THERMOQUEST CORP \DE\
POS AM, 1997-04-02
LABORATORY ANALYTICAL INSTRUMENTS
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             As filed with the Securities and Exchange Commission on
                                  April 2, 1997
                                                                    
                                                                         
                                            Registration No. 333-10055
                                                                         
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549

                               ------------------
                         POST-EFFECTIVE AMENDMENT NO. 1
                            ON FORM S-3 TO FORM S-1
                             Registration Statement
                                      Under
                           The Securities Act of 1933

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

                             THERMOQUEST CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)

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

                               Delaware               77-0407461
              (State or other Jurisdiction of      (I.R.S. Employer
             Incorporation or Organization)      Identification Number)

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

                             355 River Oaks Parkway
                         San Jose, California 95134-1991
                                 (408) 577-1053
          (Address, Including Zip Code, and Telephone Number, Including
            Area Code, of Registrant's Principal Executive Offices)

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

                          Sandra L. Lambert, Secretary
                             ThermoQuest Corporation
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                 P. O. Box 9046
                             Waltham, MA  02254-9046
                                 (617) 622-1000
            (Name, Address, Including Zip Code, and Telephone Number,
                   Including Area Code, of Agent For Service)

                                    Copy to:
                           Seth H. Hoogasian, Esquire
                                 General Counsel
                             ThermoQuest Corporation
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                       Waltham, Massachusetts 02254-9046

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

             Approximate date  of commencement  of proposed  sale to  the
        public:   As soon as practicable after the Registration Statement
        has become effective.
PAGE
<PAGE>






             If the only  securities being  registered on  this form  are
        being offered  pursuant  to  dividend  or  interest  reinvestment
        plans, please check the following box.  [   ]

             If any of the securities  being registered on this form  are
        to be offered on a delayed  or continuous  basis pursuant to Rule
        415 under  the  Securities Act  of  1933, other  than  securities
        offered only in connection with dividend or interest reinvestment
        plans, please check the following box.   [ x ]

             If this Form is filed to register additional securities  for
        an offering pursuant  to Rule  462(b) under  the Securities  Act,
        please check  the  following  box and  list  the  Securities  Act
        registration  statement   number   of   the   earlier   effective
        registration statement  for the  same  offering.   [       ]

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

             If this Form is a post-effective amendment filed pursuant to
        Rule 462(c) under the Securities Act, check the following box and
        list the  Securities Act  registration  statement number  of  the
        earlier effective registration statement  for the same  offering.
        [   ]
                ------------------

             If delivery  of  the  prospectus  is  expected  to  be  made
        pursuant to Rule 434, please check the following box.   [   ]

        The Registrant hereby amends this Registration Statement on  such
        date or dates  as may be  necessary to delay  its effective  date
        until  the  Registrant  shall  file  a  further  amendment  which
        specifically         states  that  this  Registration  Statement   shall
        thereafter become effective  in accordance with  Section 8(a)  of
        the Securities Act of 1933  or until this Registration  Statement
        shall become effective  on such  date as  the Commission,  acting
        pursuant to said Section 8(a), may determine.




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





        PROSPECTUS

                                5,833,333 Shares

                             THERMOQUEST CORPORATION

                                  Common Stock

             This Prospectus relates to   5,833,333 shares (the "Shares")
        of Common Stock, par value  $.01 per share (the "Common  Stock"),
        of  ThermoQuest  Corporation   (the  "Company"),  issuable   upon
        conversion of  $96,250,000  principal  amount  of  the  Company's
        outstanding 5% Convertible Subordinated Debentures due 2000  (the
        "Debentures").  The Debentures are convertible, at the option  of
        the holder (a  "Selling Shareholder"), at  a conversion price  of
        $16.50 per share, subject to adjustment for certain events.   The
        Shares may be offered  from time to time  in transactions on  the
        American Stock Exchange, in negotiated transactions, through  the
        writing of  options  on the  Shares,  or a  combination  of  such
        methods of sale, at fixed prices  that may be changed, at  market
        prices prevailing at the time of sale, at prices related to  such
        prevailing  market  prices  or   at  negotiated  prices.     Such
        transactions may be effected by selling the Shares to or  through
        broker-dealers, and such broker-dealers may receive  compensation
        in the form  of discounts,  concessions or  commissions from  the
        Selling Shareholders and/or the purchasers of the Shares for whom
        such broker-dealers may  act as  agent or  to whom  they sell  as
        principal,  or   both  (which   compensation  to   a   particular
        broker-dealer might be in excess of customary commissions).   The
        Selling Shareholders and any broker-dealer who acts in connection
        with  the  sale  of  Shares   hereunder  may  be  deemed  to   be
        "underwriters" as that term is  defined in the Securities Act  of
        1933, as  amended (the  "Securities  Act"), and  any  commissions
        received by  them and  profit  on any  resale  of the  Shares  as
        principal might  be  deemed  to  be  underwriting  discounts  and
        commissions under the Securities Act.   See "Sale of Shares"  and
        "Selling Shareholders."
                                  _____________

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

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





        registered hereby.    The Company  has  agreed to  indemnify  the
        Selling  Shareholders  against  certain  liabilities,   including
        liabilities under the Securities Act as underwriter or otherwise.

                                  _____________

             ThermoQuest  is  a   majority-owned  subsidiary  of   Thermo
        Instrument  Systems  Inc.  ("Thermo  Instrument"),  which  is   a
        majority-owned subsidiary of Thermo Electron Corporation ("Thermo
        Electron").  The  Common Stock  is traded on  the American  Stock
        Exchange under the symbol "TMQ".  On March 27, 1997, the reported
        closing price of the Common Stock on the American Stock  Exchange
        was $14.50 per share.

                                  _____________

        The date of this Prospectus is ____________________________, 1997






































                                        2
PAGE
<PAGE>





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


                              AVAILABLE INFORMATION

             The Company is subject to the informational requirements  of
        the Securities Exchange  Act of 1934,  as amended (the  "Exchange
        Act"),  and  in   accordance  therewith   files  reports,   proxy
        statements and other information with the Securities and Exchange
        Commission (the "Commission").   Such  reports, proxy  statements
        and other information can be  inspected and copied at the  public
        reference facilities maintained  by the Commission  at 450  Fifth
        Street, N.W.,  Washington,  D.C.  20549,  and  at  the  following
        Regional Offices of  the Commission:   500  West Madison  Street,
        Suite 1400,  Chicago,  Illinois  60661,  and  Seven  World  Trade
        Center, Suite 1300,  New York, New  York 10048.   Copies of  such
        material can also be obtained  from the Public Reference  Section
        of the Commission  at 450  Fifth Street,  N.W., Washington,  D.C.
        20549 at prescribed rates.   The Commission also maintains a  Web
        site at (http:\\www.sec.gov).  The Common Stock of the Company is
        listed on the  American Stock  Exchange, and  the reports,  proxy
        statements and other  information filed by  the Company with  the
        Commission can be inspected at the offices of the American  Stock
        Exchange, 86 Trinity Place, New York, New York 10006.

             The Company  has filed  with the  Commission a  registration
        statement (together with all amendments and exhibits thereto, the
        "Registration Statement") under the  Securities Act with  respect
        to the  securities  offered hereby.    This Prospectus  does  not
        contain all  of the  information set  forth in  the  Registration
        Statement, certain parts of which are omitted in accordance  with
        the rules  and  regulations  of  the  Commission.    For  further
        information, reference  is made  to the  Registration  Statement,
        copies of  which  may  be  obtained  upon  payment  of  the  fees
        prescribed by the Commission from the Public Reference Section of
        the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
        and at the  Commission's regional  offices at  Seven World  Trade


                                        3
PAGE
<PAGE>





        Center, New York, New York, 10048 and at 500 West Madison Street,
        Chicago, Illinois, 60661.

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


                                   THE COMPANY

             The Company was incorporated in  Delaware in June 1995 as  a
        wholly  owned  subsidiary  of  Thermo  Instrument.    After   the
        formation of the  Company, Thermo Instrument  transferred to  the
        Company all of the assets, liabilities and businesses of Finnigan
        Corporation, which conducts the  Company's mass spectrometry  and
        gas chromatography  businesses,  and Thermo  Separation  Products
        Inc.,  which   conducts  the   Company's  liquid   chromatography
        business.   Unless  the context  requires  otherwise,  references
        herein to the  Company refer to  ThermoQuest Corporation and  its
        subsidiaries and to  the predecessor businesses  as conducted  by
        Thermo Instrument, including acquired businesses from their dates
        of acquisition.   The Company's principal  executive offices  are
        located at 355 River Oaks Parkway, San Jose, California 95134 and
        its telephone number is (408) 577-1053.

                              SELLING SHAREHOLDERS

             The   Selling   Shareholders   currently   hold   Debentures
        convertible into  the  Shares  which  are  the  subject  of  this
        Prospectus.  It is unknown if, when or in what amounts a  Selling
        Shareholder may  offer  Shares  for  sale and  there  can  be  no
        assurance that the Selling Shareholders  will sell any or all  of
        the Shares offered hereby.

             Because the Selling  Shareholders may offer  all or some  of
        the  Shares  pursuant  to  the  offering  contemplated  by   this
        Prospectus,  and  because  there  are  currently  no  agreements,
        arrangements or understandings with respect to the sale of any of
        the Shares that will  be held by  the Selling Shareholders  after
        completion of this offering, no estimate  can be given as to  the
        amount  of  the  Shares  that   will  be  held  by  the   Selling
        Shareholders after completion of this  offering.  To the best  of
        the  Company's  knowledge,  none  of  the  Selling   Shareholders
        currently owns any shares of Common Stock.

             Other than as a result  of the ownership of the  Debentures,
        to the  best of  the  Company's knowledge,  none of  the  Selling

                                        4
PAGE
<PAGE>





        Shareholders,  other  than  Thermo  Electron,  had  any  material
        relationship with the Company within the three year period ending
        on the date of this Prospectus.

             The names of the Selling Shareholders, the principal  amount
        of Debentures held by each of them, and the number of shares into
        which such Debentures are convertible are set forth below.

                                                     Number of
                                      Principal      Shares
        Name                          Amount         into which
        ----
                                      of             Debentures
                                      --
                                      Debentures     are
                                      ----------     ---
                                                     Convertible(1)
                                                     --------------


        Akkad & Co.                     $1,500,000   90,909        
                                                                   
        Atwell & Co.                   1,590,000     96,362        
                                                                   
        Auer & Co.                       800,000     48,484        
                                                                   

        Bear Stearns Securities Corp.  2,446,000     148,241       
                                                                   
        Bost & Co.                     7,100,000     430,302       
                                                                   
        Catamaran & Co.                1,160,000     70,303        
                                                                   

        Comdisco Foundation                200,000   12,121        
                                                                   
        Cudd & Co.                       700,000     42,424        
                                                                   
        Darier Hentsch Private Bank &    500,000     30,303        
        Trust Ltd.                                                 

        DeckAnchor & Co.                 750,000     45,454        
                                                                   
        DeepNet & Co.                    150,000     9,090         
                                                                   
        Ell & Co.                        400,000     24,242        
                                                                   

        Forbank & Co.                  2,741,000     166,121       
                                                                   
        Fuelship & Co.                   405,000     24,545        
                                                                   

        Gerlach & Co.                  1,560,000     94,545        
                                                                   
        Hare & Co.                      11,720,000   710,303       
                                                                   


                                        5
PAGE
<PAGE>





        J. Romeo & Co.                 5,570,000     337,575       
                                                                   

        Kane & Co.                       400,000     24,242        
                                                                   
        Lehman Brothers Inc.           6,000,000     363,636       
                                                                   
                                                     Number of
                                      Principal      Shares
        Name                          Amount         into which
        ----                          of             Debentures
                                      Debentures     are
                                      -----------    ---
                                                     Convertible(1)
                                                     --------------


        Loco & Co.                     1,050,000     63,636        
                                                                   
        Loews Corporation              500,000       30,303        
                                                                   
        Muico & Co.                    3,594,000     217,818       
                                                                   

        Northman & Co.                   600,000     36,363        
                                                                   
        Pitt & Co.                     2,485,000     150,606       
                                                                   
        Polly & Co.                      200,000     12,121        
                                                                   

        Nicholas Pontikees as Trustee    150,000     9,090         
        for the William                                            
          Pontikes Family Trust U/A
        dated 6/21/85
        William Pontikes                 150,000     9,090         
                                                                   
        Salkeld & Co.                    935,000     56,666        
                                                                   

        Tamarack & Co.                 1,905,000     115,454       
                                                                   
        Terrapin & Co.                   290,000     17,575        
                                                                   

        Thermo Electron Corporation     10,000,000   606,060       
                                                                   
        ABN Amro Bank (Schweiz)          125,000     7,575         
                                                                   
        Agen & Co.                         500,000   30,303        
                                                                   

        Alexandria Oeanic Corp.          200,000     12,121        
                                                                   



                                        6
PAGE
<PAGE>





        Aries Trading Limited          200,000       12,121        
                                                                   

        Artistic Investments Ltd.      250,000       15,151        
                                                                   
        Bank J. Vontobel & Co. AG      100,000       6,060         
                                                                   
        Bank of Butterfield            50,000        3,030         
                                                                   

        Bank of Montreal               250,000       15,151        
                                                                   
        Bank Sarasin et Cie            525,000       31,818        
                                                                   
        Bank Nationale de Paris        225,000       13,636        
        (Suisse) S.A.                                              

        Bober & Co.                     10,365,000   628,181       
                                                                   
        Boyd & Co.                     1,000,000     60,606        
                                                                   
        C.D.C./E.T.                    169,000       10,242        
                                                                   

        C.O. Nominees Limited          250,000       15,151        
                                                                   
        Catherine Cartalis and         80,000        4,848         
        Angeliki Verriopoulou                                      
        The Chicago Corporation        60,000        3,636         
                                                                   

        Alexandros Chryssis            50,000        3,030         
                                                                   
        Comar Inc.                     250,000       15,151        
                                                                   

        Compagnie de Gestion et de     250,000       15,151        
        Banque Gonet SA                                            
        Coutts & Co.                   100,000       6,060         
                                                                   
        Credit Agricole Luxembourg     350,000       21,212        
                                                                   

        Credit Suisse Geneva           1,000,000     60,606        
                                                                   
        Darier Hentsche et Cie, Geneva 3,275,000     198,484       
                                                                   








                                        7
PAGE
<PAGE>





                                                     Number of
                                      Principal      Shares
        Name                          Amount         into which
        ----                          of             Debentures
                                      Debentures     are
                                      -----------    ---
                                                     Convertible(1)
                                                     --------------


        Dimitrios and Konstantinos     200,000       12,121        
        Maratsinos                                                 
        Dimitrios Diakopoulos and      50,000        3,030         
        Efimia Chryssis                                            
        Dimitris, Petros & Marios      170,000       10,303        
        Nomikos                                                    

        The Dora Razis 1981 Trust      50,000        3,030         
                                                                   
        Dresdner Securities USA Inc.   25,000        1,515         
                                                                   
        Efal Investment Co.            460,000       27,878        
                                                                   

        Egger & Co.                    555,000       33,636        
                                                                   
        Forvest A/C Lloyds             25,000        1,515         
                                                                   
        Gamma Co. Ltd.                 100,000       6,060         
                                                                   

        Hare & Co.                     1,005,000     60,909        
                                                                   
        Hellenic Mutual Fund of        100,000       6,060         
        International Investments                                  
        Heritage Finance               25,000        1,515         
                                                                   

        George & Aristea Kambanis      100,000       6,060         
                                                                   
        Leung Ltd.                     100,000       6,060         
                                                                   

        Morgan Guaranty Trust Co.      50,000        3,030         
                                                                   
        MSS Nominees Limited           700,000       42,424        
                                                                   
        NatWest New York               550,000       33,333        
                                                                   

        Oddo et Cie                    100,000       6,060         
                                                                   
        Orsenna Ltd.                   50,000        3,030         
                                                                   



                                        8
PAGE
<PAGE>





        Pavlos & Kalliopi Perratis     50,000        3,030         
                                                                   

        The Razis Revocable Trust      100,000       6,060         
                                                                   
        Raytor & Co.                   40,000        2,424         
                                                                   
        Rush & Co.                     3,645,000     220,909       
                                                                   

        Pavlos & Efstathia             100,000       6,060         
        Servetopoulos                                              
        Spume & Co.                    100,000       6,060         
                                                                   
        Swiss America Securities       550,000       33,333        
                                                                   

        TFinn & Co.                    25,000        1,515         
                                                                   
        Vasiolios & Ireni Lezos        50,000        3,030         
                                                                   

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

                                       $96,250,000   5,833,333     
                              TOTAL                                



        (1)  Share amounts set forth in the table do not include
             fractional amounts which will be cashed out at the time of
             any conversion of Debentures into Shares.




                                 SALE OF SHARES

             The Company will not receive  any of the proceeds from  this
        offering.  The  Shares offered hereby  may be sold  from time  to
        time by or for the account of any of the Selling Shareholders  or
        by their pledgees, donees,  distributees or transferees or  other
        successors in interest to the  Selling Shareholders.  The  Shares
        may be  sold  hereunder directly  to  purchasers by  the  Selling
        Shareholders in negotiated transactions; by or through brokers or
        dealers in  ordinary brokerage  transactions or  transactions  in
        which the  broker  solicits purchasers;  throughblock  trades  in
        which the broker  or dealer will  attempt to sell  the Shares  as
        agent but  may position  and resell  a portion  of the  block  as
        principal; transactions in which a broker or dealer purchases  as
        principal for resale for its own account; or through underwriters
        or agents.   The Shares may  be sold at  a fixed offering  price,
        which may be changed, at the prevailing market price at the  time


                                        9
PAGE
<PAGE>





        of sale, at prices related to such prevailing market price or  at
        negotiated prices.  Any brokers, dealers, underwriters or  agents
        may arrange for others to participate in any such transaction and
        may receive compensation in the form of discounts, commissions or
        concessions from the Selling  Shareholders and/or the  purchasers
        of the Shares.  Each Selling Shareholder will be responsible  for
        payment of any and all commissions to brokers. 

             The aggregate proceeds to  any Selling Shareholder from  the
        sale of the Shares offered  by a Selling Shareholder hereby  will
        be  the  purchase  price  of   such  Shares  less  any   broker's
        commissions.

             In order  to  comply with  the  securities laws  of  certain
        states,  if  applicable,  the  Shares   will  be  sold  in   such
        jurisdiction only  through  registered  or  licensed  brokers  or
        dealers.  In addition,  in certain states the  Shares may not  be
        sold unless they have  been registered or  qualified for sale  in
        the applicable state  or an  exemption from  the registration  or
        qualification requirement is available and is complied with.

             Any Selling  Shareholder  and any  broker-dealer,  agent  or
        underwriter that participates with the Selling Shareholder in the
        distribution of the  Shares may  be deemed  to be  "underwriters"
        within the  meaning of  the Securities  Act, in  which event  any
        commissions  received   by   such   broker-dealers,   agents   or
        underwriters and any profit on the resale of the Shares purchased
        by them may be deemed to be underwriting commissions or discounts
        under the Securities Act.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

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

             (a)  The Company's Annual Report on  Form 10-K for the  year
                  ended December 28, 1996; and

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

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

                                       10
PAGE
<PAGE>





        not be deemed, except as so modified or superseded, to constitute
        a part of this Prospectus.





                                  LEGAL MATTERS

             Certain legal matters relating to the Shares offered  hereby
        have been  passed upon  for  the Company  by Seth  H.  Hoogasian,
        General Counsel  of Thermo  Electron, Thermo  Instrument and  the
        Company.  As of the date of such opinion, Mr. Hoogasian owned  or
        had the right to acquire through exercise of stock options  6,000
        shares of Common Stock, 16,738  shares of common stock of  Thermo
        Instrument and 115,928 shares of common stock of Thermo Electron.


                                     EXPERTS

             The financial statements of the Company incorporated in this
        Prospectus and the financial statement schedules incorporated  in
        the Registration Statement by  reference to the Company's  Annual
        Report on Form  10-K for the  year ended December  28, 1996  have
        been  audited  by   Arthur  Andersen   LLP,  independent   public
        accountants, to the extent  and for the  periods as indicated  in
        their reports with respect  thereto, and are incorporated  herein
        and therein  in  reliance upon  the  authority of  said  firm  as
        experts in giving said reports.


























                                       11
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<PAGE>





                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

        Item 14.  Other Expenses of Issuance and Distribution.

        The expenses in connection with the issuance and distribution  of
        the securities being registered are as follows.  All amounts  are
        estimated,  except   the  Securities   and  Exchange   Commission
        registration fee.

                                                             Amount
                                                             ------

             Securities and Exchange Commission              $30,299
             registration fee  .............................
             Legal fees and expenses  ......................  10,000
             Accounting fees and expenses  .................  10,000

             Miscellaneous  ................................   9,701
                                                            --------
                  Total  ................................... $60,000

        Item 15.  Indemnification of Directors and Officers.

             The Delaware  General  Corporation  Law  and  the  Company's
        Certificate of  Incorporation  and  By-Laws  limit  the  monetary
        liability of directors to the Company and to its stockholders and
        provide  for  indemnification  of  the  Company's  officers   and
        directors for liabilities  and expenses  that they  may incur  in
        such  capacities.  In   general,  officers   and  directors   are
        indemnified with  respect to  actions taken  in good  faith in  a
        manner reasonably believed to be in, or not opposed to, the  best
        interests of the Company, and with respect to any criminal action
        or proceeding,  actions that  the  indemnitee had  no  reasonable
        cause  to  believe   were  unlawful.     The  Company  also   has
        indemnification agreements with its  directors and officers  that
        provide for the maximum indemnification allowed by law.

             Thermo Electron Corporation  has an  insurance policy  which
        insures the officers  and directors  of Thermo  Electron and  its
        subsidiaries, including the Company, against certain  liabilities
        which might be  incurred in  connection with  the performance  of
        their duties.  

        Item 16.  Exhibits.

             See the Exhibit Index included immediately preceding the
        exhibits to this Registration Statement.

        Item 17.  Undertakings.

             (a)  The undersigned Registrant hereby undertakes:




                                     II - 5
PAGE
<PAGE>





                   (1) To file,  during any  period  in which  offers  or
                       sales are being  made, a post-effective  amendment
                       to this registration statement:

                       (i)  To include any prospectus required by Section
                            10(a)(3) of the Securities Act of 1933;

                       (ii) To reflect  in the  prospectus any  facts  or
                            events arising  after the  effective date  of
                            the  registration  statement  (or  the   most
                            recent  post-effective   amendment   thereof)
                            which,  individually  or  in  the  aggregate,
                            represent  a   fundamental  change   in   the
                            information set  forth  in  the  registration
                            statement. Notwithstanding the foregoing, any
                            increase or decrease in volume of  securities
                            offered  (if  the   total  dollar  value   of
                            securities  offered  would  not  exceed  that
                            which was registered) and any deviation  from
                            the low or high and of the estimated  maximum
                            offering range may be  reflected in the  form
                            of  prospectus  filed  with  the   Commission
                            pursuant to Rule 424(b) if, in the aggregate,
                            the changes in volume and price represent  no
                            more than 20  percent change  in the  maximum
                            aggregate offering  price  set forth  in  the
                            "Calculation of  Registration Fee"  table  in
                            the effective registration statement;

                       (iii)     To include any material information with
                            respect  to  the  plan  of  distribution  not
                            previously  disclosed  in  the   registration
                            statement or  any  material  change  to  such
                            information in the registration statement;

                       p  rovided, however,   that paragraphs  (a)(1)(i) and
                       (a)(1)(ii)  do  not  apply  if  the   registration
                       statement is on  Form S-3, Form  S-8 or Form  F-3,
                       and the information required  to be included in  a
                       post-effective amendment  by those  paragraphs  is
                       contained  in  periodic   reports  filed  by   the
                       Registrant pursuant to Section 13 or Section 15(d)
                       of the Securities  Exchange Act of  1934 that  are
                       incorporated  by  reference  in  the  registration
                       statement.

                  (2)  That, for the purpose of determining any liability
                       under  the  Securities  Act  of  1933,  each  such
                       post-effective amendment shall be  deemed to be  a
                       new  registration   statement  relating   to   the
                       securities offered  therein, and  the offering  of
                       such securities at that time shall be deemed to be
                       the initial bona fide offering thereof.


                                     II - 6
PAGE
<PAGE>





                  (3)  To  remove  from  registration   by  means  of   a
                       post-effective amendment  any  of  the  securities
                       being  registered  which  remain  unsold  at   the
                       termination of the offering.

                  (4)  If the registrant is a foreign private issuer,  to
                       file   a   post-effective    amendment   to    the
                       registration statement  to include  any  financial
                       statements required by Rule  3-19 of this  chapter
                       at the start of any delayed offering or throughout
                       a continuous offering.   Financial statements  and
                       information otherwise required by Section 10(a)(3)
                       of the Act need  not be furnished,  provided  , that
                       the registrant  includes  in  the  prospectus,  by
                       means of  a  post-effective  amendment,  financial
                       statements required  pursuant  to  this  paragraph
                       (a)(4) and other  information necessary to  ensure
                       that all other information in the prospectus is at
                       least as current  as the date  of those  financial
                       statements.  Notwithstanding  the foregoing,  with
                       respect to registration statements on Form F-3,  a
                       post-effective amendment  need  not  be  filed  to
                       include  financial   statements  and   information
                       required by Section  10(a)(3) of the  Act or  Rule
                       3-19 of this chapter if such financial  statements
                       and information are contained in periodic  reports
                       filed with or furnished  to the Commission by  the
                       registrant pursuant to Section 13 or Section 15(d)
                       of the Securities  Exchange Act of  1934 that  are
                       incorporated by reference in the Form F-3.

             (b)  The undersigned Registrant hereby undertakes that,  for
        purposes of determining any liability under the Securities Act of
        1933, each filing of the  Registrant's annual report pursuant  to
        Section 13(a) or Section 15(d) of the Securities Exchange Act  of
        1934  (and, where applicable, each filing of an employee  benefit
        plan's annual report pursuant to Section 15(d) of the  Securities
        Exchange Act of 1934) that  is incorporated by reference in  this
        registration statement shall be deemed  to be a new  registration
        statement relating  to the  securities  offered herein,  and  the
        offering of such securities  at that time shall  be deemed to  be
        the initial bona fide offering thereof.





             (c)  Insofar  as  indemnification  for  liabilities  arising
        under the Securities Act of  1933 may be permitted to  directors,
        officers and controlling  persons of the  Registrant pursuant  to
        the foregoing provisions, or  otherwise, the Registrant has  been
        advised that  in  the  opinion of  the  Securities  and  Exchange
        Commission such  indemnification  is  against  public  policy  as
        expressed in the Act  and is, therefore,  unenforceable.  In  the

                                     II - 7
PAGE
<PAGE>





        event that a claim  for indemnification against such  liabilities
        (other than the payment by the Registrant of expenses incurred or
        paid  by  a  director,  officer  or  controlling  person  of  the
        Registrant in  the  successful defense  of  any action,  suit  or
        proceeding) is asserted by such director, officer or  controlling
        person in connection  with the securities  being registered,  the
        Registrant will, unless in the opinion of its counsel the  matter
        has been settled by controlling  precedent, submit to a court  of
        appropriate    jurisdiction    the    question    whether    such
        indemnification by it  is against public  policy as expressed  in
        the Act and will  be governed by the  final adjudication of  such
        issue.











































                                     II - 8
PAGE
<PAGE>





                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of  1933,
        the Registrant hereby certifies that it has reasonable grounds to
        believe that it meets all of the requirements for filing on  Form
        S-3 and has duly  caused this Post-Effective  Amendment No. 1  to
        Registration  Statement  to  be  signed  on  its  behalf  by  the
        undersigned, thereunto duly authorized,  in the City of  Waltham,
        Commonwealth of Massachusetts, on this 1st day of April, 1997.

                                      THERMOQUEST CORPORATION


                                 By:  /s/ Dr. Richard W.K. Chapman*
                                    -----------------------------------
rd W.K. Chapman*    

        -
                                  Dr. Richard W.K. Chapman
                                  President and Chief Executive Officer

             Pursuant to the requirements of the Securities Act of  1933,
        this Post-Effective Amendment No. 1 to Registration Statement has
        been signed below by the following persons in the capacities  and
        on the dates indicated:

        /s/  Dr. Richard W.K. Chapman President and Chief April 1, 1997
        -----------------------------
        Dr. Richard W.K. Chapman      Executive Officer

        /s/ John N. Hatsopoulos*      Vice President
        ------------------------------
        John N. Hatsopoulos           (Chief Financial    April 1, 1997
                                       Officer)

        /s/ Paul F. Kelleher*         Chief Accounting
        -----------------------------
        Paul F. Kelleher              Officer             April 1, 1997

        /s/ Arvin H. Smith*           Chairman of the
        ------------------------------
        Arvin H. Smith                Board and           April 1, 1997
                                      Director

        /s/ Dr. George N. Hatsopoulos* Director           April 1, 1997
        -------------------------------
        Dr. George N. Hatsopoulos

        /s/ Frank Jungers*             Director           April 1, 1997
        -------------------------------
        Frank Jungers

        /s/ Anthony J. Pellegrino*     Director           April 1, 1997
        -------------------------------
        Anthony J. Pellegrino

        /s/ Dr. Michael E. Porter*     Director           April 1, 1997
        -------------------------------
        Dr. Michael E. Porter







                                     II - 9
PAGE
<PAGE>







        *    The undersigned  Sandra  L.  Lambert, by  signing  her  name
        hereto, does hereby execute  this Post-Effective Amendment No.  1
        to Registration Statement  on behalf of  each of the  above-named
        persons pursuant to powers of  attorney executed by such  persons
        and filed with the Securities and Exchange Commission.


                                      /s/Sandra L. Lambert
                                      -----------------------------
                                      Sandra L. Lambert
                                      Attorney-in-Fact 











































                                     II - 10
PAGE
<PAGE>





                                  EXHIBIT INDEX


        Exhibit                                         Sequential
        Number         Description of Exhibit           Page No.
        ------         ----------------------           --------

             4         Specimen Common Stock Certificate (incorporated
                       by reference from the corresponding exhibit to
                       the Registrant's Registration Statement on Form
                       S-1 (Commission File No. 333-00276))

             5*        Opinion of Seth H. Hoogasian, Esq.

            23.1       Consent of Arthur Andersen LLP 

             23.2*     Consent of Seth H. Hoogasian, Esq. (included in
                       Exhibit 5)

             24        Power of Attorney (See Signature Page)


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

        *   Previously filed as part of this registration statement.








        AA970760037


































                                                Exhibit 23.1



                    Consent of Independent Public Accountants


             As independent public accountants, we hereby consent to the
        incorporation by reference in this registration statement on Form
        S-3 of our reports dated February 11, 1997, included in or
        incorporated by reference into ThermoQuest Corporation's Annual
        Report on Form 10-K for the year ended December 28, 1996, and to
        all references to our Firm included in this registration
        statement.


                                           /s/ Arthur Andersen LLP
                                           -----------------------


        Boston, Massachusetts



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