the market for
    AE and AA spectrometers and ICP/MS instruments, Thermo Optek competes
    primarily with Perkin-Elmer and, to a lesser extent, Varian. Thermo Optek
    competes in the arc/spark market primarily with Spectro. In the FT-IR and
    FT-Raman markets, Thermo Optek competes primarily with Perkin-Elmer and
    Bio-Rad. Thermo Optek entered the market for UV/Vis instruments with its
    acquisition of Unicam in 1995. The primary competitor in this market is
    Perkin-Elmer.

        In life sciences instrumentation, including molecular interaction,
    MALDI-TOF mass spectrometry, DNA amplification, and capillary
    electrophoresis, Thermo BioAnalysis competes primarily on the basis of
    technological innovation, performance, flexibility, and price. Major
    competitors in this category include Perkin-Elmer and PerSeptive
    Biosystems, Inc., which is now a subsidiary of Perkin-Elmer. In
    information management systems, Thermo BioAnalysis competes in the
    high-end LIMS and CDS markets primarily on function, flexibility,
    technical sophistication, customization, and price. Major competitors
    include Hewlett-Packard, Perkin-Elmer, and Waters.

        Metrika Systems competes primarily on the basis of performance and,
    to a lesser extent, price in the on-line coal, cement, and mineral
    analysis markets. Scantech Limited is the Company's primary competitor in
    the on-line coal and cement analysis market. Amdel of Australia is the
    Company's principal competitor in the on-line minerals analysis market.
    The market for solids and multiphase analyzers for process control is
    generally fragmented. Competition in the thickness-gauging business is
    highly fragmented with numerous competitors competing in various end-use
    market segments. As a result, competition varies according to the end-use
    segment. Metrika Systems competes primarily on the basis of quality,
    performance, and price.

        Thermo Vision competes primarily on the basis of technical
    suitability, product performance, reliability, and price, and its
    principal competitors include Melles-Griot, Inc.; Optical Coating
    Laboratory, Inc.; Newport Corporation; Coherent, Inc.; Corning OCA
    Corporation; the Bicron Business Unit of Saint-Gobain Industrial Ceramics,
    Inc.; UDT Sensors, Inc.; and Hamamatsu Corporation, a unit of Hamamatsu
    Photonics KK.

        The Company competes in the field measurement instruments and sensors
    market primarily on quality and reliability, technical features,
    accuracy, ease of use, price, and reputation for after market service.
    The field measurement instruments and sensors market segment of the
    process control market is highly fragmented and intensely competitive,
    and the Company expects competition to continue to increase. ONIX Systems
    competes with a few large competitors, including Fisher-Rosemount, a
    division of Emerson Electric Co., Inc.; Elsag-Bailey Process Automation
    N.V., affiliates of ABB Asea Brown Boveri (Holding) Ltd.; and Yokogawa,
    in each of its product areas and with many companies within specific

                                        7PAGE
<PAGE>
    industries. As the technologies utilized within the process measurement
    industry continue to develop, ONIX Systems expects to face increasing
    competition from emerging competitors.

        The Company is a leading manufacturer of ambient air-monitoring
    instruments and a major manufacturer of source monitoring and
    worker-safety monitoring instruments. The Company competes in these
    markets on the basis of technical performance and reliability, as well as
    customer service. The Company's principal competitors include Monitor
    Labs Incorporated, Advanced Pollution Instruments, and Mine Safety
    Appliances Co.

        The Company has a relatively small presence within the large and
    varied process-control marketplace, which is extremely fragmented and is
    comprised of several large companies, including Fisher-Rosemount, Elsag
    Bailey, and Honeywell Process Control, as well as numerous smaller
    companies. The Company competes in this market primarily on the basis of
    technical performance, customer service, and reliability.

        Environmental Protection Regulations

        The Company believes that compliance by the Company with federal,
    state, and local environmental protection regulations will not have a
    material adverse effect on its capital expenditures, earnings, or
    competitive position.

        Number of Employees

        As of January 3, 1998, the Company employed 9,398 people.

    (d) Financial Information About Exports by Domestic Operations and
        --------------------------------------------------------------
        About Foreign Operations.
        ------------------------

        Financial information about exports by domestic operations and about
    foreign operations is summarized in Note 14 to Consolidated Financial
    Statements in the Registrant's 1997 Annual Report to Shareholders and is
    incorporated herein by reference.

    (e) Executive Officers of the Registrant.
        ------------------------------------
                                            Present Title (Year First Became
        Name                         Age    Executive Officer)
        -------------------------    ---    --------------------------------
        Earl R. Lewis                 54    President and Chief Executive
                                              Officer (1990)
        Denis A. Helm                 59    Senior Vice President (1986)
        Dr. Richard W.K. Chapman      53    Vice President (1994)
        Barry S. Howe                 42    Vice President (1994)
        John N. Hatsopoulos *         63    Chief Financial Officer and 
                                              Senior Vice President (1988)
        Paul F. Kelleher              55    Chief Accounting Officer (1986)

        *John N. Hatsopoulos and George N. Hatsopoulos, a director of the
         Company, are brothers.

                                        8PAGE
<PAGE>
        Each executive officer serves until his successor is chosen or
    appointed by the Board of Directors and qualified or until earlier
    resignation, death, or removal. All executive officers, except Mr. Lewis
    and Dr. Chapman, have held comparable positions for at least five years,
    either with the Company or with its parent company, Thermo Electron. Mr.
    Lewis was named President and Chief Executive Officer of the Company in
    March 1997. Mr. Lewis served as Executive Vice President and Chief
    Operating Officer of the Company from January 1996 through March 1997, as
    a Senior Vice President from January 1994 through January 1996, and as a
    Vice President from March 1990 through January 1994. Dr. Chapman has been
    President and Chief Executive Officer of ThermoQuest since its inception
    in June 1995, and served as President of Finnigan Corporation, a
    subsidiary of ThermoQuest, from 1992 to 1995. Messrs. Lewis, Helm,
    Chapman, and Howe are full-time employees of the Company. Messrs.
    Hatsopoulos and Kelleher are full-time employees of Thermo Electron and
    certain of its subsidiaries, but devote such time to the affairs of the
    Company as the Company's needs reasonably require.

    Item 2. Properties
            ----------

        The Company owns approximately 2,601,000 square feet of office,
    engineering, laboratory, and production space, principally in California,
    Florida, New Mexico, Texas, Wisconsin, Ohio, New Hampshire, New York,
    Massachusetts, the United Kingdom, and Germany, and leases approximately
    2,423,000 square feet of office, engineering, laboratory, and production
    space, under leases expiring from 1998 through 2017, principally in
    California, Massachusetts, Texas, Wisconsin, and the United Kingdom. As
    of January 3, 1998, the Company had an $8.3 million mortgage loan that is
    secured by 200,000 square feet of property in California with a net book
    value of $15.8 million.

        The Company believes that its facilities are in good condition and
    are suitable and adequate for its present operations and that suitable
    space is readily available if any of such leases are not extended. With
    respect to leases expiring in the near future, in the event the Company
    does not renew such leases, the Company believes suitable alternate space
    is available for lease on acceptable terms.

    Item 3. Legal Proceedings
            -----------------

        Not applicable.

    Item 4. Submission of Matters to a Vote of Security Holders
            ---------------------------------------------------

        Not applicable.



                                        9PAGE
<PAGE>
                                     PART II

    Item 5. Market for Registrant's Common Equity and Related Stockholder
            -------------------------------------------------------------
            Matters
            -------

        Information concerning the market and market price for the
    Registrant's common stock, $.10 par value, and dividend policy is
    included under the sections labeled "Common Stock Market Information" and
    "Dividend Policy" in the Registrant's 1997 Annual Report to Shareholders
    and is incorporated herein by reference.

    Item 6. Selected Financial Data
            -----------------------

        The information required under this item is included under the
    sections labeled "Selected Financial Information" and "Dividend Policy"
    in the Registrant's 1997 Annual Report to Shareholders and is
    incorporated herein by reference.

    Item 7. Management's Discussion and Analysis of Financial Condition and
            ---------------------------------------------------------------
            Results of Operations
            ---------------------

        The information required under this item is included under the
    heading "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" in the Registrant's 1997 Annual Report to
    Shareholders and is incorporated herein by reference.

    Item 8. Financial Statements and Supplementary Data
            -------------------------------------------

        The Registrant's Consolidated Financial Statements as of January 3,
    1998, and Supplementary Data are included in the Registrant's 1997 Annual
    Report to Shareholders and are incorporated herein by reference.

    Item 9. Changes in and Disagreements with Accountants on Accounting and
            ---------------------------------------------------------------
            Financial Disclosure
            --------------------

        Not applicable.




                                       10PAGE
<PAGE>
                                    PART III

    Item 10. Directors and Executive Officers of the Registrant
             --------------------------------------------------

        The information concerning directors required under this item is
    incorporated herein by reference from the material contained under the
    caption "Election of Directors" in the Registrant's definitive proxy
    statement to be filed with the Securities and Exchange Commission
    pursuant to Regulation 14A, not later than 120 days after the close of
    the fiscal year. The information concerning delinquent filers pursuant to
    Item 405 of Regulation S-K is incorporated herein by reference from the
    material contained under the heading "Section 16(a) Beneficial Ownership
    Reporting Compliance" under the caption "Stock Ownership" in the
    Registrant's definitive proxy statement to be filed with the Securities
    and Exchange Commission pursuant to Regulation 14A, not later than 120
    days after the close of the fiscal year.

    Item 11. Executive Compensation
             ----------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Executive
    Compensation" in the Registrant's definitive proxy statement to be filed
    with the Securities and Exchange Commission pursuant to Regulation 14A,
    not later than 120 days after the close of the fiscal year.

    Item 12. Security Ownership of Certain Beneficial Owners and Management
             --------------------------------------------------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Stock Ownership"
    in the Registrant's definitive proxy statement to be filed with the
    Securities and Exchange Commission pursuant to Regulation 14A, not later
    than 120 days after the close of the fiscal year.

    Item 13. Certain Relationships and Related Transactions
             ----------------------------------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Relationship
    with Affiliates" in the Registrant's definitive proxy statement to be
    filed with the Securities and Exchange Commission pursuant to Regulation
    14A, not later than 120 days after the close of the fiscal year.










                                       11PAGE
<PAGE>
                                     PART IV

    Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K
             ----------------------------------------------------------------

      (a, d) Financial Statements and Schedules.
             ----------------------------------

             (1) The consolidated financial statements set forth in the list
                 below are filed as part of this Report.

             (2) The consolidated financial statement schedule set forth in
                 the list below is filed as part of this Report.

             (3) Exhibits filed herewith or incorporated herein by reference
                 are set forth in Item 14(c) below.

             List of Financial Statements and Schedules Referenced in this
             -------------------------------------------------------------
             Item 14.
             --------

             Information incorporated by reference from Exhibit 13 filed
             herewith:

                 Consolidated Statement of Income
                 Consolidated Balance Sheet
                 Consolidated Statement of Cash Flows
                 Consolidated Statement of Shareholders' Investment
                 Notes to Consolidated Financial Statements
                 Report of Independent Public Accountants

             Financial Statement Schedules filed herewith:

                 Schedule II: Valuation and Qualifying Accounts

             All other schedules are omitted because they are not applicable
             or not required, or because the required information is shown
             either in the financial statements or in the notes thereto.

         (b) Reports on Form 8-K.
             -------------------

             None.

         (c) Exhibits.
             --------

             See Exhibit Index on the page immediately preceding exhibits.




                                       12PAGE
<PAGE>
                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
    Exchange Act of 1934, the Registrant has duly caused this report to be
    signed on its behalf by the undersigned, thereunto duly authorized.

    Date: March 11, 1998           THERMO INSTRUMENT SYSTEMS INC.


                                   By: Earl R. Lewis
                                       -----------------------------------
                                       Earl R. Lewis
                                       President and Chief Executive
                                         Officer

        Pursuant to the requirements of the Securities Exchange Act of 1934,
    this report has been signed below by the following persons on behalf of
    the Registrant and in the capacities indicated, as of March 11, 1998.

    Signature                          Title
    ---------                          -----


    By: Earl R. Lewis                 President, Chief Executive Officer,
        ---------------------------    and Director
        Earl R. Lewis                    

    By: John N. Hatsopoulos            Chief Financial Officer,
        ---------------------------      Senior Vice President, and Director
        John N. Hatsopoulos        

    By: Paul F. Kelleher               Chief Accounting Officer
        ---------------------------
        Paul F. Kelleher

    By:                                Director
        ---------------------------
        Frank Borman

    By: George N. Hatsopoulos          Director
        ---------------------------
        George N. Hatsopoulos

    By: Arvin H. Smith                 Chairman of the Board and Director
        ---------------------------
        Arvin H. Smith

    By: Polyvios C. Vintiadis          Director
        ---------------------------
        Polyvios C. Vintiadis




                                       13PAGE
<PAGE>
                    Report of Independent Public Accountants
                    ----------------------------------------

    To the Shareholders and Board of Directors of
    Thermo Instrument Systems Inc.:

        We have audited, in accordance with generally accepted auditing
    standards, the consolidated financial statements included in Thermo
    Instrument Systems Inc.'s Annual Report to Shareholders incorporated by
    reference in this Form 10-K, and have issued our report thereon dated
    February 17, 1998. Our audits were made for the purpose of forming an
    opinion on those statements taken as a whole. The schedule listed in Item
    14 on page 12 is the responsibility of the Company's management and is
    presented for purposes of complying with the Securities and Exchange
    Commission's rules and is not part of the basic consolidated financial
    statements. This schedule has been subjected to the auditing procedures
    applied in the audits of the basic consolidated financial statements and,
    in our opinion, fairly states, in all material respects, the financial
    data required to be set forth therein in relation to the basic
    consolidated financial statements taken as a whole.



                                                 Arthur Andersen LLP



    Boston, Massachusetts
    February 17, 1998











                                       14PAGE
<PAGE>
  SCHEDULE II

                         THERMO INSTRUMENT SYSTEMS INC.
                        Valuation and Qualifying Accounts
                                 (In thousands)


                            Provision
                Balance at    Charged             Accounts            Balance
                 Beginning         to   Accounts   Written             at End
  Description      of Year    Expense  Recovered       Off  Other(a)  of Year
  ---------------------------------------------------------------------------
  Allowance for
    Doubtful Accounts

  Year Ended
   Jan. 3, 1998    $16,981    $ 4,366     $  304   $(4,375)  $5,510   $22,786

  Year Ended
   Dec. 28, 1996   $12,569    $ 2,274     $   69   $(5,015)  $7,084   $16,981

  Year Ended
   Dec. 30, 1995   $ 8,779    $ 2,543     $  191   $(2,942)  $3,998   $12,569

  (a) Includes allowance of businesses acquired during the year as described
      in Note 4 to Consolidated Financial Statements in the Company's 1997
      Annual Report to Shareholders and the effect of foreign currency
      translation.









                                       15PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
      2.1          Asset and Stock Purchase Agreement among the
                   Registrant, Thermo Electron Corporation, and Fisons
                   plc dated March 1, 1995, as amended (filed as
                   Exhibit 2.3 to the Registrant's Annual Report on
                   Form 10-K for the fiscal year ended December 31,
                   1994, and as Exhibit 2 to the Registrant's Quarterly
                   Report on Form 10-Q for the quarter ended September
                   30, 1995 [File No. 1-9786] and incorporated herein
                   by reference). Pursuant to Item 601(b)(2) of
                   Regulation S-K, schedules to this Agreement have
                   been omitted. The Company hereby undertakes to
                   furnish supplementally a copy of such schedules to
                   the Commission upon request.

      2.2          Agreement and Release dated as of December 15, 1997,
                   among Fisons plc, the Registrant and Thermo Electron.

      3.1          Amendment to Restated Certificate of Incorporation
                   of the Registrant (filed as Exhibit 3.1 to the
                   Registrant's Quarterly Report on Form 10-Q for the
                   quarter ended June 29, 1996 [File No. 1-9786] and
                   incorporated herein by reference).

      3.2          By-Laws of the Registrant (filed as Exhibit 3(b) to
                   the Registrant's Annual Report on Form 10-K for the
                   fiscal year ended January 2, 1993 [File No. 1-9786]
                   and incorporated herein by reference).

      4.1          Subordinated Indenture, dated January 15, 1998,
                   among the Registrant, Thermo Electron and Bankers
                   Trust Company as trustee, relating to $250,000,000
                   principal amount of 4% Convertible Subordinated
                   Debentures due 2005 (filed as Exhibit 4.1 to the
                   Registrant's Current Report on Form 8-K filed with
                   the Commission on January 16, 1998, and incorporated
                   herein by reference).

      4.2          Senior convertible note purchase agreement by and
                   between the Registrant and Thermo Electron as of
                   September 15, 1993 (filed as Exhibit 10(a) to the
                   Registrant's Quarterly Report on Form 10-Q for the
                   quarter ended October 2, 1993 [File No. 1-9786] and
                   incorporated by reference).

                   The Registrant hereby agrees, pursuant to Item
                   601(b) (4) (iii) (A) of Regulation S-K, to furnish
                   to the Commission upon request, a copy of each
                   instrument with respect to other long-term debt of
                   the Registrant or its subsidiaries.


                                       16PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
     10.1          Amended and Restated Corporate Services Agreement,
                   dated as of January 3, 1993, between Thermo Electron
                   and the Registrant (filed as Exhibit 10(a) to the
                   Registrant's Annual Report on Form 10-K for the
                   fiscal year ended January 2, 1993 [File No. 1-9786]
                   and incorporated herein by reference).

     10.2          Tax Allocation Agreement dated as of May 29, 1986,
                   between Thermo Electron and the Registrant (filed as
                   Exhibit 10(b) to the Registrant's Registration
                   Statement on Form S-1 [Reg. No. 33-6762] and
                   incorporated herein by reference).

     10.3          Thermo Electron Corporate Charter, as amended and
                   restated effective January 3, 1993 (filed as Exhibit
                   10(f) to the Registrant's Annual Report on Form 10-K
                   for the fiscal year ended January 2, 1993 [File No.
                   1-9786] and incorporated herein by reference).

     10.4          Form of Indemnification Agreement with Directors and
                   Officers (filed as Exhibit 10(g) to the Registrant's
                   Annual Report on Form 10-K for the fiscal year ended
                   December 29, 1990 [File No. 1-9786] and incorporated
                   herein by reference).

     10.5          Plan for sale of shares by the Registrant to Thermo
                   Electron (filed as Exhibit 10(dd) to the
                   Registrant's Quarterly Report on Form 10-Q for the
                   quarter ended July 3, 1993 [File No. 1-9786] and
                   incorporated herein by reference).

     10.6          Master Repurchase Agreement dated December 28, 1996,
                   between the Registrant and Thermo Electron (filed as
                   Exhibit 10.6 to the Registrant's Annual Report on
                   Form 10-K for the fiscal year ended December 28,
                   1996 [File No. 1-9786] and incorporated herein by
                   reference).

     10.7          Amended and Restated Master Guarantee Reimbursement
                   and Loan Agreement dated December 2, 1997, by and
                   among the Registrant and Thermo Electron.

     10.8          $30,000,000 Promissory Note dated as of February 13,
                   1996, issued by Thermo BioAnalysis Corporation to
                   Thermo Electron (filed as Exhibit 10.1 to the
                   Registrant's Quarterly Report on Form 10-Q for the
                   quarter ended March 30, 1996 [File No. 1-9786] and
                   incorporated herein by reference).


                                       17PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
     10.9          $65,000,000 Promissory Note dated as of April 12,
                   1996, issued by the Registrant to Thermo Electron
                   (filed as Exhibit 10.2 to the Registrant's Quarterly
                   Report on Form 10-Q for the quarter ended March 30,
                   1996 [File No. 1-9786] and incorporated herein by
                   reference).

     10.10         Restated Stock Holdings Assistance Plan and Form of
                   Promissory Note.

     10.11-10.15   Reserved.

     10.16         Deferred Compensation Plan for Directors of the
                   Registrant (filed as Exhibit 10(f) to the
                   Registrant's Registration Statement on Form S-1
                   [Reg. No. 33-6762] and incorporated herein by
                   reference).

     10.17         Directors' Stock Option Plan of the Registrant
                   (filed as Exhibit 10.17 to the Registrant's Annual
                   Report on Form 10-K for the fiscal year ended
                   December 31, 1994 [File No. 1-9786] and incorporated
                   herein by reference).

     10.18         Incentive Stock Option Plan of the Registrant (filed
                   as Exhibit 10(c) to the Registrant's Registration
                   Statement on Form S-1 [Reg. No. 33-6762] and
                   incorporated herein by reference). (Maximum number
                   of shares issuable in the aggregate under this plan
                   and the Registrant's Nonqualified Stock Option Plan
                   is 3,515,625 shares, after adjustment to reflect
                   share increase approved in 1990; 3-for-2 stock
                   splits effected in January 1988, July 1993, and
                   April 1995; and 5-for-4 stock splits effected in
                   December 1995 and October 1997).

     10.19         Nonqualified Stock Option Plan of the Registrant
                   (filed as Exhibit 10(d) to the Registrant's
                   Registration Statement on Form S-1 [Reg. No.
                   33-6762] and incorporated herein by reference).
                   (Maximum number of shares issuable in the aggregate
                   under this plan and the Registrant's Incentive Stock
                   Option Plan is 3,515,625 shares, after adjustment to
                   reflect share increase approved in 1990; 3-for-2
                   stock splits effected in January 1988, July 1993,
                   and April 1995; and 5-for-4 stock splits effected in
                   December 1995 and October 1997).



                                       18PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
     10.20         Equity Incentive Plan of the Registrant (filed as
                   Appendix A to the Proxy Statement dated April 27,
                   1993, of the Registrant [File No. 1-9786] and
                   incorporated herein by reference). (Maximum number
                   of shares issuable is 5,039,062 shares, after
                   adjustment to reflect share increase approved in
                   December 1993; 3-for-2 stock splits effected in July
                   1993 and April 1995; and 5-for-4 stock splits
                   effected in December 1995 and October 1997).

     10.21         Finnigan Corporation 1979 Long-term Incentive Stock
                   Option Plan (filed as Exhibit 10.21 to the
                   Registrant's Annual Report on Form 10-K for the
                   fiscal year ended December 31, 1994 [File No.
                   1-9786] and incorporated herein by reference).

     10.22         Former Thermo Environmental Corporation Incentive
                   Stock Option Plan (filed as Exhibit 10(d) to Thermo
                   Environmental's Registration Statement on Form S-1
                   [Reg. No. 33-329] and incorporated herein by
                   reference). (Maximum number of shares issuable in
                   the aggregate under this plan and the Former Thermo
                   Environmental Corporation Nonqualified Stock Option
                   Plan is 1,450,195 shares, after adjustment to
                   reflect share increase approved in 1987; 3-for-2
                   stock splits effected in July 1993 and April 1995;
                   and 5-for-4 stock splits effected in December 1995
                   and October 1997).

     10.23         Former Thermo Environmental Corporation Nonqualified
                   Stock Option Plan (filed as Exhibit 10(e) to Thermo
                   Environmental's Registration Statement on Form S-1
                   [Reg. No. 33-329] and incorporated herein by
                   reference). (Maximum number of shares issuable in
                   the aggregate under this plan and the Former Thermo
                   Environmental Corporation Incentive Stock Option
                   Plan is 1,450,195 shares, after adjustment to
                   reflect share increase approved in 1987; 3-for-2
                   stock splits effected in July 1993 and April 1995;
                   and 5-for-4 stock splits effected in December 1995
                   and October 1997).

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


                                       19PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
     10.25         Thermo Instrument Systems Inc. - ThermoQuest
                   Corporation Nonqualified Stock Option Plan (filed as
                   Exhibit 10.65 to Thermo Cardiosystems' Annual Report
                   on Form 10-K for the fiscal year ended December 30,
                   1995 [File No. 1-10114] and incorporated herein by
                   reference).

     10.26         Thermo Instrument Systems Inc. - Thermo BioAnalysis
                   Corporation Nonqualified Stock Option Plan (filed as
                   Exhibit 10.64 to Thermo Cardiosystems' Annual Report
                   on Form 10-K for the fiscal year ended December 30,
                   1995 [File No. 1-10114] and incorporated herein by
                   reference).

     10.27         Thermo Instrument Systems Inc. - Thermo Optek
                   Corporation Nonqualified Stock Option Plan (filed as
                   Exhibit 10.27 to the Registrant's Annual Report on
                   Form 10-K for the fiscal year ended December 28,
                   1996 [File No. 1-9786] and incorporated herein by
                   reference).

     10.28         Thermo Instrument Systems Inc. - Metrika Systems
                   Corporation Nonqualified Stock Option Plan.

     10.29         Thermo Instrument Systems Inc. - Thermo Vision
                   Corporation Nonqualified Stock Option Plan.

     10.30         Thermo Instrument Systems Inc. - ONIX Systems Inc.
                   Nonqualified Stock Option Plan.

                   In addition to the stock-based compensation plans of
                   the Registrant, the executive officers of the
                   Registrant may be granted awards under stock-based
                   compensation plans of Thermo Electron for services
                   rendered to the Registrant. The terms of such plans
                   are substantially the same as those of the
                   Registrant's Equity Incentive Plan.

     10.31         $210,000,000 Promissory Note dated as of March 27,
                   1997, issued by the Registrant to Thermo Electron
                   (filed as Exhibit 10.1 to the Registrant's Quarterly
                   Report on Form 10-Q for the quarter ended March 29,
                   1997, and incorporated herein by reference).

     10.32         $115,000,000 Promissory Note dated as of June 24,
                   1997, issued by the Registrant to Thermo Electron
                   (filed as Exhibit 10.1 to the Registrant's Quarterly
                   Report on Form 10-Q for the quarter ended June 28,
                   1997, and incorporated herein by reference).


                                       20PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
     10.33         $3,800,000 Promissory Note dated as of July 14,
                   1997, issued by Thermo Vision to Thermo Electron
                   (filed as Exhibit 10 to Thermo Optek's Quarterly
                   Report on Form 10-Q for the quarter ended September
                   27, 1997, and incorporated herein by reference).

     10.34         $45,000,000 Promissory Note dated as of September
                   12, 1997, issued by ThermoSpectra to Thermo Electron
                   (filed as Exhibit 10 to ThermoSpectra's Quarterly
                   Report on Form 10-Q for the quarter ended September
                   27, 1997, and incorporated herein by reference).

     10.35         Amended and Restated Master Guarantee Reimbursement
                   and Loan Agreement dated as of December 5, 1997,
                   between Thermo Optek and Thermo Electron.

     10.36         Amended and Restated Master Guarantee Reimbursement and
                   Loan Agreement dated as of December 3, 1997, between
                   ThermoQuest and Thermo Electron.

     10.37         Amended and Restated Master Guarantee Reimbursement and
                   Loan Agreement dated as of December 3, 1997, between
                   Metrika Systems and Thermo Electron.

     10.38         Master Guarantee Reimbursement and Loan Agreement dated as
                   of November 14, 1997, between Thermo Vision and Thermo
                   Electron.

     10.39         Amended and Restated Master Guarantee Reimbursement and
                   Loan Agreement dated as of December 2, 1997, between
                   Thermo BioAnalysis and Thermo Electron.

     10.40         Amended and Restated Master Guarantee Reimbursement and
                   Loan Agreement dated as of December 4, 1997, between
                   ThermoSpectra and Thermo Electron.

     10.41         Amended and Restated Master Guarantee Reimbursement
                   and Loan Agreement dated as of January 5, 1998,
                   between ONIX Systems and Thermo Electron (filed as
                   Exhibit 10.5 to the Registration Statement of ONIX
                   Systems on Form S-1 [Reg. No. 333-45333] and
                   incorporated herein by reference).

     13            Annual Report to Shareholders for the year ended
                   January 3, 1998 (only those portions incorporated
                   herein by reference).

     21            Subsidiaries of the Registrant.

     23            Consent of Arthur Andersen LLP.

                                       21PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number         Description of Exhibit
    ------------------------------------------------------------------------
     27.1          Financial Data Schedule for the year ended January 3,
                   1998.

     27.2          Financial Data Schedule for the year ended December 28,
                   1996 (restated for the adoption of SFAS No. 128).

     27.3          Financial Data Schedule for the quarter ended March 29,
                   1997 (restated for the adoption of SFAS No. 128).

     27.4          Financial Data Schedule for the quarter ended June 28,
                   1997 (restated for the adoption of SFAS No. 128).

     27.5          Financial Data Schedule for the quarter ended
                   September 27, 1997 (restated for the adoption of
                   SFAS No. 128).



                                                EXHIBIT 2.2


                                AGREEMENT AND RELEASE

                  This Agreement and Release, entered into as of the 15th
        day of December, 1997, by and between Fisons plc, an English
        company ("Fisons"), on the one hand, and Thermo Instrument
        Systems Inc., a Delaware corporation ("Thermo"), and Thermo
        Electron Corporation, a Delaware corporation ("Thermo Electron"),
        on the other hand (all of whom are sometimes referred to as
        "parties").

                                       RECITALS


        A.   The parties hereto have previously entered into an Amended
        and Restated Asset and Stock Purchase Agreement (the
        "Agreement"), dated as of March 29, 1996, pursuant to which
        Fisons sold a portion of its scientific instruments business to
        Thermo.

        B.   Pursuant to Section 4.1 of the Agreement, which provides for
        a possible post-closing adjustment to the purchase price, Fisons
        in 1996 delivered to Thermo a draft closing balance sheet with
        respect to the business sold.  Thereafter, Thermo asserted
        certain objections and other claims with respect to that draft
        closing balance sheet, which it claimed entitled it to a
        reduction in the purchase price, plus interest thereon.
        Subsequently, Thermo made certain other claims with respect to
        the resale to Fisons pursuant to Section 7.16 of the Agreement of
        certain accounts receivable.  All such objections and claims are
        referred to herein as the "Asserted Claims".

        C.   The parties desire to resolve the Asserted Claims amicably,
        without any admission of liability, on the terms and conditions
        set forth herein.

                                    AGREEMENT

             NOW, THEREFORE, Fisons, Thermo and Thermo Electron, in
        consideration of the foregoing and the mutual promises and
        obligations contained herein, and intending to be legally bound
        hereby, covenant and agree as follows:


                  1.   In consideration of the terms hereof, the releases
        granted hereby and the other covenants herein, Fisons shall pay
        to Thermo the sum of TWENTY-FOUR MILLION FOUR HUNDRED FIFTY-SIX
        THOUSAND SEVEN HUNDRED EIGHTY-THREE British Pounds Sterling
        (BPS24,456,783) (collectively, the "Settlement Funds"), as set
        forth below by wire transfer to the following bank and account
        number:
PAGE
<PAGE>
             Barclays Bank Plc

             London England


             Sort Code 20-00-00

             For: Thermo Instrument Systems Inc.

             Account Number xxxxxxxx

             Attention: North American Team

             The Settlement Funds are compromised of the following
        constituent amounts:


                  (a)  2,475,000 British Pounds Sterling, in respect of
        Claims (as defined below) relating to the matters provided for in
        Section 7.16 of the Agreement;

                  (b)  19,650,000 British Pounds Sterling, in respect of
        all other Claims (as defined below) released hereunder;

                  (c)  2,331,783 British Pounds Sterling, representing
        interest on the amount provided for in subparagraph (b) above.

             Fisons shall pay the Settlement Funds in full on January 2,
        1998.  The effectiveness of this Agreement and Release is
        conditioned upon Thermo's receipt of the Settlement Funds.

             2.   2.1  In consideration of the delivery of the Settlement
        Funds as set forth above in paragraph 1, each of Thermo and
        Thermo Electron does, for and on behalf of itself as well as all
        persons claiming by, through or under it (including without
        limitation all past, present and future parents, predecessors,
        successors, subsidiaries, affiliates and assigns, their
        respective past, present and future directors, officers,
        employees, agents, attorneys and insurers, and administrators
        thereof) (individually and collectively, "Releasors"), hereby
        irrevocably and unconditionally acknowledges complete
        satisfaction of, and does hereby remise, release and forever
        discharge Fisons, its past, present and future parents,
        predecessors, successors, subsidiaries, affiliates and assigns,
        their respective past, present and future directors, officers,
        shareholders, employees, agents, attorneys and insurers, and
        administrators thereof (including without limitation
        Rhone-Poulenc Rorer Inc.) (individually and collectively,
        "Releasees") of and from, any and all claims, demands, causes of
        action, suits, debts, sums of money, accounts, covenants,
        contracts, controversies, agreements, promises, damages and

                                          2PAGE
<PAGE>
        judgments ("Claims") of any kind or nature whatsoever, in law or
        in equity, known or unknown, existing or contingent, suspected or
        unsuspected, within this or any jurisdiction, that it ever had or
        may have had or may now or hereafter have, arising from or
        relating to:

                  (a)  any matter provided for in any one or more of the
                  following Sections of the Agreement:

                       (i)  Section 3.2(b) insofar as it relates to any
                       liability for a warranty obligation released under
                       paragraph 2.1(a)(iii) of this Agreement and
                       Release or any liability for a product liability
                       claim released under paragraph 2.1(a)(ii) of this
                       Agreement and Release (and, for the avoidance of
                       doubt, the release under this paragraph 2.1(a)(i)
                       of this Agreement and Release shall not affect any
                       Claim under such Section 3.2 (b) with respect to
                       the lawsuit Biacore, AB and Biacore, Inc. v.
                       Thermo Bioanalysis Corporation, U.S.D.C., D. Del,
                       No. 97-274);


                       (ii) Section 3.2(f) insofar as it relates to any
                       liability for a product liability claim asserted
                       on or prior to the date hereof with respect to an
                       occurrence after the Closing (as defined in the
                       Agreement);

                       (iii)     Section 3.2(j), except for any Claim
                       under Section 3.2(j) with respect to the lawsuit
                       The Purdue Frederick Company v. Fisons
                       Instruments, Inc., and VG Laboratory Systems
                       Limited, U.S.D.C., S.D.N.Y. No. 97 CV-0898;

                       (iv) Section 4.1;

                       (v)  Section 5, except for the representations and
                       warranties set forth therein that are identified
                       in Section 11.3(c)(i) of the Agreement as
                       surviving without time limit;

                       (vi) Section 7.16;


                       (vii)     Section 11.1(a) insofar as it relates to
                       representations and warranties with respect to
                       which Claims are released hereunder;

                       (viii)    Section 11.1(b) insofar as it relates to
                       covenants or agreements with respect to which
                       Claims are released hereunder;

                                          3PAGE
<PAGE>
                       (ix) Section 11.1(c) insofar as it relates to
                       Excluded Liabilities (as defined in the Agreement)
                       with respect to which Claims are released
                       hereunder;

                       (x)  Section 11.1(d) insofar as it relates to
                       Excluded Company Liabilities (as defined in the
                       Agreement) corresponding to the Excluded
                       Liabilities with respect to which Claims are
                       released hereunder; and

                       (xi) all other Sections or portions thereof of the
                       Agreement, except for the Sections and matters set
                       forth below in paragraph 2.2 of this Agreement and
                       Release; provided, however, that each Claim (other
                       than an Asserted Claim or any Claim for a matter
                       that is known to any Releasor as of the date
                       hereof) arising from or relating to any matter
                       provided for in any such other Sections of the
                       Agreement shall be excluded from the release under
                       this paragraph 2.1(a)(xi) to the extent the Losses
                       (as defined in the Agreement) incurred or suffered
                       by Thermo as a result of such Claim exceed ONE
                       MILLION UNITED STATES DOLLARS (US $1,000,000); and
                       provided further that in determining whether such
                       threshold has been exceeded all Claims arising out
                       of separate occurrences shall be treated as
                       separate Claims except that Claims arising out of
                       the same or similar circumstances or the same text
                       of the Agreement shall be treated as a single
                       Claim; and/or


                  (b)  the Asserted Claims and/or the subject matter
        thereof.

                  2.2  The release under paragraph 2.1(a)(xi) of this
        Agreement and Release shall not extend to any one or more of the
        following Sections of the Agreement:

                  (a)  Sections 2.7; 2.8; 2.9; 3.2(a), (c), (d), (e),
                  (g), (h), (i), (k), (l), (m), and (n); 4.2; 4.3; 7.6;
                  7.7(a), (b) and (c); 7.8; 7.9; 7.10(b); 7.12; 7.13;
                  7.14; 7.15; 7.17; 7.19; 7.21; 7.23; 7.24; 11.1(e),( f),
                  (g) and (h); 11.3; 11.4; and 13;

                  (b)  Sections 3.2(b), (f) and (j) insofar as they are
                  excluded from the release under paragraphs 2.1(a)(i),
                  (ii) or (iii) of this Agreement and Release; and

                  (c)  Sections 11.1(a), (b), (c) and (d) insofar as they
                  relate to Claims that are excluded from the release


                                          4PAGE
<PAGE>
                  hereunder pursuant to paragraph 2.1(a)(xi), 2.2(a) or
                  2.2(b) of this Agreement and Release.

             3.   Each of Thermo and Thermo Electron understands and
        acknowledges that it is possible that unknown losses or claims
        exist or that the Asserted Claims may have been underestimated in
        amount or severity, and the parties explicitly took that into
        account in determining to enter into this Agreement and Release,
        and nonetheless bargained, with the knowledge of the possibility
        of such unknown claims to provide for a full accord, satisfaction
        and discharge of all such claims that are within the scope of the
        release provided hereunder.  Consequently, each of Thermo and
        Thermo Electron expressly waives all rights under California
        Civil Code Section 1542, or any similar provision law.  Section
        1542 provides that:

                  " A general release does not extend to claims which the
                  creditor does not know or suspect to exist in his favor
                  at the time of executing the release, which if known by
                  him must have materially affected his settlement with
                  the debtor."


             4.   Each of Thermo and Thermo Electron represents, warrants
        and covenants that there are not now pending and that it will not
        hereafter under any circumstances commence or prosecute any suit,
        action or proceeding or assert any claim against any of the
        Releasees with respect to any Claim released hereunder.

             5.   Each of Thermo and Thermo Electron represents and
        warrants that:

                  (a)  it has not heretofore assigned or transferred or
                  purported to assign or transfer to any person or entity
                  any Claim (or portion thereof or interest therein)
                  released hereunder, and it shall indemnify, defend and
                  hold the Releasees harmless from and against any and
                  all claims based on or arising out of any such
                  assignment or transfer, or purported assignment or
                  transfer, of any such Claim or any portion thereof or
                  interest therein;

                  (b)  it has not been induced to execute this Agreement
                  and Release by any warranty, representation, promise,
                  covenant or agreement made by or on behalf of Releasees
                  or any other person or entity, other than the payment
                  of the Settlement Funds as described in paragraph 1
                  hereof;

                  (c)  it has carefully read and understood the scope and
                  effect of every provision of the Agreement and Release,
                  it has consulted with counsel of its choice who has
                  fully and completely explained to it the terms and

                                          5PAGE
<PAGE>
                  provisions of this Agreement and Release and it has
                  executed this Agreement and Release voluntarily and
                  intending to be legally bound hereby;

                  (d)  it has full power and authority to execute and
                  deliver this Agreement and Release and to perform its
                  obligations hereunder in accordance with their terms;

                  (e)  the execution and delivery of this Agreement and
                  Release, and the performance by it of its obligations
                  hereunder, have been duly authorized by all necessary
                  corporate actions on its part;


                  (f)  this Agreement and Release constitutes its legal,
                  valid and binding obligation, enforceable against it in
                  accordance with the terms hereof.

             6.   This Agreement and Release constitutes a full and
        complete compromise and settlement of all Claims released
        hereunder.  In addition, Fisons acknowledges and agrees that this
        Agreement and Release constitutes a full and complete compromise
        and settlement of (i) the adjustments under Section 4.1 of the
        Agreement based on the Draft Closing Balance Sheet and the
        Closing Balance Sheet (as those terms are defined in the
        Agreement); and (ii) all of Fisons' rights and Thermo's
        obligations under Section 7.16 of the Agreement.

             7.   Each of Thermo and Thermo Electron acknowledges that
        this Agreement and Release, the settlement reflected herein and
        the payment made pursuant hereto are the result of the compromise
        resolution of disputed claims and shall never be offered or
        construed as an admission of any liability of any Releasee, or an
        acknowledgment of the validity of any Claim released hereunder,
        or as evidence of any such matter.  Releasees specifically deny
        any and all such liability or other responsibility to Releasors
        and the validity of any and all such Claims.

             8.   This Agreement and Release and all of its covenants,
        agreements, representations, warranties, terms and conditions
        shall be binding upon and shall insure to the benefit of (1) the
        successors, heirs and assigns hereafter of each of the parties
        hereto, and (2) any persons  and/or entities that acquire all or
        part of the assets of any of the parties hereto.

             9.   No waiver or compromise of any default under or breach
        of this Agreement and Release or any indulgence granted with
        respect to the performance of any obligation hereunder shall
        constitute or be deemed to imply a waiver of (1) any subsequent
        breach of this Agreement and Release or (2) the strict
        performance of any further obligations hereunder.

                                          6PAGE
<PAGE>
             10.  This Agreement and Release sets forth the entire
        agreement between the parties and fully supersedes any and all
        prior agreements, representations and understandings between the
        parties hereto pertaining to the subject matter hereof.  No
        change, modification or addition, amendment or supplement to this
        Agreement and Release shall be valid unless set forth in writing
        and signed and dated by each and all of the parties hereto.

             11.  This Agreement and Release shall be governed by and
        construed in accordance with the laws of the State of New York
        (without regard to principles of conflicts of law).

             12.  This Agreement and Release may be executed in separate
        counterparts.


             IN WITNESS WHEREOF, the parties have caused this Agreement
        and Release to be executed by their duly authorized
        representatives as of the date first set forth above.

        Fisons plc                    Thermo Instrument Systems Inc.

        By:    /s/ Guillaume Prache   By:    /s/ Earl R. Lewis

        Name:  Guillaume Prache       Name:  Earl R. Lewis

        Title: Sr. Vice President     Title: President                   
               and Chief Financial
               Officer

                

                                      Thermo Electron Corporation

                                      By:    /s/ Earl R. Lewis

                                      Name:  Earl R. Lewis


                                      Title: Vice President

                                          7PAGE
<PAGE>
        RHONE-POULENC RORER

        RHONE-POULENC RORER INC.
        500 ARCOLA ROAD
        P.O. BOX 1200
        COLLEGEVILLE, PA 19426-0107
        TEL. 610-454-8000




                                           December 15, 1997

        Thermo Instrument Systems Inc.
        81 Wyman Street
        Waltham, MA 02251

             Re:  Guarantee (the "Guarantee") of Rhone-Poulenc Rorer Inc.
                  ("RPR"), dated March 29, 1996, with respect to Asset
                  and Stock Purchase Agreement (the "Agreement") dated as
                  of March 29, 1996 among Thermo Instrument Systems Inc.,
                  Thermo Electron Corporation and Fisons plc

        Gentlemen:

             This will confirm that RPR as Guarantor under the
        above-referenced Guarantee acknowledges and consents to the
        revisions to the Agreement made by the Agreement and Release,
        dared as of December 15, 1997, between Fisons plc, Thermo
        Instrument Systems Inc. and Thermo Electron Corporation.

                                           Very truly your,

                                           RHONE-POULENC RORER INC.


                                           By: /s/ Richard B. Young
                                                Richard B. Young
                                                Vice President
          



                                                        EXHIBIT 10.7

              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT 
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 2nd day of
        December, 1997, by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
                                        1PAGE
<PAGE>
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
                                        2
PAGE
<PAGE>
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.  

                                        3PAGE
<PAGE>
        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
                                        4PAGE
<PAGE>
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.

                                        5PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


                                      By:  /s/ Melissa F. Riordan

                                      Title:    Treasurer


                                      THERMO INSTRUMENT SYSTEMS INC.


                                      By:  /s/ Earl R. Lewis

                                      Title:    President



                                                EXHIBIT 10.10
                         THERMO INSTRUMENT SYSTEMS INC.
                     RESTATED STOCK HOLDING ASSISTANCE PLAN

        SECTION 1.   Purpose.

             The purpose of this Plan is to benefit Thermo Instrument
        Systems Inc. (the "Company") and its stockholders by encouraging
        Key Employees to acquire and maintain share ownership in the
        Company, by increasing such employees' proprietary interest in
        promoting the growth and performance of the Company and its
        subsidiaries and by providing for the implementation of the Stock
        Holding Policy.  

        SECTION 2.     Definitions.

             The following terms, when used in the Plan, shall have the
        meanings set forth below:

             Committee:   The Human Resources Committee of the Board of
        Directors of the Company as appointed from time to time.

             Common Stock:   The common stock of the Company and any
        successor thereto.

             Company:   Thermo Instrument Systems Inc., a Delaware
        corporation.

             Stock Holding Policy:   The Stock Holding Policy of the
        Company, as adopted by the Committee and as in effect from time
        to time.

             Key Employee:   Any employee of the Company or any of its
        subsidiaries, including any officer or member of the Board of
        Directors who is also an employee, as designated by the
        Committee, and who, in the judgment of the Committee, will be in
        a position to contribute significantly to the attainment of the
        Company's strategic goals and long-term growth and prosperity.

             Loans:   Loans extended to Key Employees by the Company
        pursuant to this Plan.

             Plan:   The Thermo Instrument Systems Inc. Stock Holding
        Assistance Plan, as amended from time to time.

        SECTION 3.     Administration.

             The Plan and the Stock Holding Policy shall be administered
        by the Committee, which shall have authority to interpret the
        Plan and the Stock Holding Policy and, subject to their
        provisions, to prescribe, amend and rescind any rules and
        regulations and to make all other determinations necessary or
        desirable for the administration thereof.  The Committee's
PAGE
<PAGE>
        interpretations and decisions with regard to the Plan and the
        Stock Holding Policy and such rules and regulations as may be
        established thereunder shall be final and conclusive.  The
        Committee may correct any defect or supply any omission or
        reconcile any inconsistency in the Plan or the Stock Holding
        Policy, or in any Loan in the manner and to the extent the
        Committee deems desirable to carry it into effect.  No member of
        the Committee shall be liable for any action or omission in
        connection with the Plan or the Stock Holding Policy that is made
        in good faith.

        SECTION 4.     Loans and Loan Limits.

             The Committee has determined that the provision of Loans
        from time to time to Key Employees in such amounts as to cause
        such Key Employees to comply with the Stock Holding Policy is, in
        the judgment of the Committee, reasonably expected to benefit the
        Company and authorizes the Company to extend Loans from time to
        time to Key Employees in such amounts as may be requested by such
        Key Employees in order to comply with the Stock Holding Policy.
        Such Loans may be used solely for the purpose of acquiring Common
        Stock (other than upon the exercise of stock options or under
        employee stock purchase plans) in open market transactions or
        from the Company.

             Each Loan shall be full recourse and evidenced by a
        non-interest bearing promissory note substantially in the form
        attached hereto as Exhibit A (the "Note") and maturing in
        accordance with the provisions of Section 6 hereof, and
        containing such other terms and conditions, which are not
        inconsistent with the provisions of the Plan and the Stock
        Holding Policy, as the Committee shall determine in its sole and
        absolute discretion.

        SECTION 5.     Federal Income Tax Treatment of Loans.

             For federal income tax purposes, interest on Loans shall be
        imputed on any interest free Loan extended under the Plan.  A Key
        Employee shall be deemed to have paid the imputed interest to the
        Company and the Company shall be deemed to have paid said imputed
        interest back to the Key Employee as additional compensation.
        The deemed interest payment shall be taxable to the Company as
        income, and may be deductible to the Key Employee to the extent
        allowable under the rules relating to investment interest.  The
        deemed compensation payment to the Key Employee shall be taxable
        to the employee and deductible to the Company, but shall also be
        subject to employment taxes such as FICA and FUTA.

        SECTION 6.     Maturity of Loans.

             Each Loan to a Key Employee hereunder shall be due and
        payable on demand by the Company.  If no such demand is made,
        then each Loan shall mature and the principal thereof shall
        become due and payable on the fifth anniversary of the date of
PAGE
<PAGE>
        the Loan, provided that the Committee may, in its sole and
        absolute discretion, authorize such other maturity and repayment
        schedule as the Committee may determine.  Each Loan shall also
        become immediately due and payable in full, without demand, upon
        the occurrence of any of the events set forth in the Note;
        provided that the Committee may, in its sole and absolute
        discretion, authorize an extension of the time for repayment of a
        Loan upon such terms and conditions as the Committee may
        determine.

        SECTION 7.     Amendment and Termination of the Plan.

             The Committee may from time to time alter or amend the Plan
        or the Stock Holding Policy in any respect, or terminate the Plan
        or the Stock Holding Policy at any time.  No such amendment or
        termination, however, shall alter or otherwise affect the terms
        and conditions of any Loan then outstanding to Key Employee
        without such Key Employee's written consent, except as otherwise
        provided herein or in the promissory note evidencing such Loan.

        SECTION 8.     Miscellaneous Provisions.

             (a)  No employee or other person shall have any claim or
        right to receive a Loan under the Plan, and no employee shall
        have any right to be retained in the employ of the Company due to
        his or her participation in the Plan.

             (b)  No Loan shall be made hereunder unless counsel for the
        Company shall be satisfied that such Loan will be in compliance
        with applicable federal, state and local laws.

             (c)  The expenses of the Plan shall be borne by the Company.

             (d)  The Plan shall be unfunded, and the Company shall not
        be required to establish any special or separate fund or to make
        any other segregation of assets to assure the making of any Loan
        under the Plan.

             (e)  Except as otherwise provided in Section 7 hereof, by
        accepting any Loan under the Plan, each Key Employee shall be
        conclusively deemed to have indicated his acceptance and
        ratification of, and consent to, any action taken under the Plan
        or the Stock Holding Policy by the Company, the Board of
        Directors of the Company or the Committee.

             (f)  The appropriate officers of the Company shall cause to
        be filed any reports, returns or other information regarding
        Loans hereunder, as may be required by any applicable statute,
        rule or regulation.

        SECTION 9.     Effective Date.

             The Plan and the Stock Holding Policy shall become effective
        upon approval and adoption by the Committee.
PAGE
<PAGE>
                               EXHIBIT A TO STOCK HOLDING ASSISTANCE PLAN


                         THERMO INSTRUMENT SYSTEMS INC.

                                 Promissory Note



        $_________                                                       
                                                Dated:____________


             For value  received, ________________,  an individual  whose
        residence is located at _______________________ (the "Employee"),
        hereby promises to  pay to  Thermo Instrument  Systems Inc.  (the
        "Company"), or assigns, ON DEMAND, but  in any case on or  before
        [insert date which is the fifth anniversary of date of  issuance]
        (the "Maturity  Date"),  the principal  sum  of [loan  amount  in
        words] ($_______), or such part  thereof as then remains  unpaid,
        without interest.  Principal shall be payable in lawful money  of
        the United States of America, in immediately available funds,  at
        the principal office of the Company or at such other place as the
        Company may  designate  from  time  to time  in  writing  to  the
        Employee. 

             Unless the Company has already made a demand for payment  in
        full of this Note,  the Employee agrees to  repay to the  Company
        from the Employee's annual cash incentive compensation  (referred
        to as  bonus), beginning  with the  first such  bonus payment  to
        occur after the date of  this Note and on  each of the next  four
        bonus payment dates  occurring prior to  the Maturity Date,  such
        amount as may be designated by the Company. Any amount  remaining
        unpaid under this Note shall be  due and payable on the  Maturity
        Date.

             This Note may be prepaid at  any time or from time to  time,
        in whole  or  in part,  without  any  premium or  penalty.    The
        Employee acknowledges and agrees that the Company has advanced to
        the Employee the principal  amount of this  Note pursuant to  the
        Company's Stock Holding Assistance Plan,  and that all terms  and
        conditions of such Plan are incorporated herein by reference.  

             The unpaid principal amount of this Note shall be and become
        immediately due  and payable  without notice  or demand,  at  the
        option of  the  Company,  upon  the  occurrence  of  any  of  the
        following events:

                  (a)  the termination of the Employee's employment  with
             the Company, with or without cause, for any reason or for no
             reason;

                  (b)  the death or disability of the Employee;
PAGE
<PAGE>
                  (c)  the failure  of the  Employee to  pay his  or  her
             debts as they  become due, the  insolvency of the  Employee,
             the filing by or against the Employee of any petition  under
             the United  States Bankruptcy  Code (or  the filing  of  any
             similar  petition   under   the  insolvency   law   of   any
             jurisdiction),  or  the  making   by  the  Employee  of   an
             assignment or trust mortgage for the benefit of creditors or
             the appointment of  a receiver, custodian  or similar  agent
             with respect  to,  or  the  taking by  any  such  person  of
             possession of, any property of the Employee; or

                  (d)  the issuance of any writ of attachment, by trustee
             process or otherwise, or any restraining order or injunction
             not removed, repealed or  dismissed within thirty (30)  days
             of issuance, against or affecting the person or property  of
             the Employee or any liability or obligation of the  Employee
             to the Company.

             In case any payment  herein provided for  shall not be  paid
        when due,  the Employee  further  promises to  pay all  costs  of
        collection, including all reasonable attorneys' fees.

             No  delay  or  omission  on  the  part  of  the  Company  in
        exercising any right hereunder shall operate as a waiver of  such
        right or of any other right of the Company, nor shall any  delay,
        omission or waiver  on any  one occasion be  deemed a  bar to  or
        waiver of the  same or any  other right on  any future  occasion.
        The  Employee  hereby  waives  presentment,  demand,  notice   of
        prepayment,  protest  and  all  other  demands  and  notices   in
        connection with the delivery, acceptance, performance, default or
        enforcement of this Note.  The undersigned hereby assents to  any
        indulgence  and  any  extension  of  time  for  payment  of   any
        indebtedness  evidenced  hereby  granted  or  permitted  by   the
        Company.  

             This Note  has been  made pursuant  to the  Company's  Stock
        Holding Assistance Plan and shall be governed by and construed in
        accordance with, such Plan and the laws of the State of  Delaware
        and shall have the effect of a sealed instrument.


                                      _______________________________

                                      Employee Name: _________________


        ________________________
        Witness




                                                EXHIBIT 10.28

                         THERMO INSTRUMENT SYSTEMS INC.

           METRIKA SYSTEMS CORPORATION NONQUALIFIED STOCK OPTION PLAN


        1.   Purpose

             This Nonqualified Stock Option Plan (the "Plan") is intended
        to encourage  ownership of  Common Stock,  $0.01 par  value  (the
        "Common Stock"), of Metrika Systems Corporation    ("Subsidiary"),
        a subsidiary of Thermo  Instrument Systems Inc.  (the "Company"),
        by persons selected  by the  Board of Directors  (or a  committee
        thereof) in its sole  discretion, including directors,  executive
        officers, key employees  and consultants of  the Company and  its
        subsidiaries, and  to provide  additional incentive  for them  to
        promote  the  success  of  the   business  of  the  Company   and
        Subsidiary.   The Plan  is intended  to be  a nonstatutory  stock
        option plan.

        2.   Effective Date of the Plan

             The Plan shall become effective when adopted by the Board of
        Directors of the Company.

        3.   Stock Subject to Plan

             At no time shall  the number of shares  of the Common  Stock
        then outstanding  which  are  attributable  to  the  exercise  of
        options granted under  the Plan  plus the number  of shares  then
        issuable upon the exercise  of outstanding options granted  under
        the  Plan  exceed  100,000  shares,  subject however, to the
        provisions of paragraph 11 of the Plan.  Shares to be issued upon
        the exercise of options granted under the Plan shall be shares of
        Subsidiary beneficially  owned by  the Company.   If  any  option
        expires  or  terminates  for  any  reason  without  having   been
        exercised in full, the  unpurchased shares subject thereto  shall
        again be available for options thereafter to be granted.

        4.   Administration

             The  Plan  shall  be   administered  by  a  committee   (the
        "Committee") composed of the members of the Board of Directors of
        the Company,  no  member  of  which shall  act  upon  any  matter
        exclusively affecting  any option  granted or  to be  granted  to
        himself or herself under the Plan.  Subject to the provisions  of
        the Plan, the  Committee shall  have complete  authority, in  its
        discretion, to make the following determinations with respect  to
        each option to  be granted  by the Company:   (a)  the person  to
        receive the option (the "Optionee"); (b) the time of granting the
        option; (c) the number of shares subject thereto; (d) the  option
        price; (e) the option period; and (f) the terms of the option and
        form of option agreement (which need not be identical, but  which
        shall conform to the applicable terms and conditions of the  Plan
        and contain such other provisions as the Board of Directors deems
PAGE
<PAGE>
        advisable and not inconsistent  with the Plan).   In making  such
        determinations, the Committee may take into account the nature of
        the  services  rendered  by  the  Optionees,  their  present  and
        potential contributions to the success of the Company and/or  one
        or more  of  its subsidiaries,  and  such other  factors  as  the
        Committee in its discretion shall deem relevant.  Subject to  the
        provisions of the  Plan, the Committee  shall also have  complete
        authority to interpret the Plan, to prescribe, amend, and rescind
        rules and regulations relating to it, to determine the terms  and
        provisions of the respective option agreements (which need not be
        identical), and  to make  all other  determinations necessary  or
        advisable for the  administration of the  Plan.  The  Committee's
        determinations on the  matters referred  to in  this paragraph  4
        shall be conclusive.

        5.   Eligibility

             An option  may be  granted  to any  person selected  by  the
        Committee in its sole discretion.

        6.   Time of Granting Options

             The granting  of an  option  shall take  place at  the  time
        specified by the Committee.  Only if expressly so provided by the
        Committee shall the granting of  an option be regarded as  taking
        place at the time when a written option agreement shall have been
        duly executed and delivered  by or on behalf  of the Company  and
        the Optionee to whom such option shall be granted.  The agreement
        shall provide, among other things,  that it does not confer  upon
        an Optionee any right  to continue in the  employ of the  Company
        and/or one  or more  of  its subsidiaries  or  to continue  as  a
        director or  consultant of  the  Company, and  that it  does  not
        interfere in any way  with the right of  the Company or any  such
        subsidiary to terminate  the employment  of the  Optionee at  any
        time if the Optionee is an employee, to remove the Optionee as  a
        director of the  Company if  the Optionee  is a  director, or  to
        terminate the  services of  the  Optionee if  the Optionee  is  a
        consultant.

        7.   Option Period

             An option  may become  exercisable  immediately or  in  such
        installments, cumulative or noncumulative,  as the Committee  may
        determine.  

        8.   Exercise of Option

             An option may be exercised  in accordance with its terms  by
        written notice of intent to  exercise the option, specifying  the
        number of shares  of stock with  respect to which  the option  is
        then being exercised.  The notice shall be accompanied by payment
        in the form  of cash or  shares of Subsidiary  Common Stock  (the
        "Tendered Shares") with a then current market value equal to  the
        option price of  the shares to  be purchased; provided,  however,
PAGE
<PAGE>
        that such  Tendered  Shares  shall  have  been  acquired  by  the
        Optionee more  than six  months prior  to the  date of  exercise,
        unless such  requirement is  waived in  writing by  the  Company.
        Against such payment  the Company  shall deliver or  cause to  be
        delivered to the Optionee a certificate for the number of  shares
        then being purchased, registered in  the name of the Optionee  or
        other person exercising  the option.   If any  law or  applicable
        regulation of  the Securities  and Exchange  Commission or  other
        body having  jurisdiction  in  the  premises  shall  require  the
        Company, Subsidiary  or  the  Optionee  to  take  any  action  in
        connection with  shares  being  purchased upon  exercise  of  the
        option, exercise of the option and delivery of the certificate or
        certificates for such shares shall be postponed until  completion
        of the necessary action,  which shall be  taken at the  Company's
        expense.

        9.   Transferability

             Except as may be  authorized by the  Committee , in its sole
        discretion, no  Option   may be transferred other than by will or
        the laws of  descent and  distribution, and  during a  Optionee's
        lifetime an option  requiring exercise  may be exercised  only by
        him or her (or in the event of incapacity, the person or  persons
        properly appointed to act on his or her behalf). The Committee   
        may, in its  discretion, determine  the extent  to which  options
        granted to an Optionee shall be transferable, and such provisions
        permitting or acknowledging  transfer shall be  set forth in  the
        written agreement evidencing the option executed and delivered by
        or on behalf of the Company and the Optionee.

        10.  Vesting, Restrictions and Termination of Options

             The Committee,  in its  sole discretion,  may determine  the
        manner in which options shall vest, the rights of the Company  to
        repurchase the shares issued upon the exercise of any option  and
        the manner in which such rights  shall lapse, and the terms  upon
        which any option granted shall terminate.  The Board of Directors
        shall have the right  to accelerate the date  of exercise of  any
        installment  or  to  accelerate   the  lapse  of  the   Company's
        repurchase rights.   All of such  terms shall be  specified in  a
        written option agreement executed and  delivered by or on  behalf
        of the Company  and the  Optionee to  whom such  option shall  be
        granted.

        11.  Adjustment of Number of Shares

             Each stock option agreement shall provide that in the  event
        of any stock dividend payable in the Common Stock or any split-up
        or contraction  in  the number  of  shares of  the  Common  Stock
        occurring after  the  date of  the  agreement and  prior  to  the
        exercise in full of  the option, the number  of shares for  which
        the option may thereafter  be exercised shall be  proportionately
        adjusted and the price to be  paid for each share subject to  the
        option shall be  proportionately adjusted.   Each such  agreement
PAGE
<PAGE>
        shall also provide that in case of any reclassification or change
        of outstanding  shares of  the Common  Stock or  in case  of  any
        consolidation or  merger  of  Subsidiary  with  or  into  another
        company or in case of any  sale or conveyance to another  company
        or  entity  of  the  property   of  Subsidiary  as  a  whole   or
        substantially as a  whole, the Optionee  shall, upon exercise  of
        the option,  be entitled  to  receive shares  of stock  or  other
        securities in its  place equivalent  in kind and  value to  those
        shares which  he would  have  received if  he had  exercised  the
        option  in  full  immediately  prior  to  such  reclassification,
        change,  consolidation,  merger,  sale  or  conveyance  and   had
        continued to hold the shares subject to the option (together with
        all other  shares,  stock  and securities  thereafter  issued  in
        respect thereof)  to the  time  of the  exercise of  the  option;
        provided , that if any recapitalization is to be effected  through
        an increase  in the  par value  of the  Common Stock  without  an
        increase in  the number  of authorized  shares and  such new  par
        value will  exceed the  option price  under such  agreement,  the
        Company   shall   notify   the   Optionee   of   such    proposed
        recapitalization, and  the Optionee  shall then  have the  right,
        exercisable at any time  prior to such recapitalization  becoming
        effective, to purchase all  of the shares  subject to the  option
        which  he  has  not  theretofore  purchased  (anything  in   such
        agreement to the contrary  notwithstanding), but if the  Optionee
        fails to exercise such right before such recapitalization becomes
        effective,  the  option  price  under  such  agreement  shall  be
        appropriately  adjusted.    Each  such  agreement  shall  further
        provide that upon dissolution  or liquidation of Subsidiary,  the
        option shall  terminate, but  the  Optionee (if  at the  time  an
        employee or director of the Company and/or any one or more of its
        subsidiaries) shall  have the  right, immediately  prior to  such
        dissolution or liquidation,  to exercise the  option to the  full
        extent not theretofore exercised; that no adjustment provided for
        above shall apply to any share  with respect to which the  option
        has  been  exercised  prior  to   the  effective  date  of   such
        adjustment; and that no fraction of a share or fractional  shares
        shall be purchasable or deliverable under such agreement, but  in
        the event  any  adjustment thereunder  of  the number  of  shares
        covered by  the  option shall  cause  such number  to  include  a
        fraction of  a share,  such  fraction shall  be adjusted  to  the
        nearest smaller whole number of shares.  In the event of  changes
        in the outstanding Common Stock by reason of any stock  dividend,
        split-up, contraction, reclassification, or change of outstanding
        shares of the  Common Stock  of the nature  contemplated by  this
        paragraph 11, the number of shares of Common Stock available  for
        the purpose of the Plan as stated in paragraph 3 hereof shall  be
        correspondingly adjusted by the Committee.

        12.  Limitation of Rights in Option Stock

             The Optionees  shall  have  no  rights  as  stockholders  in
        respect of shares as to which  their options shall not have  been
        exercised, certificates  issued  and  delivered  and  payment  as
PAGE
<PAGE>
        herein provided  made in  full,  and shall  have no  rights  with
        respect to such shares not expressly conferred by this Plan.

        13.  Stock Reserved

             The Company  shall  at all  times  during the  term  of  the
        options reserve and keep available  such number of shares of  the
        Common Stock as will be sufficient to satisfy the requirements of
        this Plan and shall pay  all other fees and expenses  necessarily
        incurred by the Company in connection therewith.

        14.  Securities Laws Restrictions

             Each Optionee exercising  an option, at  the request of  the
        Company, will  be  required  to give  a  representation  in  form
        satisfactory  to  counsel  for  the  Company  that  he  will  not
        transfer, sell or otherwise dispose  of the shares received  upon
        exercise of  the  option  at  any time  purchased  by  him,  upon
        exercise of any portion  of the option, in  a manner which  would
        violate  the  Securities  Act  of  1933,  as  amended,  and   the
        regulations of the Securities and Exchange Commission  thereunder
        and the Company  may, if required  or at its  discretion, make  a
        notation on any certificates issued  upon exercise of options  to
        the effect that  such certificate may  not be transferred  except
        after  receipt  by   the  Company  of   an  opinion  of   counsel
        satisfactory to  it to  the effect  that such  transfer will  not
        violate such Act and such regulations.

        15.  Tax Withholding

             The Company shall have the right to deduct from payments  of
        any kind otherwise due to an Optionee any federal, state or local
        taxes of any kind required by law to be withheld with respect  to
        any shares issued upon  exercise of options  under the Plan  (the
        "withholding requirements").  The  Committee will have the  right
        to require that the Optionee or other appropriate person remit to
        the Company  an  amount  sufficient to  satisfy  the  withholding
        requirements, or  make  other arrangements  satisfactory  to  the
        Committee with regard to such requirements, prior to the delivery
        of any Common Stock pursuant to exercise of an option.  If and to
        the extent that such withholding  is required, the Committee  may
        permit the Optionee or  such other person to  elect at such  time
        and in such manner as the Committee provides to have the  Company
        hold back from the shares to  be delivered, or to deliver to  the
        Company, Common Stock  having a value  calculated to satisfy  the
        withholding requirements.

        16.  Termination and Amendment of Plan

             The Board of  Directors may at  any time, and  from time  to
        time, modify or amend the Plan in any respect, except that if  at
        any time  the approval  of  the Stockholders  of the  Company  is
        required as to such modification  or amendment under Rule  16b-3,
PAGE
<PAGE>
        the Board  of  Directors  may not  effect  such  modification  or
        amendment without such approval.

             The termination or any modification or amendment of the Plan
        shall not, without the consent of an Optionee, affect his or  her
        rights under an option  previously granted to him  or her.   With
        the consent of the Optionees affected, the Board of Directors may
        amend outstanding option agreements in a manner not  inconsistent
        with the Plan.   The Board of Directors  shall have the right  to
        amend or modify the terms and  provisions of the Plan and of  any
        outstanding  option  to  the  extent  necessary  to  ensure   the
        qualification of the Plan under Rule 16b-3.

             Notwithstanding any other provisions hereof, the Plan  shall
        terminate on December 31,  2008   and no options  shall be granted
        hereunder thereafter.




                                                EXHIBIT 10.29
                         THERMO INSTRUMENT SYSTEMS INC.

            THERMO VISION CORPORATION NONQUALIFIED STOCK OPTION PLAN


        1.   Purpose

             This Nonqualified Stock Option Plan (the "Plan") is intended
        to encourage  ownership of  Common Stock,  $0.01 par  value  (the
        "Common Stock"), of Thermo Vision  Corporation    ("Subsidiary"), a
        subsidiary of Thermo Instrument Systems Inc.  (the "Company"), by
        persons selected  by  the  Board of  Directors  (or  a  committee
        thereof) in its sole  discretion, including directors,  executive
        officers, key employees  and consultants of  the Company and  its
        subsidiaries, and  to provide  additional incentive  for them  to
        promote  the  success  of  the   business  of  the  Company   and
        Subsidiary.   The Plan  is intended  to be  a nonstatutory  stock
        option plan.

        2.   Effective Date of the Plan

             The Plan shall become effective when adopted by the Board of
        Directors of the Company.

        3.   Stock Subject to Plan

             At no time shall  the number of shares  of the Common  Stock
        then outstanding  which  are  attributable  to  the  exercise  of
        options granted under  the Plan  plus the number  of shares  then
        issuable upon the exercise  of outstanding options granted  under
        the  Plan  exceed  100,000  shares, subject however, to the
        provisions of paragraph 11 of the Plan.  Shares to be issued upon
        the exercise of options granted under the Plan shall be shares of
        Subsidiary beneficially  owned by  the Company.   If  any  option
        expires  or  terminates  for  any  reason  without  having   been
        exercised in full, the  unpurchased shares subject thereto  shall
        again be available for options thereafter to be granted.

        4.   Administration

             The  Plan  shall  be   administered  by  a  committee   (the
        "Committee") composed of the members of the Board of Directors of
        the Company,  no  member  of  which shall  act  upon  any  matter
        exclusively affecting  any option  granted or  to be  granted  to
        himself or herself under the Plan.  Subject to the provisions  of
        the Plan, the  Committee shall  have complete  authority, in  its
        discretion, to make the following determinations with respect  to
        each option to  be granted  by the Company:   (a)  the person  to
        receive the option (the "Optionee"); (b) the time of granting the
        option; (c) the number of shares subject thereto; (d) the  option
        price; (e) the option period; and (f) the terms of the option and
        form of option agreement (which need not be identical, but  which
        shall conform to the applicable terms and conditions of the  Plan
        and contain such other provisions as the Board of Directors deems
PAGE
<PAGE>
        advisable and not inconsistent  with the Plan).   In making  such
        determinations, the Committee may take into account the nature of
        the  services  rendered  by  the  Optionees,  their  present  and
        potential contributions to the success of the Company and/or  one
        or more  of  its subsidiaries,  and  such other  factors  as  the
        Committee in its discretion shall deem relevant.  Subject to  the
        provisions of the  Plan, the Committee  shall also have  complete
        authority to interpret the Plan, to prescribe, amend, and rescind
        rules and regulations relating to it, to determine the terms  and
        provisions of the respective option agreements (which need not be
        identical), and  to make  all other  determinations necessary  or
        advisable for the  administration of the  Plan.  The  Committee's
        determinations on the  matters referred  to in  this paragraph  4
        shall be conclusive.

        5.   Eligibility

             An option  may be  granted  to any  person selected  by  the
        Committee in its sole discretion.

        6.   Time of Granting Options

             The granting  of an  option  shall take  place at  the  time
        specified by the Committee.  Only if expressly so provided by the
        Committee shall the granting of  an option be regarded as  taking
        place at the time when a written option agreement shall have been
        duly executed and delivered  by or on behalf  of the Company  and
        the Optionee to whom such option shall be granted.  The agreement
        shall provide, among other things,  that it does not confer  upon
        an Optionee any right  to continue in the  employ of the  Company
        and/or one  or more  of  its subsidiaries  or  to continue  as  a
        director or  consultant of  the  Company, and  that it  does  not
        interfere in any way  with the right of  the Company or any  such
        subsidiary to terminate  the employment  of the  Optionee at  any
        time if the Optionee is an employee, to remove the Optionee as  a
        director of the  Company if  the Optionee  is a  director, or  to
        terminate the  services of  the  Optionee if  the Optionee  is  a
        consultant.

        7.   Option Period

             An option  may become  exercisable  immediately or  in  such
        installments, cumulative or noncumulative,  as the Committee  may
        determine.  

        8.   Exercise of Option

             An option may be exercised  in accordance with its terms  by
        written notice of intent to  exercise the option, specifying  the
        number of shares  of stock with  respect to which  the option  is
        then being exercised.  The notice shall be accompanied by payment
        in the form  of cash or  shares of Subsidiary  Common Stock  (the
        "Tendered Shares") with a then current market value equal to  the
        option price of  the shares to  be purchased; provided,  however,
PAGE
<PAGE>
        that such  Tendered  Shares  shall  have  been  acquired  by  the
        Optionee more  than six  months prior  to the  date of  exercise,
        unless such  requirement is  waived in  writing by  the  Company.
        Against such payment  the Company  shall deliver or  cause to  be
        delivered to the Optionee a certificate for the number of  shares
        then being purchased, registered in  the name of the Optionee  or
        other person exercising  the option.   If any  law or  applicable
        regulation of  the Securities  and Exchange  Commission or  other
        body having  jurisdiction  in  the  premises  shall  require  the
        Company, Subsidiary  or  the  Optionee  to  take  any  action  in
        connection with  shares  being  purchased upon  exercise  of  the
        option, exercise of the option and delivery of the certificate or
        certificates for such shares shall be postponed until  completion
        of the necessary action,  which shall be  taken at the  Company's
        expense.

        9.   Transferability

             Except as may be  authorized by the  Committee , in its sole
        discretion, no  Option   may be transferred other than by will or
        the laws of  descent and  distribution, and  during a  Optionee's
        lifetime an option    requiring exercise  may be exercised  only by
        him or her (or in the event of incapacity, the person or  persons
        properly appointed to act on his or her behalf). The Committee   
        may, in its  discretion, determine  the extent  to which  options
        granted to an Optionee shall be transferable, and such provisions
        permitting or acknowledging  transfer shall be  set forth in  the
        written agreement evidencing the option executed and delivered by
        or on behalf of the Company and the Optionee.

        10.  Vesting, Restrictions and Termination of Options

             The Committee,  in its  sole discretion,  may determine  the
        manner in which options shall vest, the rights of the Company  to
        repurchase the shares issued upon the exercise of any option  and
        the manner in which such rights  shall lapse, and the terms  upon
        which any option granted shall terminate.  The Board of Directors
        shall have the right  to accelerate the date  of exercise of  any
        installment  or  to  accelerate   the  lapse  of  the   Company's
        repurchase rights.   All of such  terms shall be  specified in  a
        written option agreement executed and  delivered by or on  behalf
        of the Company  and the  Optionee to  whom such  option shall  be
        granted.

        11.  Adjustment of Number of Shares

             Each stock option agreement shall provide that in the  event
        of any stock dividend payable in the Common Stock or any split-up
        or contraction  in  the number  of  shares of  the  Common  Stock
        occurring after  the  date of  the  agreement and  prior  to  the
        exercise in full of  the option, the number  of shares for  which
        the option may thereafter  be exercised shall be  proportionately
        adjusted and the price to be  paid for each share subject to  the
        option shall be  proportionately adjusted.   Each such  agreement
PAGE
<PAGE>
        shall also provide that in case of any reclassification or change
        of outstanding  shares of  the Common  Stock or  in case  of  any
        consolidation or  merger  of  Subsidiary  with  or  into  another
        company or in case of any  sale or conveyance to another  company
        or  entity  of  the  property   of  Subsidiary  as  a  whole   or
        substantially as a  whole, the Optionee  shall, upon exercise  of
        the option,  be entitled  to  receive shares  of stock  or  other
        securities in its  place equivalent  in kind and  value to  those
        shares which  he would  have  received if  he had  exercised  the
        option  in  full  immediately  prior  to  such  reclassification,
        change,  consolidation,  merger,  sale  or  conveyance  and   had
        continued to hold the shares subject to the option (together with
        all other  shares,  stock  and securities  thereafter  issued  in
        respect thereof)  to the  time  of the  exercise of  the  option;
        provided , that if any recapitalization is to be effected  through
        an increase  in the  par value  of the  Common Stock  without  an
        increase in  the number  of authorized  shares and  such new  par
        value will  exceed the  option price  under such  agreement,  the
        Company   shall   notify   the   Optionee   of   such    proposed
        recapitalization, and  the Optionee  shall then  have the  right,
        exercisable at any time  prior to such recapitalization  becoming
        effective, to purchase all  of the shares  subject to the  option
        which  he  has  not  theretofore  purchased  (anything  in   such
        agreement to the contrary  notwithstanding), but if the  Optionee
        fails to exercise such right before such recapitalization becomes
        effective,  the  option  price  under  such  agreement  shall  be
        appropriately  adjusted.    Each  such  agreement  shall  further
        provide that upon dissolution  or liquidation of Subsidiary,  the
        option shall  terminate, but  the  Optionee (if  at the  time  an
        employee or director of the Company and/or any one or more of its
        subsidiaries) shall  have the  right, immediately  prior to  such
        dissolution or liquidation,  to exercise the  option to the  full
        extent not theretofore exercised; that no adjustment provided for
        above shall apply to any share  with respect to which the  option
        has  been  exercised  prior  to   the  effective  date  of   such
        adjustment; and that no fraction of a share or fractional  shares
        shall be purchasable or deliverable under such agreement, but  in
        the event  any  adjustment thereunder  of  the number  of  shares
        covered by  the  option shall  cause  such number  to  include  a
        fraction of  a share,  such  fraction shall  be adjusted  to  the
        nearest smaller whole number of shares.  In the event of  changes
        in the outstanding Common Stock by reason of any stock  dividend,
        split-up, contraction, reclassification, or change of outstanding
        shares of the  Common Stock  of the nature  contemplated by  this
        paragraph 11, the number of shares of Common Stock available  for
        the purpose of the Plan as stated in paragraph 3 hereof shall  be
        correspondingly adjusted by the Committee.

        12.  Limitation of Rights in Option Stock

             The Optionees  shall  have  no  rights  as  stockholders  in
        respect of shares as to which  their options shall not have  been
        exercised, certificates  issued  and  delivered  and  payment  as
PAGE
<PAGE>
        herein provided  made in  full,  and shall  have no  rights  with
        respect to such shares not expressly conferred by this Plan.

        13.  Stock Reserved

             The Company  shall  at all  times  during the  term  of  the
        options reserve and keep available  such number of shares of  the
        Common Stock as will be sufficient to satisfy the requirements of
        this Plan and shall pay  all other fees and expenses  necessarily
        incurred by the Company in connection therewith.

        14.  Securities Laws Restrictions

             Each Optionee exercising  an option, at  the request of  the
        Company, will  be  required  to give  a  representation  in  form
        satisfactory  to  counsel  for  the  Company  that  he  will  not
        transfer, sell or otherwise dispose  of the shares received  upon
        exercise of  the  option  at  any time  purchased  by  him,  upon
        exercise of any portion  of the option, in  a manner which  would
        violate  the  Securities  Act  of  1933,  as  amended,  and   the
        regulations of the Securities and Exchange Commission  thereunder
        and the Company  may, if required  or at its  discretion, make  a
        notation on any certificates issued  upon exercise of options  to
        the effect that  such certificate may  not be transferred  except
        after  receipt  by   the  Company  of   an  opinion  of   counsel
        satisfactory to  it to  the effect  that such  transfer will  not
        violate such Act and such regulations.

        15.  Tax Withholding

             The Company shall have the right to deduct from payments  of
        any kind otherwise due to an Optionee any federal, state or local
        taxes of any kind required by law to be withheld with respect  to
        any shares issued upon  exercise of options  under the Plan  (the
        "withholding requirements").  The  Committee will have the  right
        to require that the Optionee or other appropriate person remit to
        the Company  an  amount  sufficient to  satisfy  the  withholding
        requirements, or  make  other arrangements  satisfactory  to  the
        Committee with regard to such requirements, prior to the delivery
        of any Common Stock pursuant to exercise of an option.  If and to
        the extent that such withholding  is required, the Committee  may
        permit the Optionee or  such other person to  elect at such  time
        and in such manner as the Committee provides to have the  Company
        hold back from the shares to  be delivered, or to deliver to  the
        Company, Common Stock  having a value  calculated to satisfy  the
        withholding requirements.

        16.  Termination and Amendment of Plan

             The Board of  Directors may at  any time, and  from time  to
        time, modify or amend the Plan in any respect, except that if  at
        any time  the approval  of  the Stockholders  of the  Company  is
        required as to such modification  or amendment under Rule  16b-3,
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        the Board  of  Directors  may not  effect  such  modification  or
        amendment without such approval.

             The termination or any modification or amendment of the Plan
        shall not, without the consent of an Optionee, affect his or  her
        rights under an option  previously granted to him  or her.   With
        the consent of the Optionees affected, the Board of Directors may
        amend outstanding option agreements in a manner not  inconsistent
        with the Plan.   The Board of Directors  shall have the right  to
        amend or modify the terms and  provisions of the Plan and of  any
        outstanding  option  to  the  extent  necessary  to  ensure   the
        qualification of the Plan under Rule 16b-3.

             Notwithstanding any other provisions hereof, the Plan  shall
        terminate on December 31,  2008   and no options  shall be granted
        hereunder thereafter.




                                                EXHIBIT 10.30
                         THERMO INSTRUMENT SYSTEMS INC.

                ONIX SYSTEMS INC. NONQUALIFIED STOCK OPTION PLAN


        1.   Purpose

             This Nonqualified Stock Option Plan (the "Plan") is intended
        to encourage  ownership of  Common Stock,  $0.01 par  value  (the
        "Common  Stock"),  of  ONIX  Systems  Inc.        ("Subsidiary"),  
        subsidiary of Thermo Instrument Systems Inc.  (the "Company"), by
        persons selected  by  the  Board of  Directors  (or  a  committee
        thereof) in its sole  discretion, including directors,  executive
        officers, key employees  and consultants of  the Company and  its
        subsidiaries, and  to provide  additional incentive  for them  to
        promote  the  success  of  the   business  of  the  Company   and
        Subsidiary.   The Plan  is intended  to be  a nonstatutory  stock
        option plan.

        2.   Effective Date of the Plan

             The Plan shall become effective when adopted by the Board of
        Directors of the Company.

        3.   Stock Subject to Plan

             At no time shall  the number of shares  of the Common  Stock
        then outstanding  which  are  attributable  to  the  exercise  of
        options granted under  the Plan  plus the number  of shares  then
        issuable upon the exercise  of outstanding options granted  under
        the  Plan  exceed  100,000  shares, subject however, to the
        provisions of paragraph 11 of the Plan.  Shares to be issued upon
        the exercise of options granted under the Plan shall be shares of
        Subsidiary beneficially  owned by  the Company.   If  any  option
        expires  or  terminates  for  any  reason  without  having   been
        exercised in full, the  unpurchased shares subject thereto  shall
        again be available for options thereafter to be granted.

        4.   Administration

             The  Plan  shall  be   administered  by  a  committee   (the
        "Committee") composed of the members of the Board of Directors of
        the Company,  no  member  of  which shall  act  upon  any  matter
        exclusively affecting  any option  granted or  to be  granted  to
        himself or herself under the Plan.  Subject to the provisions  of
        the Plan, the  Committee shall  have complete  authority, in  its
        discretion, to make the following determinations with respect  to
        each option to  be granted  by the Company:   (a)  the person  to
        receive the option (the "Optionee"); (b) the time of granting the
        option; (c) the number of shares subject thereto; (d) the  option
        price; (e) the option period; and (f) the terms of the option and
        form of option agreement (which need not be identical, but  which
        shall conform to the applicable terms and conditions of the  Plan
        and contain such other provisions as the Board of Directors deems
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        advisable and not inconsistent  with the Plan).   In making  such
        determinations, the Committee may take into account the nature of
        the  services  rendered  by  the  Optionees,  their  present  and
        potential contributions to the success of the Company and/or  one
        or more  of  its subsidiaries,  and  such other  factors  as  the
        Committee in its discretion shall deem relevant.  Subject to  the
        provisions of the  Plan, the Committee  shall also have  complete
        authority to interpret the Plan, to prescribe, amend, and rescind
        rules and regulations relating to it, to determine the terms  and
        provisions of the respective option agreements (which need not be
        identical), and  to make  all other  determinations necessary  or
        advisable for the  administration of the  Plan.  The  Committee's
        determinations on the  matters referred  to in  this paragraph  4
        shall be conclusive.

        5.   Eligibility

             An option  may be  granted  to any  person selected  by  the
        Committee in its sole discretion.

        6.   Time of Granting Options

             The granting  of an  option  shall take  place at  the  time
        specified by the Committee.  Only if expressly so provided by the
        Committee shall the granting of  an option be regarded as  taking
        place at the time when a written option agreement shall have been
        duly executed and delivered  by or on behalf  of the Company  and
        the Optionee to whom such option shall be granted.  The agreement
        shall provide, among other things,  that it does not confer  upon
        an Optionee any right  to continue in the  employ of the  Company
        and/or one  or more  of  its subsidiaries  or  to continue  as  a
        director or  consultant of  the  Company, and  that it  does  not
        interfere in any way  with the right of  the Company or any  such
        subsidiary to terminate  the employment  of the  Optionee at  any
        time if the Optionee is an employee, to remove the Optionee as  a
        director of the  Company if  the Optionee  is a  director, or  to
        terminate the  services of  the  Optionee if  the Optionee  is  a
        consultant.

        7.   Option Period

             An option  may become  exercisable  immediately or  in  such
        installments, cumulative or noncumulative,  as the Committee  may
        determine.  

        8.   Exercise of Option

             An option may be exercised  in accordance with its terms  by
        written notice of intent to  exercise the option, specifying  the
        number of shares  of stock with  respect to which  the option  is
        then being exercised.  The notice shall be accompanied by payment
        in the form  of cash or  shares of Subsidiary  Common Stock  (the
        "Tendered Shares") with a then current market value equal to  the
        option price of  the shares to  be purchased; provided,  however,
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        that such  Tendered  Shares  shall  have  been  acquired  by  the
        Optionee more  than six  months prior  to the  date of  exercise,
        unless such  requirement is  waived in  writing by  the  Company.
        Against such payment  the Company  shall deliver or  cause to  be
        delivered to the Optionee a certificate for the number of  shares
        then being purchased, registered in  the name of the Optionee  or
        other person exercising  the option.   If any  law or  applicable
        regulation of  the Securities  and Exchange  Commission or  other
        body having  jurisdiction  in  the  premises  shall  require  the
        Company, Subsidiary  or  the  Optionee  to  take  any  action  in
        connection with  shares  being  purchased upon  exercise  of  the
        option, exercise of the option and delivery of the certificate or
        certificates for such shares shall be postponed until  completion
        of the necessary action,  which shall be  taken at the  Company's
        expense.

        9.   Transferability

             Except as may be  authorized by the  Committee , in its sole
        discretion, no  Option   may be transferred other than by will or
        the laws of  descent and  distribution, and  during a  Optionee's
        lifetime an option    requiring exercise  may be exercised  only by
        him or her (or in the event of incapacity, the person or  persons
        properly appointed to act on his or her behalf). The Committee   
        may, in its  discretion, determine  the extent  to which  options
        granted to an Optionee shall be transferable, and such provisions
        permitting or acknowledging  transfer shall be  set forth in  the
        written agreement evidencing the option executed and delivered by
        or on behalf of the Company and the Optionee.

        10.  Vesting, Restrictions and Termination of Options

             The Committee,  in its  sole discretion,  may determine  the
        manner in which options shall vest, the rights of the Company  to
        repurchase the shares issued upon the exercise of any option  and
        the manner in which such rights  shall lapse, and the terms  upon
        which any option granted shall terminate.  The Board of Directors
        shall have the right  to accelerate the date  of exercise of  any
        installment  or  to  accelerate   the  lapse  of  the   Company's
        repurchase rights.   All of such  terms shall be  specified in  a
        written option agreement executed and  delivered by or on  behalf
        of the Company  and the  Optionee to  whom such  option shall  be
        granted.

        11.  Adjustment of Number of Shares

             Each stock option agreement shall provide that in the  event
        of any stock dividend payable in the Common Stock or any split-up
        or contraction  in  the number  of  shares of  the  Common  Stock
        occurring after  the  date of  the  agreement and  prior  to  the
        exercise in full of  the option, the number  of shares for  which
        the option may thereafter  be exercised shall be  proportionately
        adjusted and the price to be  paid for each share subject to  the
        option shall be  proportionately adjusted.   Each such  agreement
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<PAGE>
        shall also provide that in case of any reclassification or change
        of outstanding  shares of  the Common  Stock or  in case  of  any
        consolidation or  merger  of  Subsidiary  with  or  into  another
        company or in case of any  sale or conveyance to another  company
        or  entity  of  the  property   of  Subsidiary  as  a  whole   or
        substantially as a  whole, the Optionee  shall, upon exercise  of
        the option,  be entitled  to  receive shares  of stock  or  other
        securities in its  place equivalent  in kind and  value to  those
        shares which  he would  have  received if  he had  exercised  the
        option  in  full  immediately  prior  to  such  reclassification,
        change,  consolidation,  merger,  sale  or  conveyance  and   had
        continued to hold the shares subject to the option (together with
        all other  shares,  stock  and securities  thereafter  issued  in
        respect thereof)  to the  time  of the  exercise of  the  option;
        provided , that if any recapitalization is to be effected  through
        an increase  in the  par value  of the  Common Stock  without  an
        increase in  the number  of authorized  shares and  such new  par
        value will  exceed the  option price  under such  agreement,  the
        Company   shall   notify   the   Optionee   of   such    proposed
        recapitalization, and  the Optionee  shall then  have the  right,
        exercisable at any time  prior to such recapitalization  becoming
        effective, to purchase all  of the shares  subject to the  option
        which  he  has  not  theretofore  purchased  (anything  in   such
        agreement to the contrary  notwithstanding), but if the  Optionee
        fails to exercise such right before such recapitalization becomes
        effective,  the  option  price  under  such  agreement  shall  be
        appropriately  adjusted.    Each  such  agreement  shall  further
        provide that upon dissolution  or liquidation of Subsidiary,  the
        option shall  terminate, but  the  Optionee (if  at the  time  an
        employee or director of the Company and/or any one or more of its
        subsidiaries) shall  have the  right, immediately  prior to  such
        dissolution or liquidation,  to exercise the  option to the  full
        extent not theretofore exercised; that no adjustment provided for
        above shall apply to any share  with respect to which the  option
        has  been  exercised  prior  to   the  effective  date  of   such
        adjustment; and that no fraction of a share or fractional  shares
        shall be purchasable or deliverable under such agreement, but  in
        the event  any  adjustment thereunder  of  the number  of  shares
        covered by  the  option shall  cause  such number  to  include  a
        fraction of  a share,  such  fraction shall  be adjusted  to  the
        nearest smaller whole number of shares.  In the event of  changes
        in the outstanding Common Stock by reason of any stock  dividend,
        split-up, contraction, reclassification, or change of outstanding
        shares of the  Common Stock  of the nature  contemplated by  this
        paragraph 11, the number of shares of Common Stock available  for
        the purpose of the Plan as stated in paragraph 3 hereof shall  be
        correspondingly adjusted by the Committee.

        12.  Limitation of Rights in Option Stock

             The Optionees  shall  have  no  rights  as  stockholders  in
        respect of shares as to which  their options shall not have  been
        exercised, certificates  issued  and  delivered  and  payment  as
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        herein provided  made in  full,  and shall  have no  rights  with
        respect to such shares not expressly conferred by this Plan.

        13.  Stock Reserved

             The Company  shall  at all  times  during the  term  of  the
        options reserve and keep available  such number of shares of  the
        Common Stock as will be sufficient to satisfy the requirements of
        this Plan and shall pay  all other fees and expenses  necessarily
        incurred by the Company in connection therewith.

        14.  Securities Laws Restrictions

             Each Optionee exercising  an option, at  the request of  the
        Company, will  be  required  to give  a  representation  in  form
        satisfactory  to  counsel  for  the  Company  that  he  will  not
        transfer, sell or otherwise dispose  of the shares received  upon
        exercise of  the  option  at  any time  purchased  by  him,  upon
        exercise of any portion  of the option, in  a manner which  would
        violate  the  Securities  Act  of  1933,  as  amended,  and   the
        regulations of the Securities and Exchange Commission  thereunder
        and the Company  may, if required  or at its  discretion, make  a
        notation on any certificates issued  upon exercise of options  to
        the effect that  such certificate may  not be transferred  except
        after  receipt  by   the  Company  of   an  opinion  of   counsel
        satisfactory to  it to  the effect  that such  transfer will  not
        violate such Act and such regulations.

        15.  Tax Withholding

             The Company shall have the right to deduct from payments  of
        any kind otherwise due to an Optionee any federal, state or local
        taxes of any kind required by law to be withheld with respect  to
        any shares issued upon  exercise of options  under the Plan  (the
        "withholding requirements").  The  Committee will have the  right
        to require that the Optionee or other appropriate person remit to
        the Company  an  amount  sufficient to  satisfy  the  withholding
        requirements, or  make  other arrangements  satisfactory  to  the
        Committee with regard to such requirements, prior to the delivery
        of any Common Stock pursuant to exercise of an option.  If and to
        the extent that such withholding  is required, the Committee  may
        permit the Optionee or  such other person to  elect at such  time
        and in such manner as the Committee provides to have the  Company
        hold back from the shares to  be delivered, or to deliver to  the
        Company, Common Stock  having a value  calculated to satisfy  the
        withholding requirements.

        16.  Termination and Amendment of Plan

             The Board of  Directors may at  any time, and  from time  to
        time, modify or amend the Plan in any respect, except that if  at
        any time  the approval  of  the Stockholders  of the  Company  is
        required as to such modification  or amendment under Rule  16b-3,
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<PAGE>
        the Board  of  Directors  may not  effect  such  modification  or
        amendment without such approval.

             The termination or any modification or amendment of the Plan
        shall not, without the consent of an Optionee, affect his or  her
        rights under an option  previously granted to him  or her.   With
        the consent of the Optionees affected, the Board of Directors may
        amend outstanding option agreements in a manner not  inconsistent
        with the Plan.   The Board of Directors  shall have the right  to
        amend or modify the terms and  provisions of the Plan and of  any
        outstanding  option  to  the  extent  necessary  to  ensure   the
        qualification of the Plan under Rule 16b-3.

             Notwithstanding any other provisions hereof, the Plan  shall
        terminate on December 31,  2008   and no options  shall be granted
        hereunder thereafter.




                                                EXHIBIT 10.35

              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 5th day of
        December, 1997 by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
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        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
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             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.
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        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
PAGE
<PAGE>
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


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


                                      THERMO OPTEK CORPORATION 


                                      By:  /s/ Robert J. Rosenthal
                                           Robert J. Rosenthal
                                      Title:    President



                                                EXHIBIT 10.36

              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 3rd day of
        December, 1997 by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
PAGE
<PAGE>
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
PAGE
<PAGE>
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.
PAGE
<PAGE>
        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
PAGE
<PAGE>
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


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


                                      THERMOQUEST CORPORATION 


                                      By:  /s/ Richard W. K. Chapman
                                           Richard W. K. Chapman
                                      Title:    President




                                                EXHIBIT 10.37

              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 3rd day of
        December, 1997 by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
PAGE
<PAGE>
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
PAGE
<PAGE>
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.
PAGE
<PAGE>
        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
PAGE
<PAGE>
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


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


                                      METRIKA SYSTEMS CORPORATION 


                                      By:  /s/ Ernesto A. Corte
                                           Ernesto A. Corte
                                      Title:    President





                                                EXHIBIT 10.38

                         MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT  is  entered  into  as of  the  14th   day of
        November, 1997  by and  among Thermo  Electron    Corporation  (the
        "Parent") and  those  of  its  subsidiaries  that    join  in  this
        Agreement by executing the  signature page hereto (the  "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS,  the          Majority  Owned   Subsidiaries
        wholly-owned subsidiaries wish to enter  into   various financial
        transactions, such as convertible or nonconvertible debt,  loans,
        and equity  offerings, and  other contractual  arrangements  with
        third parties   (the "Underlying  Obligations") and  may  provide
        credit support to,   on behalf of  or for  the benefit  of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the  Majority  Owned Subsidiaries  and  the  Parent
        acknowledge  that  the  Majority  Owned  Subsidiaries  and  their
        wholly-owned subsidiaries  may be unable to enter into many kinds
        of  Underlying   Obligations  without   a  guarantee   of   their
        performance thereunder from the Parent (a "Parent Guarantee")  or
        without obtaining Credit Support Obligations from other  Majority
        Owned Subsidiaries;

             WHEREAS,  the   Majority   Owned  Subsidiaries    and  their
        wholly-owned subsidiaries   may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS,  certain Majority  Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ")  may themselves be majority  owned
        subsidiaries of other  Majority Owned  Subsidiaries ("First  Tier
        Majority Owned Subsidiaries");

             WHEREAS,  for various reasons, Parent Guarantees of a Second
        Tier Majority Owned  Subsidiary's Underlying  Obligations may  be
        demanded and  given without  the respective  First Tier  Majority
        Owned Subsidiary  also issuing  a  guarantee of  such  Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit  to  a  Second  Tier  Majority  Owned  Subsidiary  or  its
        wholly-owned   subsidiaries   under   circumstances   where   the
        applicable First Tier Majority Owned Subsidiary does not  provide
        such credit; and
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             WHEREAS,   the Parent  is willing to consider  continuing to
        issue Parent Guarantees  and providing  credit, and the  Majority
        Owned Subsidiaries  are willing to consider continuing to provide
        Credit Support Obligations and to borrow funds, on the terms  and
        conditions set forth below;

             NOW, THEREFORE,  in consideration of the foregoing and other
        good and valuable consideration,  the receipt and sufficiency  of
        which are   hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If  he Parent provides a  Parent Guarantee of an  Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee,  or the Parent performs  under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary  that  is  obligated,  either  directly  or
             indirectly through  a  wholly-owned subsidiary,  under  such
             Underlying Obligation shall indemnify and save harmless  the
             Parent  from  any   liability,  cost,   expense  or   damage
             (including  reasonable  attorneys'  fees)  suffered  by  the
             Parent as  a  result  of  the  Parent  Guarantee.    If  the
             Underlying Obligation is  issued by a  Second Tier  Majority
             Owned Subsidiary or a  wholly-owned subsidiary thereof,  and
             such Second  Tier Majority  Owned  Subsidiary is  unable  to
             fully indemnify the  Parent (because of  the poor  financial
             condition of such Second Tier Majority Owned  Subsidiary, or
             for any other  reason), then the  First Tier Majority  Owned
             Subsidiary that  owns  the majority  of  the stock  of  such
             Second Tier Majority  Owned Subsidiary  shall indemnify  and
             save harmless the Parent from any remaining liability, cost,
             expense or  damage  (including reasonable  attorneys'  fees)
             suffered by the Parent as a result of the Parent  Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned  subsidiary
             thereof  provides  a  Credit  Support  Obligation  for   any
             subsidiary of the  Parent, other than  a subsidiary of  such
             Majority Owned Subsidiary, and  the beneficiary(ies) of  the
             Credit  Support  Obligation   enforce  the  Credit   Support
             Obligation,  or  the  Majority   Owned  Subsidiary   or  its
             wholly-owned subsidiary performs   under the Credit  Support
             Obligation for  any  other  reason, then  the  Parent  shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its  wholly-owned  subsidiary,   as  applicable,  from   any
             liability, cost,  expense  or damage  (including  reasonable
             attorneys' fees) suffered by  the Majority Owned  Subsidiary
             or its wholly-owned subsidiary,  as applicable, as a  result
             of the  Credit Support  Obligation.   Without  limiting  the
             foregoing, Credit Support Obligations include the deposit of
             funds by  a  Majority  Owned Subsidiary  or  a  wholly-owned
             subsidiary thereof in  a credit arrangement  with a  banking
             facility  whereby such  funds are  available to  the banking
             facility as collateral  for overdraft  obligations of  other
             Majority  Owned  Subsidiaries  or  their  subsidiaries  also
             participating in the  credit arrangement  with such  banking
             facility.
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        2.   For purposes of this  Agreement, the term "guarantee"  shall
             include not only  a formal guarantee  of an obligation,  but
             also any other  arrangement where the  Parent is liable  for
             the obligations  of  a  Majority  Owned  Subsidiary   or its
             wholly-owned subsidiarie s.  Such other arrangements include
             (a) representations,  warranties and/or  covenants or  other
             obligations joined in by the  Parent, whether on a joint  or
             joint and several  basis, for  the benefit  of the  Majority
             Owned Subsidiary or its wholly-owned subsidiarie   s and (b)
             responsibility of the Parent by  operation of  law for  the
             acts and omissions of the Majority Owned Subsidiary  or its
             wholly-owned  subsidiaries,  including  controlling  person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a  Parent Guarantee  is  seeking to  enforce such  Parent
             Guarantee,  the  Parent  shall  notify  the  Majority  Owned
             Subsidiary(s)  obligated,  either  directly  or   indirectly
             through  a  wholly-owned  subsidiary,  under  the   relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof,  as applicable,  shall have
             the right, at its own expense, to contest the claim of  such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable,  is contesting the  claim
             of such beneficiary, the Parent  will not perform under  the
             relevant Parent Guarantee unless and until, in the  Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such  Parent  Guarantee  to  perform.    Subject  to  the
             foregoing, any dispute between  a Majority Owned  Subsidiary
             or wholly-owned  subsidiary thereof,  as applicable,   and  a
             beneficiary of  a Parent  Guarantee  shall not  affect  such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent  hereunder.    Promptly after  a  Majority  Owned
             Subsidiary or   wholly-owned   subsidiary   thereof,   as
             applicable,  receives notice that a beneficiary of a  Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned  Subsidiary shall notify  the
             Parent.   The  Parent  shall  have the  right,  at  its  own
             expense, to contest the claim  of such beneficiary .  If the
             Parent or the subsidiary of  the Parent on whose behalf  the
             Credit Support Obligation is  given is contesting the  claim
             of  such  beneficiary,  the  Majority  Owned  Subsidiary  or
             wholly-owned subsidiary  thereof,  as applicable,  will  not
             perform under the relevant Credit Support Obligation  unless
             and until,  in the  Majority Owned  Subsidiary's  reasonable
             judgment, the  Majority  Owned  Subsidiary   or wholly-owned
             subsidiary thereof, as  applicable,   is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the  foregoing, any  dispute between  the Parent  or  the
             subsidiary of the Parent on whose behalf the Credit  Support
             Obligation was given, on the one hand, and a beneficiary  of
             a Credit Support Obligation, on the other, shall not  affect
             the Parent's obligation to  promptly indemnify the  Majority
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             Owned  Subsidiary   or  its   wholly-owned  subsidiary,   as
             applicable, hereunder.  

        4.   Upon the request of a Majority Owned Subsidiary, the  Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiarie s on a short-term, revolving
             credit basis, from time to time in such amounts as  mutually
             determined by the Parent and the Majority Owned  Subsidiary.
             The aggregate principal  amount of such  loans and  advances
             shall be reflected on the books and records of the  Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on  an
             unsecured basis  unless specifically  provided otherwise  in
             loan documents executed  at that time.  The  Majority Owned
             Subsidiary  or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal  amount
             of such  loans  from time  to  time outstanding  at  a  rate
             ("Interest Rate") equal to the rate of the Commercial  Paper
             Composite Rate for 90-day maturities as reported by  Merrill
             Lynch Capital  Markets,  as  an average  of  the  last  five
             business days  of such  Majority Owned  Subsidiary's  latest
             fiscal quarter  then  ended,  plus  twenty-five  (25)  basis
             points.  The Interest  Rate shall be  adjusted on the  first
             business day of each fiscal  quarter of such Majority  Owned
             Subsidiary pursuant to the  Interest Rate formula  contained
             in the preceding  sentence and  shall be in  effect for  the
             entirety of such fiscal quarter.  Interest shall be computed
             on  a 360-day  basis.    The  aggregate  principal  amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and  accrued interest may be paid  by
             the  Majority  Owned  Subsidiaries  or  their   wholly-owned
             subsidiaries, as applicable,  at any  time or  from time  to
             time, in whole or in part, without premium or penalty.   All
             payments shall be applied first to accrued interest and then
             to principal.   Principal and interest  shall be payable  in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as  the Parent may  designate from time  to
             time in  writing  to the  Majority  Owned Subsidiary.    The
             unpaid principal amount of any such borrowings, and  accrued
             interest thereon, shall become immediately due and  payable,
             without demand,  upon  the  failure of  the  Majority  Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its  debts as  they become  due, the  insolvency of  the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the  filing by  or  against the  Majority  Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S.  Bankruptcy Code (or the  filing
             of any  similar petition  under the  insolvency law  of  any
             jurisdiction),  or  the   making  by   the  Majority   Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect  to,  or  the  taking by  any  such  person  of
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             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable .  In case any
             payments of principal  and interest shall  not be paid  when
             due, the  Majority  Owned  Subsidiary   or its  wholly-owned
             subsidiary, as applicable,  further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary , the
             First Tier Majority Owned Subsidiary that owns the  majority
             of the stock of such  Second Tier Majority Owned  Subsidiary
             hereby   guarantees   the   Second   Tier   Majority   Owned
             Subsidiary's obligations  to  the  Parent thereunder.   Such
             guaranty shall be  enforced only  after the  Parent, in  its
             reasonable  judgment,  determines   that  the  Second   Tier
             Majority Owned  Subsidiary  is unable to  fully perform  its
             obligations under  the  Credit  Extension.   If  the  Parent
             provides Credit Extension to a wholly-owned subsidiary of  a
             Second Tier  Majority  Owned  Subsidiary,  the  Second  Tier
             Majority Owned Subsidiary hereby guarantees it  wholly-owned
             subsidiary's obligations to  the Parent  thereunder and  the
             First Tier Majority Owned Subsidiary that owns the  majority
             of the stock of such  Second Tier Majority Owned  Subsidiary
             hereby   guarantees   the   Second   Tier   Majority   Owned
             Subsidiary's obligations  to  the Parent  hereunder.    Such
             guaranty by the First  Tier Majority Owned Subsidiary  shall
             be  enforced  only  after  the  Parent,  in  its  reasonable
             judgment, determines  that the  Second Tier  Majority  Owned
             Subsidiary  is  unable   to  fully   perform  its   guaranty
             obligation hereunder.  

        6.   All payments  required  to  be  made  by  a  Majority  Owned
             Subsidiary or its wholly-owned subsidiaries, as  applicable,
             shall be made within two  days after receipt of notice  from
             the Parent. All payments required  to be made by the  Parent
             shall be made   within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This  Agreement  shall  be  governed  by  and  construed  in
             accordance  with   the   laws   of   the   Commonwealth   of
             Massachusetts applicable  to  contracts made  and  performed
             therein.
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             IN WITNESS WHEREOF, the  parties have caused this  Agreement
        to be executed by their duly  authorized officers as of the  date
        first above written.


                                      THERMO ELECTRON CORPORATION


                                      By:  /s/John N. Hatsopoulos
                                           ------------------------------

                                      Title:    President


                                      THERMO VISION CORPORATION 


                                      By:  /s/Kristine Stotz Langdon
                                           ------------------------------

                                      Title:    President




                                                EXHIBIT 10.39


              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 2nd day of
        December, 1997, by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
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        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
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             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.
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        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
PAGE
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             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
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<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


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

                                      Title:    Treasurer


                                      THERMO BIOANALYSIS CORPORATION


                                      By:  /s/ Barry S. Howe
                                           ------------------------------

                                      Title:    President 




                                                        Exhibit 10.40


              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT


             This AGREEMENT is entered into as of the 4th day of
        December, 1997, by and among Thermo Electron Corporation (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").

                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis;

             WHEREAS, certain Majority Owned Subsidiaries ("Second Tier
        Majority Owned Subsidiaries ") may themselves be majority owned
        subsidiaries of other Majority Owned Subsidiaries ("First Tier
        Majority Owned Subsidiaries");

             WHEREAS, for various reasons, Parent Guarantees of a Second
        Tier Majority Owned Subsidiary's Underlying Obligations may be
        demanded and given without the respective First Tier Majority
        Owned Subsidiary also issuing a guarantee of such Underlying
        Obligation; 

             WHEREAS, the Parent may itself make a loan or provide other
        credit to a Second Tier Majority Owned Subsidiary or its
        wholly-owned subsidiaries under circumstances where the
        applicable First Tier Majority Owned Subsidiary does not provide
        such credit; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
PAGE
<PAGE>
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
             Parent as a result of the Parent Guarantee.  If the
             Underlying Obligation is issued by a Second Tier Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof, and
             such Second Tier Majority Owned Subsidiary is unable to
             fully indemnify the Parent (because of the poor financial
             condition of such Second Tier Majority Owned Subsidiary, or
             for any other reason), then the First Tier Majority Owned
             Subsidiary that owns the majority of the stock of such
             Second Tier Majority Owned Subsidiary shall indemnify and
             save harmless the Parent from any remaining liability, cost,
             expense or damage (including reasonable attorneys' fees)
             suffered by the Parent as a result of the Parent Guarantee.
             If a Majority Owned Subsidiary or a wholly-owned subsidiary
             thereof provides a Credit Support Obligation for any
             subsidiary of the Parent, other than a subsidiary of such
             Majority Owned Subsidiary, and the beneficiary(ies) of the
             Credit Support Obligation enforce the Credit Support
             Obligation, or the Majority Owned Subsidiary or its
             wholly-owned subsidiary  performs under the Credit Support
             Obligation for any other reason, then the Parent shall
             indemnify and save harmless the Majority Owned Subsidiary or
             its wholly-owned subsidiary, as applicable, from any
             liability, cost, expense or damage (including reasonable
             attorneys' fees) suffered by the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable, as a result
             of the Credit Support Obligation.  Without limiting the
             foregoing, Credit Support Obligations include the deposit of
             funds by a Majority Owned Subsidiary or a wholly-owned
             subsidiary thereof in a credit arrangement with a banking
             facility whereby such funds are available to the banking
             facility as collateral for overdraft obligations of other
             Majority Owned Subsidiaries or their subsidiaries also
             participating in the credit arrangement with such banking
             facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
PAGE
<PAGE>
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.
PAGE
<PAGE>
        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
PAGE
<PAGE>
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   If the Parent makes a loan or provides other credit ("Credit
             Extension") to a Second Tier Majority Owned Subsidiary, the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent thereunder.  Such
             guaranty shall be enforced only after the Parent, in its
             reasonable judgment, determines that the Second Tier
             Majority Owned Subsidiary is unable to fully perform its
             obligations under the Credit Extension.  If the Parent
             provides Credit Extension to a wholly-owned subsidiary of a
             Second Tier Majority Owned Subsidiary, the Second Tier
             Majority Owned Subsidiary hereby guarantees it wholly-owned
             subsidiary's obligations to the Parent thereunder and the
             First Tier Majority Owned Subsidiary that owns the majority
             of the stock of such Second Tier Majority Owned Subsidiary
             hereby guarantees the Second Tier Majority Owned
             Subsidiary's obligations to the Parent hereunder.  Such
             guaranty by the First Tier Majority Owned Subsidiary shall
             be enforced only after the Parent, in its reasonable
             judgment, determines that the Second Tier Majority Owned
             Subsidiary is unable to fully perform its guaranty
             obligation hereunder.  

        6.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        7.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.
PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO ELECTRON CORPORATION


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


                                      Title:    Treasurer


                                      THERMOSPECTRA CORPORATION


                                      By:  /s/ Theo Melas-Kyriazi
                                           ------------------------------


                                      Title:    President 






                                                                   Exhibit 13




















                         THERMO INSTRUMENT SYSTEMS INC.

                        Consolidated Financial Statements

                                      1997
PAGE
<PAGE>
  Thermo Instrument Systems Inc.                     1997 Financial Statements

                        Consolidated Statement of Income

  (In thousands except per share amounts)     1997         1996          1995
  ---------------------------------------------------------------------------
  Revenues (Note 14)                    $1,592,314   $1,209,362    $  782,662
                                        ----------   ----------    ----------

  Costs and Operating Expenses:
    Cost of revenues                       842,009      654,165       403,443
    Selling, general, and administrative
      expenses (Note 9)                    424,695      340,963       220,436
    Research and development expenses      107,613       84,091        54,314
    Nonrecurring (income) expense, net
      (Notes 4 and 12)                      (1,257)       3,500             -
                                        ----------   ----------    ----------
                                         1,373,060    1,082,719       678,193
                                        ----------   ----------    ----------
  Operating Income                         219,254      126,643       104,469

  Interest Income                           28,253       20,490        14,646
  Interest Expense (includes $18,014, 
    $8,145, and $5,512 to parent
    company)                               (45,894)     (28,923)      (18,129)
  Gain on Issuance of Stock by
    Subsidiaries (Note 11)                  46,404       71,713        20,128
  Gain on Sale of Related-party
    Investments (Note 9)                         -            -         2,227
                                        ----------   ----------    ----------
  Income Before Provision for Income
    Taxes and Minority Interest
    Expense                                248,017      189,923       123,341
  Provision for Income Taxes (Note 6)       88,113       51,727        42,713
  Minority Interest Expense                 12,646        5,445         1,322
                                        ----------   ----------    ----------
  Net Income                            $  147,258   $  132,751    $   79,306
                                        ==========   ==========    ==========
  Earnings per Share (Note 15):
    Basic                               $     1.21   $     1.12    $      .70
                                        ==========   ==========    ==========
    Diluted                             $     1.09   $     1.01    $      .64
                                        ==========   ==========    ==========
  Weighted Average Shares (Note 15):
    Basic                                  121,548      118,857       113,222
                                        ==========   ==========    ==========
    Diluted                                139,415      135,351       133,291
                                        ==========   ==========    ==========

  The accompanying notes are an integral part of these consolidated
  financial statements.

                                        2PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                           Consolidated Balance Sheet

    (In thousands)                                         1997         1996
    ------------------------------------------------------------------------
    Assets
    Current Assets:
     Cash and cash equivalents                       $  468,848   $  522,688
     Available-for-sale investments, at quoted
        market value (amortized cost of $8,287 and
        $7,430; Note 2)                                   8,328        7,452
     Accounts receivable, less allowances of
       $22,786 and $16,981                              364,075      303,331
     Unbilled contract costs and fees                     9,191        6,043
     Inventories                                        264,719      213,683
     Prepaid expenses                                    19,292       13,417
     Prepaid income taxes (Note 6)                       54,915       58,296
                                                     ----------   ----------
                                                      1,189,368    1,124,910
                                                     ----------   ----------
    Property, Plant, and Equipment, at Cost, Net        219,939      178,663
                                                     ----------   ----------
    Other Assets (Note 5)                                45,477       32,454
                                                     ----------   ----------
    Cost in Excess of Net Assets of Acquired
      Companies (Notes 4 and 6)                         896,369      588,373
                                                     ----------   ----------
                                                     $2,351,153   $1,924,400
                                                     ==========   ==========










                                        3PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Consolidated Balance Sheet (continued)

   (In thousands except share amounts)                    1997         1996
   ------------------------------------------------------------------------
   Liabilities and Shareholders' Investment
   Current Liabilities:
     Notes payable and current maturities of
       long-term obligations (includes $55,000 due
       to parent company in 1997; Notes 4 and 7)    $  116,226   $   91,584
     Accounts payable                                   97,516       83,161
     Accrued payroll and employee benefits              59,745       51,728
     Accrued income taxes (includes $20,000 and 
        $10,839 due to parent company)                  61,409       39,686
     Accrued installation and warranty expenses         42,404       44,211
     Accrued acquisition expenses (Note 4)              33,789       30,025
     Deferred revenue                                   41,759       35,959
     Other accrued expenses                            101,827       99,524
     Due to parent company and affiliated 
       companies (Note 4)                               22,027       12,329
                                                    ----------   ----------
                                                       576,702      488,207
                                                    ----------   ----------
   Deferred Income Taxes (Note 6)                       30,430       20,710
                                                    ----------   ----------
   Other Deferred Items                                 27,273       29,805
                                                    ----------   ----------

   Long-term Obligations (Notes 7 and 17):
     Senior convertible obligations (includes
       $140,000 due to parent company)                 327,824      334,781
     Subordinated convertible obligations              160,547      192,500
     Other (includes $169,000 and $15,000 due to
       parent company; Note 4)                         184,823       26,933
                                                    ----------   ----------
                                                       673,194      554,214
                                                    ----------   ----------
   Minority Interest                                   165,996       85,197
                                                    ----------   ----------
   Commitments and Contingencies (Note 8)

   Shareholders' Investment (Notes 5 and 10):
     Common stock, $.10 par value, 250,000,000
       shares authorized; 122,645,040 and
       97,674,228 shares issued                         12,265        9,767
     Capital in excess of par value                    333,580      319,464
     Retained earnings                                 571,899      424,641
     Treasury stock at cost, 670,827 and 750,055
       shares                                           (6,965)      (8,679)
     Cumulative translation adjustment                 (33,257)       1,060
     Net unrealized gain on available-for-sale
       investments (Note 2)                                 36           14
                                                    ----------   ----------
                                                       877,558      746,267
                                                    ----------   ----------
                                                    $2,351,153   $1,924,400
                                                    ==========   ==========

   The accompanying notes are an integral part of these consolidated
   financial statements. 
                                        4PAGE
<PAGE>
   Thermo Instrument Systems Inc.                    1997 Financial Statements

                      Consolidated Statement of Cash Flows

   (In thousands)                                1997        1996        1995
   --------------------------------------------------------------------------
   Operating Activities:
     Net income                             $ 147,258   $ 132,751   $  79,306
     Adjustments to reconcile net income
       to net cash provided by
       operating activities:
         Depreciation and amortization         54,993      44,233      25,257
         Provision for losses on
           accounts receivable                  4,366       2,274       2,543
         Nonrecurring (income) expense, net
           (Notes 4 and 12)                    (1,257)      3,500           -
         Gain on issuance of stock by
           subsidiaries (Note 11)             (46,404)    (71,713)    (20,128)
         Gain on sale of related-party 
           investments (Note 9)                     -           -      (2,227)
         Minority interest expense             12,646       5,445       1,322
         Increase (decrease) in deferred
           income taxes                         2,742        (757)      2,196
         Other noncash expenses                 6,158       4,889       2,964
         Changes in current accounts,
           excluding the effects of
           acquisitions:
             Accounts receivable              (19,157)      1,394     (22,661)
             Inventories                       13,768      14,184      (7,433)
             Other current assets               3,547       3,978       3,058
             Accounts payable                  14,317      (9,903)      1,202
             Other current liabilities        (23,868)    (24,686)    (12,552)
         Other                                    205         290        (313)
                                            ---------   ---------   ---------
   Net cash provided by operating 
     activities                               169,314     105,879      52,534
                                            ---------   ---------   ---------
   Investing Activities:
     Acquisitions, net of cash acquired
       (Note 4)                              (508,059)   (248,150)    (89,469)
     Refund of acquisition purchase price
       (Note 4)                                36,132           -           -
     Proceeds from sale of businesses
       (Notes 3 and 12)                         4,980           -      34,267
     Purchases of available-for-sale
       investments                             (9,000)    (10,250)          -
     Proceeds from sale and maturities of
       available-for-sale investments          10,250       3,000      17,825
     Purchases of property, plant, and
       equipment                              (29,198)    (19,134)    (10,313)
     Proceeds from sale of property,
       plant, and equipment                     7,877       4,597       2,252
     Other                                      2,030         530      (1,691)
                                            ---------   ---------   ---------
   Net cash used in investing activities    $(484,988)  $(269,407)  $ (47,129)
                                            ---------   ---------   ---------
                                        5PAGE
<PAGE>
   Thermo Instrument Systems Inc.                   1997 Financial Statements

                Consolidated Statement of Cash Flows (continued)

   (In thousands)                               1997        1996       1995
   ------------------------------------------------------------------------
   Financing Activities:
     Net proceeds from issuance of
       Company and subsidiary common
       stock (Note 11)                     $  91,375   $ 127,024  $  41,788
     Net proceeds from issuance of
       long-term obligations                       -     168,850    187,846
     Proceeds from issuance of short- and
       long-term obligations to parent
       company (Note 7)                      428,800     110,000     15,000
     Repayment of short- and long-term
       obligations to parent company 
       (Note 7)                             (220,000)    (95,000)   (15,000)
     Increase (decrease) in short-term
       obligations, net                      (21,528)    (12,770)     7,584
     Repayment of long-term obligations       (7,817)     (5,133)    (1,373)
                                           ---------   ---------  ---------
   Net cash provided by financing
     activities                              270,830     292,971    235,845
                                           ---------   ---------  ---------
   Exchange Rate Effect on Cash               (8,996)     (1,988)     1,050
                                           ---------   ---------  ---------
   Increase (Decrease) in Cash and
     Cash Equivalents                        (53,840)    127,455    242,300
   Cash and Cash Equivalents at
     Beginning of Year                       522,688     395,233    152,933
                                           ---------   ---------  ---------
   Cash and Cash Equivalents at End
     of Year                               $ 468,848   $ 522,688  $ 395,233
                                           =========   =========  =========

   Cash Paid For:
     Interest                              $  43,755   $  25,837  $  16,035
     Income taxes                          $  62,895   $  42,636  $  31,529
   Noncash Activities:
     Conversions of Company and subsidiary
       convertible obligations             $  38,910   $  67,594  $  18,321

     Fair value of assets of 
       acquired companies                  $ 673,382   $ 487,218  $ 161,985
     Cash paid for acquired companies       (545,303)   (258,785)   (93,004)
     Due to affiliated company for 
       acquired company                      (19,117)          -          -
     Issuance of subsidiary stock
       options for acquired company           (1,693)          -          -
                                           ---------   ---------  ---------
         Liabilities assumed of acquired
           companies                       $ 107,269   $ 228,433  $  68,981
                                           =========   =========  =========

   The accompanying notes are an integral part of these consolidated
   financial statements.
                                        6PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

               Consolidated Statement of Shareholders' Investment

    (In thousands)                              1997        1996       1995
    ------------------------------------------------------------------------
    Common Stock, $.10 Par Value
        Balance at beginning of year        $  9,767    $  9,257   $  4,816
        Issuance of stock under employees'
          and directors' stock plans               4           5          1
        Conversions of convertible 
          obligations                             45         505        160
        Effect of stock splits                 2,449           -      4,280
                                            --------    --------   --------
        Balance at end of year                12,265       9,767      9,257
                                            --------    --------   --------

    Capital in Excess of Par Value
        Balance at beginning of year         319,464     248,468    233,765
        Issuance of stock under employees'
          and directors' stock plans           1,270         950     (1,023)
        Tax benefit related to employees'
          and directors' stock plans             514         199      1,950
        Conversions of convertible
          obligations                          6,817      65,924     17,814
        Effect of stock splits                (2,449)          -     (4,280)
        Effect of majority-owned
          subsidiaries' equity
          transactions                         7,964       3,923        242
                                            --------    --------   --------
        Balance at end of year               333,580     319,464    248,468
                                            --------    --------   --------

    Retained Earnings
        Balance at beginning of year         424,641     291,890    212,584
        Net income                           147,258     132,751     79,306
                                            --------    --------   --------
        Balance at end of year               571,899     424,641    291,890
                                            --------    --------   --------

    Treasury Stock
        Balance at beginning of year          (8,679)     (9,724)   (12,736)
        Activity under employees' and
          directors' stock plans               1,714       1,045      3,012
                                            --------    --------   --------
        Balance at end of year                (6,965)     (8,679)    (9,724)
                                            --------    --------   --------

    Cumulative Translation Adjustment
        Balance at beginning of year           1,060       2,814      1,991
        Translation adjustment               (34,317)     (1,754)       823
                                            --------    --------   --------
        Balance at end of year              $(33,257)   $  1,060   $  2,814
                                            --------    --------   --------



                                        7PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

         Consolidated Statement of Shareholders' Investment (continued)
                                 

    (In thousands)                             1997       1996        1995
    -----------------------------------------------------------------------

    Net Unrealized Gain on
      Available-for-sale Investments
        Balance at beginning of year       $     14   $      -    $    343
        Change in net unrealized gain
          on available-for-sale
          investments (Note 2)                   22         14        (343)
                                           --------   --------    --------
        Balance at end of year                   36         14           -
                                           --------   --------    --------
    Total Shareholders' Investment         $877,558   $746,267    $542,705
                                           ========   ========    ========


    The accompanying notes are an integral part of these consolidated
    financial statements.











                                        8PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies

    Nature of Operations
        Thermo Instrument Systems Inc. (the Company) develops, manufactures,
    and services instruments and software used for the identification and
    quantification of complex molecular compounds and elements in gases,
    liquids, and solids. Uses include pharmaceutical drug research and
    clinical diagnostics, monitoring and measuring environmental pollutants,
    industrial inspection, and test and control for quality assurance and
    productivity improvement. In addition, the Company develops,
    manufactures, markets, and services equipment for the measurement,
    preparation, storage, and automation of sample materials and photonics
    and vacuum components for original equipment manufacturers.

    Relationship with Thermo Electron Corporation
        The Company was incorporated on May 28, 1986, as a wholly owned
    subsidiary of Thermo Electron Corporation. As of January 3, 1998, Thermo
    Electron owned 99,819,138 shares of the Company's common stock,
    representing 82% of such stock outstanding.

    Principles of Consolidation
        The accompanying financial statements include the accounts of the
    Company; its wholly owned subsidiaries; its majority-owned public
    subsidiaries, ThermoSpectra Corporation, ThermoQuest Corporation, Thermo
    Optek Corporation, Thermo BioAnalysis Corporation, Metrika Systems
    Corporation, and Thermo Vision Corporation; and its majority-owned,
    privately held subsidiary, ONIX Systems Inc. All material intercompany
    accounts and transactions have been eliminated. The Company accounts for
    investments in businesses in which it owns between 20% and 50% using the
    equity method.

    Fiscal Year
        The Company has adopted a fiscal year ending the Saturday nearest
    December 31. References to 1997, 1996, and 1995 are for the fiscal years
    ended January 3, 1998, December 28, 1996, and December 30, 1995,
    respectively. Fiscal year 1997 included 53 weeks; 1996 and 1995 each
    included 52 weeks.

    Revenue Recognition
        The Company recognizes product revenues upon shipment of its products
    and recognizes service contract revenues ratably over the term of the
    contract. The Company provides a reserve for its estimate of warranty and
    installation costs at the time of shipment. Deferred revenue in the
    accompanying balance sheet consists primarily of unearned revenue on
    service contracts. Substantially all of the deferred revenue in the
    accompanying 1997 balance sheet will be recognized within one year.

    Gain on Issuance of Stock by Subsidiaries
        At the time a subsidiary sells its stock to unrelated parties at a
    price in excess of its book value, the Company's net investment in that
    subsidiary increases. If at that time the subsidiary is an operating

                                        9PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    entity, and not engaged principally in research and development, the
    Company records the increase as a gain.
        If gains have been recognized on issuances of a subsidiary's stock
    and shares of the subsidiary are subsequently repurchased by the
    subsidiary, the Company, or Thermo Electron, gain recognition does not
    occur on issuances subsequent to the date of a repurchase until such time
    as shares have been issued in an amount equivalent to the number of
    repurchased shares. Such transactions are reflected as equity
    transactions, and the net effect of these transactions is reflected in
    the accompanying statement of shareholders' investment as the effect of
    majority-owned subsidiaries' equity transactions.

    Stock-based Compensation Plans
        The Company applies Accounting Principles Board Opinion (APB) No. 25,
    "Accounting for Stock Issued to Employees" and related interpretations in
    accounting for its stock-based compensation plans (Note 5). Accordingly,
    no accounting recognition is given to stock options granted at fair
    market value until they are exercised. Upon exercise, net proceeds,
    including tax benefits realized, are credited to equity.

    Income Taxes
        The Company and Thermo Electron have a tax allocation agreement under
    which the Company and its greater than 80%-owned subsidiaries, exclusive
    of foreign operations, are included in Thermo Electron's consolidated
    federal and certain state income tax returns. The agreement provides that
    in years in which the Company has taxable income, it will pay to Thermo
    Electron amounts comparable to the taxes the Company would have paid if
    it had filed separate tax returns. If Thermo Electron's equity ownership
    of the Company were to drop below 80%, the Company would be required to
    file its own federal income tax return.
        In accordance with Statement of Financial Accounting Standards (SFAS)
    No. 109, "Accounting for Income Taxes," the Company recognizes deferred
    income taxes based on the expected future tax consequences of differences
    between the financial statement basis and the tax basis of assets and
    liabilities, calculated using enacted tax rates in effect for the year in
    which the differences are expected to be reflected in the tax return.

    Earnings per Share
        During the fourth quarter of 1997, the Company adopted SFAS No. 128,
    "Earnings per Share" (Note 15). As a result, all previously reported
    earnings per share have been restated. Basic earnings per share have been
    computed by dividing net income by the weighted average number of shares
    outstanding during the year. Diluted earnings per share have been
    computed assuming the conversion of convertible obligations and the
    elimination of the related interest expense, and the exercise of stock
    options, as well as their related income tax effects.

                                       10PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    Stock Split
        All share and per share information, except for share information in
    the accompanying 1996 balance sheet, has been restated to reflect a
    five-for-four stock split, effected in the form of a 25% stock dividend,
    which was distributed in October 1997.

    Cash and Cash Equivalents
        At year-end 1997 and 1996, $284.0 million and $459.1 million,
    respectively, of the Company's cash equivalents were invested in a
    repurchase agreement with Thermo Electron. Under this agreement, the
    Company in effect lends excess cash to Thermo Electron, which Thermo
    Electron collateralizes with investments principally consisting of
    corporate notes, commercial paper, U.S. government-agency securities,
    money market funds, and other marketable securities, in the amount of at
    least 103% of such obligation. The Company's funds subject to the
    repurchase agreement are readily convertible into cash by the Company.
    The repurchase agreement earns a rate based on the 90-day Commercial
    Paper Composite Rate plus 25 basis points, set at the beginning of each
    quarter. At year-end 1997 and 1996, the Company's cash equivalents also
    include investments in short-term certificates of deposit of the
    Company's foreign subsidiaries, which have an original maturity of three
    months or less. Cash equivalents are carried at cost, which approximates
    market value.

    Inventories
        Inventories are stated at the lower of cost (on a first-in, first-out
    or weighted average basis) or market value and include materials, labor,
    and manufacturing overhead. The components of inventories are as follows:

    (In thousands)                                          1997        1996
    ------------------------------------------------------------------------
    Raw materials and supplies                          $118,611    $ 95,920
    Work in process                                       52,870      47,518
    Finished goods                                        93,238      70,245
                                                        --------    --------
                                                        $264,719    $213,683
                                                        ========    ========

    Property, Plant, and Equipment
        The costs of additions and improvements are capitalized, while
    maintenance and repairs are charged to expense as incurred. The Company
    provides for depreciation and amortization using the straight-line method
    over the estimated useful lives of the property as follows: buildings and
    improvements, 5 to 40 years; machinery and equipment, 1 to 12 years; and
    leasehold improvements, the shorter of the term of the lease or the life
    of the asset.

                                       11PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

        Property, plant, and equipment consists of the following:

    (In thousands)                                          1997        1996
    ------------------------------------------------------------------------
    Land                                                $ 33,539    $ 31,048
    Buildings                                            123,533     101,761
    Machinery, equipment, and leasehold improvements     160,533     118,167
                                                        --------    --------
                                                         317,605     250,976
    Less: Accumulated depreciation and amortization       97,666      72,313
                                                        --------    --------
                                                        $219,939    $178,663
                                                        ========    ========

    Other Assets
        Other assets in the accompanying balance sheet includes the costs of
    acquired trademarks, patents, and other specifically identifiable
    intangible assets. These assets are amortized using the straight-line
    method over their estimated useful lives, which range from 3 to 20 years.
    These assets were $16.2 million and $15.5 million, net of accumulated
    amortization of $19.3 million and $16.2 million, at year-end 1997 and
    1996, respectively. Other assets in the accompanying 1997 balance sheet
    also includes prepaid pension costs (Note 5).

    Cost in Excess of Net Assets of Acquired Companies
        The excess of cost over the fair value of net assets of acquired
    companies is amortized using the straight-line method over periods not
    exceeding 40 years. Accumulated amortization was $78.0 million and $56.2
    million at year-end 1997 and 1996, respectively. The Company assesses the
    future useful life of this asset whenever events or changes in
    circumstances indicate that the current useful life has diminished. The
    Company considers the future undiscounted cash flows of the acquired
    companies in assessing the recoverability of this asset. If impairment
    has occurred, any excess of carrying value over fair value is recorded as
    a loss.

    Environmental Liabilities
        The Company accrues for costs associated with the remediation of
    environmental pollution when it is probable that a liability has been
    incurred and the Company's proportionate share of the amount can be
    reasonably estimated. Any recorded liabilities have not been discounted.

                                       12PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    Foreign Currency
        All assets and liabilities of the Company's foreign subsidiaries are
    translated at year-end exchange rates, and revenues and expenses are
    translated at average exchange rates for the year in accordance with SFAS
    No. 52, "Foreign Currency Translation." Resulting translation adjustments
    are reflected as a separate component of shareholders' investment titled
    "Cumulative translation adjustment." Foreign currency transaction gains
    and losses are included in the accompanying statement of income and are
    not material for the three years presented.

    Forward Contracts
        The Company uses short-term forward foreign exchange contracts to
    manage certain exposures to foreign currencies. The Company enters into
    forward foreign exchange contracts to hedge certain firm purchase and
    sale commitments denominated in currencies other than its subsidiaries'
    local currencies. These contracts principally hedge transactions
    denominated in U.S. dollars, British pounds sterling, Japanese yen,
    French francs, and German deutsche marks. The purpose of the Company's
    foreign currency hedging activities is to protect the Company's local
    currency cash flows related to these commitments from fluctuations in
    foreign exchange rates. Gains and losses arising from forward foreign
    exchange contracts are recognized as offsets to gains and losses
    resulting from the transactions being hedged. The Company does not enter
    into speculative foreign currency agreements.

    Use of Estimates
        The preparation of financial statements in conformity with generally
    accepted accounting principles requires management to make estimates and
    assumptions that affect the reported amounts of assets and liabilities,
    disclosure of contingent assets and liabilities at the date of the
    financial statements, and the reported amounts of revenues and expenses
    during the reporting period. Actual results could differ from those
    estimates.

    Presentation
        Certain amounts in 1996 and 1995 have been reclassified to conform to
    the presentation in the 1997 financial statements.

    2.  Available-for-sale Investments

        In accordance with SFAS No. 115 "Accounting for Certain Investments
    in Debt and Equity Securities," the Company's debt and marketable equity
    securities are considered available-for-sale investments in the
    accompanying balance sheet and are carried at market value, with the
    difference between cost and market value, net of related tax effects,
    recorded currently as a component of shareholders' investment titled "Net
    unrealized gain on available-for-sale investments." The aggregate market

                                       13PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    2.  Available-for-sale Investments (continued)

    value, cost basis, and gross unrealized gains of available-for-sale
    investments by major security type are as follows:

                                                                      Gross
                                              Market        Cost Unrealized
    (In thousands)                             Value       Basis      Gains
    ------------------------------------------------------------------------
    1997
    Corporate bonds                           $6,105      $6,091     $   14
    Equity securities                          2,083       2,056         27
    Other                                        140         140          -
                                              ------      ------     ------
                                              $8,328      $8,287     $   41
                                              ======      ======     ======
    1996
    Corporate bonds                           $7,452      $7,430     $   22
                                              ======      ======     ======

        The corporate bonds and other securities in the accompanying 1997
    balance sheet have contractual maturities of one year or less. The cost
    of available-for-sale investments that were sold was based on specific
    identification in determining realized gains recorded in the accompanying
    statement of income. Gain on sale of related-party investments in the
    accompanying 1995 statement of income resulted from gross realized gains
    relating to the sale of available-for-sale investments (Note 9).

    3.  Environmental Services Joint Venture

        Effective April 4, 1994, the Company formed an environmental services
    joint venture with Thermo TerraTech Inc., another public subsidiary of
    Thermo Electron. The joint venture operated under the name Thermo Terra
    Tech. The Company contributed its analytical laboratories and its nuclear
    health physics and environmental science and engineering services
    businesses. Thermo TerraTech contributed its environmental laboratory
    business, which specializes in fast-response testing of
    petroleum-contaminated soils and groundwater, and approximately $31
    million in cash and short-term investments.
        Effective April 2, 1995, the Company and Thermo TerraTech dissolved
    their joint venture. Thermo TerraTech then purchased the services
    businesses formerly operated by the joint venture from the Company for
    $34.3 million in cash, which was the net book value of the services
    businesses. The Company had owned 49% of the joint venture and had
    accounted for its interest in the joint venture using the equity method.

                                       14PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Acquisitions

        In March 1997, the Company acquired 95% of Life Sciences
    International PLC (Life Sciences), a London Stock Exchange-listed
    company. Subsequently, the Company acquired the remaining shares of Life
    Sciences' capital stock. The aggregate purchase price for Life Sciences
    was approximately $442.8 million, net of $55.8 million of cash acquired.
    The purchase price includes the repayment of $105.0 million of Life
    Sciences' bank debt. Life Sciences manufactures laboratory science
    equipment, appliances, instruments, consumables, and reagents for the
    research, clinical, and industrial markets. In March 1997, to partially
    finance the acquisition of Life Sciences, the Company borrowed $210.0
    million from Thermo Electron pursuant to a promissory note due March 1999
    (Note 7). The Company repaid $105.0 million of this promissory note in
    September 1997 and the remaining $105.0 million in January 1998 (Note
    17).
        On November 6, 1997, Thermo Power Corporation, a majority-owned
    subsidiary of Thermo Electron, acquired Peek plc. Thereafter, ONIX
    Systems acquired from Thermo Power the stock of three businesses
    comprising the Peek Measurement Business for $19.1 million. The purchase
    price was determined based on the net book value of the Peek Measurement
    Business at November 6, 1997, a pro rata allocation of Thermo Power's
    total cost in excess of net assets of acquired companies recorded in
    connection with its acquisition of Peek plc based on the 1997 revenues of
    the Peek Measurement Business relative to Peek plc's total revenues, plus
    an estimate of Thermo Power's tax liability that arises from the sale of
    the business to ONIX Systems. The Peek Measurement Business manufactures
    flow and density measurement systems for use in the water/wastewater and
    oil and gas industries. The purchase price is included in due to parent
    company and affiliated companies in the accompanying 1997 balance sheet.
        During 1997, the Company made several other acquisitions for
    approximately $46.2 million, net of cash acquired and including the
    repayment of $1.3 million of bank debt, and the issuance of subsidiary
    stock options valued at an aggregate $1.7 million. To partially finance
    1997 acquisitions, ThermoSpectra borrowed an aggregate of $60.0 million
    from Thermo Electron pursuant to promissory notes due 1999 and Thermo
    Vision borrowed $3.8 million from Thermo Electron pursuant to a
    promissory note due 2000 (Note 7).
        In March 1996, the Company completed the acquisition of a substantial
    portion of the businesses constituting the Scientific Instruments
    Division of Fisons plc (the Fisons businesses), a wholly owned subsidiary
    of Rhone-Poulenc Rorer Inc. (RPR), for approximately $181.2 million, net
    of $7.7 million of cash acquired, and the assumption of approximately
    $47.2 million of indebtedness. In December 1997, the Company and RPR
    negotiated a post-closing adjustment under the terms of the purchase
    agreement for the acquisition of the Fisons businesses pertaining to
    determination of the net assets of the Fisons businesses at the date of
    acquisition. This negotiation resulted in a refund to the Company of
    $36.1 million, plus $3.8 million of interest from the date of
    acquisition. The Company has recorded $33.1 million of the refund as a
    reduction of cost in excess of net assets of acquired companies. The
    remaining $3.0 million represented payment for uncollected accounts

                                       15PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Acquisitions (continued)

    receivable acquired by the Company that were guaranteed by RPR. In 1996,
    the Company wrote off $3.5 million of acquired technology relating to
    this acquisition, which represents the portion of the purchase price
    allocated to technology in development based on estimated replacement
    cost. The Fisons businesses are involved in the research, development,
    manufacture, and sale of analytical instruments to industrial and
    research laboratories worldwide.
        To finance the acquisition of the Fisons businesses, the Company used
    available cash in addition to borrowings from Thermo Electron (Note 7).
    During 1996, the Company made several other acquisitions for an aggregate
    $67.0 million in cash, net of cash acquired.
        During 1995, the Company made several acquisitions for an aggregate
    $89.5 million in cash, net of cash acquired.
        These acquisitions have been accounted for using the purchase method
    of accounting, and their results have been included in the accompanying
    financial statements from their respective dates of acquisition. The
    aggregate cost of these acquisitions exceeded the estimated fair value of
    the acquired net assets by $631.9 million, which is being amortized over
    40 years. Allocation of the purchase price for these acquisitions was
    based on estimates of the fair value of the net assets acquired and, for
    acquisitions completed in fiscal 1997, is subject to adjustment upon
    finalization of the purchase price allocation. The Company has gathered
    no information that indicates the final purchase price allocations will
    differ materially from the preliminary estimates.
        Based on unaudited data, the following table presents selected
    financial information for the Company, Life Sciences, and the Fisons
    businesses, on a pro forma basis, assuming the Company and Life Sciences
    had been combined since the beginning of 1996 and the Company and the
    Fisons businesses had been combined since the beginning of 1995. The
    effect of the acquisitions not included in the pro forma data was not
    material to the Company's results of operations. 

    (In thousands except per share amounts)  1997          1996         1995
    ------------------------------------------------------------------------
    Revenues                           $1,645,086    $1,637,582   $1,144,956
    Net income                            126,528       119,842       46,934
    Earnings per share:
      Basic                                  1.04          1.01          .41
      Diluted                                 .95           .92          .39

        The pro forma results are not necessarily indicative of future
    operations or the actual results that would have occurred had the
    acquisition of Life Sciences been made at the beginning of 1996 or the
    acquisition of the Fisons businesses been made at the beginning of 1995. 
        In connection with the acquisition of Life Sciences, the Company has
    undertaken a restructuring of the acquired businesses. In accordance with
    the requirements of Emerging Issues Task Force Pronouncement (EITF) 95-3,
    the Company is in the process of completing a plan that primarily 

                                       16PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Acquisitions (continued)

    includes reductions in staffing levels and abandonment of excess
    facilities. As part of the cost of the acquisition, the Company
    established reserves totaling $24.8 million, primarily for estimated
    severance and excess facilities, $8.8 million of which was expended
    during 1997, primarily for severance. Unresolved matters at January 3,
    1998, included completing planned severances and the locations to be
    abandoned or consolidated, among other decisions concerning the
    integration of the acquired businesses into the Company. In accordance
    with EITF 95-3, finalization of the Company's plan for restructuring the
    acquired businesses will occur within one year from the date of the
    acquisition. Any changes in estimates of these costs prior to such
    finalization will be recorded as adjustments to cost in excess of net
    assets of acquired companies.
        During 1996, the Company had undertaken a restructuring of the Fisons
    businesses. In 1996, the Company established reserves of $38.1 million as
    part of the cost of the acquisition. During 1997 and 1996, the Company
    expended $14.3 million and $19.0 million, respectively, for restructuring
    costs, primarily for severance and abandoned-facility payments. In
    connection with finalizing its restructuring plans for the Fisons
    businesses, the Company recorded an additional $8.1 million of
    acquisition reserves in the first quarter of 1997, primarily for the
    abandonment of excess facilities, as well as for severance pay. This
    amount was recorded as an increase in cost in excess of net assets of
    acquired companies. At January 3, 1998, the remaining reserve for
    restructuring the Fisons businesses was $11.1 million, as adjusted for
    the impact of currency translation, and primarily represents ongoing
    severance and abandoned-facility payments.

    5.  Employee Benefit Plans

    Stock-based Compensation Plans

    Stock Option Plans
    ------------------
        The Company has two stock-based compensation plans for its key
    employees, directors, and others. These plans, adopted in 1993 and 1997,
    permit the grant of a variety of stock and stock-based awards as
    determined by the human resources committee of the Company's Board of
    Directors (the Board Committee), including restricted stock, stock
    options, stock bonus shares, or performance-based shares. To date, only
    nonqualified stock options have been awarded under these plans. The
    option recipients and the terms of options granted under these plans are
    determined by the Board Committee. Generally, options granted to date are
    exercisable immediately, but are subject to certain transfer restrictions
    and the right of the Company to repurchase shares issued upon exercise of
    the options at the exercise price, upon certain events. The restrictions
    and repurchase rights generally lapse ratably over a five- to ten-year
    period, depending on the term of the option, which may range from seven
    to twelve years. Nonqualified stock options may be granted at any price
    determined by the Board Committee, although incentive stock options must
    be granted at not less than the fair market value of the Company's stock 

                                       17PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

    on the date of grant. Generally, all options have been granted at fair
    market value. The Company also has a directors' stock option plan,
    adopted in 1991, that provides for the grant of stock options in the
    Company and its majority-owned subsidiaries to outside directors pursuant
    to a formula approved by the Company's shareholders. Options in the
    Company awarded under this plan are exercisable six months after the date
    of grant and expire three or seven years after the date of grant. In
    addition to the Company's stock-based compensation plans, certain
    officers and key employees may also participate in the stock-based
    compensation plans of Thermo Electron.
        A summary of the Company's stock option activity is as follows:

                              1997              1996              1995
                        ----------------  ----------------  ----------------
                               Weighted          Weighted          Weighted
                       Number   Average   Number  Average   Number  Average
    (Shares                of  Exercise       of Exercise       of Exercise
    in thousands)      Shares     Price   Shares    Price   Shares    Price
    ------------------------------------------------------------------------
    Options outstanding,
      beginning of year 4,066    $13.98    4,026   $11.88    4,747   $11.15
        Granted           727     30.24      472    27.59        7    15.07
        Exercised        (263)     9.50     (255)    7.31     (468)    4.86
        Forfeited        (165)    17.56     (177)   12.00     (260)   11.38
                        -----              -----             -----
    Options outstanding,
      end of year       4,365    $16.83    4,066   $13.98    4,026   $11.88
                        =====    ======    =====   ======    =====   ======
    Options exercisable 4,365    $16.83    4,066   $13.98    4,026   $11.88
                        =====    ======    =====   ======    =====   ======
    Options available
      for grant         2,346              1,908             2,205
                        =====              =====             =====

        A summary of the status of the Company's stock options at January 3,
    1998, is as follows:

                                  Options Outstanding and Exercisable
                              -------------------------------------------
                                                                Weighted
                                            Weighted Average     Average
           Range of              Number            Remaining    Exercise
    Exercise Prices           of Shares     Contractual Life       Price
    ---------------------------------------------------------------------
    (Shares in thousands)
    $ 4.27 - $11.04                 349            1.2 years      $ 6.94
     11.05 -  17.81               2,872            7.4 years       13.07
     17.82 -  31.35               1,144            7.8 years       29.27
                                  -----
    $ 4.27 - $31.35               4,365            7.0 years      $16.83
                                  =====

                                       18PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

    Employee Stock Purchase Program
    -------------------------------
        Substantially all of the Company's full-time U.S. employees are
    eligible to participate in an employee stock purchase program sponsored
    by the Company and Thermo Electron. Under this program, shares of the
    Company's and Thermo Electron's common stock can be purchased at the end
    of a 12-month period at 95% of the fair market value at the beginning of
    the period and the shares purchased are subject to a six-month resale
    restriction. Prior to November 1, 1995, the applicable shares of common
    stock could be purchased at 85% of the fair market value at the beginning
    of the period, and the shares purchased were subject to a one-year resale
    restriction. Shares are purchased through payroll deductions of up to 10%
    of each participating employee's gross wages. During 1997, 1996, and
    1995, the Company issued 51,707 shares, 62,466 shares, and 93,532 shares,
    respectively, of its common stock under this program.

    Pro Forma Stock-based Compensation Expense
        In October 1995, the Financial Accounting Standards Board issued SFAS
    No. 123, "Accounting for Stock-based Compensation," which sets forth a
    fair-value based method of recognizing stock-based compensation expense.
    As permitted by SFAS No. 123, the Company has elected to continue to
    apply APB No. 25 to account for its stock-based compensation plans. Had
    compensation cost for awards in 1997, 1996, and 1995 under the Company's
    stock-based compensation plans been determined based on the fair value at
    the grant dates consistent with the method set forth under SFAS No. 123,
    the effect on the Company's net income and earnings per share would have
    been as follows:

    (In thousands except per share amounts)         1997      1996      1995
    ------------------------------------------------------------------------
    Net income:
      As reported                               $147,258  $132,751   $79,306
      Pro forma                                  143,083   129,591    79,035
    Basic earnings per share:
      As reported                                   1.21      1.12       .70
      Pro forma                                     1.18      1.09       .70
    Diluted earnings per share:
      As reported                                   1.09      1.01       .64
      Pro forma                                     1.06       .99       .64

        Because the method prescribed by SFAS No. 123 has not been applied to
    options granted prior to January 1, 1995, the resulting pro forma
    compensation expense may not be representative of the amount to be
    expected in future years. Pro forma compensation expense for options
    granted is reflected over the vesting period; therefore, future pro forma
    compensation expense may be greater as additional options are granted.

                                       19PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

        The weighted average fair value per share of options granted was
    $11.09, $10.90, and $2.98 in 1997, 1996, and 1995, respectively. The fair
    value of each option grant was estimated on the grant date using the
    Black-Scholes option-pricing model with the following weighted-average
    assumptions:

                                           1997           1996          1995
    ------------------------------------------------------------------------
    Volatility                              28%            26%           26%
    Risk-free interest rate                5.9%           6.2%          5.1%
    Expected life of options          5.2 years      6.2 years     1.1 years

        The Black-Scholes option-pricing model was developed for use in
    estimating the fair value of traded options which have no vesting
    restrictions and are fully transferable. In addition, option-pricing
    models require the input of highly subjective assumptions, including
    expected stock price volatility. Because the Company's employee stock
    options have characteristics significantly different from those of traded
    options, and because changes in the subjective input assumptions can
    materially affect the fair value estimate, in management's opinion, the
    existing models do not necessarily provide a reliable single measure of
    the fair value of its employee stock options.

    401(k) Savings Plans and Employee Stock Ownership Plan
        The majority of the Company's full-time U.S. employees are eligible
    to participate in Thermo Electron's 401(k) savings plan. In addition,
    certain of the Company's employees are eligible to participate in 401(k)
    savings plans sponsored by the Company's Nicolet Instrument Corporation
    and Finnigan Corporation subsidiaries. Contributions to the 401(k)
    savings plans are made by both the employee and the Company. Company
    contributions are based upon the level of employee contributions. For
    these plans, the Company contributed and charged to expense $6.0 million,
    $4.9 million, and $3.9 million in 1997, 1996, and 1995, respectively.

    Defined Benefit Pension Plan
        Life Sciences has a defined benefit pension plan covering
    substantially all of its full-time U.K. employees. 
        Net periodic pension costs (income) included the following
    components:

    (In thousands)                                                 1997
    --------------------------------------------------------------------
    Service cost                                                $ 2,749
    Interest cost on projected benefit obligation                 3,031
    Return on plan assets                                        (9,408)
    Amortization of unrecognized net gain                         3,169
                                                                -------
                                                                $  (459)
                                                                =======

                                       20PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

        The funded status of the Company's defined benefit pension plan is as
    follows:

    (In thousands)                                                     1997
    -----------------------------------------------------------------------
    Actuarial present value of benefit obligations:
      Vested benefits                                               $41,549
      Nonvested benefits                                                  -
                                                                    -------
      Accumulated benefit obligations                                41,549
    Effect of projected future salary increases                       4,341
                                                                    -------
    Projected benefit obligation                                     45,890
    Less: Plan assets at fair value                                  63,707
                                                                    -------
    Excess of plan assets over projected benefit obligation          17,817
    Unrecognized net gain                                              (172)
                                                                    -------
      Prepaid pension costs                                         $17,645
                                                                    =======

        Significant actuarial assumptions used to determine the net periodic
    pension cost were as follows:

                                                                      1997
    ----------------------------------------------------------------------
    Discount rate                                                    8.25%
    Rate of increase in salary levels                                   8%
    Rate of increase in pension rate                                    5%
    Expected long-term rate of return on assets                        10%

    6.  Income Taxes

        The components of income before provision for income taxes and
    minority interest expense are as follows:

    (In thousands)                                1997      1996      1995
    ----------------------------------------------------------------------
    Domestic                                  $186,133  $143,377  $ 95,999
    Foreign                                     61,884    46,546    27,342
                                              --------  --------  --------
                                              $248,017  $189,923  $123,341
                                              ========  ========  ========



                                       21PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    6.  Income Taxes (continued)

        The components of the provision for income taxes are as follows:

    (In thousands)                              1997        1996        1995
    ------------------------------------------------------------------------
    Currently payable:
      Federal                               $ 47,121    $ 29,593    $ 29,336
      State                                    8,154       6,978       5,766
      Foreign                                 26,242      27,100      11,490
                                            --------    --------    --------
                                              81,517      63,671      46,592
                                            --------    --------    --------
    Net deferred (prepaid):
      Federal                                  3,860      (5,553)     (3,628)
      State                                      819      (1,178)       (769)
      Foreign                                  1,917      (5,213)        518
                                            --------    --------    --------
                                               6,596     (11,944)     (3,879)
                                            --------    --------    --------
                                            $ 88,113    $ 51,727    $ 42,713
                                            ========    ========    ========

        The Company and its majority-owned subsidiaries receive a tax
    deduction upon exercise of nonqualified stock options by employees for
    the difference between the exercise price and the market price of the
    underlying common stock on the date of exercise. The provision for income
    taxes that is currently payable does not reflect $1.6 million, $2.0
    million, and $2.1 million of such benefits of the Company and its
    majority-owned subsidiaries that have been allocated to capital in excess
    of par value, directly or through the effect of majority-owned
    subsidiaries' equity transactions, in 1997, 1996, and 1995, respectively.
    The provision for income taxes that is currently payable does not reflect
    $2.4 million, $4.7 million, and $3.0 million of tax benefits used to
    reduce cost in excess of net assets of acquired companies in 1997, 1996,
    and 1995, respectively. The deferred provision for income taxes does not
    reflect $3.4 million of tax benefits used to reduce cost in excess of net
    assets of acquired companies in 1995.



                                       22PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    6.  Income Taxes (continued)

        The provision for income taxes in the accompanying statement of
    income differs from the provision calculated by applying the statutory
    federal income tax rate of 35% to income before provision for income
    taxes and minority interest expense due to the following:

    (In thousands)                                1997      1996        1995
    ------------------------------------------------------------------------
    Provision for income taxes at
      statutory rate                          $ 86,806  $ 66,473    $ 43,169
    Increases (decreases) resulting from:
      Gain on issuance of stock by
        subsidiaries                           (16,241)  (25,100)     (7,045)
      Net foreign losses not benefited and
        tax rate differential                    6,500     5,596       2,438 
      State income taxes, net of federal tax     5,832     3,770       3,248
      Amortization of cost in excess of net
        assets of acquired companies             4,492     2,445       2,432
      Tax benefit of foreign sales
        corporation                             (2,517)   (2,102)     (1,987)
      Other, net                                 3,241       645         458
                                              --------  --------    --------
                                              $ 88,113  $ 51,727    $ 42,713
                                              ========  ========    ========

        Prepaid income taxes and deferred income taxes in the accompanying
    balance sheet consist of the following:

    (In thousands)                                1997      1996
    ------------------------------------------------------------
    Prepaid income taxes:
      Tax loss carryforwards                  $ 43,559  $ 64,902
      Reserves and accruals                     33,717    38,929
      Inventory basis difference                13,109    11,895
      Accrued compensation                       5,306     5,064
      Allowance for doubtful accounts            2,459     2,399
      Other, net                                     -         9
                                              --------  --------
                                                98,150   123,198
     Less: Valuation allowance                  43,235    64,902
                                              --------  --------
                                              $ 54,915  $ 58,296
                                              ========  ========

    Deferred income taxes:
      Depreciation                            $ 24,928  $ 16,476
      Intangible assets                          5,502     4,234
                                              --------  --------
                                              $ 30,430  $ 20,710
                                              ========  ========

                                       23PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    6.  Income Taxes (continued)

        The valuation allowance relates to uncertainty surrounding the
    realization of certain tax assets, including in 1997 $104.8 million of
    foreign tax loss carryforwards and $7.7 million of certain federal tax
    loss carryforwards, the realization of which is limited to the future
    income of certain subsidiaries. Of the $104.8 million of foreign tax loss
    carryforwards, $24.3 million expire from 1998 through 2005 and the
    remainder do not expire. The federal tax loss carryforwards expire from
    1998 through 2010. Any tax benefit resulting from the use of the loss
    carryforwards will first be used to reduce cost in excess of net assets
    of acquired companies. The decrease in the valuation allowance results
    primarily from the decrease in foreign net operating loss carryforwards,
    primarily due to expiration and usage of the carryforwards.
        The Company has not recognized a deferred tax liability for the
    difference between the book basis and tax basis of its investment in the
    common stock of its domestic subsidiaries (such difference relates
    primarily to unremitted earnings and gains on issuance of stock by
    subsidiaries) because the Company does not expect this basis difference
    to become subject to tax at the parent level. The Company believes it can
    implement certain tax strategies to recover its investment in its
    domestic subsidiaries tax-free.
        A provision has not been made for U.S. or additional foreign taxes on
    $148 million of undistributed earnings of foreign subsidiaries that could
    be subject to taxation if remitted to the U.S. because the Company
    currently plans to keep these amounts permanently reinvested overseas.

    7.  Short- and Long-term Obligations

    Short-term Obligations
        Notes payable in the accompanying balance sheet includes $58.7
    million and $89.3 million of bank borrowings at several of the Company's
    foreign subsidiaries at year-end 1997 and 1996, respectively. The
    weighted average interest rate for these borrowings was 4.80% and 5.25%
    at year-end 1997 and 1996, respectively. Unused lines of credit were
    $108.8 million at year-end 1997.
        In June 1997, to finance the repayment of Life Sciences' debt, the
    Company borrowed $115.0 million from Thermo Electron, which was repaid in
    September 1997. 
        In connection with Thermo Optek's acquisition of Spectronic
    Instruments, Inc. and VG Systems Limited from the Company, Thermo Optek
    borrowed $40.0 million from Thermo Electron pursuant to a promissory note
    due August 1998.
        In connection with the 1996 acquisition of Kevex Instruments and
    Kevex X-Ray from the Company, ThermoSpectra borrowed $15.0 million from
    Thermo Electron pursuant to a promissory note due August 1998. 
        To finance the acquisition of the Fisons businesses (Note 4), the
    Company used available cash in addition to borrowings of $89.0 million
    from Thermo Electron. In April 1996, the Company repaid a portion of the
    borrowings and issued a $65.0 million promissory note for the remaining
    indebtedness, which was repaid in October 1996. 

                                       24PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    7.  Short- and Long-term Obligations (continued)

        To partially finance the acquisition of the DYNEX Technologies
    (DYNEX; formerly Dynatech Laboratories Worldwide) division of Dynatech
    Corporation in February 1996, Thermo BioAnalysis borrowed $30.0 million
    from Thermo Electron pursuant to a promissory note, which was repaid in
    July 1996.
        To partially finance the acquisition of Gould Instrument Systems,
    Inc. in May 1995, ThermoSpectra borrowed $15.0 million from Thermo
    Electron pursuant to a promissory note, which was repaid in August 1995.
        The promissory notes due to Thermo Electron bear interest at the
    90-day Commercial Paper Composite Rate plus 25 basis points, set at the
    beginning of each quarter. The interest rate for the notes outstanding at
    year-end 1997 and 1996 was 5.76% and 5.77%, respectively.

    Long-term Obligations
        Long-term obligations of the Company are as follows:

    (In thousands except per share amounts)                 1997        1996
    ------------------------------------------------------------------------
    3 3/4% Senior convertible note to parent company,
      due 2000, convertible at $13.55 per share         $140,000    $140,000
    3 3/4% Senior convertible debentures, due 2000,
     convertible at $13.55 per share                      15,324      22,281
    4 1/2% Senior convertible debentures, due 2003,
      convertible at $34.46 per share                    172,500     172,500
    5% Subordinated convertible debentures, due 2000,
      convertible into shares of ThermoQuest
      at $16.50 per share                                 80,591      96,250
    5% Subordinated convertible debentures, due 2000,
      convertible into shares of Thermo Optek
      at $13.94 per share                                 79,956      96,250
    10.23% Mortgage loan secured by property with a
     net book value of $15,780, payable in monthly
     installments with final payments in 2004              8,343       9,267
    Promissory note to parent company, due 1999 (a)      105,000           -
    Promissory notes to parent company from 
      ThermoSpectra, due 1999 (a)                         60,000           -
    Promissory note to parent company from Thermo
      Vision, due 2000 (a)                                 3,800           -
    Promissory note to parent company from
      ThermoSpectra, due 1998                                  -      15,000 
    Other                                                 10,101       4,788
                                                        --------    --------
                                                         675,615     556,336
    Less: Current maturities of long-term obligations      2,421       2,122
                                                        --------    --------
                                                        $673,194    $554,214
                                                        ========    ========

    (a) Bears interest at the 90-day Commercial Paper Composite Rate plus 25
        basis points.

                                       25PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    7.  Short- and Long-term Obligations (continued)

        The senior convertible debentures are guaranteed on a senior basis by
    Thermo Electron. The 5% subordinated convertible debentures of
    ThermoQuest and Thermo Optek are guaranteed on a subordinated basis by
    Thermo Electron. The Company has agreed to reimburse Thermo Electron in
    the event Thermo Electron is required to make a payment under the
    guarantee.
        In lieu of issuing all or a portion of the Company's common stock
    upon conversion of the 3 3/4% senior convertible debentures due 2000, the
    Company has the option to pay holders of the debentures cash equal to the
    weighted average market price of the Company's common stock on the last
    trading date prior to conversion.
        During 1997, 1996, and 1995, convertible obligations of $38.9
    million, $67.6 million, and $18.3 million, respectively, were converted
    into common stock of the Company or its subsidiaries.
        The annual requirements for long-term obligations as of January 3,
    1998, are $2.4 million in 1998; $167.5 million in 1999; $322.2 million in
    2000; $2.4 million in 2001; $2.2 million in 2002; and $178.9 million in
    2003 and thereafter. Total future requirements of long-term obligations
    are $675.6 million.
        See Note 13 for the fair value information pertaining to the
    Company's long-term obligations.

    8.  Commitments and Contingencies

    Operating Leases
        The Company leases portions of its office and operating facilities
    under various operating lease arrangements. The accompanying statement of
    income includes expenses from operating leases of $28.2 million, $21.1
    million, and $11.1 million in 1997, 1996, and 1995, respectively. Future
    minimum payments due under noncancellable operating leases at January 3, 
    1998, are $24.5 million in 1998; $20.6 million in 1999; $16.3 million in
    2000; $13.0 million in 2001; $10.8 million in 2002; and $36.2 million in
    2003 and thereafter. Total future minimum lease payments are $121.4
    million.

    Contingencies
        In December 1996, five former employees of the Company's Epsilon
    Industrial, Inc. (Epsilon) subsidiary commenced an arbitration proceeding
    naming as joint defendants Epsilon, the Company, and certain affiliates
    of the Company, alleging that these entities breached the terms of
    certain agreements entered into with such employees at the time that a
    predecessor of Epsilon acquired the assets and business of a company
    formerly owned by such employees. The former employees are claiming
    actual damages of between $27 million and $46 million, punitive damages
    of twice the actual damages, attorneys' fees and expenses, and
    pre-judgment and post-judgment interest, resulting from the alleged
    failure of the Company and its affiliates to, among other things, use
    best efforts to develop and promote certain products acquired at that
    time. The arbitration proceeding, which is binding and non-appealable, is
    expected to conclude in the second quarter of 1998.

                                       26PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    8.  Commitments and Contingencies (continued)

        ThermoQuest's Finnigan subsidiary has filed complaints against
    Bruker-Franzen Analytik GmbH and its U.S. affiliate, and Hewlett-Packard
    Company, for alleged violation of two U.S. patents owned by Finnigan
    pertaining to methods used in ion-trap mass spectrometers. One of
    Finnigan's complaints was filed in United States District Court and the
    other was filed with the United States International Trade Commission
    (ITC). In February 1998, an administrative law judge at the ITC issued an
    initial determination to the effect that, although one of Finnigan's
    patents was infringed, the patents were invalid for purposes of this
    case. The ITC's jurisdiction on this matter is limited to the issue of
    whether or not the defendants' products that use the patented methods can
    be imported into the U.S. The judge's initial determination will be
    considered by the full commission during the second quarter of 1998.
    Bruker has presented counterclaims alleging that the Finnigan patents are
    invalid and unenforceable and are not infringed by the mass spectrometers
    co-marketed by Bruker. They also allege that Finnigan has violated
    antitrust laws by attempting to maintain a monopoly position and restrain
    trade through enforcement of allegedly fraudulently obtained patents.
    Bruker has asked for judgment consistent with its counterclaims, and for
    three times the antitrust damages (including attorney's fees) it has
    sustained.
        Although the Company intends to vigorously defend these matters,
    there can be no assurance as to their outcome. In the opinion of
    management, while an unfavorable resolution of one or both of these
    matters could materially affect the Company's results of operations and
    cash flows in a particular quarter or year, any such resolution would not
    have a material adverse effect on the Company's financial position.
        The Company is also contingently liable with respect to certain other
    lawsuits and matters which, in the opinion of management, will not have a
    material effect upon the financial position of the Company or its results
    of operations.

                                       27PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    9.  Related-party Transactions

    Corporate Services Agreement
        The Company and Thermo Electron have a corporate services agreement
    under which Thermo Electron's corporate staff provides certain
    administrative services, including certain legal advice and services,
    risk management, certain employee benefit administration, tax advice and
    preparation of tax returns, centralized cash management, and certain
    financial and other services, for which the Company paid Thermo Electron
    annually an amount equal to 1.0% of the Company's revenues in 1997 and
    1996 and 1.2% of the Company's revenues in 1995. For these services, the
    Company was charged $15.9 million, $12.1 million, and $9.4 million in
    1997, 1996, and 1995, respectively. Beginning in 1998, the Company will
    pay an annual fee equal to 0.8% of the Company's revenues. The annual fee
    is reviewed and adjusted annually by mutual agreement of the parties.
    Management believes that the service fee charged by Thermo Electron is
    reasonable and that such fees are representative of the expenses the
    Company would have incurred on a stand-alone basis. The corporate
    services agreement is renewed annually but can be terminated upon 30
    days' prior notice by the Company or upon the Company's withdrawal from
    the Thermo Electron Corporate Charter (the Thermo Electron Corporate
    Charter defines the relationship among Thermo Electron and its
    majority-owned subsidiaries). For additional items such as employee
    benefit plans, insurance coverage, and other identifiable costs, Thermo
    Electron charges the Company based upon costs attributable to the
    Company.

    Repurchase Agreement
        The Company invests excess cash in a repurchase agreement with Thermo
    Electron as discussed in Note 1.

    Sale of Related-party Investments
        During 1995, the Company sold its remaining investment in 6 1/2%
    subordinated convertible debentures due 1998, which were issued by
    Thermedics Inc., a majority-owned subsidiary of Thermo Electron. The
    Company sold $2.3 million principal amount of the Thermedics debentures
    in 1995 for net proceeds of $4.5 million, which resulted in a gain of
    $2.2 million.

    Short- and Long-term Obligations
        See Note 7 for short- and long-term obligations of the Company held
    by Thermo Electron.

    10. Common Stock

        At January 3, 1998, the Company had reserved 23,635,127 unissued
    shares of its common stock for possible issuance under stock-based
    compensation plans and for issuance upon possible conversion of the
    Company's convertible obligations.

                                       28PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    11. Issuance of Stock by Subsidiaries

        Gain on issuance of stock by subsidiaries in the accompanying
    statement of income results from the following transactions:

    1997
        Sale of 1,768,500 shares of ThermoQuest common stock at $15.00 per
    share for net proceeds of $24.8 million and conversion of $15.7 million
    of ThermoQuest 5% subordinated convertible debentures, convertible at
    $16.50 per share, into 949,027 shares of ThermoQuest common stock
    resulted in gains of $12.0 million and $7.8 million, respectively.
        Initial public offering of 2,300,000 shares of Metrika Systems common
    stock at $15.50 per share for net proceeds of $32.5 million resulted in a
    gain of $13.2 million.
        Private placements of 1,639,670 shares of ONIX Systems common stock
    at $14.25 per share for net proceeds of $22.0 million resulted in a gain
    of $7.9 million.
        Conversion of $13.1 million and $3.2 million of Thermo Optek 5%
    subordinated convertible debentures, convertible at $14.85 per share and
    $13.94 per share, respectively, into 1,111,316 shares of Thermo Optek
    common stock resulted in a gain of $3.2 million.
        Initial public offering of 1,139,491 shares of Thermo Vision common
    stock at $7.50 per share for net proceeds of $7.0 million resulted in a
    gain of $2.3 million.

    1996
        Initial public offering of 3,450,000 shares of ThermoQuest common
    stock at $15.00 per share for net proceeds of $47.8 million resulted in a
    gain of $27.2 million.
        Initial public offering of 3,450,000 shares of Thermo Optek common
    stock at $13.50 per share for net proceeds of $42.9 million resulted in a
    gain of $25.1 million.
        Initial public offering of 1,670,000 shares of Thermo BioAnalysis
    common stock at $14.00 per share for net proceeds of $20.8 million
    resulted in a gain of $9.8 million.
        Private placement of 967,828 shares of Metrika Systems common stock
    at $15.00 per share for net proceeds of $13.5 million resulted in a gain
    of $9.6 million.

    1995
        Private placement of 1,601,500 shares of Thermo BioAnalysis common
    stock at $10.00 per share for net proceeds of $14.9 million resulted in a
    gain of $9.5 million.
        Initial public offering of 1,725,000 shares of ThermoSpectra common
    stock at $14.00 per share for net proceeds of $21.9 million resulted in a
    gain of $9.3 million.
        Private placement of 202,000 shares of ThermoSpectra common stock at
    $15.72 per share for net proceeds of $3.0 million resulted in a gain of
    $1.3 million.

                                       29PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    11. Issuance of Stock by Subsidiaries (continued)

        The Company's ownership percentages of its majority-owned
    subsidiaries at year end were as follows:

                                                        1997  1996   1995
    ----------------------------------------------------------------------
    ThermoSpectra                                        77%   72%    72%
    ThermoQuest                                          88%   93%   100%
    Thermo Optek                                         91%   93%   100%
    Thermo BioAnalysis                                   70%   67%    80%
    Metrika Systems                                      60%   84%   100%
    Thermo Vision (a)                                    78%   93%   100%
    ONIX Systems                                         87%  100%   100%

    (a)Thermo Vision was a wholly owned subsidiary of Thermo Optek until
       December 1997, when Thermo Optek distributed to its shareholders 100%
       of the common stock of Thermo Vision in the form of a dividend.

    12. Nonrecurring (Income) Expense, Net

        Nonrecurring income, net in 1997 reflects a gain of $2.2 million
    recognized by ThermoSpectra on the sale of its Linac business for $5.0
    million in cash and $2.1 million in equity securities, offset in part by
    a $0.9 million charge incurred by ThermoSpectra, primarily related to
    severance expense for employees terminated during the year at one of its
    business units.
        Nonrecurring expense in 1996 reflects the write-off of acquired
    technology relating to the acquisition of the Fisons businesses (Note 4).

    13. Fair Value of Financial Instruments

        The Company's financial instruments consist primarily of cash and
    cash equivalents, available-for-sale investments, accounts receivable,
    notes payable and current maturities of long-term obligations, accounts
    payable, due to parent company and affiliated companies, long-term
    obligations, and forward exchange contracts. The carrying amounts of
    these financial instruments, with the exception of available-for-sale
    investments, long-term obligations, and forward foreign exchange
    contracts, approximate fair value due to their short-term nature.
        Available-for-sale investments are carried at fair value in the
    accompanying balance sheet. The fair values were determined based on
    quoted market prices (Note 2).

                                       30PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    13. Fair Value of Financial Instruments (continued)

        The carrying amount and fair value of the Company's long-term
    obligations and off-balance-sheet financial instruments are as follows:

                                           1997                 1996
                                    ------------------   ------------------
                                    Carrying      Fair  Carrying      Fair
    (In thousands)                    Amount     Value    Amount     Value
    -----------------------------------------------------------------------
    Long-term obligations:
        Convertible obligations     $488,371  $767,769  $527,281  $681,550
        Other                        184,823   186,653    26,933    27,767
                                    --------  --------  --------  --------
                                    $673,194  $954,422  $554,214  $709,317
                                    ========  ========  ========  ========

    Off-balance-sheet
      financial instruments:
       Forward exchange
          contracts receivable                $    923            $    886

        The fair value of long-term obligations was determined based on
    quoted market prices and on borrowing rates available to the Company at
    the respective year-ends. The fair value of convertible obligations
    exceeds the carrying amount primarily due to the market price of the
    Company's and subsidiaries' common stock exceeding the conversion price
    of certain of the convertible obligations.
        The Company had forward foreign exchange contracts of $33.1 million
    and $12.8 million at year-end 1997 and 1996, respectively. The fair value
    of such contracts is the estimated amount that the Company would receive
    if it were to terminate the contracts, taking into account the change in
    foreign exchange rates.





                                       31PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    14. Geographical Data

        The Company is engaged in one business segment: developing,
    manufacturing, marketing, and servicing instruments and software used for
    the identification and quantification of complex molecular compounds and
    elements in gases, liquids, and solids. The following table shows data
    for the Company by geographical area:

    (In thousands)                          1997         1996         1995
    -----------------------------------------------------------------------
    Revenues:
        United States                 $1,010,964   $  688,865   $  520,485
        United Kingdom                   296,570      227,375       78,768
        Germany                          172,696      182,958      124,035
        Other Europe                     277,056      225,244      107,755
        Other                            108,277      104,885       79,368
        Transfers among geographical
          areas (a)                     (273,249)    (219,965)    (127,749)
                                      ----------   ----------   ----------
                                      $1,592,314   $1,209,362   $  782,662
                                      ==========   ==========   ==========

    Income before provision for
      income taxes and minority
      interest expense:
        United States                 $  160,338   $   97,114   $   81,144
        United Kingdom                    27,586       14,333        5,128
        Germany                           11,309        9,894        8,703
        Other Europe                      31,937       15,350       12,505
        Other                              6,377       11,500        8,203
        Corporate and
          eliminations (b)               (18,293)     (21,548)     (11,214)
                                      ----------   ----------   ----------
        Total operating income           219,254      126,643      104,469
        Interest and other income,
          net                             28,763       63,280       18,872
                                      ----------   ----------   ----------
                                      $  248,017   $  189,923   $  123,341
                                      ==========   ==========   ==========

    Identifiable assets:
        United States                 $1,354,197   $1,045,345   $  888,620
        United Kingdom                   360,257      253,203       85,615
        Germany                          143,212      172,468      125,686
        Other Europe                     302,744      221,420       94,135
        Other                             68,080       57,435       62,090
        Corporate and
          eliminations (c)               122,663      174,529      116,667
                                      ----------   ----------   ----------
                                      $2,351,153   $1,924,400   $1,372,813
                                      ==========   ==========   ==========

                                       32PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    14. Geographical Data (continued)

    (In thousands)                          1997         1996         1995
    -----------------------------------------------------------------------
    Export revenues included in United
      States revenues above (d):
        Europe                        $  142,014   $  100,767   $   88,418
        Asia                             124,441      107,796       80,839
        Other                             68,398       45,142       40,303
                                      ----------   ----------   ----------
                                      $  334,853   $  253,705   $  209,560
                                      ==========   ==========   ==========

    (a)Transfers among geographical areas are accounted for at prices that
       are representative of transactions with unaffiliated parties.
    (b)Primarily corporate general and administrative expenses.
    (c)Primarily cash, cash equivalents, and available-for-sale investments.
    (d)In general, export revenues are denominated in U.S. dollars.

    15. Earnings per Share

        Basic and diluted earnings per share were calculated as follows:

    (In thousands except per share amounts)     1997        1996        1995
    ------------------------------------------------------------------------
    Basic
    Net income                              $147,258    $132,751    $ 79,306
                                            --------    --------    --------
    Weighted average shares                  121,548     118,857     113,222
                                            --------    --------    --------
    Basic earnings per share                $   1.21    $   1.12    $    .70
                                            ========    ========    ========

    Diluted
    Net income                              $147,258    $132,751    $ 79,306
    Effect of:
      Convertible obligations                  8,089       5,288       5,729
      Majority-owned subsidiaries'
        dilutive securities                   (2,839)       (922)        (34)
                                            --------    --------    --------
    Income available to common
      shareholders, as adjusted             $152,508    $137,117    $ 85,001
                                            --------    --------    --------
    Weighted average shares                  121,548     118,857     113,222
    Effect of:
      Convertible obligations                 16,713      15,292      19,380
      Stock options                            1,154       1,202         689
                                            --------    --------    --------
    Weighted average shares, as adjusted     139,415     135,351     133,291
                                            --------    --------    --------

    Diluted earnings per share              $   1.09    $   1.01    $    .64
                                            ========    ========    ========

                                       33PAGE
<PAGE>
    Thermo Instrument Systems Inc.                 1997 Financial Statements

                   Notes to Consolidated Financial Statements

    15. Earnings per Share (continued)

        In January 1998, the Company sold $250.0 million principal amount of
    4% subordinated convertible debentures, which are convertible into shares
    of the Company's common stock at a conversion price of $35.65 per share
    (Note 17).

    16. Unaudited Quarterly Information

    (In thousands except per share amounts)

    1997(a)                         First(b)  Second       Third      Fourth
    ------------------------------------------------------------------------
    Revenues                     $329,120   $405,235    $403,900    $454,059
    Gross profit                  155,672    194,741     188,901     210,991
    Net income                     33,587     37,219      37,273      39,179
    Earnings per share:
      Basic                           .28        .31         .31         .32
      Diluted                         .25        .28         .28         .29

    1996(c)                         First(d)  Second       Third      Fourth
    ------------------------------------------------------------------------
    Revenues                     $225,571   $321,552    $315,292    $346,947
    Gross profit                  107,364    144,524     147,803     155,506
    Net income                     34,043     35,296      30,521      32,891
    Earnings per share:
      Basic                           .30        .30         .25         .27
      Diluted                         .26        .27         .23         .25

    (a)Results include nontaxable gains of $12.0 million, $13.2 million,
       $12.7 million, and $8.5 million in the first, second, third, and
       fourth quarters, respectively, from the issuance of stock by
       subsidiaries.
    (b)Reflects the March 1997 acquisition of Life Sciences.
    (c)Results include nontaxable gains of $24.3 million, $25.5 million,
       $11.4 million, and $10.5 million in the first, second, third, and
       fourth quarters, respectively, from the issuance of stock by
       subsidiaries.
    (d)Reflects the March 1996 acquisition of the Fisons businesses.

    17. Subsequent Event

        In January 1998, the Company sold at par value $250.0 million
    principal amount of 4% subordinated convertible debentures due 2005 for
    net proceeds of $243.8 million. The debentures are convertible into
    shares of the Company's common stock at a conversion price of $35.65 per
    share and are guaranteed on a subordinated basis by Thermo Electron. The
    Company used a portion of the proceeds to repay a $105.0 million
    promissory note to Thermo Electron. The $105.0 million promissory note
    has been classified as long-term in the accompanying 1997 balance sheet,
    as its repayment was made using the proceeds of debt with a maturity
    beyond one year.
                                       34PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                    Report of Independent Public Accountants

    To the Shareholders and Board of Directors of
    Thermo Instrument Systems Inc.:

        We have audited the accompanying consolidated balance sheet of Thermo
    Instrument Systems Inc. (a Delaware corporation and 82%-owned subsidiary
    of Thermo Electron Corporation) and subsidiaries as of January 3, 1998,
    and December 28, 1996, and the related consolidated statements of income,
    shareholders' investment, and cash flows for each of the three years in
    the period ended January 3, 1998. These consolidated financial statements
    are the responsibility of the Company's management. Our responsibility is
    to express an opinion on these consolidated financial statements based on
    our audits.
        We conducted our audits in accordance with generally accepted
    auditing standards. Those standards require that we plan and perform the
    audit to obtain reasonable assurance about whether the consolidated
    financial statements are free of material misstatement. An audit includes
    examining, on a test basis, evidence supporting the amounts and
    disclosures in the financial statements. An audit also includes assessing
    the accounting principles used and significant estimates made by
    management, as well as evaluating the overall financial statement
    presentation. We believe that our audits provide a reasonable basis for
    our opinion.
        In our opinion, the consolidated financial statements referred to
    above present fairly, in all material respects, the financial position of
    Thermo Instrument Systems Inc. and subsidiaries as of January 3, 1998,
    and December 28, 1996, and the results of their operations and their cash
    flows for each of the three years in the period ended January 3, 1998, in
    conformity with generally accepted accounting principles.



                                               Arthur Andersen LLP



    Boston, Massachusetts
    February 17, 1998 



                                       35PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Management's
    Discussion and Analysis of Financial Condition and Results of Operations.
    For this purpose, any statements contained herein that are not statements
    of historical fact may be deemed to be forward-looking statements.
    Without limiting the foregoing, the words "believes," "anticipates,"
    "plans," "expects," "seeks," "estimates," and similar expressions are
    intended to identify forward-looking statements. There are a number of
    important factors that could cause the results of the Company to differ
    materially from those indicated by such forward-looking statements,
    including those detailed immediately after this Management's Discussion
    and Analysis of Financial Condition and Results of Operations under the
    heading "Forward-looking Statements."

    Results of Operations

        The Company's revenues were $1,592.3 million in 1997, compared with
    $1,209.4 million in 1996, and $782.7 million in 1995. The increases were
    primarily due to acquisitions, which included Life Sciences in March
    1997, a substantial portion of the businesses constituting the Scientific
    Instruments Division of Fisons in March 1996, DYNEX and Oriel Corporation
    in February 1996, the analytical instrument division of Analytical
    Technology, Inc. in December 1995, and Gould Instrument Systems Inc. in
    May 1995. Acquisitions added revenues of $407 million in 1997 and $404
    million in 1996. In addition to the effect of acquisitions, revenues
    increased in 1997 due to higher sales at ThermoQuest's existing mass
    spectrometry business, partly as a result of the continued success of a
    new product introduced in the first quarter of 1996, and due to increased
    sales at Metrika Systems, primarily as a result of increased sales in
    international markets from its on-line raw materials analyzer business.
    Revenues also increased at ONIX Systems, primarily due to increased sales
    of industry-specific instruments to the production segment of the oil and
    gas industry. Revenues from Thermo Optek's existing businesses decreased
    slightly due to the inclusion in 1996 of several large nonrecurring sales
    to the Chinese and Japanese governments, a decrease in demand for
    elemental products in Japan, and the elimination of certain unprofitable
    acquired product lines, offset substantially by greater demand at one of
    its business units. In addition to the effect of acquisitions, revenues
    increased in 1996 due to greater demand experienced by ThermoQuest's mass
    spectrometry business as a result of the introduction of two new
    products, one in the third quarter of 1995 and another in the first
    quarter of 1996, and, to a lesser extent, greater product demand at
    Thermo Optek's Fourier transform infrared (FT-IR) and FT-Raman
    spectrometry businesses. The increases in revenues in 1997 and 1996 were
    offset in part by decreases of $46.8 million and $21.8 million,
    respectively, due to the unfavorable effects of currency translation as a
    result of the strengthening of the U.S. dollar relative to foreign
    currencies in countries in which the Company operates.
        International sales account for a significant portion of the
    Company's total revenues. Although the Company seeks to charge its
    customers in the same currency as its operating costs, the Company's

                                       36PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Results of Operations (continued)

    financial performance and competitive position can be affected by
    currency exchange rate fluctuations. Where appropriate, the Company uses
    short-term forward foreign exchange contracts to reduce its exposure to
    currency fluctuations.
        The gross profit margin was 47% in 1997, compared with 46% in 1996
    and 48% in 1995. The increase in 1997 was primarily due to margin
    improvements at certain of the businesses acquired from Fisons in 1996
    and increased sales of ThermoQuest's higher-margin mass spectrometry
    products. These increases were offset in part by the inclusion of
    lower-margin revenues from acquired businesses, including Life Sciences,
    which recorded an adjustment to expense of $3.6 million in 1997 relating
    to the sale of inventories revalued at the date of acquisition and, to a
    lesser extent, a decrease in the gross profit margin at ThermoSpectra,
    primarily as a result of a one-time inventory write-off and a change in
    sales mix at one of its business units. The gross profit margin decreased
    in 1996 primarily due to lower margins at acquired businesses, including
    Fisons, which included an adjustment to expense of $2.0 million in 1996
    relating to the sale of inventories revalued at the date of acquisition.
        Selling, general, and administrative expenses as a percentage of
    revenues was 27% in 1997 and 28% in 1996 and 1995. The decrease in 1997
    was primarily due to efforts to reduce selling and administrative
    expenses at acquired businesses and, to a lesser extent, lower selling
    costs associated with certain of the Life Sciences businesses.
        Research and development expenses as a percentage of revenues
    remained relatively unchanged at 6.8% in 1997, compared with 7.0% in
    1996, and 6.9% in 1995.
        In 1997, ThermoSpectra recognized a gain of $2.2 million on the sale
    of its Linac business, which was offset in part by a charge by
    ThermoSpectra of $0.9 million for severance costs for employees
    terminated during 1997 (Note 12). In 1996, the Company wrote off $3.5
    million of acquired technology relating to the acquisition of the Fisons
    businesses (Note 4).
        Interest income increased to $28.3 million in 1997 from $20.5 million
    in 1996 and $14.6 million in 1995. The increase in 1997 was due to
    interest income earned on invested proceeds from the issuance of $172.5
    million principal amount of 4 1/2% senior convertible debentures by the
    Company in October 1996 and, to a lesser extent, from the invested
    proceeds from the sale of common stock by the Company's subsidiaries in
    1997 and 1996 (Note 11). The increase in 1996 was primarily the result of
    interest income earned on invested proceeds from the issuance of $96.3
    million principal amount of 5% subordinated convertible debentures by
    each of ThermoQuest and Thermo Optek in August 1995 and October 1995,
    respectively, the sale of common stock by the Company's subsidiaries
    (Note 11) and, to a lesser extent, the issuance of the 4 1/2% senior
    convertible debentures. The increases in interest income in 1997 and 1996
    were offset in part by a reduction in cash as a result of acquisitions.
        Interest expense increased to $45.9 million in 1997 from $28.9
    million in 1996 and $18.1 million in 1995. The increase in 1997 was 

                                       37PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Results of Operations (continued)

    primarily due to the issuance of an aggregate $428.8 million of
    promissory notes to Thermo Electron in connection with acquisitions
    (Note 7), the issuance of 4 1/2% senior convertible debentures by the
    Company in October 1996 and, to a lesser extent, the inclusion of
    interest expense on debt assumed in connection with the acquisitions of
    the Fisons businesses and Life Sciences, which has been subsequently
    repaid. In September 1997, the Company repaid $220.0 million of its
    outstanding promissory notes to Thermo Electron (Notes 4 and 7). The
    increase in 1996 was primarily due to the issuance of the 5% subordinated
    convertible debentures by ThermoQuest and Thermo Optek. To a lesser
    extent, interest expense increased due to the issuance by the Company of
    the 4 1/2% senior convertible debentures, the issuance of promissory
    notes to Thermo Electron in connection with acquisitions (Note 7), and
    the inclusion of interest expense on the debt assumed as part of the
    acquisition of the Fisons businesses. The increases in interest expense
    in 1997 and 1996 were offset in part by the conversion of a portion of
    the Company's and subsidiaries' convertible obligations into common stock
    of the Company and its subsidiaries.
        The Company has adopted a strategy of spinning out certain of its
    businesses into separate subsidiaries and having these subsidiaries sell
    a minority interest to outside investors. The Company believes that this
    strategy provides additional motivation and incentives for the management
    of the subsidiaries through the establishment of subsidiary-level stock
    option programs, as well as capital to support the subsidiaries' growth.
    As a result of the sale of stock by subsidiaries and issuance of stock by
    subsidiaries upon conversion of convertible debentures, the Company
    recorded gains of $46.4 million in 1997, $71.7 million in 1996, and $20.1
    million in 1995 (Note 11). These gains represent an increase in the
    Company's net investment in the subsidiaries and are classified as "Gain
    on issuance of stock by subsidiaries" in the accompanying statement of
    income. The size and timing of these transactions are dependent on market
    and other conditions that are beyond the Company's control. Accordingly,
    there can be no assurance that the Company will be able to generate gains
    from such transactions in the future. Further, in October 1995, the
    Financial Accounting Standards Board (FASB) issued an exposure draft of a
    Proposed Statement of Financial Accounting Standards, "Consolidated
    Financial Statements: Policy and Procedures" (the Proposed Statement).
    The Proposed Statement would establish new rules for how consolidated
    financial statements should be prepared. If the Proposed Statement is
    adopted, there would be significant changes in the way the Company
    records certain transactions of its controlled subsidiaries. Among those
    changes, any sale of the stock of a subsidiary that does not result in a
    loss of control would be accounted for as a transaction in equity of the
    consolidated entity with no gain or loss being recorded. The exposure
    draft addresses the consolidation issues in two parts: consolidation
    procedures, which includes proposed rule changes affecting the Company's
    ability to recognize gains on issuances of subsidiary stock, and
    consolidation policy, which does not address accounting for such gains.
    During fiscal 1997, the FASB decided to focus its efforts on the

                                       38PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Results of Operations (continued)

    consolidation policy part of the exposure draft and to consider resuming
    discussion on consolidation procedures after completion of the efforts on
    consolidation policy. The timing and content of any final statement are
    uncertain.
        The Company recorded a gain of $2.2 million in 1995 from the sale of
    the Company's investment in subordinated convertible debentures issued by
    Thermedics Inc., a majority-owned subsidiary of Thermo Electron (Note 9).
        The effective tax rate was 36% in 1997, 27% in 1996, and 35% in 1995.
    The effective tax rate increased in 1997 primarily due to a lower
    nontaxable gain on issuance of stock by subsidiaries. The effective tax
    rate decreased in 1996 primarily due to a higher nontaxable gain on
    issuance of stock by subsidiaries. Excluding the impact of the gains on
    issuance of stock by subsidiaries, the effective tax rates exceeded the
    statutory federal income tax rate due to the inability to provide a tax
    benefit on losses incurred at certain foreign subsidiaries, the impact of
    foreign and state income taxes, the nondeductible amortization of cost in
    excess of net assets of acquired companies and, in 1996, the write-off of
    acquired technology in connection with the acquisition of the Fisons
    businesses.
        Minority interest expense increased to $12.6 million in 1997 from
    $5.4 million in 1996, primarily due to higher earnings at Thermo
    BioAnalysis, ThermoQuest, and Thermo Optek and, to a lesser extent,
    minority interest associated with the Company's newly public Metrika
    Systems subsidiary. These increases were offset in part by lower earnings
    at ThermoSpectra.
        See Note 8 for a description of certain legal proceedings involving
    the Company.
        The Company is currently assessing the potential impact of the year
    2000 on the processing of date-sensitive information by the Company's
    computerized information systems and on products sold as well as products
    purchased by the Company. The Company believes that its internal
    information systems and current products are either year 2000 compliant
    or will be so prior to the year 2000 without incurring material costs.
    There can be no assurance, however, that the Company will not experience
    unexpected costs and delays in achieving year 2000 compliance for its
    internal information systems and current products, which could result in
    a material adverse effect on the Company's future results of operations.
        The Company is presently assessing the effect that the year 2000
    problem may have on its previously sold products. The Company is also
    assessing whether its key suppliers are adequately addressing this issue
    and the effect this might have on the Company. The Company has not
    completed its analysis and is unable to conclude at this time that the
    year 2000 problem as it relates to its previously sold products and
    products purchased from key suppliers is not reasonably likely to have a
    material adverse effect on the Company's future results of operations.

                                       39PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Liquidity and Capital Resources

        Consolidated working capital was $612.7 million at January 3, 1998,
    compared with $636.7 million at December 28, 1996. Included in working
    capital are cash, cash equivalents, and available-for-sale investments of
    $477.2 million at January 3, 1998, and $530.1 million at December 28,
    1996. Of the $477.2 million balance at January 3, 1998, $290.4 million
    was held by the Company's majority-owned subsidiaries and the balance was
    held by the Company and its wholly owned subsidiaries. Cash provided by
    operating activities in 1997 was $169.3 million. The Company used $19.2
    million during the year to fund an increase in accounts receivable. Of
    the total increase, $11.8 million was at ThermoQuest and resulted from
    higher shipments in the fourth quarter and a competitive trend to
    commercial terms of 30 days from ThermoQuest's past practice of obtaining
    deposits on certain systems. The Company used $23.9 million of cash
    during the year to reduce current liabilities, primarily for certain exit
    costs relating to acquisitions (Note 4).
        At January 3, 1998, $131.4 million of the Company's cash and cash
    equivalents was held by its foreign subsidiaries. While this cash can be
    used outside of the United States, including for acquisitions,
    repatriation of this cash into the United States would be subject to
    foreign withholding taxes and could also be subject to a United States
    tax.
        The Company's investing activities used $485.0 million of cash in
    1997. The Company expended $508.1 million, net of cash acquired, for
    acquisitions, including the repayment of $106.3 million of bank debt
    (Note 4), and $29.2 million for purchases of property, plant, and
    equipment. The Company recorded proceeds of $7.9 million from the sale of
    property, plant, and equipment in 1997.
        The Company's financing activities provided $270.8 million of cash in
    1997. During 1997, to partially finance acquisitions, the Company and its
    majority-owned subsidiaries borrowed an aggregate $428.8 million from
    Thermo Electron pursuant to promissory notes with various dates of
    maturity (Note 7). In September 1997, the Company repaid $220.0 million
    of its outstanding promissory notes to Thermo Electron (Notes 4 and 7).
    Net proceeds from the issuance of Company and subsidiary common stock
    totaled $93.1 million (Note 11). In January 1998, the Company sold at par
    value $250.0 million principal amount of 4% subordinated convertible
    debentures due 2005 for net proceeds of $243.8 million. The Company used
    a portion of the proceeds to repay a $105.0 million promissory note to
    Thermo Electron.
        In 1998, the Company plans to make expenditures of approximately $37
    million for property, plant, and equipment. The Company believes that its
    existing resources are sufficient to meet the capital requirements of its
    existing operations for the foreseeable future. The Company has
    historically complemented internal development with acquisitions of
    businesses or technologies that extend the Company's presence in current
    markets or provide opportunities to enter and compete effectively in new
    markets. The Company will consider making acquisitions of such businesses
    or technologies that are consistent with its plans for strategic growth.
    The Company expects that it will finance these acquisitions through a

                                       40PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Liquidity and Capital Resources (continued)

    combination of internal funds, additional debt or equity financing from
    the capital markets, or short-term borrowings from Thermo Electron
    although there is no agreement with Thermo Electron to ensure that funds
    will be available on acceptable terms or at all. 

    Market Risk

        The Company is exposed to market risk from changes in foreign
    currency exchange rates, interest rates, and equity prices, which could
    affect its future results of operations and financial condition. The
    Company manages its exposure to these risks through its regular operating
    and financing activities. Additionally, the Company uses short-term
    forward contracts to manage certain exposures to foreign currencies. The
    Company enters into forward foreign exchange contracts to hedge firm
    purchase and sale commitments denominated in currencies other than its
    subsidiaries' local currencies. The Company does not engage in extensive
    foreign currency hedging activities; however, the purpose of the
    Company's foreign currency hedging activities is to protect the Company's
    local currency cash flows related to these commitments from fluctuations
    in foreign exchange rates. The Company's forward foreign exchange
    contracts principally hedge transactions denominated in U.S. dollars,
    British pounds sterling, Japanese yen, French francs, and German deutsche
    marks. Gains and losses arising from forward contracts are recognized as
    offsets to gains and losses resulting from the transactions being hedged.
    The Company does not enter into speculative foreign currency agreements. 

    Foreign Currency Exchange Rates
        Forward foreign exchange contracts are sensitive to changes in
    foreign currency exchange rates. The fair value of forward foreign
    exchange contracts is the estimated amount that the Company would pay or
    receive upon termination of the contract, taking into account the change
    in foreign exchange rates. A 10% depreciation in year-end 1997 foreign
    currency exchange rates related to the Company's contracts would result
    in a decrease in the unrealized gain on forward foreign exchange
    contracts of $2 million. Since the Company uses forward foreign exchange
    contracts as hedges of firm purchase and sale commitments, the unrealized
    gain or loss on forward foreign currency exchange contracts resulting
    from changes in foreign currency exchange rates would be offset by a
    corresponding change in the fair value of the hedged item.
        The Company generally views its investment in foreign subsidiaries
    with a functional currency other than the Company's reporting currency as
    long-term. The Company's investment in foreign subsidiaries is sensitive
    to fluctuations in foreign currency exchange rates. The functional
    currencies of the Company's foreign subsidiaries are principally
    denominated in British pounds sterling, German deutsche marks, Dutch
    guilders, and French francs. The effect of a change in foreign exchange
    rates on the Company's net investment in foreign subsidiaries is recorded
    as a separate component of shareholders' investment. A 10% depreciation

                                       41PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Market Risk (continued)

    in year-end 1997 functional currencies, relative to the U.S. dollar,
    would result in a $12 million reduction of shareholders' investment.

    Interest Rates
        Certain of the Company's available-for-sale investments and long-term
    obligations are sensitive to changes in interest rates. Interest rate
    changes would result in a change in the fair value of these financial
    instruments due to the difference between the market interest rate and
    the rate at the date of purchase or issuance of the financial instrument.
    A 10% decrease in year-end 1997 market interest rates would result in a
    negative impact of $6 million on the net fair value of the Company's
    interest-sensitive financial instruments.

    Equity Prices
        The Company's available-for-sale investment portfolio includes equity
    securities that are sensitive to fluctuations in price. In addition, the
    Company's and its subsidiaries' convertible obligations are sensitive to
    fluctuations in the price of Company or subsidiary common stock into
    which the obligations are convertible. Changes in equity prices would
    result in changes in the fair value of the Company's available-for-sale
    investments and convertible obligations due to the difference between the
    current market price and the market price at the date of purchase or
    issuance of the financial instrument. A 10% increase in the year-end 1997
    market equity prices would result in a negative impact of $58 million on
    the net fair value of the Company's price-sensitive equity financial
    instruments.










                                       42PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                           Forward-looking Statements

        In connection with the "safe harbor" provisions of the Private
    Securities Litigation Reform Act of 1995, the Company wishes to caution
    readers that the following important factors, among others, in some cases
    have affected, and in the future could affect, the Company's actual
    results and could cause its actual results in 1998 and beyond to differ
    materially from those expressed in any forward-looking statements made
    by, or on behalf of, the Company.

        Risks Associated with Spinout of Subsidiaries. The Company has
    adopted a strategy of spinning out certain of its businesses into
    separate subsidiaries and having these subsidiaries sell a minority
    interest to outside investors. As a result of the sale of stock by
    subsidiaries, the issuance of stock by subsidiaries upon conversion of
    convertible debentures, and similar transactions, the Company records
    gains that represent the increase in the Company's net investment in the
    subsidiaries. These gains have represented a substantial portion of the
    net income reported by the Company in certain periods. The size and
    timing of these transactions are dependent on market and other conditions
    that are beyond the Company's control. Accordingly, there can be no
    assurance that the Company will be able to generate gains from such
    transactions in the future.
        Further, in October 1995, the Financial Accounting Standards Board
    (FASB) issued an exposure draft of a Proposed Statement of Financial
    Accounting Standards, "Consolidated Financial Statements: Policy and
    Procedures" (the Proposed Statement). The Proposed Statement would
    establish new rules for how consolidated financial statements should be
    prepared. If the Proposed Statement is adopted, there would be
    significant changes in the way the Company records certain transactions
    of its controlled subsidiaries. Among those changes, any sale of the
    stock of a subsidiary that does not result in a loss of control would be
    accounted for as a transaction in equity of the consolidated entity with
    no gain or loss being recorded. The exposure draft addresses the
    consolidation issues in two parts: consolidation procedures, which
    includes proposed rule changes affecting the Company's ability to
    recognize gains on issuances of subsidiary stock, and consolidation
    policy, which does not address accounting for such gains. During fiscal
    1997, the FASB decided to focus its efforts on the consolidation policy
    part of the exposure draft and to consider resuming discussion on
    consolidation procedures after completion of the efforts on consolidation
    policy. The timing and content of any final statement are uncertain.

        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.

        Risks Associated with Acquisition Strategy. One of the Company's
    growth strategies is to supplement its internal growth with the

                                       43PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                           Forward-looking Statements

    acquisition of businesses and technologies that complement or augment the
    Company's existing product lines. Certain businesses acquired by the
    Company have had low levels of profitability. In addition, businesses
    that the Company may seek to acquire in the future may also be marginally
    profitable or unprofitable. In order for any acquired businesses to
    achieve the level of profitability desired by the Company, the Company
    must successfully change operations and improve market penetration. No
    assurance can be given that the Company will be successful in this
    regard. In addition, promising acquisitions are difficult to identify and
    complete for a number of reasons, including competition among prospective
    buyers, the need for regulatory approvals, including antitrust approvals,
    and the high valuations of businesses resulting from historically high
    stock prices in many countries. Acquisitions made by the Company may be
    made at substantial premiums over the fair value of the net assets of the
    acquired companies. There can be no assurance that the Company will be
    able to complete pending or future acquisitions or that the Company will
    be able to successfully integrate any acquired business into its existing
    business or make such businesses profitable. In order to finance any such
    acquisitions, 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 may result in dilution to the Company's shareholders.

        Risks Associated with Technological Change, Obsolescence, and the
    Development and Acceptance of New Products. The market for the Company's
    products and services is characterized by rapid and significant
    technological change and evolving industry standards. New product
    introductions responsive to these factors require significant planning,
    design, development, and testing at the technological, product, and
    manufacturing process levels, and may render existing products and
    technologies uncompetitive or obsolete. There can be no assurance that
    the Company's products will not become uncompetitive or obsolete. In
    addition, industry acceptance of new technologies developed by the
    Company may be slow to develop due to, among other things, existing
    regulations written specifically for older technologies and general
    unfamiliarity of users with new technologies.

        Possible Adverse Effect From Consolidation in the Environmental
    Market and Changes in Environmental Regulations. One of the important
    markets for the Company's products is environmental analysis. During the
    past several years, there has been a contraction in the market for
    analytical instruments used for environmental analysis. This contraction
    has caused consolidation in the businesses serving this market. Such
    consolidation may have an adverse impact on certain of the Company's
    businesses. In addition, most air, water, and soil analysis is conducted
    to comply with federal, state, local, and foreign environmental
    regulations. These regulations are frequently specific as to the type of
    technology required for a particular analysis and the level of detection
    required for that analysis. The Company develops, configures, and markets
    its products to meet customer needs created by existing and anticipated
    environmental regulations. These regulations may be amended or eliminated
    in response to new scientific evidence or political or economic

                                       44PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                           Forward-looking Statements

    considerations. Any significant change in environmental regulations could
    result in a reduction in demand for the Company's products.

        Risks Associated With the Sale of Products to the Pharmaceutical
    Industry. The pharmaceutical industry is one of the important markets for
    the Company's products. Although the Company's existing general purpose
    analytical equipment and services are not subject to regulation by the
    U.S. Food and Drug Administration (the FDA), FDA regulations apply to the
    processes and production facilities used to manufacture pharmaceutical
    products. Any material change by a pharmaceutical company in its
    manufacturing process or equipment could necessitate additional FDA
    review and approval. Such requirements may make it more difficult for the
    Company to sell its products and services to pharmaceutical customers
    that have already applied for or obtained approval for production
    processes using different equipment and supplies. Any changes in the
    regulations that apply to the processes and production facilities used to
    manufacture pharmaceutical products may adversely affect the market for
    the Company's products. In addition, from time to time as a result of
    industry consolidation and other factors, the pharmaceutical industry has
    reduced its capital expenditures for equipment such as that manufactured
    by the Company, and there can be no assurance that further changes in the
    pharmaceutical industry will not adversely affect demand for the
    Company's products.

        Risks Associated With Dependence on Capital Spending Policies and
    Government Funding. The Company's customers include pharmaceutical and
    chemical companies, laboratories, government agencies, and public and
    private research institutions. The capital spending of these entities can
    have a significant effect on the demand for the Company's products. Such
    spending levels are based on a wide variety of factors, including the
    resources available to make such purchases, the spending priorities among
    various types of research equipment, public policy, and the effects of
    different economic cycles. Any decrease in capital spending by any of the
    customer groups that account for a significant portion of the Company's
    sales could have a material adverse effect on the Company's business and
    results of operations.

        Possible Adverse Impact of Significant International Operations.
    International revenues accounted for a significant portion of the
    Company's total revenues in 1997, and the Company expects that
    international revenues will continue to account for a significant portion
    of the Company's revenues in the future. Sales to customers in foreign
    countries are subject to a number of risks, including the following:
    fluctuations in exchange rates may affect product demand and adversely
    affect the profitability in U.S. dollars of products and services
    provided by the Company in foreign markets where payment for the
    Company's products and services is made in the local currency; agreements
    may be difficult to enforce and receivables difficult to collect through
    a foreign country's legal system; foreign customers may have longer
    payment cycles; foreign countries could impose withholding taxes or
    otherwise tax the Company's foreign income, impose tariffs, or adopt
    other restrictions on foreign trade; export licenses, if required, may be

                                       45PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                           Forward-looking Statements

    difficult to obtain and the protection of intellectual property in
    foreign countries may be more difficult to enforce. There can be no
    assurance that any of these factors will not have a material adverse
    effect on the Company's business and results of operations.

        Competition. The Company encounters and expects to continue to
    encounter intense competition in the sale of its products. The Company
    believes that the principal competitive factors affecting the market for
    its products include product performance, price, reliability, and
    customer service. The Company's competitors include large multinational
    corporations and their operating units. Some of the Company's competitors
    have substantially greater financial, marketing, and other resources than
    those of the Company. As a result, they may be able to adapt more quickly
    to new or emerging technologies and changes in customer requirements, or
    to devote greater resources to the promotion and sale of their products,
    than the Company. In addition, competition could increase if new
    companies enter the market or if existing competitors expand their
    product lines or intensify efforts within existing product lines. There
    can be no assurance that the Company's current products, products under
    development or ability to discover new technologies will be sufficient to
    enable it to compete effectively with its competitors.

        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 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. Further, the laws of
    some jurisdictions do not protect the Company's proprietary rights to the

                                       46PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements

                           Forward-looking Statements

    same extent as the laws of the U.S. and there can be no assurance that
    available protections will be adequate. 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 Impact of Year 2000 on Processing of Date-sensitive
    Information. The Company is currently assessing the potential impact of
    the year 2000 on the processing of date-sensitive information by the
    Company's computerized information systems and on products sold as well
    as products purchased by the Company. The Company believes that its
    internal information systems and current products are either year 2000
    compliant or will be so prior to the year 2000 without incurring material
    costs. There can be no assurance, however, that the Company will not
    experience unexpected costs and delays in achieving year 2000 compliance
    for its internal information systems and current products, which could
    result in a material adverse effect on the Company's future results of
    operations.
        The Company is presently assessing the effect that the year 2000
    problem may have on its previously sold products. The Company is also
    assessing whether its key suppliers are adequately addressing this issue
    and the effect this might have on the Company. The Company has not
    completed its analysis and is unable to conclude at this time that the
    year 2000 problem as it relates to its previously sold products and
    products purchased from key suppliers is not reasonably likely to have a
    material adverse effect on the Company's future results of operations.



                                       47PAGE
<PAGE>



   Thermo Instrument Systems Inc.                    1997 Financial Statements

                         Selected Financial Information

   (In thousands
   except per share
   amounts)              1997(a)     1996(b)     1995(c)    1994(d)       1993
   ---------------------------------------------------------------------------
   Statement of
     Income Data:
   Revenues        $1,592,314  $1,209,362  $  782,662 $  649,992    $  529,278
   Income from
     continuing
     operations       147,258     132,751      79,306     58,261        42,793
   Net income         147,258     132,751      79,306     60,220        44,764
   Earnings per
     share from
     continuing
     operations:
       Basic             1.21        1.12         .70        .53           .41
       Diluted           1.09        1.01         .64        .49           .39
   Earnings per 
     share:
       Basic             1.21        1.12         .70        .55           .43
       Diluted           1.09        1.01         .64        .50           .40
    
   Balance Sheet
     Data:
   Working
     capital       $  612,666  $  636,703  $  489,895 $  230,306    $  238,053
   Total assets     2,351,153   1,924,400   1,372,813  1,011,917       891,141
   Long-term
     obligations      673,194     554,214     441,034    263,559       286,161
   Shareholders'
     investment       877,558     746,267     542,705    440,763       358,055

   (a)Reflects the March 1997 acquisition of Life Sciences and nontaxable
      gains of $46.4 million from the issuance of stock by subsidiaries.
   (b)Reflects the March 1996 acquisition of the Fisons businesses, the
      October 1996 issuance of $172.5 million principal amount of
      4 1/2% senior convertible debentures due 2003, and nontaxable gains of
      $71.7 million from the issuance of stock by subsidiaries.
   (c)Reflects the August and October 1995 issuance of $96.3 million
      principal amount of 5% subordinated convertible debentures due 2000 by
      each of ThermoQuest and Thermo Optek, respectively, and nontaxable
      gains of $20.1 million from the issuance of stock by subsidiaries.
   (d)Reflects the March 1994 acquisition of several businesses within the
      EnviroTech Measurements & Controls group of Baker Hughes Incorporated
      and nontaxable gains of $6.5 million from the issuance of stock by
      subsidiary.

                                       48PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements


    Common Stock Market Information
        The Company's common stock is traded on the American Stock Exchange
    under the symbol THI. The following table sets forth the high and low
    sale prices of the Company's common stock for 1997 and 1996, as reported
    in the consolidated transaction reporting system. Prices were restated to
    reflect a five-for-four stock split distributed in October 1997 in the
    form of a 25% stock dividend.

                              1997                          1996
                     ----------------------        ----------------------
    Quarter             High           Low            High           Low
    ---------------------------------------------------------------------
    First            $29 1/5      $23 1/10        $24 2/5       $19 7/10
    Second            28 1/2       22 1/2          34 7/10       22 4/5
    Third             34 1/5       24 3/5          31            23 3/5
    Fourth            34 1/2       23              30 1/10       23 1/5

        As of January 30, 1998, the Company had 2,997 holders of record of
    its common stock. This does not include holdings in street or nominee
    names. The closing market price on the American Stock Exchange for the
    Company's common stock on January 30, 1998, was $29 1/8 per share.
        Common stock of the Company's majority-owned public subsidiaries is
    traded on the American Stock Exchange: ThermoSpectra Corporation (symbol
    THS), ThermoQuest Corporation (symbol TMQ), Thermo Optek Corporation
    (symbol TOC), Thermo BioAnalysis Corporation (symbol TBA), Metrika
    Systems Corporation (MKA), and Thermo Vision Corporation (VIZ).

    Shareholder Services
        Shareholders of Thermo Instrument Systems Inc. who desire information
    about the Company are invited to contact John N. Hatsopoulos, Chief
    Financial Officer, Thermo Instrument Systems Inc., 81 Wyman Street, P.O.
    Box 9046, Waltham, Massachusetts 02254-9046, (781) 622-1111. A mailing
    list is maintained to enable shareholders whose stock is held in street
    name, and other interested individuals, to receive quarterly reports,
    annual reports, and press releases as quickly as possible. Distribution
    of printed quarterly reports is limited to the second quarter only. All
    material will be available from Thermo Electron's Internet site
    (http://www.thermo.com/subsid/thi1.html).

    Stock Transfer Agent
        American Stock Transfer & Trust Company is the stock transfer agent
    and maintains shareholder activity records. The agent will respond to
    questions on issuance of stock certificates, change of ownership, lost
    stock certificates, and change of address. For these and similar matters,
    please direct inquiries to:

        American Stock Transfer & Trust Company
        Shareholder Services Department
        40 Wall Street, 46th Floor
        New York, New York 10005
        (718) 921-8200

                                       49PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1997 Financial Statements


    Dividend Policy
        The Company has never paid cash dividends and does not expect to pay
    cash dividends in the foreseeable future because its policy has been to
    use earnings to finance expansion and growth. Payment of dividends will
    rest within the discretion of the Board of Directors and will depend
    upon, among other factors, the Company's earnings, capital requirements,
    and financial condition.

    Form 10-K Report
        A copy of the Annual Report on Form 10-K for the fiscal year ended
    January 3, 1998, as filed with the Securities and Exchange Commission,
    may be obtained at no charge by writing to John N. Hatsopoulos, Chief
    Financial Officer, Thermo Instrument Systems Inc., 81 Wyman Street, P.O.
    Box 9046, Waltham, Massachusetts 02254-9046.

    Annual Meeting
        The annual meeting of shareholders will be held on Monday, June 1,
    1998, at 9:00 a.m. at the Hyatt Regency Hotel, Scottsdale, Arizona.


                                                                Exhibit 21
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

        As of February 20, 1998, the Registrant owned the following
   subsidiaries:


                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

        Analytical Instrument Development, Inc.       Pennsylvania      100
        Eberline Instrument Company Limited           United Kingdom    100
        Eberline Instrument Corporation               New Mexico        100
        Epsilon Industrial Inc.                       Texas             100
        ESM Eberline Instruments Strahlen             Germany           100
         - und Umweltmesstechnik GmbH
        Fisons Instruments Vertriebs GmbH             Germany           100
           Gebruder Haake GmbH                        Germany           100
        Gas Tech Inc.                                 California        100
           Gas Tech Australia, Pty. Ltd.              Australia          50*
           Gas Tech Partnership                       California         50*
           Gastech Instruments Canada Ltd.            Canada            100
        Life Sciences International Limited           United Kingdom    100
           Comdate Services Limited                   England           100
             Lipshaw Limited                          England           100
             Luckham Limited                          England           100
             Phicom Limited                           England           100
             Shandon Scientific Limited               England           100
             Southions Investments Limited            England           100
             Sungel Puntar Rubber Estate Limited      England           100
             Westions Limited                         England           100
             Whale Scientific Limited                 England           100
           Helmet Securities Limited                  England           100
             Life Sciences International GmbH         Germany           100
             Life Sciences International Kft          Hungary           100
             Life Sciences International SNC          France            100
                Life Sciences International           France            100
                 (France) SA
                Shandon SA                            France            100
             Life Sciences International, Inc.        Pennsylvania      100
             LSI North America Service Inc.           Delaware          100
             Shandon, Inc.                            Pennsylvania      100
                Alko Diagnostic Corporation           Massachusetts     100
                E-C Apparatus Corporation             Florida           100
                Whale Scientific, Inc.                Colorado          100
             Life Sciences International Holdings BV  Netherlands       100
                Biosystems Oy                         Finland           100
                Life Sciences International           Poland            100
                 (Poland) SP z O.O
           Angela Scientific Instruments Limited      England           100
           Britlowes Limited                          England           100

                                                                     PAGE 1<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

           Commendstar Limited                        England           100
           Consumer & Video Holdings Limited          England           100
             Video Communications Limited             England           100
           Greensecure Projects Limited               England           100
           Labsystems Europe GA                       Spain             100
           Labsystems Ges mbH                         Austria           100
             LSI (US) Inc.                            Delaware          100
           Omnigene Limited                           England            59
           Shandon Southern Instruments Limited       England           100
           Shenbridge Limited                         England           100
           Southern Instruments Holdings Limited      England           100
        Metrika Systems Corporation                   Delaware           60**
           Eberline Radiometrie GmbH                  Germany           100
           Eberline Radiometrie S.A.                  France            100
           Gamma-Metrics                              California        100
             Gamma-Metrics International F.S.C. Inc.  Guam              100
           Radiometrie U.S.A., Inc.                   California        100
           Thermo Instrument Systems Limited          United Kingdom    100
        National Nuclear Corporation                  California        100
        ONIX Systems Inc.                             Delaware           87**
           Brandt Instruments, Inc.                   Delaware          100
           CAC Inc.                                   Delaware          100
             Flow Automation Inc.                     Texas             100
             Thermo Instrument Controls de Mexico,    Mexico            100
              S.A. de C.V.
             (1% of which shares are owned directly
              by ONIX Systems Inc.)
             VG Gas Analysis Systems Inc.             Massachusetts     100
           Houston Atlas Inc.                         Texas             100
           ONIX Holdings Limited                      England           100
             CAC Limited                              United Kingdom    100
             Flow Automation (UK) Limited             United Kingdom    100
             VG Gas Analysis Limited                  United Kingdom    100
             Peek Measurement Limited                 England           100
                Peek Environmental Limited            England           100
                Sarasota Data Products Limited        England           100
                Sarasota Instrumentation Limited      England           100
           Peek Measurement, Inc.                     Texas             100
           TN Spectrace Europe B.V.                   Netherlands       100
           TN Technologies Inc.                       Texas             100
             Kay-Ray/Sensall, Inc.                    Delaware          100
             TN Technologies Canada Inc.              Canada            100
           Westronics Inc.                            Texas             100
        Optek-Nicolet Holdings Inc.                   Wisconsin         100

                                                                        PAGE 2<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

           Thermo Optek Corporation                   Delaware           91**
           (additionally, 1.47% of the shares are
            owned directly by The Thermo Electron
            Companies Inc.)
             Spectronic Instruments, Inc.             Delaware          100
                SLM International Inc.                Illinois          100
             Thermo Jarrell Ash Corporation           Massachusetts     100
                ARL Applied Research Laboratories     Switzerland       100
                 S.A.
                  Fisons Instruments (Proprietary)    South Africa      100
                   Limited
                  Thermo Optek Wissenschaftliche      Austria           100
                   Gerate GesmbH
                Baird Do Brazil Representacoes Ltda.  Brazil            100
                Beijing Baird Analytical Instrument   China             100
                 Technology Co. Limited
                Cahn Instrument Corporation           Wisconsin         100
                  Mattson Instruments Limited         United Kingdom    100
                  Thermo Elemental Limited            United Kingdom    100
                  Thermo Optek Limited                United Kingdom    100
                     Unicam Limited                   United Kingdom    100
                       Unicam Export Limited          United Kingdom    100
                  Unicam Analytical Technology        Netherlands       100
                   Netherlands B.V.
                  Unicam Italia SpA                   Italy             100
                  Unicam S.A.                         Belgium           100
                Fisons Instruments Nordic AB          Sweden            100
                Nicolet Instrument Corporation        Wisconsin         100
                  Nicolet Japan K.K.                  Japan             100
                  Spectra-Tech, Inc.                  Wisconsin         100
                  Spectra-Tech, Europe Limited        United Kingdom    100
                Nicolet Instrument GmbH               Germany           100
                Optek Securities Corporation          Massachusetts     100
                Planweld Holding Limited              United Kingdom    100
                  Nicolet Instrument Limited          United Kingdom    100
                  Planweld Limited                    United Kingdom    100
                     Hilger Analytical Limited        United Kingdom    100
                  Thermo Electron Limited             United Kingdom    100
                Thermo Instrument Systems Japan       Delaware          100
                 Holdings, Inc.
                  Nippon Jarrell-Ash Company, Ltd.    Japan             100
                Thermo Instruments (Canada) Inc.      Canada            100
                  Eberline Instruments (Canada) Ltd.  Canada            100
                  Fisons Instruments Inc.             Canada            100

                                                                        PAGE 3<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant


                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

                  Unicam Analytical Inc.              Canada            100
                Thermo Optek France S.A.              France            100
                Thermo Optek Holding B.V.             Netherlands       100
                  Baird Europe B.V.                   Netherlands       100
                     Baird France S.A.R.L.            France            100
             Thermo Group B.V.                        Netherlands       100
           Thermo Optek Materials Analysis (S.E.A.)   Singapore         100
            Pte Limited
           VG Systems Limited                         United Kingdom    100
           ThermoSpectra Corporation                  Delaware           77**
           (additionally, 6.23% of the shares are
            owned directly by The Thermo Electron
            Companies Inc.)
             Diametrix Detectors, Inc.                Delaware           50
             Gould Instrument Systems, Inc.           Ohio              100
             Kevex Instruments Inc.                   Delaware          100
             Kevex X-Ray Inc.                         Delaware          100
             Neslab Instruments Europa BV             Netherlands       100
             Neslab Instruments, Inc.                 New Hampshire     100
             Neslab Instruments Limited               England           100
                Nicolet Instrument Technologies Inc.  Wisconsin         100
             NORAN Instruments Inc.                   Wisconsin         100
             Park Scientific Instruments Corporation  California        100
                Park Scientific S.A.                  Switzerland       100
                PSI Virgin Islands Incorporated       U.S. Virgin       100
                                                      Islands
             Sierra Research and Technology, Inc.     Delaware          100
             ThermoSpectra  B.V.                      Netherlands       100
                Nicolet Technologies B.V.             Netherlands       100
                  Bakker Electronics Limited          United Kingdom    100
                NORAN Instruments B.V.                Netherlands       100
             ThermoSpectra GmbH                       Germany           100
                Gould Nicolet Messtechnik GmbH        Germany           100
                  NORAN Instruments GmbH              Germany           100
             ThermoSpectra Limited                    United Kingdom    100
                Nicolet Technologies Ltd.             United Kingdom    100
             Thermo Spectra S.A.                      France            100
                Nicolet Technologies S.A.R.L.         France            100
        Quest-Finnigan Holdings Inc.                  Virginia          100
        Quest-TSP Holdings Inc.                       Delaware          100


                                                                        PAGE 4<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

           ThermoQuest Corporation                    Delaware           88**
           (43.9% of which shares are owned
            directly by Quest-Finnigan Holdings
            Inc.)
           (additionally, .12% of the shares are
            owned directly by The Thermo Electron
            Companies Inc.)
             Denley Instruments Limited               England           100
             E-C Apparatus Limited                    England           100
             Finnigan FT/MS Inc.                      Delaware          100
             Finnigan Corporation                     Delaware          100
                Finnigan Instruments, Inc.            New York          100
                Finnigan International Sales, Inc.    California        100
                Finnigan MAT China, Inc.              California        100
                Finnigan MAT (Delaware), Inc.         Delaware          100
                Finnigan MAT Instruments, Inc.        Nevada            100
                Finnigan MAT International Sales,     California        100
                 Inc.
                Finnigan MAT (Nevada), Inc.           Nevada            100
                  Finnigan MAT Canada, Ltd.           Canada            100
                  Finnigan MAT GmbH                   Germany           100
                  Finnigan MAT S.R.L.                 Italy             100
                     Thermo Separation Products       Italy             100
                      S.R.L.
                  Masslab Limited                     United Kingdom    100
                  Thermo Instruments Australia Pty.   Australia         100
                   Limited
                  ThermoQuest Ltd.                    United Kingdom    100
                     Finnigan MAT Ltd.                United Kingdom    100
                       Finnigan MAT AB                Sweden            100
                     Thermo Separation Products Ltd.  United Kingdom    100
                Finnigan Properties, Inc.             California        100
             Forma Scientific, Inc.                   Delaware          100
                Forma Ohio Inc.                       Ohio              100
                International Equipment Company       Delaware          100
                  International Equipment Company     England           100
                   Limited
                Savant Instruments, Inc.              New York          100
             Forma Scientific Limited                 England           100
             Hypersil Inc.                            Delaware          100
             Hypersil Limited                         England           100
             Life Sciences International              Hong Kong         100
             (Hong Kong) Limited
             Life Sciences International, Inc.        Pennsylvania      100

                                                                        PAGE 5<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

             Life Sciences International              England           100
             (Europe) Limited
                Life Sciences International           England           100
                 (UK) Limited
                  Kenbury Limited                     England           100
             Savant Instruments Limited               England           100
             ThermoQuest B.V.                         Netherlands       100
                Thermo Separation Products B.V.       Netherlands       100
                  Thermo Separation Products          Belgium           100
                   B.V. B.A.
             ThermoQuest France S.A.                  France            100
                Finnigan Automass S.A.                France            100
                Finnigan MAT S.A.R.L.                 France            100
                Thermo Separation Products S.A.       France            100
             ThermoQuest Italia S.p.A.                Italy             100
             ThermoQuest Spain S.A.                   Spain             100
             ThermoQuest Wissenschaftliche            Austria           100
              Gerate GmbH
             Thermo Separation Products AG            Switzerland       100
             Thermo Separation Products Inc.          Delaware          100
             ThermoQuest GmbH                         Germany           100
                Thermo Separation Products GmbH       Germany           100
             ThermoQuest K.K.                         Japan             100
        RealFlex Systems Inc.                         Texas             100
        SID Instruments Inc.                          Delaware          100
           FI Instruments Inc.                        Delaware          100
           FI S.A.                                    France            100
           Fisons Instruments BV                      Netherlands       100
           Fisons Instruments NV                      Belgium           100
           Fisons Instruments K.K.                    Japan             100
           HB Instruments Inc.                        Delaware          100
           NK Instruments Inc.                        Delaware          100
           Thermo Capillary Electrophoresis Inc.      Delaware          100
           Thermo Haake Ltd.                          United Kingdom    100
           Thermo Haake (U.K.) Limited                United Kingdom    100
           Thermo Instrumentos Cientificos S.A.       Spain             100
        Spectrace Instruments Inc.                    California        100

                                                                        PAGE 6<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

        Thermo BioAnalysis Corporation                Delaware           70**
        (4.1% of which shares are owned directly by
          Quest-TSP Holdings Inc. and 1.8% of 
           which shares are owned directly by
           Quest-Finnigan Holdings Inc.
        (Additionally, 7.12% of the shares are
           owned directly by The Thermo 
           Electron Companies Inc.)
           Denley Instruments Inc.                    North Carolina    100
           Fastighets AB Skrubba                      Sweden            100
           Dynatech Laboratories spol. s.r.o.         Czech Republic    100
           DYNEX Technologies (Asia) Inc.             Delaware          100
           DYNEX Technologies Inc.                    Virginia          100
           Hybaid BV                                  Netherlands       100
           Hybaid Limited                             England           100
           Labsystems Espana SA                       Spain             100
           Labsystems Inc.                            Delaware          100
           Labysystems Japan K.K.                     Japan             100
           Labsystems OY                              Finland           100
             Labsystems (Hong Kong) Limited           Hong Kong          99
             Labsystems BTD                           China              33
             Labsystems LHD                           China              33
             Labsystems Lenpipette                    Russia             95
           Labsystems Pakistan (Private) Ltd          Pakistan           34
           Labsystems Sweden AB                       Sweden            100
           Labsystems (UK) Limited                    England           100
           Life Sciences International(Benelux) B.V.  Netherlands       100
           Thermo BioAnalysis GmbH                    Germany           100
             DYNEX Technologies GmbH                  Germany           100
             Thermo LabSystems Vertriebs GmbH         Germany           100
           Thermo BioAnalysis (Guernsey) Ltd.         Channel           100
                                                      Islands
           Thermo BioAnalysis Holding, Limited        United Kingdom    100
             Affinity Sensors Limited                 United Kingdom    100
             Dynex Technologies Limited               United Kingdom    100
             Thermo BioAnalysis Limited               United Kingdom    100
             Thermo LabSystems Limited                United Kingdom    100
           Thermo BioAnalysis S.A.                    France            100
             Thermo LabSystems S.A.R.L.               France            100
           Thermo LabSystem (Australia) Pty Limited   Australia         100
           Thermo LabSystems Inc.                     Massachusetts     100
        Thermo Environmental Instruments Inc.         California        100

                                                                        PAGE 7<PAGE>
                         THERMO INSTRUMENT SYSTEMS INC.

                         Subsidiaries of the Registrant

                                                         STATE OR
                                                       JURISDICTION   PERCENT
                          NAME                              OF           OF
                                                      INCORPORATION  OWNERSHIP

        Thermo Instruments do Brasil Ltda.            Brazil            100
        (1% of which shares are owned directly
         by Thermo Jarrell Ash Corporation)
        Van Hengel Holding B.V.                       Netherlands       100
           ESM Eberline Instruments Strahlen          Germany           100
         - und Umweltmesstechnik GmbH
           Fisons Instruments Vertriebs GmbH          Germany           100
             Gebruder Haake GmbH                      Germany           100
           Thermo Instrument Systems B.V.             Netherlands       100
             Euroglas B.V.                            Netherlands       100
             Thermo Automation Services  (ThAS) B.V.  Netherlands       100
             This Analytical B.V.                     Netherlands       100
             This Gas Analysis B.V.                   Netherlands
             This Lab Systems B.V.                    Netherlands       100
             This Scientific B.V.                     Netherlands       100
           Thermo Instruments GmbH                    Germany           100
           Thermo Jarrell Ash, S.A.                   Spain             100
        Thermo Vision Corporation                     Delaware           78**
        (additionally, 1.27 % of the shares are
         owned directly by The Thermo Electron
         Companies Inc.)
           CID Technologies Inc.                      New York          100
           Centro Vision Inc.                         Delaware          100
           Hilger Crystals Limited                    United Kingdom    100
           Laser Science, Inc.                        Delaware          100
           Oriel Instruments Corporation              Delaware          100
             Oriel Foreign Sales Corp.                U.S. Virgin       100
                                                      Islands


   * Joint Venture/Partnership                         ** As of 1/3/98
                                                                        PAGE 8<PAGE>






                                                                   Exhibit 23

                    Consent of Independent Public Accountants
                    -----------------------------------------

        As independent public accountants, we hereby consent to the
    incorporation by reference of our reports dated February 17, 1998,
    included in or incorporated by reference into Thermo Instrument Systems
    Inc.'s Annual Report on Form 10-K for the year ended January 3, 1998,
    into the Company's previously filed Registration Statements as follows:
    Registration Statement No. 33-14980 on Form S-8, Registration Statement
    No. 33-16461 on Form S-8, Registration Statement No. 33-14974 on Form
    S-8, Post Effective Amendment to Registration Statement on Form S-4 No.
    33-32579-02 on Form S-8, Registration Statement No. 33-33577 on Form S-8,
    Registration Statement No. 33-36221 on Form S-8, Registration Statement
    No. 33-37866 on Form S-8, Registration Statement No. 33-42270 on Form
    S-3, Registration Statement No. 33-69526 on Form S-3, Registration
    Statement No. 33-65275 on Form S-8, Registration Statement No. 33-37559
    on Form S-8, Registration Statement No. 333-32031 on Form S-3,
    Registration Statement No. 333-02163 on Form S-3, and Registration
    Statement No. 333-17707 on Form S-3.



                                                 Arthur Andersen LLP



    Boston, Massachusetts
    March 10, 1998


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
INSTRUMENT SYSTEMS INC.'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED JANUARY
3, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
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</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
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<SECURITIES>                                     8,328
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<ALLOWANCES>                                    22,786
<INVENTORY>                                    264,719
<CURRENT-ASSETS>                             1,189,368
<PP&E>                                         317,605
<DEPRECIATION>                                  97,666
<TOTAL-ASSETS>                               2,351,153
<CURRENT-LIABILITIES>                          576,702
<BONDS>                                        364,194
                                0
                                          0
<COMMON>                                        12,265
<OTHER-SE>                                     865,293
<TOTAL-LIABILITY-AND-EQUITY>                 2,351,153
<SALES>                                      1,592,314
<TOTAL-REVENUES>                             1,592,314
<CGS>                                          842,009
<TOTAL-COSTS>                                  842,009
<OTHER-EXPENSES>                               106,356
<LOSS-PROVISION>                                 4,366
<INTEREST-EXPENSE>                              45,894
<INCOME-PRETAX>                                248,017
<INCOME-TAX>                                    88,113
<INCOME-CONTINUING>                            147,258
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   147,258
<EPS-PRIMARY>                                     1.21
<EPS-DILUTED>                                     1.09
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
INSTRUMENT SYSTEMS INC.'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED
DECEMBER 28, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               DEC-28-1996
<CASH>                                         522,688
<SECURITIES>                                     7,452
<RECEIVABLES>                                  320,312
<ALLOWANCES>                                    16,981
<INVENTORY>                                    213,683
<CURRENT-ASSETS>                             1,124,910
<PP&E>                                         250,976
<DEPRECIATION>                                  72,313
<TOTAL-ASSETS>                               1,924,400
<CURRENT-LIABILITIES>                          488,207
<BONDS>                                        399,214
                                0
                                          0
<COMMON>                                         9,767
<OTHER-SE>                                     736,500
<TOTAL-LIABILITY-AND-EQUITY>                 1,924,400
<SALES>                                      1,209,362
<TOTAL-REVENUES>                             1,209,362
<CGS>                                          654,165
<TOTAL-COSTS>                                  654,165
<OTHER-EXPENSES>                                87,591
<LOSS-PROVISION>                                 2,274
<INTEREST-EXPENSE>                              28,923
<INCOME-PRETAX>                                189,923
<INCOME-TAX>                                    51,727
<INCOME-CONTINUING>                            132,751
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   132,751
<EPS-PRIMARY>                                     1.12
<EPS-DILUTED>                                     1.01
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
INSTRUMENT SYSTEMS INC.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED
MARCH 29, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          JAN-03-1998
<PERIOD-END>                               MAR-29-1997
<CASH>                                         432,256
<SECURITIES>                                     7,477
<RECEIVABLES>                                  383,760
<ALLOWANCES>                                    20,711
<INVENTORY>                                    285,227
<CURRENT-ASSETS>                             1,192,202
<PP&E>                                         306,107
<DEPRECIATION>                                  76,741
<TOTAL-ASSETS>                               2,384,121
<CURRENT-LIABILITIES>                          680,545
<BONDS>                                        508,597
                                0
                                          0
<COMMON>                                         9,791
<OTHER-SE>                                     764,687
<TOTAL-LIABILITY-AND-EQUITY>                 2,384,121
<SALES>                                        329,120
<TOTAL-REVENUES>                               329,120
<CGS>                                          173,448
<TOTAL-COSTS>                                  173,448
<OTHER-EXPENSES>                                23,407
<LOSS-PROVISION>                                 1,084
<INTEREST-EXPENSE>                               8,460
<INCOME-PRETAX>                                 53,495
<INCOME-TAX>                                    17,770
<INCOME-CONTINUING>                             33,587
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    33,587
<EPS-PRIMARY>                                      .28
<EPS-DILUTED>                                      .25
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
INSTRUMENT SYSTEMS INC.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED
JUNE 28, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JAN-03-1998
<PERIOD-END>                               JUN-28-1997
<CASH>                                         459,328
<SECURITIES>                                     1,713
<RECEIVABLES>                                  376,676
<ALLOWANCES>                                    23,470
<INVENTORY>                                    286,332
<CURRENT-ASSETS>                             1,200,633
<PP&E>                                         316,012
<DEPRECIATION>                                  84,632
<TOTAL-ASSETS>                               2,386,787
<CURRENT-LIABILITIES>                          635,910
<BONDS>                                        401,128
                                0
                                          0
<COMMON>                                         9,791
<OTHER-SE>                                     790,164
<TOTAL-LIABILITY-AND-EQUITY>                 2,386,787
<SALES>                                        734,355
<TOTAL-REVENUES>                               734,355
<CGS>                                          383,942
<TOTAL-COSTS>                                  383,942
<OTHER-EXPENSES>                                   800
<LOSS-PROVISION>                                 2,890
<INTEREST-EXPENSE>                              20,395
<INCOME-PRETAX>                                114,013
<INCOME-TAX>                                    38,761
<INCOME-CONTINUING>                             70,806
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    70,806
<EPS-PRIMARY>                                      .58
<EPS-DILUTED>                                      .53
        

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<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
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</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          JAN-03-1998
<PERIOD-END>                               SEP-27-1997
<CASH>                                         377,445
<SECURITIES>                                    10,949
<RECEIVABLES>                                  387,442
<ALLOWANCES>                                    23,936
<INVENTORY>                                    278,597
<CURRENT-ASSETS>                             1,134,920
<PP&E>                                         315,726
<DEPRECIATION>                                  92,105
<TOTAL-ASSETS>                               2,307,492
<CURRENT-LIABILITIES>                          587,381
<BONDS>                                        388,493
                                0
                                          0
<COMMON>                                        12,239
<OTHER-SE>                                     816,691
<TOTAL-LIABILITY-AND-EQUITY>                 2,307,492
<SALES>                                      1,138,255
<TOTAL-REVENUES>                             1,138,255
<CGS>                                          598,941
<TOTAL-COSTS>                                  598,941
<OTHER-EXPENSES>                                79,404
<LOSS-PROVISION>                                 3,607
<INTEREST-EXPENSE>                              33,843
<INCOME-PRETAX>                                176,502
<INCOME-TAX>                                    60,680
<INCOME-CONTINUING>                            108,079
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</TABLE>


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