THERMO OPTEK CORP
10-Q, 1996-11-06
LABORATORY ANALYTICAL INSTRUMENTS
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                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

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


                                    FORM 10-Q

    (mark one)

    [ X ] Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the Quarter Ended September 28, 1996.

    [   ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934.

                         Commission File Number 1-11757


                            THERMO OPTEK CORPORATION
             (Exact name of Registrant as specified in its charter)

    Delaware                                                       04-3283973
    (State or other jurisdiction of                          (I.R.S. Employer
    incorporation or organization)                        Identification No.)

    8E Forge Parkway
    Franklin, Massachusetts                                             02038
    (Address of principal executive offices)                       (Zip Code)


       Registrant's telephone number, including area code: (617) 622-1000

           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 (or for such shorter
           period that the Registrant was required to file such
           reports), and (2) has been subject to such filing
           requirements for the past 90 days. Yes [ X ] No [   ]

           Indicate the number of shares outstanding of each of
           the issuer's classes of Common Stock, as of the
           latest practicable date.

                   Class                   Outstanding at October 25, 1996
        ----------------------------       -------------------------------
        Common Stock, $.01 par value                  48,450,000
PAGE
<PAGE>
    PART I - FINANCIAL INFORMATION

    Item 1 - Financial Statements


                            THERMO OPTEK CORPORATION

                           Consolidated Balance Sheet
                                   (Unaudited)

                                     Assets


                                                 September 28,  December 30,
    (In thousands)                                        1996          1995
    ------------------------------------------------------------------------
    Current Assets:
      Cash and cash equivalents                       $114,166     $116,890
      Accounts receivable, less allowances of
        $5,781 and $5,669                               72,716       62,250
      Unbilled contract costs and fees                   2,101        1,130
      Inventories:
        Raw materials and supplies                      31,943       29,523
        Work in process and finished goods              28,851       13,463
      Prepaid expenses                                   6,089        4,221
      Prepaid income taxes                              12,012       11,955
      Due from Thermo Instrument and
        affiliated companies                             9,029            -
                                                      --------     --------
                                                       276,907      239,432
                                                      --------     --------

    Property, Plant and Equipment, at Cost              73,365       58,646
      Less: Accumulated depreciation and
            amortization                                20,347       16,645
                                                      --------     --------
                                                        53,018       42,001
                                                      --------     --------

    Patents and Other Assets                            10,532       11,400
                                                      --------     --------

    Cost in Excess of Net Assets of Acquired
      Companies (Note 2)                               196,999      140,049
                                                      --------     --------
                                                      $537,456     $432,882
                                                      ========     ========



                                        2PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                     Consolidated Balance Sheet (continued)
                                   (Unaudited)

                    Liabilities and Shareholders' Investment

                                                September 28,   December 30,
    (In thousands except share amounts)                  1996           1995
    ------------------------------------------------------------------------
    Current Liabilities:
      Notes payable and current maturities of
        long-term obligations                        $ 27,820       $ 18,041
      Accounts payable                                 21,569         19,657
      Accrued payroll and employee benefits             9,754          7,551
      Accrued commissions                               6,332          5,301
      Accrued installation and warranty expenses       11,172          4,194
      Accrued income taxes                              6,419          5,401
      Deferred revenue                                 11,164          8,858
      Other accrued expenses                           31,708         25,833
      Due to Thermo Instrument (Note 2)                55,197             55
                                                     --------       --------
                                                      181,135         94,891
                                                     --------       --------

    Deferred Income Taxes                              14,765         12,293
                                                     --------       --------

    Other Deferred Items                                3,369          3,631
                                                     --------       --------

    Long-term Obligations:
      5% Subordinated convertible debentures           96,250         96,250
      Other                                               569          4,829
                                                     --------       --------
                                                       96,819        101,079
                                                     --------       --------

    Shareholders' Investment (Note 3):
      Common stock, $.01 par value, 100,000,000
        shares authorized; 48,450,000 and
        45,000,000 shares issued and outstanding          485            450
      Capital in excess of par value                  221,686        215,342
      Retained earnings                                21,408          5,262
      Cumulative translation adjustment                (2,211)           (66)
                                                     --------       --------
                                                      241,368        220,988
                                                     --------       --------
                                                     $537,456       $432,882
                                                     ========       ========


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

                                        3PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                        Consolidated Statement of Income
                                   (Unaudited)

                                                     Three Months Ended
                                                ----------------------------
                                                September 28,  September 30,
    (In thousands except per share amounts)              1996           1995
    ------------------------------------------------------------------------
    Revenues                                         $ 90,693       $ 45,932
                                                     --------       --------

    Costs and Operating Expenses:
      Cost of revenues                                 47,918         21,035
      Selling, general and administrative
        expenses                                       25,703         14,626
      Research and development expenses                 5,571          3,361
                                                     --------       --------
                                                       79,192         39,022
                                                     --------       --------

    Operating Income                                   11,501          6,910

    Interest Income                                     1,570             36
    Interest Expense                                   (1,676)          (253)
                                                     --------       --------
    Income Before Provision for Income Taxes           11,395          6,693
    Provision for Income Taxes                          4,969          2,777
                                                     --------       --------
    Net Income                                       $  6,426       $  3,916
                                                     ========       ========

    Earnings per Share                               $    .13       $    .09
                                                     ========       ========

    Weighted Average Shares                            48,410         45,157
                                                     ========       ========


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












                                        4PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                        Consolidated Statement of Income
                                   (Unaudited)


                                                     Nine Months Ended
                                               -----------------------------
                                          
                                               September 28,   September 30,
    (In thousands except per share amounts)             1996            1995
    ------------------------------------------------------------------------
    Revenues                                       $253,682         $148,574
                                                   --------         --------

    Costs and Operating Expenses:
      Cost of revenues                              134,987           72,677
      Selling, general and administrative
        expenses                                     73,175           43,822
      Research and development expenses              16,644            9,892
                                                   --------         --------
                                                    224,806          126,391
                                                   --------         --------

    Operating Income                                 28,876           22,183

    Interest Income                                   4,255               72
    Interest Expense                                 (4,974)            (982)
                                                   --------         --------
    Income Before Provision for Income Taxes         28,157           21,273
    Provision for Income Taxes                       12,011            8,828
                                                   --------         --------

    Net Income                                     $ 16,146         $ 12,445
                                                   ========         ========

    Earnings per Share                             $    .35         $    .28
                                                   ========         ========

    Weighted Average Shares                          46,442           45,157
                                                   ========         ========


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





                                        5PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                      Consolidated Statement of Cash Flows
                                  (Unaudited) 

                                                     Nine Months Ended
                                               -----------------------------
                                               September 28,   September 30,
    (In thousands)                                      1996            1995
    ------------------------------------------------------------------------
    Operating Activities:
      Net income                                   $ 16,146         $ 12,445
      Adjustments to reconcile net income to net
        cash provided by operating activities:
          Depreciation and amortization               8,401            4,978
          Provision for losses on accounts
            receivable                                1,483            1,023 
          Other noncash expenses                      1,372              841
          Increase (decrease) in deferred
            income taxes                               (174)             552
          Changes in current accounts, excluding
            the effects of acquisitions:
              Accounts receivable                     5,721           (4,537)
              Inventories and unbilled contract
                costs and fees                          931           (1,094)
              Other current assets                     (683)             927
              Accounts payable                      (10,175)          (1,839)
              Other current liabilities              (2,859)          (6,083)
          Other                                         792                -
                                                   --------         --------
                Net cash provided by operating
                  activities                         20,955            7,213
                                                   --------         --------

    Investing Activities:
      Acquisitions, net of cash acquired (Note 2)   (15,527)         (12,593)
      Cash payment to parent company for
        acquisition of Mattson and Unicam (Note 2)  (36,558)               -
      Purchases of property, plant and equipment     (4,133)          (1,860)
      Other                                             (66)            (127)
                                                   --------         --------
                Net cash used in investing
                  activities                        (56,284)         (14,580)
                                                   --------         --------

    Financing Activities:
      Net proceeds from issuance of Company
        common stock (Note 3)                        42,937                -
      Increase (decrease) in short-term obligations  (5,816)             519
      Repayment of long-term obligations             (4,166)            (412)
      Transfer from parent company to fund
        acquisition of Baird                              -           12,926
      Net transfer from parent company                    -            1,099
                                                   --------         --------
                Net cash provided by financing
                  activities                       $ 32,955         $ 14,132
                                                   --------         --------
                                        6PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                Consolidated Statement of Cash Flows (continued)
                                  (Unaudited) 


                                                     Nine Months Ended
                                               -----------------------------
                                               September 28,   September 30,
    (In thousands)                                      1996            1995
    ------------------------------------------------------------------------
    Exchange Rate Effect on Cash                   $   (350)        $    149
                                                   --------         --------

    Increase (Decrease) in Cash and
      Cash Equivalents                               (2,724)           6,914
    Cash and Cash Equivalents at Beginning 
      of Period                                     116,890            3,258
                                                   --------         --------
    Cash and Cash Equivalents at End of Period     $114,166         $ 10,172 
                                                   ========         ========

    Noncash Activities (Note 2):
      Fair value of assets of acquired companies   $131,470         $ 20,901
      Due to parent company for acquisition         (55,197)               -
      Cash paid for acquired companies              (16,869)         (12,926)
                                                   --------         --------
        Liabilities assumed of acquired companies  $ 59,404         $  7,975
                                                   ========         ========


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


















                                        7PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                   Notes to Consolidated Financial Statements

    1.   General

         The interim consolidated financial statements presented have been
    prepared by Thermo Optek Corporation (the Company) without audit and, in
    the opinion of management, reflect all adjustments of a normal recurring
    nature necessary for a fair statement of the financial position at
    September 28, 1996, the results of operations for the three- and
    nine-month periods ended September 28, 1996 and September 30, 1995, and
    the cash flows for the nine-month periods ended September 28, 1996 and
    September 30, 1995. Interim results are not necessarily indicative of
    results for a full year.

         The consolidated balance sheet presented as of December 30, 1995,
    has been derived from the consolidated financial statements that have
    been audited by the Company's independent public accountants. The
    consolidated financial statements and notes are presented as permitted by
    Form 10-Q and do not contain certain information included in the annual
    financial statements and notes of the Company. The consolidated financial
    statements and notes included herein should be read in conjunction with
    the financial statements and notes included in the Company's Registration
    Statement on Form S-1 (Reg. No. 333-03630), filed with the Securities and
    Exchange Commission.


    2.   Acquisitions

         On December 1, 1995, Thermo Instrument Systems Inc. (Thermo
    Instrument) acquired the assets of the analytical instruments division of
    Analytical Technology, Inc. (ATI). On April 11, 1996, the Company
    acquired the Mattson Instruments (Mattson) and Unicam divisions of ATI
    from Thermo Instrument for $36.6 million in cash. Mattson is a
    manufacturer of Fourier transform infrared (FT-IR) spectroscopy
    instruments and Unicam is a manufacturer of atomic absorption and
    ultraviolet/visable spectroscopy instruments. Because, as of 
    December 30, 1995, the Company, Mattson, and Unicam were deemed for
    accounting purposes to be under control of their common majority owner,
    Thermo Instrument, the accompanying 1995 historical financial information
    includes the results of Mattson and Unicam from December 1, 1995, the
    date these businesses were acquired by Thermo Instrument. Because the
    Company had not disbursed the funds in connection with the acquisitions
    of Mattson and Unicam as of December 30, 1995, the transfer of these
    businesses was recorded as a contribution of capital in excess of par
    value as of December 1, 1995. The $36.6 million payment from the Company
    to Thermo Instrument was accounted for as a reduction of capital in
    excess of par value as of April 11, 1996.

         On March 29, 1996, Thermo Instrument acquired a substantial portion
    of the businesses comprising the Scientific Instruments Division of
    Fisons plc (Fisons), a wholly owned subsidiary of Rhone-Poulenc Rorer,
    Inc. On November 4, 1996, the Company acquired two businesses formerly
    part of Fisons, Applied Research Laboratories (ARL) and VG Elemental,
    from Thermo Instrument for an aggregate $55.2 million in cash and the

                                        8PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    2.   Acquisitions (continued)

    assumption of $16.6 million in debt, subject to a post-closing adjustment
    to be negotiated with Fisons by Thermo Instrument. ARL is a manufacturer
    of wavelength-dispersive X-ray fluorescence instruments and arc/spark
    atomic emission spectrometers and VG Elemental is a manufacturer of
    inductively coupled plasma/mass spectrometers. The purchase price was
    determined based on the net book value of ARL and VG Elemental at 
    March 29, 1996, and a pro rata allocation of Thermo Instrument's total
    cost in excess of net assets of acquired companies recorded in connection
    with the acquisition of the Fisons businesses. Because, as of March 30,
    1996, the Company, ARL, and VG Elemental were deemed for accounting
    purposes to be under control of their common majority owner, Thermo
    Instrument, the accompanying 1996 historical financial information
    includes the results of ARL and VG Elemental from March 29, 1996, the
    date these businesses were acquired by Thermo Instrument. Because the
    Company had not disbursed the funds in connection with the acquisition of
    ARL and VG Elemental as of September 28, 1996, the purchase price for
    these businesses has been recorded as a payable in the accompanying 1996
    balance sheet.

         In February 1996, the Company acquired Oriel Corporation (Oriel) and
    Corion Corporation (Corion) for an aggregate $16.9 million in cash. Oriel
    is a manufacturer and distributor of electro-optical instruments and
    components and Corion is a manufacturer of commercial optical filters.
    The acquisitions of Oriel and Corion have been accounted for using the
    purchase method of accounting and their results of operations have been
    included in the accompanying financial statements from their respective
    dates of acquisition.

         The cost of these acquisitions exceeded the estimated fair value of
    the acquired net assets by $62.7 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 is
    subject to adjustment upon finalization of the purchase price allocation.

         Based on unaudited data, the following table presents selected
    financial information for the Company, Mattson, Unicam, ARL, and VG
    Elemental on a pro forma basis, assuming the companies had been combined
    since the beginning of 1995. The effect of the acquisitions of Oriel and
    Corion are not included in the pro forma data since these acquisitions
    were not material to the Company's results of operations and financial
    position. 

                                  Three                    Nine
                               Months Ended            Months Ended
                              -------------   ------------------------------
    (In thousands except      September 30,   September 28,    September 30,
    per share amounts)                 1995            1996             1995
    ------------------------------------------------------------------------
    Revenues                      $ 82,007         $271,210         $255,685
    Net income                       2,905           16,233            4,061
    Earnings per share                 .06              .35              .09

                                        9PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    2.   Acquisitions (continued)

         The pro forma results are not necessarily indicative of future
    operations or the actual results that would have occurred had the
    acquisitions of Mattson, Unicam, ARL, and VG Elemental been made at the
    beginning of 1995.

         In connection with the acquisitions of Mattson, Unicam, ARL, and VG
    Elemental, the Company has undertaken a restructuring of the acquired
    businesses. In accordance with the requirements of Emerging Issues Task
    Force Pronouncement 95-3 (EITF 95-3), the Company is in the process of
    developing a plan that is expected to include reductions in staffing
    levels, abandonment of excess facilities, and possible other costs
    associated with exiting certain activities of the acquired businesses. As
    part of the cost of the acquisitions, the Company established reserves
    totaling $11.6 million and $4.7 million for estimated severance, excess
    facilities, and other exit costs associated with the acquisition of
    Mattson and Unicam and the acquisition of ARL and VG Elemental,
    respectively. During the first nine months of 1996, $5.8 million and $1.8
    million of the reserves of Mattson and Unicam and ARL and VG Elemental,
    respectively, were expended. Unresolved issues existing at September 28,
    1996, included identifying specific employees for termination and
    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 not occur beyond one year from
    the respective dates of 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. These reserves are
    included in other accrued expenses in the accompanying balance sheet.


    3.   Initial Public Offering

         In June and July 1996, the Company sold 3,450,000 shares of its
    common stock in an initial public offering at $13.50 per share for net
    proceeds of approximately $42.9 million. Following the offering, Thermo
    Instrument, a majority-owned subsidiary of Thermo Electron Corporation,
    owned 93% of the Company's outstanding common stock.


    Item 2 - 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.
    These statements involve a number of risks and uncertainties, including
    those detailed in Item 5 of this Quarterly Report on Form 10-Q.

                                       10PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    Overview

         The Company's principal operating units include Thermo Jarrell Ash
    Corporation (TJA), a manufacturer and distributor of atomic absorption
    (AA) and atomic emission spectrometry products, and Nicolet Instrument
    Corporation (Nicolet), a manufacturer and distributor of Fourier
    transform infrared (FT-IR) and FT-Raman spectrometry products. Both TJA
    and Nicolet have worldwide sales and service organizations with a strong
    overseas presence in Europe, Japan, and China.

         The Company also has a subsidiary, Thermo Vision Corporation (Thermo
    Vision), which pursues applications of the Company's technologies for
    cost-effective, application-specific instruments and for optical
    components, systems, and subassemblies for analytical instrumentation and
    other applications. In September 1996, the Company announced its intent
    to spin out Thermo Vision through a distribution of 100 percent of its
    outstanding capital stock in the form of a dividend to the Company's
    shareholders. The Company anticipates completing the spinout by the
    second quarter of 1997. The Company intends to seek a Letter Ruling from
    the Internal Revenue Service stating that this proposed spinout would
    have no current tax effect on the Company or its shareholders. There can
    be no assurance that a favorable Letter Ruling will be obtained. The
    Company would distribute the shares upon receipt of the Letter Ruling and
    satisfaction of other conditions, including listing of the Thermo Vision
    shares on the American Stock Exchange. Thermo Vision had revenues of $8.4
    million and $22.6 million for the three- and nine-month periods ended
    September 28, 1996, respectively.

         The Company's strategy is to supplement its internal growth with the
    acquisition of businesses and technologies that complement and augment
    its existing product lines. On December 1, 1995, Thermo Instrument
    Systems Inc. (Thermo Instrument) acquired the assets of the analytical
    instruments division of Analytical Technology, Inc. (ATI). In April 1996,
    the Company acquired the Mattson Instruments (Mattson) and Unicam
    divisions of ATI from Thermo Instrument. For accounting purposes, the
    Company's acquisition of Mattson and Unicam is deemed to have occurred on
    December 1, 1995 (Note 2). Mattson is a manufacturer of FT-IR
    spectroscopy instruments, and Unicam is a manufacturer of AA and
    ultraviolet/visible spectroscopy instruments. In February 1996, the
    Company acquired Oriel Corporation (Oriel), a manufacturer and
    distributor of electro-optical instruments and components and Corion
    Corporation (Corion), a manufacturer of commercial optical filters.

         On March 29, 1996, Thermo Instrument acquired a substantial portion
    of the businesses comprising the Scientific Instruments Division of
    Fisons plc (Fisons). On November 4, 1996, the Company acquired two
    businesses formerly part of Fisons, Applied Research Laboratories (ARL)
    and VG Elemental, from Thermo Instrument for an aggregate $55.2 million
    in cash and the assumption of $16.6 million in debt, subject to a
    post-closing adjustment. For accounting purposes, the Company's
    acquisition of ARL and VG Elemental is deemed to have occurred on March
    29, 1996 (Note 2). ARL is a manufacturer of wavelength-dispersive X-ray
    fluorescence instruments and arc/spark atomic emission spectrometers and
    VG Elemental is a manufacturer of inductively coupled plasma/mass
    spectrometers. ARL and VG Elemental had revenues of $55.7 million and

                                       11PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    Overview (continued)

    $16.2 million in 1995, respectively. In addition to ARL and VG Elemental,
    the Company also acquired four sales and service organizations of these
    two businesses located in South Africa, Austria, Sweden, and Canada. The
    Company anticipates distributing ARL's and VG Elemental's products
    elsewhere through the Company's existing distribution companies.

    Results of Operations

    Third Quarter 1996 Compared With Third Quarter 1995

         Revenues increased $44.8 million, or 97%, to $90.7 million in the
    third quarter of 1996 from $45.9 million in the third quarter of 1995
    primarily due to the acquisitions of ARL and VG Elemental, effective
    March 29, 1996, Mattson and Unicam, effective December 1, 1995, and Oriel
    and Corion in February 1996. Acquisitions added revenues of $40 million
    in the third quarter of 1996. To a lesser extent, revenues increased due
    to greater product demand. In addition, revenues in the third quarter of
    1995 were low as a result of a disruption caused by the relocation of
    certain TJA operations into a new facility. These increases were offset
    in part by a decrease of $1.4 million in revenues 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 where the Company
    operates.

         The gross profit margin decreased to 47% in the third quarter of
    1996 from 54% in the third quarter of 1995 primarily due to the inclusion
    of lower-margin revenues from ARL and VG Elemental. In addition, the
    gross profit margin was unusually high in the third quarter of 1995 as a
    result of a decrease in lower-margin revenues from TJA due to the plant
    relocation discussed above.

         Selling, general and administrative expenses as a percentage of
    revenues decreased to 28% in the third quarter of 1996 from 32% in the
    third quarter of 1995 primarily due to an increase in total revenues.
    Research and development expenses as a percentage of revenues decreased
    to 6.1% in 1996 from 7.3% in 1995 primarily due to decreased spending at
    TJA and lower research and development expenses as a percentage of
    revenues at acquired businesses.

         Prior to their acquisition by the Company, ARL and VG Elemental sold
    products to other business units of the Scientific Instruments Division
    of Fisons for marketing and ultimate resale to the customer. The Company
    plans to distribute the products of ARL and VG Elemental primarily
    through its existing distribution channels. As a result of this strategy,
    the Company expects to increase selling, general and administrative
    expenses as a percentage of revenues at these businesses while improving
    the gross profit margin to cover these additional costs. The Company's
    goal is to improve the gross profit margin at ARL and VG Elemental
    through this change in distribution channels as well as through improving
    product mix and manufacturing efficiencies, although there can be no
    assurance that the Company will be successful in these efforts.

                                       12PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    Third Quarter 1996 Compared With Third Quarter 1995 (continued)

         Interest income increased to $1.6 million in the third quarter of
    1996 from $36,000 in the third quarter of 1995 primarily as a result of
    interest income earned on invested proceeds from the Company's October
    1995 issuance of $96.3 million principal amount of 5% subordinated
    convertible debentures. Interest expense increased to $1.7 million in
    1996 from $0.3 million in 1995 primarily due to interest on the Company's
    5% subordinated convertible debentures.

         The effective tax rate was 43.6% in the third quarter of 1996,
    compared with 41.5% in the third quarter of 1995. The effective tax rates
    exceeded the statutory federal income tax rate primarily due to
    nondeductible amortization of cost in excess of net assets of acquired
    companies and the impact of state income taxes. The effective tax rate
    increased in 1996 from 1995 primarily due to higher nondeductible
    amortization of cost in excess of net assets of acquired companies in
    1996.

    First Nine Months 1996 Compared With First Nine Months 1995

         Revenues increased $105.1 million, or 71%, to $253.7 million in the
    first nine months of 1996 from $148.6 million in the first nine months of
    1995 primarily due to the acquisitions discussed in the results of
    operations for the third quarter and, to a lesser extent, greater product
    demand, primarily at Nicolet as a result of two recently introduced
    products. Acquisitions added revenues of $97.1 million in the first nine
    months of 1996. In addition, revenues in the third quarter of 1995 were
    low as a result of a relocation at TJA as discussed in the results of
    operations for the third quarter. These increases were offset in part by
    a decrease of $5.0 million in revenues 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 where the Company operates.

         The gross profit margin decreased to 47% in the first nine months of
    1996 from 51% in the first nine months of 1995 primarily due to the
    reasons discussed in the results of operations for the third quarter.

         Selling, general and administrative expenses as a percentage of
    revenues were unchanged at 29% in the first nine months of 1996 and 1995.
    Research and development expenses as a percentage of revenues remained
    relatively unchanged at 6.6% in 1996, compared with 6.7% in 1995.

         Interest income increased to $4.3 million in the first nine months
    of 1996 from $72,000 in the first nine months of 1995. Interest expense
    increased to $5.0 million in 1996 from $1.0 million in 1995. These
    increases are due to the reasons discussed in the results of operations
    for the third quarter.

         The effective tax rate was 42.7% in the first nine months of 1996,
    compared with 41.5% in the first nine months of 1995. The effective tax
    rates exceeded the statutory federal income tax rate primarily due to
    nondeductible amortization of cost in excess of net assets of acquired
    companies and the impact of state income taxes.

                                       13PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    Liquidity and Capital Resources

         Consolidated working capital was $95.8 million at September 28,
    1996, compared with $144.5 million at December 30, 1995. Included in
    working capital are cash and cash equivalents of $114.2 million at
    September 28, 1996, compared with $116.9 million at December 30, 1995.
    Cash provided by operating activities was $21.0 million for the first
    nine months of 1996. Accounts receivable decreased by $5.7 million
    primarily as a result of a reduction in receivables at ARL and VG
    Elemental from the date of their acquisition. Accounts payable decreased
    $10.2 million due to a payment for inventories received in the fourth
    quarter of 1995 and a reduction in payables at ARL and VG Elemental from
    the date of their acquisition. Other current liabilities decreased $2.9
    million primarily due to restructuring expenditures at Mattson, Unicam,
    ARL, and VG Elemental.

         On November 4, 1996, the Company acquired ARL and VG Elemental from
    Thermo Instrument (Note 2) for $55.2 million in cash and the assumption
    of $16.6 million in debt, subject to a post-closing adjustment to be
    negotiated with Fisons by Thermo Instrument in connection with the
    negotiations for the settlement of the final purchase price for all of
    the businesses of Fisons acquired by Thermo Instrument in March 1996. The
    Company has recorded a payable of $55.2 million for the acquisition of
    ARL and VG Elemental in the accompanying 1996 balance sheet. The Company
    paid the liability described above to Thermo Instrument on November 4,
    1996.

         The Company's investing activities used $56.3 million of cash in the
    first nine months of 1996. The Company expended an aggregate $52.1
    million, net of cash acquired, for acquisitions, including the
    acquisitions of Mattson and Unicam, and $4.1 million for the purchase of
    property, plant and equipment.

         The Company's financing activities provided $33.0 million of cash in
    the first nine months of 1996. In June and July 1996, the Company sold
    3,450,000 shares of its common stock in an initial public offering for
    net proceeds of approximately $42.9 million (Note 3). During the first
    nine months of 1996, the Company repaid $10.0 million of short- and
    long-term borrowings.

         During the remainder of 1996, the Company plans to make expenditures
    of approximately $1.5 million for property, plant and equipment. Although
    the Company expects positive cash flow from its existing operations, the
    Company anticipates it will require significant amounts of cash to pursue
    the acquisition of complementary businesses. The Company expects that it
    will finance acquisitions through a combination of internal funds,
    additional debt or equity financing from the capital markets, or
    short-term borrowings from Thermo Instrument or Thermo Electron
    Corporation (Thermo Electron), although there is no agreement with Thermo
    Instrument or Thermo Electron under which such parties are obligated to
    lend funds to the Company. The Company believes that its existing
    resources are sufficient to meet the capital requirements of its existing
    businesses for the foreseeable future.

                                       14PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    PART II - OTHER INFORMATION

    Item 5 - Other Information

         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 1996 and beyond to differ
    materially from those expressed in any forward-looking statements made
    by, or on behalf of, the Company.

         Risks Associated with Technological Change, Obsolescence and the
    Development and Acceptance of New Products. The market for the Company's
    products 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.

         Risks Associated with Acquisition Strategy; No Assurance of a
    Successful Acquisition Strategy. The Company's growth strategy is to
    supplement its internal growth with the acquisition of businesses and
    technologies that complement or augment the Company's existing product
    lines. The Company has recently acquired certain businesses within the
    former analytical instruments division of ATI and the former Scientific
    Instruments Division of Fisons plc that were initially acquired by Thermo
    Instrument in December 1995 and March 1996, respectively. Certain of
    these businesses have low levels of profitability, and 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 reduce expenses 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 and the need for regulatory approvals, including antitrust
    approvals. There can be no assurance that the Company will be able to
    complete pending or future acquisitions. 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.


                                       15PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    Item 5 - Other Information (continued)

         Possible Adverse Effect From Consolidation in the Environmental
    Market and Changes in Environmental Regulations. One of the largest
    markets for the Company's products is environmental analysis. During the
    past three 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
    considerations. Any significant change in environmental regulations could
    result in a reduction in demand for the Company's products.

         Possible Adverse Impact of Significant International Operations.
    Sales outside the United States accounted for approximately 60% of the
    Company's revenues in 1995, and the Company expects that international
    sales 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: 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; 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; U.S.
    export licenses may be 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, including Perkin-Elmer and
    Varian. These companies and certain of the Company's other 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

                                       16PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

    Item 5 - Other Information (continued)

    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. 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.


    Item 6 - Exhibits

         See Exhibit Index on the page immediately preceding exhibits.



                                       17PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                                   SIGNATURES


         Pursuant to the requirements 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 as of the 5th day of November
    1996.

                                           THERMO OPTEK CORPORATION



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



                                           John N. Hatsopoulos
                                           --------------------
                                           John N. Hatsopoulos
                                           Chief Financial Officer
























                                       18PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                                  EXHIBIT INDEX


    Exhibit
    Number       Description of Exhibit                                 Page
    ------------------------------------------------------------------------

      2.1        Stock Purchase Agreement dated as of November 4, 1996
                 among Thermo Instrument Systems Inc., SID Instruments
                 Inc., and ATI Acquisition Corp.

      2.2        Stock Purchase Agreement dated as of November 4, 1996
                 between Thermo Instrument Systems Inc. and the
                 Company.

     10.1        Indemnification Agreement dated as of November 4, 1996
                 between Thermo Instrument Systems Inc. and the
                 Company.

     10.2        Stock Holding Assistant Plan and Form of Promissory
                 Note.

     11          Statement re: Computation of earnings per share.

     27          Financial Data Schedule.



























                             DATED November 4, 1996
                             ----------------------






             (1)  SID INSTRUMENTS INC.

             (2)  ATI ACQUISITION CORP.

             (3)  THERMO INSTRUMENT SYSTEMS INC.







                   __________________________________________

                                    AGREEMENT
                     for the sale and purchase of the whole
                         of the issued share capital of
                            Thermo Elemental Limited
                  ____________________________________________

















                                 WARNER CRANSTON
                                 Pickfords Wharf
                                  Clink Street
                                 London SE1 9DG

                               Tel: 0171 403 2900
                               Fax: 0171 403 4221
                              Ref: SXC/TE/1686-40-7
PAGE
<PAGE>
        THIS AGREEMENT is made the 4th day of November                   

                 1996


        BETWEEN:


        (1)  SID INSTRUMENTS INC. (the "Vendor") a Delaware corporation
             whose principal office is at 81 Wyman Street, Waltham, MA
             02254, USA; 

        (2)  ATI ACQUISITION CORP. (the "Purchaser") a Delaware
             corporation whose principal office is at 81 Wyman Street,
             Waltham, MA 02254, USA; and

        (3)  THERMO INSTRUMENT SYSTEMS INC. ("Thermo") a Delaware
             corporation whose principal office is at 81 Wyman Street,
             Waltham, MA 02254, USA.

        WHEREAS:

        (A)  Thermo Elemental Limited ("the Company") is a private
             company incorporated with limited liability in England
             further particulars of which are set out in Schedule 2. 

        (B)  The Vendor has agreed to sell and the Purchaser has agreed
             to buy the Shares (as defined) on the terms and subject to
             the conditions contained in this Agreement.

        AGREED as follows:

        1.   INTERPRETATION

        1.1  In this Agreement and the Schedules to it the following
             expressions shall, unless the context otherwise requires,
             have the following meanings:

             "the Effective Date"               4 November 1996;

             "the Shares"                  the shares in the capital of
                                           the Company set out in Column
                                           (2) of Schedule 1; 

        1.2  The headings in this Agreement are for ease of reference
             only and shall not be taken into account in construing this
             Agreement.  

        1.3  References to Clauses and Schedules are to clauses and
             schedules of this Agreement.

        2.   SALE AND PURCHASE
PAGE
<PAGE>
        2.1  The Vendor agrees to sell with full title guarantee, the
             Shares and the Purchaser agrees to purchase the Shares with
             effect on and from the Effective Date free from any liens,
             claims, charges, encumbrances and equities and together with
             all rights of any nature whatsoever now or after the date of
             this Agreement attaching or accruing to them. 

        2.2  The aggregate consideration for the purchase of the Shares
             shall be the sum set out in Column (3) of Schedule 1 receipt
             of which the Vendor hereby acknowledges.  The Purchaser and
             Vendor acknowledge and agree that such Consideration
             represents the sum of (i) the net tangible assets of the
             Company assumed to be $8,418,000) as of the date of Thermo's
             acquisition of the Shares as part of the acquisition on
             March 29, 1996 by Thermo and its subsidiaries of certain
             businesses of Fisons plc (the "Fisons Businesses") pursuant
             to the Amended and Restated Asset and Stock Purchase
             Agreement dated as of March 29, 1996 among Thermo, Thermo
             Electron Corporation and Fisons plc (the "Restated
             Agreement"), plus (ii) a percentage of the total goodwill
             associated with Thermo's acquisition of the Fisons
             Businesses equal to the sales of the Company for the 1994
             and 1995 fiscal years relative to the total sales of the
             Fisons Businesses for such years (the "Company Percentage"),
             plus (iii) the Company Percentage of the total costs
             incurred by Thermo in acquiring the Fisons Businesses and in
             restructuring the sales and service organization of the
             Fisons Businesses (the "Restructuring Costs").  The parties
             acknowledge that the purchase price paid by Thermo for the
             Fisons Businesses is subject to a post-closing adjustment
             based on the difference between the value of the net
             tangible assets of the Fisons Businesses as shown on the
             closing balance sheet dated as of March 29, 1996 (the
             "Closing Balance Sheet") and the target net tangible asset
             value provided for in the Restated Agreement.  In the event
             of any such adjustment, the Consideration shall be
             recalculated in accordance with the second sentence of this
             paragraph to account for (A) any adjustment in the net
             tangible assets (other than cash) of the Company as shown on
             the Closing Balance Sheet from $8,418,000 and (B) any
             adjustment in the total goodwill associated with Thermo's
             acquisition of the Fisons Businesses.  In addition, the
             Consideration shall be subject to recalculation in
             accordance with the second sentence of this paragraph in the
             event that the Restructuring Costs incurred are less than
             $1,378,000.  If the recalculation made pursuant to this
             paragraph results in an increase in the Consideration, the
             Purchaser shall pay the amount of such increase to the
             Vendor, and if any such recalculation results in a decrease
             in the Consideration, the Vendor shall pay the amount of
             such decrease to the Purchaser.  Any payment made pursuant
             to the preceding sentence shall be made within ten days
             after the Closing Balance Sheet has become final (in the
             case of any adjustment related to the Closing Balance Sheet)
PAGE
<PAGE>
             and no later than March 29, 1997 (in the case of an
             adjustment related to the Restructuring Costs) and shall
             also be accompanied by interest from the date hereof
             calculated as provided in Section 4.1 of the Restated
             Agreement.

        3.   FURTHER ASSURANCE

             The Vendor shall on or at any time after the date of this
             Agreement execute and do all such deeds, documents, acts and
             things as the Purchaser shall reasonably require to give
             effect to this Agreement.

        4.   WARRANTIES

        4.1  The Vendor represents, warrants and undertakes to and with
             the Purchaser in the terms contained in Schedule 3. 

        4.2  The representations, warranties and undertakings contained
             in Schedule 3 shall continue in full force and effect after
             the date of this Agreement.

        5.   COMPLETION

             Completion of the sale and purchase of the Shares shall take
             place on the date of this Agreement at such time and place
             as the parties shall agree when:

             (a)  the Vendor shall hand to the Purchaser duly executed
                  transfers in favor of the Purchaser and the share
                  certificates in respect of the Shares;

             (b)  the Vendor shall, if required, hand to the Purchaser
                  the certificate of incorporation, statutory books and
                  common seal of the Company;

             (c)  the Purchaser shall pay the consideration in accordance
                  with Clause 2.2.

        6.   INDEMNITY

        6.1  The Vendor agrees to indemnify and hold harmless the
             Purchaser from any and all damages, losses, liabilities,
             costs and expenses (including, without limitation,
             settlement costs and any reasonable legal, accounting or
             other expenses for investigating or defending any actions or
             threatened actions) incurred by the Purchaser as a result of
             (i) the inaccuracy of any representation or warranty
             contained in Schedule 3 hereof; (ii) the breach by the
             Vendor of any provision hereof; or (iii) any third party
             claim arising due to the act of omission of the Vendor or
             the Company from March 29, 1996 and prior to the date
             hereof.
PAGE
<PAGE>
        6.2  The Purchaser agrees to indemnify and hold harmless the
             Vendor from any and all damages, losses, liabilities, costs
             and expenses (including, without limitation, settlement
             costs and any reasonable legal, accounting or other expenses
             for investigating or defending any actions or threatened
             actions) incurred by the Vendor as a result of the breach by
             the Purchaser of any provision hereof.

        6.3  Whenever any claim shall arise or indemnification under this
             Agreement, the party seeking indemnification (the
             "Indemnified Party"), shall promptly notify the other party
             (the "Indemnifying Party"), of the claim and, when known,
             the facts constituting the basis for such claim.  In the
             event of any such claim for indemnification  hereunder
             resulting from or in connection with any claim or legal
             proceedings by a third party, the notice to the Indemnifying
             Party shall specify, if known, the amount or an estimate of
             the amount of the liability arising therefrom.  The
             Indemnified Party shall not settle or compromise any claim
             by a third party for which the indemnified Party is entitled
             to indemnification hereunder without the prior consent of
             the Indemnifying Party, unless proceedings have been
             commenced against the Indemnified Party and the Indemnifying
             Party shall not have taken control of such proceedings after
             notification thereof as provided in Clause 6.4 of this
             Agreement.

        6.4  In connection with any claim giving rise to indemnity
             hereunder resulting from or arising out of a claim or legal
             proceedings by a person who is not a party to this
             Agreement, the Indemnifying Party at its sole cost and
             expense may, on notice to the Indemnified party, assume the
             defense of any such claim or legal proceedings if it
             acknowledges to the Indemnified Party its obligations to
             indemnify the Indemnified Party with respect to all elements
             of such claim.  The Indemnified Party shall be entitled to
             participate in (but not control), the defense of any such
             action, with Solicitors of its own choice and its own
             expense.  If the Indemnifying party does not assume the
             defense of any such claim or litigation resulting therefrom
             within 30 days after the date the Indemnifying Party is
             notified of such claim pursuant to Clause 8.1 hereof, (i)
             the Indemnified Party may defend against such claim or
             litigation, after giving notice of the same to the
             Indemnifying Party, on such terms as are appropriate in the
             Indemnified Party's reasonable judgment, and (ii) the
             Indemnifying Party shall be entitled to participate in (but
             not control) the defense of such action, with Solicitors of
             its own choice and at its own expense.
PAGE
<PAGE>
        7.   GENERAL

        7.1  The provisions of this Agreement shall enure to the benefit
             of the successors and assigns of the Vendor and the
             Purchaser.

        8.   NOTICES

        8.1  A notice or other communication under or in connection with
             this Agreement shall be in writing and shall be delivered
             personally or sent by first class pre-paid recorded delivery
             post or by fax to the party due to receive the notice or
             communication at its address set out in this Agreement or
             such other address as either party may specify by notice in
             writing to the other.

        8.2  In the absence of evidence of earlier receipt, a notice or
             communication is deemed given:

             8.2.1     if delivered personally, when left at the address
             referred to in the introduction hereto;

             8.2.2     if sent by post, the second business day after its
             posting;

             8.2.3     if sent by fax, on completion of its transmission.

        9.   GUARANTEE

             Thermo hereby unconditionally guarantees the obligations of
        the Vendor arising under this Agreement.
PAGE
<PAGE>
        10.  GOVERNING LAW

             This Agreement shall be governed by and construed in all
             respects in accordance with English Law and the parties
             agree to submit to the exclusive jurisdiction of the English
             Courts as regards any claim or matter arising in relation to
             this Agreement.
PAGE
<PAGE>

                                   SCHEDULE 1

                     Particulars of Shares and Consideration

                (1)                  (2)                         (3)
        Name of the Company    Particulars of Shares       Consideration
        -------------------    ---------------------       -------------

        Thermo Elemental     2 Ordinary Shares              $18,897,000
        Limited              of 1 British Pounds 
                             Sterling each
PAGE
<PAGE>

                                   SCHEDULE 2
                           Particulars of the Company


        Date of Incorporation:             31/01/96

        Registered Office:            Pickfords Wharf
                                      Clink Street
                                      London SE1 9DG

        Number of registration:            3153084

        Authorised Share Capital:          1,000

        Issued Share Capital:              2
PAGE
<PAGE>
                                   SCHEDULE 3

        1.   The Vendor has full power and authority to enter into and
             perform its obligations under this Agreement and the signing
             of this Agreement does not violate any provision of the
             Vendor's Certificate of Incorporation.

        2.   The Vendor is a company duly incorporated under the laws of
             the State of Delaware, USA.

        3.   The execution of this Agreement, nor the consummation of the
             transaction herein contemplated, nor the fulfillment of or
             compliance with the terms and provisions hereof will breach
             any current provisions of English law nor conflict with or
             result in a breach of any of the terms, conditions or
             provisions of or constitute default under any material
             agreement or instrument to which the Vendor is a party or by
             which it is bound.
PAGE
<PAGE>

        SID INSTRUMENTS INC.



        By:  Earl R. Lewis
           -------------------
             Earl R. Lewis
             President

        ATI ACQUISITION CORP.



        By:  Robert J. Rosenthal
           ------------------------
             Robert J. Rosenthal
             Vice President

        THERMO INSTRUMENT SYSTEMS INC.



        By:  Earl R. Lewis
             -----------------
             Earl R. Lewis
             Executive Vice President



                            STOCK PURCHASE AGREEMENT

             This AGREEMENT is dated as of November 4, 1996 by and among
        Thermo Instrument Systems Inc., a Delaware corporation
        ("Seller"), and Thermo Optek Corporation, a Delaware corporation
        ("Buyer").

             WHEREAS, Seller desires to sell, or to cause its
        subsidiaries to sell, all of the shares of capital stock of ARL
        Applied Research Laboratories S.A. ("ARL") owned by the Seller
        (the "Shares") and the Buyer wishes to buy the Shares;

             NOW, THEREFORE, in consideration of the premises and mutual
        promises and agreements set forth herein, the parties hereto
        hereby agree as follows:

             1.  Purchase and Sale of Shares.    The Seller hereby sells,
        assigns, transfers, conveys, and delivers all of the Seller's
        right, title and interest in and to the Shares to the Buyer.  In
        consideration for the Shares, the Buyer shall pay to the Seller
        the sum of  $34,004,000  in cash (the "Purchase Price").  The
        Buyer and Seller acknowledge and agree that such Purchase Price
        represents the sum of (i) the net tangible assets of ARL (assumed
        to be $12,486,000) as of the date of the Seller's acquisition of
        the Shares as part of the acquisition on March 29, 1996 by the
        Seller and its subsidiaries of certain businesses of Fisons plc
        (the "Fisons Businesses") pursuant to the Amended and Restated
        Asset and Stock Purchase Agreement dated as of March 29, 1996
        among the Seller, Thermo Electron Corporation and Fisons plc (the
        "Restated Agreement"), plus (ii) a percentage of the total
        goodwill associated with the Seller's acquisition of the Fisons
        Businesses equal to the sales of ARL for the 1994 and 1995 fiscal
        years relative to the total sales of the Fisons Businesses for
        such years (the "ARL Percentage"), plus (iii) the ARL Percentage
        of the total costs incurred by the Seller in acquiring the Fisons
        Businesses and in restructuring the sales and service
        organization of the Fisons Businesses (the "Restructuring
        Costs").  The parties acknowledge that the purchase price paid by
        the Seller for the Fisons Businesses is subject to a post-closing
        adjustment based on the difference between the value of the net
        tangible assets of the Fisons Businesses as shown on the closing
        balance sheet dated as of March 29, 1996 (the "Closing Balance
        Sheet") and the target net tangible asset value provided for in
        the Restated Agreement.  In the event of any such adjustment, the
        Purchase Price shall be recalculated in accordance with the third
        sentence of this paragraph to account for (A) any adjustment in
        the net tangible assets (other than cash) of ARL as shown on the
        Closing Balance Sheet from $12,486,000), and (B) any adjustment
        in the total goodwill associated with Thermo's acquisition of the
        Fisons Businesses.  In addition, the purchase price shall be
        subject to recalculation in accordance with the third sentence of
        this paragraph in the event that the Restructuring Costs incurred
        are less than $2,453,000.  If any recalculation made pursuant to
        this paragraph results in an increase in the Purchase Price, the
PAGE
<PAGE>
        Buyer shall pay the amount of such increase to the Seller, and if
        any such recalculation results in a decrease in the Purchase
        Price, the Seller shall pay the amount of such decrease to the
        Buyer.  Any payment made pursuant to the preceding sentence shall
        be made within ten days after the Closing Balance Sheet has
        become final (in the case of an adjustment related to the Closing
        Balance Sheet) and no later than March 29, 1997 (in the case of
        an adjustment related to the Restructuring Costs) and shall also
        be accompanied by interest from the date hereof calculated as
        provided in Section 4.1 of the Restated Agreement.

             2.   Further Assurances.  At the request of the Buyer at any
        time on or after the date hereof, the Seller will execute and
        deliver such further instruments of transfer and conveyance and
        take such other action as the Buyer reasonably may request
        effectively to assign and transfer to the Buyer the Shares.  

             3.   The Seller's Representations and Warranties.  The
        Seller represents and warrants that:

                  (a)  Organization and Standing.  The Seller is a
        corporation duly organized, validly     existing and in good
        standing under the laws of the State of Delaware.

                  (b)  Approval of Transactions.  The Seller has obtained
             all necessary corporate authorizations and approvals, and
             has taken all actions required for the execution and
             delivery of this Agreement and the consummation of the
             transactions contemplated hereby.

                  (c)  No Conflict.  Neither the execution nor delivery
             of this Agreement, nor the consummation of the transactions
             herein contemplated, nor the fulfillment of or compliance
             with the terms and provisions hereof will (1) conflict with
             the Certificate of Incorporation or By-laws of the Seller or
             the organizational documents of ARL, (2) violate any current
             provisions of law, administrative regulation, or court
             decree applicable to the Seller or ARL, (3) require the
             consent or approval of any governmental authority except for
             Swiss Lex Friederich approval, or (4) conflict with or
             result in a breach of any of the terms, conditions or
             provisions of or constitute default under any material
             agreement or instrument to which the Seller or ARL is a
             party or by which either is bound.

                  (d)  Capitalization of ARL.   The Shares constitute all
             of the issued and outstanding share capital of ARL.  The
             Shares have been duly authorized, validly issued and are
             fully paid and non-assessable.  The Seller holds good and
             marketable title to the Shares and will transfer the Shares
             to the Buyer pursuant to this Agreement free and clear of
             any liens, claims or encumbrances whatsoever.  No share
             capital of ARL is reserved for issuance, and there are no
             options, warrants, convertible securities or other rights,

                                        2PAGE
<PAGE>
             agreements or commitments obligating ARL to issue any share
             capital.

             4.   The Buyer's Representations and Warranties.

                  (a)  Organization and Standing.  The Buyer is a
             corporation duly organized, validly existing and in good
             standing under the laws of the State of Delaware.

                  (b)  Approval of Transactions.  The Buyer has obtained
             all necessary corporate authorizations and approvals, and
             has taken all actions required for the execution and
             delivery of this Agreement and the consummation of the
             transactions contemplated hereby.

                  (c)  No Conflict.  Neither the execution nor delivery
        of this Agreement, nor the         consummation of the
        transactions herein contemplated, nor the fulfillment of or 
                  compliance with the terms and provisions hereof will
        (1) conflict with the                   Certificate of
        Incorporation or By-laws of the Buyer, (2) violate any current
        provisions          of law, administrative regulation, or court
        decree applicable to the Buyer, (3) require the              
        consent or approval of any governmental authority or (4) conflict
        with or result in a breach    of any of the terms, conditions or
        provisions of or constitute default under any material 
        agreement or instrument to which the Buyer is a party or by which
        it is bound.

             5.   Indemnification.

                  (a)  The Seller agrees to indemnify and hold harmless
        the Buyer from any and all damages, losses, liabilities, costs
        and expenses (including, without limitation, settlement costs and
        any reasonable legal, accounting or other expenses for
        investigating or defending any actions or threatened actions)
        incurred by the Buyer as a result of (i) any liability,
        commitment or obligation of ARL or any of its subsidiaries that
        result from any third party claim based upon the acts or
        omissions of ARL or such subsidiaries on or after March 29, 1996
        and prior to the effective date hereof,  (ii) the inaccuracy of
        any representation or warranty contained in Section 3 hereof or
        (iii) the breach by the Seller of any provision hereof.

                  (b)  The Buyer agrees to indemnify and hold harmless
        the Seller from any and all damages, losses, liabilities, costs
        and expenses (including, without limitation, settlement costs and
        any reasonable legal, accounting or other expenses for
        investigating or defending any actions or threatened actions)
        incurred by the Seller as a result of (i) the inaccuracy of any
        representation or warranty contained in Section 4 hereof, or (ii)
        the breach by the Buyer of any provision hereof.

                                        3PAGE
<PAGE>
                  (c)  Whenever any claim shall arise for indemnification
        hereunder, the party seeking indemnification (the "Indemnified
        Party") shall promptly notify the other party (the "Indemnifying
        Party") of the claim and, when known, the facts constituting the
        basis for such claim.  In the event of any such claim for
        indemnification hereunder resulting from or in connection with
        any claim or legal proceedings by a third party, the notice to
        the Indemnifying Party shall specify, if known, the amount or an
        estimate of the amount of the liability arising therefrom.  The
        Indemnified Party shall not settle or compromise any claim by a
        third party for which the Indemnified Party is entitled to
        indemnification hereunder without the prior consent of the
        Indemnifying Party, unless suit shall have been instituted
        against the Indemnified Party and the Indemnifying Party shall
        not have taken control of such suit after notification thereof as
        provided in Section 5(d) of this Agreement.

                  (d)  In connection with any claim giving rise to
        indemnity hereunder resulting from or arising out of any claim or
        legal proceeding by a person who is not a party to this
        Agreement, the Indemnifying Party at its sole cost and expense
        may, upon notice to the Indemnified Party, assume the defense of
        any such claim or legal proceeding if it acknowledges to the
        Indemnified Party its obligations to indemnify the Indemnified
        Party with respect to all elements of such claim.  The
        Indemnified Party shall be entitled to participate in (but not
        control) the defense of any such action, with its counsel and at
        its own expense.  If the Indemnifying Party does not assume the
        defense of any such claim or litigation resulting therefrom
        within 30 days after the date the Indemnifying Party is notified
        of such claim pursuant to Paragraph 5(c) hereof, (i) the
        Indemnified Party may defend against such claim or litigation,
        after giving notice of the same to the Indemnifying Party, on
        such terms as are appropriate in the Indemnified Party's
        reasonable judgment, and (ii) the Indemnifying Party shall be
        entitled to participate in (but not control) the defense of such
        action, with its counsel and at its own expense.

             6.   Restated Agreement.  The Seller hereby assigns to the
        Buyer, and the Buyer hereby accepts and asssumes,  the Seller's
        rights and obligations under the Restated Agreement, and any
        agreements or instruments excuted by the Seller in connection
        therewith, but only to the extent such rights and obligations
        relate primarily ARL.  In furtherance of the foregoing, the Buyer
        may enforce, in its own name and in the name and on behalf of the
        Seller, any of the rights of the Seller under Section 11 of the
        Restated Agreement, and, if requested by the Buyer, the Seller
        shall take such actions, at its own expense, as the Buyer shall
        reasonably request in order that the Buyer shall have the full
        rights and benefits granted to it under this Section 6.
        .     
             7.   Transfer and Sales Tax.  Notwithstanding any provisions
        of law to the contrary, the Seller shall be responsible for and


                                        4PAGE
<PAGE>
        shall pay all sales, transfer or stamp taxes, if any, upon the
        sale or transfer of the Shares hereunder.

             8.   Effective Date.  The transfer of the Shares shall be
        deemed to be effective as of the date hereof.

             9.   Captions.  The captions and headings to the various
        sections, paragraphs and exhibits of this Agreement are for
        convenience of reference only and shall not affect or control the
        meaning or interpretation of any of the provisions of this
        Agreement.

             10.  Integration.  This Agreement contains the entire
        understanding of the parties hereto with respect to the subject
        matter contained herein.

             11.  Notice of Communication.  Any notice or other
        communication shall be in writing and shall be personally
        delivered, or sent by overnight or second day courier or by first
        class mail, return receipt requested, to the party to whom such
        notice or other communication is to be given or made at such
        party's address set forth below, or to such other address as such
        party shall designate by written notice to the other party as
        follows:

             If to the Seller:

                  Thermo Instrument Systems Inc.
                  c/o Thermo Electron Corporation
                  81 Wyman Street
                  P.O. Box 9046
                  Waltham, MA  02445-9046
                  Attn: General Counsel

             If to the Buyer:

                  c/o Thermo Optek Corporation
                  81 Wyman Street
                  P.O. Box 9046
                  Waltham, MA  02445-9046
                  Attn: General Counsel

        provided that any notice of change of address, and any notice or
        other communication given otherwise than as specified above shall
        be effective only upon receipt; and further that any presumption
        of receipt by the addressee shall be inoperable during the period
        of any interruption in Postal Service.

             12.  Survival of Representations and Warranties.  All
        representations and warranties made by the Seller or the Buyer in
        this Agreement shall survive the execution and delivery of this
        Agreement.

                                        5PAGE
<PAGE>
             13.  Governing Law; Assignment.  This Agreement is to be
        construed, interpreted, applied and governed in all respects in
        accordance with the laws of the Commonwealth of Massachusetts,
        without regard to its conflict of laws provisions, is to take
        effect as a sealed instrument, is binding upon and inures to the
        benefit of the parties hereto and their respect successors and
        assigns and may be canceled, modified or amended only by a
        written instrument executed by the Seller and the Buyer.  No
        party hereto may assign its rights hereunder without prior
        written consent of the other party.


























                                        6PAGE
<PAGE>
                  IN WITNESS WHEREOF, the parties hereto have executed
        this Agreement as of the date and year first above written.


                                 THERMO OPTEK CORPORATION


                                 By:  Robert J. Rosenthal
                                     ------------------------------------
                                      Robert J. Rosenthal
                                      Senior Vice President


                                 THERMO INSTRUMENT SYSTEMS INC.



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


                            INDEMNIFICATION AGREEMENT


             This Agreement is made as of November 4, 1996 between Thermo
        Instrument Systems Inc., a Delaware corporation ("THI"), and
        Thermo Optek Corporation, a Delaware corporation ("TOC").

             WHEREAS, on March 29, 1996 THI, directly and through its
        subsidiaries, purchased certain businesses of Fisons plc (the
        "Fisons Businesses") pursuant to an Amended and Restated Asset
        and Stock Purchase Agreement dated as of such date (the "Restated
        Agreement"); and

             WHEREAS, THI and TOC have agreed that the ARL and Elemental
        Fisons Businesses (the "TOC Businesses") shall be sold by THI to
        TOC; and

             WHEREAS, the sale by THI, and the purchase by TOC, of the
        TOC Businesses shall be made pursuant to a number of purchase and
        sale agreements among subsidiaries of TOC, THI and subsidiaries
        of THI (the "Transfer Agreements"); and

             WHEREAS, THI and TOC desire to make certain provisions for
        (i) THI's indemnification of TOC and its subsidiaries for certain
        liabilities of the TOC Businesses and (ii) TOC's indemnification
        of THI and its subsidiaries for certain liabilities of the TOC
        Businesses.

             NOW, THEREFORE, THI and TOC hereby agree as follows:

             1.   Indemnification.
                  ---------------

                  (a)  THI shall indemnify and hold harmless TOC and its
        subsidiaries from any and all damages, losses, liabilities, costs
        and expenses (including, without limitation, settlement costs and
        any reasonable legal, accounting or other expenses for
        investigating or defending any actions or threatened actions)
        incurred by TOC or any of its subsidiaries as a result of:

                       (i)  any third party claims based on the acts or
        omissions of THI or any of its subsidiaries (including any
        subsidiaries subsequently sold to TOC) on or after March 29, 1996
        and prior to the date hereof; or

                       (ii) the breach by THI or any of its subsidiaries
        of any representation, warranty, covenant or agreement contained
        in any of the Transfer Agreements.

                  (b)  TOC shall indemnify and hold harmless THI and its
        subsidiaries form any and all damages, losses, liabilities, costs
        and expenses (including, without limitation, settlement costs and
        any reasonable legal, accounting or other expenses for
PAGE
<PAGE>
        investigating or defending any actions or threatened actions)
        incurred by THI or any of its subsidiaries (other than
        subsidiaries acquired by TOC) as a result of any liability of the
        TOC Businesses other than a liability (i) as to which TOC and its
        subsidiaries are entitled to indemnification by THI hereunder or
        (ii) that is expressly retained by THI or any of its subsidiaries
        pursuant to any Transfer Agreement.

                  (c)  Whenever any claim shall arise for indemnification
        hereunder, the party seeking indemnification (the "Indemnified
        Party") shall promptly notify the other party (the "Indemnifying
        Party") of the claim and, when known, the facts constituting the
        basis for such claim.  In the event of any such claim for
        indemnification hereunder resulting from or in connection with
        any claim or legal proceedings by a third party, the notice to
        the Indemnifying Party shall specify, if known, the amount or an
        estimate of the amount of the liability arising therefrom.  The
        Indemnified Party shall not settle or compromise any claim by a
        third party for which the Indemnified Party is entitled to
        indemnification hereunder without the prior consent of the
        Indemnifying Party, unless suit shall have been instituted
        against the Indemnified Party and the Indemnifying Party shall
        not have taken control of such suit after notification thereof as
        provided in Section 2(d) of this Agreement.

                  (d)  In connection with any claim giving rise to
        indemnity hereunder resulting from or arising out of any claim or
        legal proceeding by a person who is not a party to this
        Agreement, the Indemnifying Party at its sole cost and expense
        may, upon notice to the Indemnified Party, assume the defense of
        any such claim or legal proceeding if it acknowledges to the
        Indemnified Party its obligations to indemnify the Indemnified
        Party with respect to all elements of such claim.  The
        Indemnified Party shall be entitled to participate in (but not
        control) the defense of any such action, with its counsel and at
        its own expense.  If the Indemnifying Party does not assume the
        defense of any such claim or litigation resulting therefrom
        within 30 days after the date the Indemnifying Party is notified
        of such claim pursuant to Paragraph 2(c) hereof, (i) the
        Indemnified Party may defend against such claim or litigation,
        after giving notice of the same to the Indemnifying Party, on
        such terms as are appropriate in the Indemnified Party's
        reasonable judgment, and (ii) the Indemnifying Party shall be
        entitled to participate in (but not control) the defense of such
        action, with its counsel and at its own expense.

             3.   Restated Agreement.  THI hereby assigns to TOC, and TOC
        hereby accepts and assumes, the rights and obligations of THI
        under the Restated Agreement, and any agreements or instruments
        executed by THI in connection therewith, but only to the extent
        such rights and obligations relate primarily to the TOC
        Businesses.  In furtherance of the foregoing, TOC may enforce, in
        its own name and in the name and on behalf of THI, any of the
        rights of THI under Section 11 of the Restated Agreement, and, if
PAGE
<PAGE>
        requested by TOC, THI shall take such actions, at its own
        expense, as TOC shall reasonably request in order that TOC shall
        have the full rights and benefits granted to it under this
        Section 3.
         
             4.   Captions.  The captions and headings to the various
        sections, paragraphs and exhibits of this Agreement are for
        convenience of reference only and shall not affect or control the
        meaning or interpretation of any of the provisions of this
        Agreement.

             5.   Integration.  This Agreement contains the entire
        understanding of the parties hereto with respect to the subject
        matter contained herein.

             6.   Notice of Communication.  Any notice or other
        communication shall be in writing and shall be personally
        delivered, or sent by overnight or second day courier or by first
        class mail, return receipt requested, to the party to whom such
        notice or other communication is to be given or made at such
        party's address set forth below, or to such other address as such
        party shall designate by written notice to the other party as
        follows:

             If to THI:

                  Thermo Instrument Systems Inc.
                  c/o Thermo Electron Corporation
                  81 Wyman Street
                  P.O. Box 9046
                  Waltham, MA  02445-9046
                  Attn: General Counsel

             If to TOC:

                  Thermo Optek Corporation
                  81 Wyman Street
                  P.O. Box 9046
                  Waltham, MA  02445-9046
                  Attn: General Counsel

        provided that any notice of change of address, and any notice or
        other communication given otherwise than as specified above shall
        be effective only upon receipt; and further that any presumption
        of receipt by the addressee shall be inoperable during the period
        of any interruption in Postal Service.

             7.   Governing Law; Assignment.  This Agreement is to be
        construed, interpreted, applied and governed in all respects in
        accordance with the laws of the Commonwealth of Massachusetts,
        without regard to its conflict of laws provisions, is to take
        effect as a sealed instrument, is binding upon and inures to the
        benefit of the parties hereto and their respect successors and
        assigns and may be canceled, modified or amended only by a
PAGE
<PAGE>
        written instrument executed by THI and TOC.  No party hereto may
        assign its rights hereunder without prior written consent of the
        other party.
PAGE
<PAGE>

             IN WITNESS WHEREOF, the parties hereto have executed this
        Agreement as of the date and year first above written.

                                 THERMO INSTRUMENT SYSTEMS INC.



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


                                 THERMO OPTEK CORPORATION



                                 By:  Robert J. Rosenthal
                                    -------------------------------------
                                      Robert J. Rosenthal
                                      Senior Vice President



                            THERMO OPTEK CORPORATION

                         STOCK HOLDINGS ASSISTANCE PLAN

        SECTION 1.   Purpose.

             The purpose of this Plan is to benefit Thermo Optek
        Corporation  (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
        Guidelines.  

        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 Optek Corporation, a Delaware corporation.

             Guidelines:  The Stock Holdings Guidelines for Key Employees
        of the Company, as established by the Committee 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 Optek Corporation Stock Holdings
        Assistance Plan, as amended from time to time.

        SECTION 3.     Administration.

             The Plan and the Guidelines shall be administered by the
        Committee, which shall have authority to interpret the Plan and
        the Guidelines 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 interpretations and decisions with
        regard to the Plan and the Guidelines and such rules and
        regulations as may be established thereunder shall be final and
PAGE
<PAGE>
        conclusive.  The Committee may correct any defect or supply any
        omission or reconcile any inconsistency in the Plan or the
        Guidelines, 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 Guidelines 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 Guidelines 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 Guidelines.  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 Guidelines,
        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 in five equal annual installments
        commencing on the first anniversary date of the making of such
        Loan.  Each Loan shall also become immediately due and payable in
        full, without demand, upon  the occurrence of any of the events

                                        2PAGE
<PAGE>
        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.






























                                        3PAGE
<PAGE>
        SECTION 7.     Amendment and Termination of the Plan.

             The Committee may from time to time alter or amend the Plan
        or the Guidelines in any respect, or terminate the Plan or the
        Guidelines 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 Guidelines 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 Guidelines shall become effective upon
        approval and adoption by the Committee.







                                        4PAGE
<PAGE>
                                                          EXHIBIT A


                            THERMO OPTEK CORPORATION

                                 Promissory Note



        $_________                                                       
                                                Dated:____________


             For value  received, ________________,  an individual  whose
        residence is located at _______________________ (the "Employee"),
        hereby  promises  to  pay   to  Thermo  Optek  Corporation   (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 the Company,  on
        each of the first four anniversary  dates of the date hereof,  an
        amount equal to 20% of the initial principal amount of the  Note.
        Payment of the final 20% of  the initial principal amount, if  no
        demand has been made by the Company, 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 Holdings 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;

                  (c)  the failure  of the  Employee to  pay his  or  her
             debts as they  become due, the  insolvency of the  Employee,

                                        5PAGE
<PAGE>
             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
        Holdings 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 11
                            THERMO OPTEK CORPORATION

                        Computation of Earnings per Share

                                                   Three Months Ended
                                           ----------------------------------
                                           September 28,        September 30,
                                                    1996                 1995
   --------------------------------------------------------------------------
   Computation of Primary Earnings
     per Share:

   Net Income (a)                            $ 6,426,000         $ 3,916,000
                                             -----------         -----------

   Shares:
     Weighted average shares outstanding      48,410,440          45,000,000

     Add: Shares issuable from
          assumed exercise of options
          (as determined by the
          application of the treasury
          stock method)                                -             157,040
                                             -----------         -----------
     Weighted average shares outstanding,
       as adjusted (b)                        48,410,440          45,157,040
                                             -----------         -----------
   Primary Earnings per Share (a) / (b)      $       .13         $       .09
                                             ===========         ===========
PAGE
<PAGE>
                            THERMO OPTEK CORPORATION

                  Computation of Earnings per Share (continued)

                                                    Nine Months Ended
                                           ----------------------------------
                                           September 28,        September 30,
                                                    1996                 1995
   --------------------------------------------------------------------------
   Computation of Primary Earnings
     per Share:

   Net Income (a)                            $16,146,000         $12,445,000
                                             -----------         -----------

   Shares:
     Weighted average shares outstanding      46,389,560          45,000,000

     Add: Shares issuable from
          assumed exercise of options
          (as determined by the
          application of the treasury
          stock method)                           52,347             157,040
                                             -----------         -----------
     Weighted average shares outstanding,
       as adjusted (b)                        46,441,907          45,157,040
                                             -----------         -----------
   Primary Earnings per Share (a) / (b)      $       .35         $       .28
                                             ===========         ===========


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO OPTEK
CORP.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 28, 1996
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               SEP-28-1996
<CASH>                                         114,166
<SECURITIES>                                         0
<RECEIVABLES>                                   78,497
<ALLOWANCES>                                     5,781
<INVENTORY>                                     60,794
<CURRENT-ASSETS>                               276,907
<PP&E>                                          73,365
<DEPRECIATION>                                  20,347
<TOTAL-ASSETS>                                 537,456
<CURRENT-LIABILITIES>                          181,135
<BONDS>                                         96,819
                                0
                                          0
<COMMON>                                           485
<OTHER-SE>                                     240,883
<TOTAL-LIABILITY-AND-EQUITY>                   241,368
<SALES>                                        253,682
<TOTAL-REVENUES>                               253,682
<CGS>                                          134,987
<TOTAL-COSTS>                                  134,987
<OTHER-EXPENSES>                                16,644
<LOSS-PROVISION>                                 1,483
<INTEREST-EXPENSE>                               4,974
<INCOME-PRETAX>                                 28,157
<INCOME-TAX>                                    12,011
<INCOME-CONTINUING>                             16,146
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    16,146
<EPS-PRIMARY>                                      .35
<EPS-DILUTED>                                        0
        

</TABLE>


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