THERMO TERRATECH INC
S-2, 1996-04-04
TESTING LABORATORIES
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                   As filed with the Securities and Exchange 
                          Commission on April 4, 1996  
                                                                         
                                           Registration No. 333-______ 
                                                                      

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549
                               __________________

                                    FORM S-2
                             Registration Statement
                                      Under
                           The Securities Act of 1933
                               __________________
                                         
                              THERMO TERRATECH INC. 
              (Exact name of registrant as specified in its charter)

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

                                    Delaware
         (State or other jurisdiction of incorporation or organization)

                                   04-2925807
                      (I.R.S. Employer Identification No.)
                               __________________

                                81 Wyman Street  
                       Waltham, Massachusetts  02254-9046
                                 (617) 622-1000
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices) 
                               __________________

                          Sandra L. Lambert, Secretary
                             Thermo TerraTech Inc.  
                         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)

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

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





             Approximate date of commencement of proposed sale to the
        public:  The Common Stock Purchase Warrants may be sold as soon
        as practicable after the Registration Statement has become
        effective.  The Common Stock underlying such Warrants may be sold
        as soon as practicable after the Registration Statement has
        become effective and after the exercise of such Warrants.

             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, check the following box.   
        [ x ]  

             If the registrant elects to deliver its latest annual report
        to security holders, or a complete and legible facsimile thereof,
        pursuant to Item 11(a)(1) of this Form, check the following box.
        [   ]
                             ______________________

                         CALCULATION OF REGISTRATION FEE


        Title of each              Proposed     Proposed
          class of                  Maximum     Maximum
         securities     Amount     Offering    Aggregate     Amount of
            to be        to be     Price Per Offering Price Registration
         registered   registered   Unit (1)       (1)           Fee

        Common Stock    512,500       ---         ---         None (2)
          Purchase     warrants
          Warrants
        Common Stock,   512,500     $10.00   $5,125,000.00
          $.10 par      shares                               $1,768.00
          value per
           share 
        Common Stock    188,000       ---         ---         None (2)
          Purchase     warrants
          Warrants

        Common Stock,   188,000     $11.34   $2,131,920.00    $736.00
          $.10 par      shares
          value per
           share 
                                                 Total       $2,504.00
        _____________________

        (1)  Estimated solely for the purpose of calculating the amount
             of the registration fee in accordance with Rule 457(g) under
             the Secuities Act of 1933.  The calculation of the proposed
             maximum aggregate offering price has been based upon the
             price at which the Common Stock Purchase Warrants may be
             exercised.

        (2)  Pursuant to Rule 457(g).

                                        2
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<PAGE>





                              ______________________

             THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON
        SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVENESS
        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.

                                        <










































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                             Thermo TerraTech Inc.  
                         Common Stock Purchase Warrants 
                                and Common Stock

                              Cross Reference Sheet
                    Between Items of Form S-2 and Prospectus  


        Item                                    Location in Prospectus
        ----                                    ----------------------

          1. Forepart of the Registration 
             Statement and Outside Front 
             Cover Page of Prospectus........   Outside Front Cover Page

          2. Inside Front and Outside Back 
             Cover Pages of Prospectus.......   Inside Front and Outside 
                                                Back Cover Pages

          3. Summary Information, Risk Factors 
             and Ratio of Earnings to Fixed 
             Charges.........................   The Company

          4. Use of Proceeds.................   Use of Proceeds

          5. Determination of Offering Price.   Description of Warrants

          6. Dilution........................   Not Applicable

          7. Selling Security Holders........   Selling Securityholders; 
                                                Sale of Securities

          8. Plan of Distribution............   Cover Page; Selling 
                                                Securityholders; Sale of
                                                Securities

          9. Description of Securities to 
             be Registered...................   Cover Page; Description 
                                                of Warrants; Description 
                                                of Common Stock

        10.  Interests of Named Experts 
             and Counsel.....................   Experts; Legal Matters

        11.  Information with Respect to 
             the Registrant..................   Cover Page; The Company; 
                                                Recent Developments; 
                                                Description of Warrants; 
                                                Description of Common 
                                                Stock 

        12.  Incorporation of Certain 
             Information by Reference........   Incorporation of Certain 
                                                Information by Reference

                                        4
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<PAGE>





        13.  Disclosure of Commission 
             Position on Indemnification 
             for Securities Act 
             Liabilities.....................        Not Applicable


















































                                        5
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<PAGE>







        PROSPECTUS


                             THERMO TERRATECH INC.  

                     Warrants to Purchase 700,500 Shares of
                                Common Stock and
                         700,500 Shares of Common Stock
                     Issuable Upon Exercise of Such Warrants

             This Prospectus relates to (i) the reoffer and resale of
        Common Stock Purchase Warrants (the "Warrants") to purchase
        700,500 shares of Common Stock, par value $.10 per share (the
        "Common Stock"), of Thermo TerraTech Inc. (the "Company"), and
        (ii) the issuance of 700,500 shares of Common Stock (the
        "Shares") that may be acquired upon exercise of the Warrants.
        The Warrants and/or the Shares are sometimes referred to in this
        Prospectus interchangeably as the "Securities."  The Warrants may
        be offered by certain securityholders of the Company (the
        "Selling Securityholders") from time to time in negotiated
        transactions, at fixed prices that may be changed, at market
        prices prevailing at the time of sale, at prices related to such
        prevailing market prices or at negotiated prices.  The Selling
        Securityholders may effect such transactions by selling the
        Warrants to or through broker-dealers, and such broker-dealers
        may receive compensation in the form of discounts, concessions or
        commissions from the Selling Securityholders and/or the
        purchasers of the Warrants 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 Securityholders and any
        broker-dealer who acts in connection with sales of the Warrants
        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 Warrants as principal might be deemed
        to be underwriting discounts and commissions under the Securities
        Act.  See "Selling Securityholders."  
                                  _____________

             None of the proceeds from the sale of the Warrants by the
        Selling Securityholders 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 Securityholders) in
        connection with the registration and sale of the Securities being
        registered hereby.  The Company has agreed to indemnify the
        Selling Securityholders against certain liabilities, including
        liabilities under the Securities Act as underwriter or otherwise.
                                  _____________


                                        6
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<PAGE>





        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.

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

             The Company is a majority-owned subsidiary of Thermo
        Electron Corporation ("Thermo Electron").  The Common Stock is
        traded on the American Stock Exchange under the symbol "TTT."
        There is no public market for the Warrants.  

         ___________, 1996  



             No dealer, salesman or any other person has been authorized
        to give any information or to make any representations not
        contained in this Prospectus, and, if given or made, such
        information or representations must not be relied upon as having
        been authorized by the Company.  This Prospectus does not
        constitute an offer of any securities other than those to which
        it relates or an offer to sell, or a solicitation of an offer to
        buy, to any person in any jurisdiction where such an offer or
        solicitation would be unlawful.  Neither the delivery of this
        Prospectus nor any sale made hereunder shall, under any
        circumstances, create any implication that the information
        contained herein is correct as of any time subsequent to the date
        hereof.


                              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
        Commission's regional offices at 7 World Trade Center, New York,
        New York 10006 and at 500 West Madison Street, Suite 1400,
        Chicago, Illinois 60661.  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 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 office of the American Stock Exchange, 86
        Trinity Place, New York, New York 10006. 


                                        7
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             The Company has filed with the Commission a Registration
        Statement of Form S-2 under the Securities Act of 1933, as
        amended, with respect to the Securities offered by this
        Prospectus.  This Prospectus omits certain information contained
        in the Registration Statement.  Reference is hereby made to the
        Registration Statement and the exhibits filed as a part thereof
        for further information with respect to the Company and to the
        Securities offered hereby, and any statement herein concerning
        any exhibit is qualified in all respects by the provisions of
        such exhibit.


                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

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

             (1)  The Company's Annual Report on Form 10-K for the year
                  ended April 1, 1995, as amended.

             (2)  The Company's Current Report on Form 8-K filed with the
                  Commission on May 24, 1995 with respect to events
                  occurring on May 9, 1995.

             (3)  The Company's Current Report on Form 8-K filed with the
                  Commission on May 25, 1995 with respect to events
                  occurring on May 10, 1995, as amended.

             (4)  The Company's Quarterly Report on Form 10-Q for the
                  three-month period ended July 1, 1995.

             (5)  The Company's Quarterly Report on Form 10-Q for the
                  three-month period ended September 30, 1995.

             (6)  The Company's Current Report on Form 8-K filed with the
                  Commission on December 14, 1995 with respect to events
                  occurring on December 8, 1995, as amended.

             (7)  The Company's Current Report on Form 8-K filed with the
                  Commission on December 15, 1995 with respect to events
                  occurring on December 13, 1995.

             (8)  The Company's Quarterly Report on Form 10-Q for the
                  three-month period ended December 30, 1995.

             (9)  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.  

             Copies of any such documents, other than exhibits to such
        documents (unless such exhibits specifically are incorporated by
        reference in such documents), are available without charge, upon
        written or oral request, from Thermo TerraTech Inc., c/o Thermo
        Electron Corporation, 81 Wyman Street, P. O. Box 9046, Waltham,
                                        8
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<PAGE>





        Massachusetts 02254-9046, Attention: Sandra L. Lambert, Esq.,
        Secretary; telephone:  (617) 622-1000.  

             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, or in any other
        subsequently filed document that also is or is deemed to be
        incorporated by reference herein, modifies or supersedes such
        statement.  Any such statement so modified or superseded shall
        not be deemed, except as so modified or superseded, to constitute
        part of this Prospectus.


                                   THE COMPANY
         
             The Company is a provider of environmental services and
        infrastructure planning and design, encompassing a range of
        specializations within the consulting and design, remediation and
        recycling, laboratory testing, and metal-treating industries.  

             Consulting and Design - The Company's Bettigole Andrews &
        Clark Inc. and Normandeau Associates Inc. subsidiaries provide
        both private and public sector clients with a range of consulting
        services that address transportation planning and design, and
        natural resource management issues, respectively. In February
        1995, the Company acquired Elson T. Killam Associates Inc., which
        provides environmental consulting and engineering services and
        specializes in wastewater treatment and water resources
        management.

             Remediation and Recycling - The Company's majority-owned
        Thermo Remediation Inc. ("Thermo Remediation") subsidiary
        operates a network of soil-remediation centers, serving customers
        in more than a dozen states by providing thermal treatment of
        soil to remove and destroy petroleum contamination caused by
        leaking underground and aboveground storage tanks, spills, and
        other sources. Thermo Remediation's Thermo Fluids Inc.
        subsidiary, located in Arizona, offers fluids-recycling services
        including waste motor oil and wastewater treatment throughout
        Arizona and in neighboring states.  In addition, Thermo
        Remediation's Remediation Technologies, Inc. subsidiary, acquired
        in December 1995, is an integrated environmental services firm,
        with 15 offices nationwide, that focuses primarily on the
        remediation of former and active industrial sites contaminated
        with organic wastes and residues.   

                  Through its Thermo Nutech division ("Thermo Nutech"),
        Thermo Remediation provides services to remove radioactive
        contaminants from sand, gravel, and soil, as well as health
        physics, radiochemistry laboratory, and radiation dosimetry
        services. Thermo Nutech was formerly part of a joint venture
        between the Company and Thermo Instrument Systems Inc.  

                                        9
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<PAGE>





                  The Company's majority-owned Thermo EuroTech N.V.
        subsidiary, formerly known as J. Amerika N.V. ("Thermo
        EuroTech"), located in the Netherlands, provides wastewater
        treatment services as well as services to test, remove and
        install underground storage tanks.  In March 1995, Thermo
        EuroTech acquired Refining and Trading Holland B.V., which
        specializes in converting "off-spec" and contaminated petroleum
        fluids into usable oil products.  

             Laboratory Testing - The Company's Thermo Analytical Inc.
        subsidiary operates a network of analytical laboratories that
        provide environmental testing services to commercial and
        government clients throughout the U.S. The May 1995 acquisition
        of Lancaster Laboratories expands the Company's range of contract
        services beyond environmental testing to the pharmaceutical- and
        food-testing industries.  

             Metal Treating - The Company performs metallurgical
        processing services, using thermal-treatment equipment at
        locations in California and Minnesota. The Company also designs,
        manufactures, and installs advanced custom-engineered,
        thermal-processing systems through its equipment division located
        in MichigaN.  

             The Company is a majority-owned, publicly traded subsidiary
        of Thermo Electron.  As of December 30, 1995, Thermo Electron
        owned 14,119,858 shares of the Common Stock of the Company,
        representing approximately 81% of such Common Stock outstanding.
        The Company's principal executive offices are located at 81 Wyman
        Street, Waltham, Massachusetts  02254, and its telephone number
        is (617) 622-1000.  

             This Prospectus is accompanied by (i) a copy of the
        Company's Annual Report on Form 10-K, as amended on Form 10-K/A,
        for the fiscal year ended April 1, 1995 and (ii) a copy of the
        Company's Quarterly Report on Form 10-Q for the most recent
        quarter ended after April 1, 1995.  


                               RECENT DEVELOPMENTS

             On May 4, 1995, the Company's Thermo Remediation subsidiary
        issued $37,950,000 aggregate principal amount of its 4 7/8%
        Convertible Subordinated Debentures due 2000.  The debentures are
        convertible at the option of the holders thereof into shares of
        Thermo Remediation's common stock at an initial conversion price
        (subject to future adjustments) of $17.92 per share.   

             On December 8, 1995, Thermo Remediation acquired all of the
        issued and outstanding capital stock of Remediation Technologies,
        Inc. ("RETEC") for a combination of cash and securities having an
        aggregate value of approximately $29.7 million.  The purchase
        price consisted of approximately $18.5 million in cash and units
        consisting of (i) 227,250 shares of Thermo Remediation's common
                                       10
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        stock and (ii) warrants to purchase 75,750 additional shares of
        Thermo Remediation's common stock at an exercise price of $14.85
        per share, such units having an aggregate value of approximately
        $3.7 million.  In addition, Thermo Remediation assumed
        outstanding RETEC stock options and converted such options into
        options to purchase up to 897,000 shares of Thermo Remediation
        common stock.  The shares of such common stock issuable upon
        exercise of such options are subject to certain restrictions on
        resale, which restrictions lapse ratably over a period of five
        years.  As converted, such options have a weighted average
        exercise price of $4.24 per share and were valued in the
        aggregate at approximately $7.5 million.  RETEC recorded revenues
        of approximately $39 million in the fiscal year ended December
        31, 1994.  


                                 USE OF PROCEEDS

             None of the proceeds from the sale of the Warrants by the
        Selling Securityholders will be received by the Company.  The
        proceeds from the exercise of the Warrants, if any, will be used
        by the Company for general corporate purposes.


                             SELLING SECURITYHOLDERS

             The following table shows the names of the Selling
        Securityholders, the number of Warrants each beneficially owned
        as of the date of this Prospectus, the number of Warrants that
        may be offered by each of them pursuant to this Prospectus and
        the number of Warrants each will own after completion of the
        offering (assuming all of the Warrants being offered hereby are
        sold).

                                                               Warrants
                                                                 Owned
                                             Warrants            After
                                               Owned           Completi
                                             Prior to Warrants   on of
               Selling Securityholder           the     Being     the
               ----------------------        Offering  Offered Offering
                                             --------  ------- --------

        Irving B. Harris Revocable Trust       205,500 205,500         0
        dated 7/31/87 (1)
        Roxanne H. Frank Trust dated 3/16/84    64,750  64,750         0
        Couderay Partners                       59,250  59,250         0

        Virginia H. Polsky Trust dated          55,250  55,250         0
        8/5/84
        Jerome Kahn, Jr. Revocable Trust,       21,250  21,250         0
        dated 10/16/87,  Jerome Kahn, Jr.,
        Trustee (2)
        Fred Holubow (3)                        16,500  16,500         0

                                       11
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        Marc A. Neuerman (2)                     7,000   7,000         0

        Yves Micheli                             6,250   6,250         0
        Bear East Partners                      28,060  28,060         0
        Terence M. Hogan                         2,190   2,190         0

        William W. Harris Children Charity       6,000   6,000         0
        Trust dated 11/29/83
        William W. Harris Trust dated           34,000  34,000         0
        6/22/84
        Harris Foundation                       48,000  48,000         0

        Irving B. Harris Foundation              4,000   4,000         0
        John N. Hatsopoulos (4)                 12,500  12,500         0
        Darier, Hentsch & Cie.                  12,500  12,500         0

        Joseph Giamanco (5)                     12,500  12,500         0
        Peter G. Pantazelos (6)                 15,000  15,000         0
        The George & Dora Razis 1981 Trust      10,000  10,000         0
        (7)

        IBH Grandchildren Charity Trust         12,000  12,000         0
        dated 11/29/83
        Donna E. Barrows                        14,000  14,000         0

        June H. Barrows                         20,000  20,000         0
        William Harris Settlor Trust, F/B/O      4,000   4,000         0
        Patricia J. Rosbrow
        Robert L. Barrows                       12,000  12,000         0

        James J. Pelts                           4,000   4,000         0
        Mary Ann Wark                           10,000  10,000         0
        Joan W. Harris                           4,000   4,000         0

            TOTALS                             700,500 700,500         0

        ----------------------------------
        (1)  Mr. Irving B. Harris, trustee of the Irving B. Harris
             Revocable Trust, is also Chairman of the Harris Foundation;
             Chairman of the Irving B. Harris Foundation; a trustee of 
             the William Harris Settlor Trust, F/B/O Patricia J. Rosbrow;
             and the husband of Joan W. Harris, the trustee of the Joan 
             W. Harris Trust.  Accordingly, Mr. Harris may be deemed to 
             own the 48,000, 4,000, 4,000 and 4,000 Warrants, 
             respectively, owned by such entities.  

        (2)  Mr. Jerome Kahn, Jr., trustee of the Jerome Kahn, Jr. 
             Revocable Trust, and Mr. Marc A. Neuerman are also trustees 
             of the Roxanne H. Frank Trust dated 3/16/84; managing agents
             of Couderay Partners; trustees of the Virginia H. Polsky 
             Trust dated 8/5/84; trustees of the William W. Harris 
             Children Charity Trust dated 11/29/83; trustees of the 
             William W. Harris Trust dated 6/22/84; and trustees of the 

                                       12
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             IBH Grandchildren Charity Trust dated 11/29/83.  
             Accordingly, Mr. Kahn and Mr. Neuerman may each be deemed to
             own the 64,750, 59,250, 55,250, 6,000, 34,000 and 12,000 
             Warrants, respectively, owned by such entities.  

        (3)  Mr. Holubow is a Director of the Company's Thermo 
             Remediation subsidiary.

        (4)  Mr. Hatsopoulos is a Vice President, the Chief Financial 
             Officer and a Director of the Company, is an Executive Vice 
             President and the Chief Financial Officer of Thermo Electron
             and is a Vice President and the Chief Financial Officer of 
             the Company's Thermo Remediation subsidiary.

        (5)  Mr. Giamanco is the owner and president of GMH, Inc., which 
             serves as a specialist in the Company's Common Stock on the 
             American Stock Exchange.

        (6)  Mr. Pantazelos is an Executive Vice President of Thermo 
             Electron.

          (7)  Mr. Paris Nicolaides, a consultant to Thermo Electron, 
               is trustee of The George & Dora Razis 1981 Trust.  
               Accordingly, Mr. Nicolaides may be deemed to own the      
               10,000 Warrants owned by such trust.  
         
             The Warrants are being registered to permit public secondary
        trading of the Warrants from time to time by the Selling
        Securityholders.  All of the Warrants were acquired by the
        Selling Securityholders or their affiliates from the Company in
        private placement transactions pursuant to Securities Purchase
        Agreements with the Company dated as of December 20, 1991, March
        20, 1992, June 15, 1992, September 1, 1992, December 16, 1992,
        and March 18, 1993 (the "Purchase Agreements").  The Shares are
        issuable upon exercise of certain of the Warrants at an exercise
        price of $10.00 per Share and upon the exercise of certain other
        Warrants at an exercise price of $11.34 per Share. 

             In the Purchase Agreements, the Company agreed, among other
        things, to bear all expenses (other than underwriting discounts,
        selling commissions, and fees and expenses of counsel and other
        advisors to the Selling Securityholders) in connection with the
        registration and sale of the Warrants being offered by the
        Selling Securityholders.  See "Sale of Securities."  The Company
        has agreed to prepare and file such amendments and supplements to
        the Registration Statement of which this Prospectus forms a part
        as may be necessary to keep the Registration Statement effective
        until all the Warrants offered hereby have been sold pursuant
        thereto or until such Warrants are no longer, by reason of Rule
        144(k) under the Securities Act or any other rule of similar
        effect, required to be registered for the public sale thereof by
        the Selling Securityholders.
         

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                               SALE OF SECURITIES

             The Company has been advised that the Selling
        Securityholders may sell Warrants from time to time in negotiated
        transactions, at fixed prices which may be changed, at market
        prices prevailing at the time of sale, at prices related to such
        prevailing market price or at negotiated prices.  The Selling
        Securityholders may effect such transactions by selling the
        Warrants to or through broker-dealers, and such broker-dealers
        may receive compensation in the form of discounts, concessions or
        commissions from the Selling Securityholders and/or the
        purchasers of the Warrants 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 Securityholders and any broker-dealers who act
        in connection with the sale of Securities hereunder may be deemed
        to be "underwriters" as that term is defined in the Securities
        Act, and any commissions received by them and profit on any
        resale of the Securities as principal might be deemed to be
        underwriting discounts and commissions under the Securities Act.
        The Company has agreed to indemnify the Selling Securityholders
        against certain liabilities, including liabilities under the
        Securities Act as underwriter or otherwise.


                             DESCRIPTION OF WARRANTS

             The following is a brief description of the principal terms
        applicable to the Warrants.

             The Warrants represent the right, exercisable during a
        prescribed period of time, to purchase shares of the Common Stock
        of the Company at prescribed prices.  The Warrants were acquired
        by the Selling Securityholders or their affiliates from the
        Company in private placement transactions pursuant to Purchase
        Agreements dated as of December 20, 1991, March 20, 1992, June
        15, 1992, September 1, 1992, December 16, 1992, and March 18,
        1993.  

             Exercise Period and Procedure.  The registered holder of a
        Warrant may exercise the Warrant, in whole or in part (but not as
        to fractional Shares) at any time and from time to time after the
        date of this Prospectus and prior to the fifth anniversary of
        such date (the "Exercise Period").  Certificates for Shares
        purchased upon exercise of a Warrant will be delivered by the
        Company to the purchaser within ten days after the Company has
        received a completed and executed exercise agreement, in the form
        attached to the Warrant, and a check representing the exercise
        price of the Shares for which the Warrant is exercised (the
        "Exercise Date").  Shares issuable upon the exercise of a Warrant
        will be deemed to have been issued to the purchaser on the
        Exercise Date, and the purchaser will be deemed for all purposes
                                       14
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        to have been the record holder of such Shares on the Exercise
        Date.  Unless an exercised Warrant has expired or all of the
        purchase rights represented thereby have been exercised, the
        Company will prepare a new Warrant, substantially identical
        thereto, representing the rights formerly represented by such
        Warrant which have not expired or been exercised.  The Warrants
        may not be exercised as to fractional Shares.  If a fractional
        Share would otherwise be issuable upon exercise of a Warrant, the
        Company will, within ten days after the Exercise Date, deliver to
        the purchaser a check payable to the purchaser in lieu of such
        fractional share, in an amount equal to the market price of such
        fractional Share as of the close of business on the Exercise
        Date.

             The issuance of certificates for Shares upon exercise of a
        Warrant will be made without charge to the registered holder for
        any issuance tax in respect thereof or any other cost incurred by
        the Company in connection with such exercise and the related
        issuance of such Shares.  The Company will not, however, be
        required to pay any tax which may be payable in respect of any
        transfer, in whole or in part, of any Warrant (including the
        issuance of new Warrants in connection therewith) or the delivery
        of stock certificates in a name other than that of the registered
        holder of a Warrant presented for exercise, and any such tax must
        be paid by such registered holder at the time of presentation.

             The Company will not close its books for the transfer of the
        Warrants or of any Shares issued or issuable upon the exercise on
        the Warrants in any manner which interferes with the timely
        exercise of the Warrants.

             Exercise Price.  The Warrants issued pursuant to the
        Purchase Agreements dated as of December 20, 1991, March 20,
        1992, June 15, 1992 and September 1, 1992 may be exercised at an
        exercise price of $10.00 per Share, and the Warrants issued
        pursuant to the Purchase Agreements dated as of December 16, 1992
        and March 18, 1993 may be exercised at an exercise price of
        $11.34 per Share (as the case may be, the "Exercise Price").  The
        Exercise Price of each Warrant was determined after taking into
        account several factors, including (a) the fair market values of
        the Common Stock underlying the Warrants on their respective
        dates of issuance, (b) the appropriate premiums over such fair
        market values compared to premiums applicable to listed or quoted
        options on similar securities, (c) the degree of volatility in
        such fair market values prior to such issuance and (d) the length
        of the Exercise Period.  

             Adjustments.  In order to prevent dilution of the rights
        granted under the Warrants, both the Exercise Price and the
        number of Shares that may be issued upon exercise of the Warrants
        will be subject to adjustment from time to time if, during the
        Exercise Period, the Company (a) issues any shares of Common
        Stock as a dividend upon Common Stock, or (b) issues any shares
        of Common Stock by reclassification or otherwise, (c) combines
                                       15
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<PAGE>





        outstanding shares of Common Stock, by reclassification or
        otherwise or (d) declares a dividend upon the Common Stock
        payable otherwise than out of earnings or retained earnings and
        otherwise than in Common Stock.  No adjustment of the Exercise
        Price will be made if the amount of such adjustment would be less
        than one cent per Share, but in such case any adjustment that
        would otherwise be required then to be made will be carried
        forward and will be made at the time and together with the next
        subsequent adjustment which, together with any adjustment or
        adjustments so carried forward, would amount to not less than one
        cent per share.  Upon any reorganization or reclassification of
        the capital stock of the Company, or any consolidation or merger
        of the Company with another corporation (other than a
        consolidation or merger in which the Company is the surviving
        entity and which does not result in any change in the Common
        Stock), or any sale or other disposition by the Company of all or
        substantially all of its assets to any other corporation, the
        Warrants will thereafter be exercisable for the number of shares
        of stock or other securities or property of the Company, or of
        the successor corporation resulting from such consolidation or
        merger, as the case may be, to which the Shares (and any other
        securities and property) of the Company, deliverable upon the
        exercise of the Warrants, would have been entitled upon such
        reorganization, reclassification of capital stock, consolidation,
        merger, sale or other disposition if the Warrants had been
        exercised immediately prior to such reorganization,
        reclassification of capital stock, consolidation, merger, sale or
        other disposition.  

             No Voting Rights.  The Warrants will not entitle the holders
        thereof to any voting rights or other rights as stockholders of
        the Company. 

             Miscellaneous.  The Warrants and all rights thereunder are
        transferable, in whole or in part, without charge to the
        registered holder, upon surrender of the Warrants with properly
        executed assignment (in the form attached to the Warrants) at the
        principal office of the Company.  Similarly, the Warrants are
        exchangeable, upon the surrender thereof by the registered holder
        at the principal office of the Company, for new Warrants of like
        tenor representing in the aggregate the purchase rights
        thereunder, and each of such new Warrants will represent such
        portion of such rights as is designated by the registered holder
        at the time of such surrender.  The provisions of the Warrants
        may be amended and the Company may take any action therein
        prohibited, or omit to perform any act therein required to be
        performed by it, only if the Company has obtained the written
        consent of the registered holders of Warrants representing at
        least 50% of the shares obtainable upon the exercise of the
        Warrants outstanding at the time of such consent.




                                       16
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<PAGE>



                          DESCRIPTION OF COMMON STOCK

         
             The following is a brief description of the principal terms
        applicable to the authorized shares of the Company's Common
        Stock.  
         
             Each share of Common Stock is entitled to pro rata
        participation in distributions upon liquidation and to one vote
        on all matters submitted to a vote of stockholders.  Dividends
        may be paid to the holders of Common Stock when and if declared
        by the Board of Directors out of funds legally available
        therefor. Holders of Common Stock have no preemptive or similar
        rights.  The outstanding shares of Common Stock are, and the
        Shares offered hereby will be, legally issued, fully paid and
        nonassessable. 
         
             The shares of Common Stock have noncumulative voting rights,
        which means that the holders of a majority of the shares voting
        can elect all the Directors if they so choose, and in such event,
        the holders of the remaining shares cannot elect any Directors.
        As of December 30, 1995, Thermo Electron beneficially owned
        14,119,858 shares of Common Stock, which represented
        approximately 81% of the then outstanding Common Stock.  It is
        anticipated that Thermo Electron will continue to beneficially
        own at least a majority of the outstanding Common Stock, and will
        have the power to elect all of the members of the Company's Board
        of Directors.  
         
             The Company's Certificate of Incorporation contains certain
        provisions permitted under the General Corporation Law of the
        State of Delaware relating to the liability of Directors.  The
        provisions eliminate a Director's liability for monetary damages
        for a breach of fiduciary duty, except in certain circumstances
        involving wrongful acts or omissions, which involve intentional
        misconduct or a knowing violation of law.  The Company believes
        that these provisions will assist the Company in attracting and
        retaining qualified individuals to serve as Directors and
        officers.  
         
             The transfer agent and registrar for the Common Stock is
        American Stock Transfer and Trust Company. 
         

                                  LEGAL MATTERS
                                         
             Certain legal matters relating to the Securities offered
        hereby have been passed upon for the Company by Seth H.
        Hoogasian, General Counsel of Thermo Electron and of the Company.
        Mr. Hoogasian owns or has the right to acquire through the
        exercise of stock options shares of common stock of Thermo
        Electron, the Company and of certain of their respective
        subsidiaries, the fair market value of which exceeds $50,000.


                                       17
PAGE
<PAGE>


                                 EXPERTS


         
             The financial statements and schedule of the Company for the
        year ended April 1, 1995, incorporated in this Prospectus by
        reference to the Company's Annual Report on Form 10-K, as
        amended, for the year ended April 1, 1995 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 in reliance upon the
        authority of said firm as experts in giving said reports.   

             The financial statements of Lancaster Laboratories, Inc. and
        Clewmark Holdings for the year ended September 30, 1994,
        incorporated in this Prospectus by reference to the Company's
        Current Report on Form 8-K, as amended, dated May 10, 1995 have
        been audited by Trout, Ebersole & Groff, independent public
        accountants, to the extent and for the periods as indicated in
        their report with respect thereto, and are incorporated herein in
        reliance upon the authority of said firm as experts in giving
        said report.  

             The financial statements of Remediation Technologies, Inc.
        for the year ended December 31, 1994, incorporated in this
        Prospectus by reference to the Company's Current Report on Form
        8-K, as amended, dated December 8, 1995 have been audited by KPMG
        Peat Marwick LLP, independent public accountants, to the extent
        and for the periods as indicated in their report with respect
        thereto, and are incorporated herein in reliance upon the
        authority of said firm as experts in giving said report.  

             The financial statements of Remediation Technologies, Inc.
        for the year ended December 31, 1993 and 1992, incorporated in
        this Prospectus by reference to the Company's Current Report on
        Form 8-K, as amended, dated December 8, 1995 have been audited by
        Nardella & Taylor, independent public accountants, to the extent
        and for the periods as indicated in their report with respect
        thereto, and are incorporated herein in reliance upon the
        authority of said firm as experts in giving said report.  

             The financial statements of RETEC/TETRA L.C. appearing in
        the Company's Current Report on Form 8-K, as amended, dated
        December 8, 1995, have been audited by Ernst & Young LLP,
        independent auditors, as set forth in their report thereon
        included therein and incorporated herein by reference.  Such
        financial statements are incorporated herein by reference in
        reliance upon such report given upon the authority of such firm
        as experts in accounting and auditing.  








                                       18
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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 which are being registered hereby
        are as follows.  All amounts shown are estimates, except the
        Securities and Exchange Commission registration fee and the
        American Stock Exchange listing fee.  All expenses are to be paid
        by the Registrant.

                                                                Amount
                                                                ------
        Securities and Exchange Commission 
        registration fee..............................      $   2,504.00
        American Stock Exchange listing
        fee...........................................         14,010.00
        Legal fees and expenses.......................          3,000.00
        Accounting fees and
        expenses......................................          5,000.00
        Miscellaneous.................................          2,000.00
                                                             -----------
             TOTAL....................................        $26,514.00


        Item 15.  Indemnification of Directors and Officers.

             The Delaware General Corporation Law and the Company's
        Restated 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.
        Reference is made to the form of Indemnification Agreement for
        Officers and Directors incorporated by reference as Exhibit 10.10
        hereto.  

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

             The Selling Securityholders are obligated under the
        Securities Purchase Agreements to indemnify Directors, officers
        and controlling persons of the Registrant against certain
        liabilities, including liabilities under the Securities Act.
                                       19
PAGE
<PAGE>







        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:

                   (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 end 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.

                            Provided, however, that paragraphs (a)(1)(i)
                       and (a)(1)(ii) do not apply if the registration
                       statement is on Form S-3 or Form S-8, and the
                       information required to be included in a
                       post-effective amendment by those paragraphs is
                       contained in periodic reports filed by the
                                       20
PAGE
<PAGE>





                       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.

                  (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 Regulation S-X
                       at the start of any delayed offering or throughout
                       a continuous offering.

             (b)  The undersigned Registrant hereby undertakes to deliver
        or cause to be delivered with the prospectus, to each person to
        whom a prospectus is sent or given, the latest annual report to
        security holders that is incorporated by reference in the
        prospectus and furnished pursuant to and meeting the requirements
        of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
        1934; and where interim financial information required to be
        presented by Article 3 of Regulation S-X are not set forth in the
        prospectus, to deliver, or cause to be delivered to each person
        to whom the prospectus is sent or given, the latest quarterly
        report that is specifically incorporated by reference in the
        prospectus to provide such interim financial information.

             (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
        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
                                       21
PAGE
<PAGE>





        indemnification by it is against public policy as expressed in
        the Act and will be governed by the final adjudication of such
        issue.



















































                                       22
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<PAGE>





                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of 1933,
        the Registrant certifies that it has reasonable grounds to
        believe that it meets all of the requirements of filing on Form
        S-2, and has duly caused this Registration Statement to be signed
        on its behalf by the undersigned, thereunto duly authorized, in
        the City of Waltham, Commonwealth of Massachusetts, on this 3rd
        day of April, 1996.  

                                      THERMO TERRATECH INC.  

                                      By: /s/ John P. Appleton    
                                          John P. Appleton
                                          President and Chief 
                                          Executive Officer

             KNOW ALL MEN BY THESE PRESENTS that each individual whose
        signature appears below constitutes and appoints John N.
        Hatsopoulos, Paul F. Kelleher, Seth H. Hoogasian, Sandra L.
        Lambert and Jonathan W. Painter, and each of them, as his true
        and lawful attorneys-in-fact and agents for the undersigned, with
        full power of substitution, for and in the name, place and stead
        of the undersigned, to sign and file with the Securities and
        Exchange Commission under the Securities Act of 1933 any and all
        amendments and exhibits to this Registration Statement and any
        and all applications and other documents to be filed with the
        Securities and Exchange Commission pertaining to the registration
        of the securities covered hereby, with full power and authority
        to do and perform any and all acts and things whatsoever
        requisite and necessary or desirable.

             Pursuant to the requirements of the Securities Act of 1933,
        this Registration Statement has been signed by the following
        persons in the capacities and on the dates indicated.
            
           Signature                  Title                   Date
           ---------                  -----                   ----


        John P. Appleton         President (Chief         April 3, 1996
        John P. Appleton         Executive Officer)
                                 and Director

        John N. Hatsopoulos      Vice President (Chief    April 3, 1996
        John N. Hatsopoulos      Financial Officer) 
                                 and Director

        Paul F. Kelleher         Chief Accounting         April 3, 1996
        Paul F. Kelleher         Officer
           

        George N. Hatsopoulos    Director                 April 3, 1996
        George N. Hatsopoulos

                                       23
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<PAGE>





        Donald E. Noble          Director                 April 3, 1996
        Donald E. Noble            

        William A. Rainville     Chairman of the Board    April 3, 1996
        William A. Rainville     and Director

        Polyvios C. Vintiadis    Director                 April 3, 1996
        Polyvios C. Vintiadis

        _____________________    Director                 April _, 1996
        Paul E. Tsongas  
         










































                                       24
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<PAGE>





                                  EXHIBIT INDEX

        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

          2.1    Asset Purchase Agreement by and among Thermo
                 Analytical Inc. (as Buyer); Lancaster
                 Laboratories, Inc. and Clewmark Holdings (as
                 Sellers); and Earl H. Hess, Anita F. Hess,
                 Kenneth E. Hess, J. Wilson Hershey and Carol D.
                 Hess (as the principal owners of Sellers) (filed
                 as Exhibit 1 to the Registrant's Current Report
                 on Form 8-K relating to the events occurring on
                 May 10, 1995 [File No. 1-9549] and incorporated
                 herein by reference).  

          2.2    Agreement and Plan of Merger dated as of the 1st
                 day of December, 1995, by and among Thermo
                 Remediation Inc.,  TRI Acquisition Inc. and
                 Remediation Technologies, Inc. (filed as Exhibit
                 2(a) to the Registrant's Current Report on Form
                 8-K relating to the events occurring on December
                 8, 1995 [File No. 1-9549] and incorporated herein
                 by reference).  

          4.1    Specimen Common Stock Certificate (filed as
                 Exhibit 4 to the Registrant's Registration
                 Statement on Form S-1 [File No. 33-6736] and
                 incorporated herein by reference). 

          4.2    Specimen Common Stock Purchase Warrant

          4.3    Fiscal Agency Agreement dated August 4, 1989,
                 among the Registrant, Thermo Electron
                 Corporation, and Chemical Bank, as fiscal agent
                 (filed as Exhibit B to the Registrant's Current
                 Report on Form 8-K relating to events occurring
                 on August 4, 1989 [File No. 1-9549] and
                 incorporated herein by reference). 

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

          4.4    Specimen Securities Purchase Agreement

          5.1    Opinion of Seth H. Hoogasian, Esq.





                                       25
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.1    Thermo Electron Corporate Charter as amended and
                 restated effective January 3, 1993 (filed as
                 Exhibit 10(a) to the Registrant's Annual Report
                 on Form 10-K for the fiscal year ended April 3,
                 1993 [File No. 1-9549] and incorporated herein by
                 reference).

         10.2    Amended and Restated Corporate Services Agreement
                 dated January 3, 1993, between Thermo Electron
                 Corporation and the Registrant (filed as Exhibit
                 10(b) to the Registrant's Annual Report on Form
                 10-K for the fiscal year ended April 3, 1993
                 [File No. 1-9549] and incorporated herein by
                 reference).

         10.3    Agreement of Lease dated December 31, 1985,
                 between Claridge Properties Ltd. and Thermo
                 Electron Corporation (filed as Exhibit 10(c) to
                 the Registrant's Registration Statement on Form
                 S-1 [Reg. No. 33-6763] and incorporated herein by
                 reference).

         10.4    Assignment of Lease dated December 31, 1985,
                 between Thermo Electron Corporation and TMO, Inc.
                 (filed as Exhibit 10(d) to the Registrant's
                 Registration Statement on Form S-1 [Reg. No.
                 33-6763] and incorporated herein by reference).

         10.5    Sublease dated March 30, 1986, between TMO, Inc.
                 and Holcroft/Loftus, Inc. (filed as Exhibit 10(e)
                 to the Registrant's Registration Statement on
                 Form S-1 [Reg. No. 33-6763] and incorporated
                 herein by reference).

          10.6   Lease Amending Agreement dated January 1, 1995,
                 between Claridge Properties Ltd., Thermo Electron
                 Corporation and TMO, Inc. (filed as Exhibit 10.6
                 to the Registrant's Annual Report on Form 10-K
                 for the year ended April 1, 1995 [File No.
                 1-9549] and incorporated herein by reference).  

          10.7   License Agreement, dated December 30, 1989,
                 between Degussa Aktiengasellschaft and
                 Holcroft/Loftus, Inc. (filed as Exhibit 10(f) to
                 the Registrant's Annual Report on Form 10-K for
                 the year ended March 31, 1990 [File No. 1-9549]
                 and incorporated herein by reference). 




                                       26
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

          10.8   License Agreement dated June 26, 1992, by and
                 between Holcroft Inc. and Camlaw Ltd. (filed as
                 Exhibit 10(g) to the Registrant's Annual Report
                 on Form 10-K for the fiscal year ended April 3,
                 1993 [File No. 1-9549] and incorporated herein by
                 reference). 

          10.9   Exclusive License and Marketing Agreement dated
                 March 22, 1990, among TPS Technologies Inc.,
                 Holcroft Inc., and Thermo Soil Recyclers Inc.
                 (filed as Exhibit 10(q) to the Registrant's
                 Annual Report on Form 10-K for the year ended
                 March 30, 1990 [File No. 1-9549] and incorporated
                 herein by reference). 

         10.10   Form of Indemnification Agreement with Directors
                 and Officers (filed as Exhibit 10(k) to the
                 Registrant's Annual Report on Form 10-K for the
                 year ended March 30, 1991 [File No. 1-9549] and
                 incorporated herein by reference). 

         10.11   Development Agreement dated September 15, 1991,
                 between Thermo Electron Corporation and the
                 Registrant (filed as Exhibit 10(l) to the
                 Registrant's Quarterly Report on Form 10-Q for
                 the fiscal quarter ended September 28, 1991 [File
                 No. 1-9549] and incorporated herein by
                 reference). 

         10.12   Amended and Restated Development Agreement dated
                 January 2, 1992, between Thermo Electron
                 Corporation and the Registrant (filed as Exhibit
                 10(m) to the Registrant's Annual Report on Form
                 10-K for the year ended March 28, 1992 [File No.
                 1-9549] and incorporated herein by reference). 

         10.13   Asset Transfer Agreement dated as of October 1,
                 1993 among the Registrant, TPS Technologies Inc.
                 and Thermo Remediation Inc. (filed as Exhibit 2.3
                 to Thermo Remediation Inc.'s Registration
                 Statement on Form S-1 [Reg. No. 33-70544] and
                 incorporated herein by reference). 

         10.14   Exclusive License Agreement dated as of October
                 1, 1993 among the Registrant, TPS Technologies
                 Inc. and Thermo Remediation Inc. (filed as
                 Exhibit 2.4 to Thermo Remediation Inc.'s
                 Registration Statement on Form S-1 [Reg. No.
                 33-70544] and incorporated herein by reference). 


                                       27
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.15   Non-Competition and Non-Disclosure Agreement
                 dated as of October 1, 1993 among the Registrant,
                 TPS Technologies Inc. and Thermo Remediation Inc.
                 (filed as Exhibit 2.5 to Thermo Remediation
                 Inc.'s Registration Statement on Form S-1 [Reg.
                 No. 33-70544] and incorporated herein by
                 reference). 

         10.16   Tax Allocation Agreement dated as of June 1, 1992
                 between the Registrant and Thermo Remediation
                 Inc. (filed as Exhibit 10.3  to Thermo
                 Remediation Inc.'s Registration Statement on Form
                 S-1 [Reg. No. 33-70544] and incorporated herein
                 by reference). 

         10.17   Agreement of Partnership dated May 16, 1994 among
                 Terra Tech Labs Inc. (a wholly owned subsidiary
                 of the Registrant) and Eberline Analytical
                 Corporation, Skinner & Sherman, Inc., TMA/NORCAL
                 Inc., Normandeau Associates Inc., Bettigole
                 Andrews & Clark Inc., Fellows, Read & Associates
                 Inc. and Thermo Consulting Engineers Inc. (each a
                 wholly owned subsidiary of Thermo Instrument
                 Systems Inc.) (filed as Exhibit 1 to the
                 Registrant's Current Report on Form 8-K dated May
                 16, 1994 [File No. 1-9549] and incorporated
                 herein by reference). 

         10.18   Promissory Note dated May 16, 1994 issued by the
                 Registrant to Thermo Electron Corporation (filed
                 as Exhibit 2 to the Registrant's Current Report
                 on Form 8-K dated May 16, 1994 [File No. 1-9549]
                 and incorporated herein by reference). 

         10.19   Agreement of Dissolution of Partnership dated May
                 9, 1995 among Thermo Terra Tech (the
                 Partnership), Terra Tech Labs, Inc. (a wholly
                 owned subsidiary of the Registrant) and Eberline
                 Analytical Corporation, Skinner & Sherman, Inc.,
                 TMA/NORCAL Inc., Normandeau Associates Inc.,
                 Bettigole Andrews & Clark Inc., Fellows, Read &
                 Associates Inc. and Thermo Consulting Engineers
                 Inc. (each a wholly owned subsidiary of Thermo
                 Instrument Systems Inc.) (filed as Exhibit 2.1 to
                 the Registrant's Current Report on Form 8-K
                 relating to the events occurring on May 9, 1995
                 [File No. 1-9549] and incorporated herein by
                 reference). 



                                       28
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.20   Stock Purchase Agreement dated May 9, 1995
                 between the Registrant and Thermo Instrument
                 Systems Inc. (filed as Exhibit 2.2 to the
                 Registrant's Current Report on Form 8-K relating
                 to the events occurring on May 9, 1995 [File No.
                 1-9549] and incorporated herein by reference). 

         10.21   Note dated May 17, 1995 from the Registrant to
                 Thermo Electron Corporation  (filed as Exhibit
                 2.3 to the Registrant's Current Report on Form
                 8-K relating to the events occurring on May 9,
                 1995 [File No. 1-9549] and incorporated herein by
                 reference). 

         10.22   Stock Purchase and Note Issuance Agreement dated
                 as of November 22, 1993, between the Registrant
                 and Thermo Remediation Inc. (filed as Exhibit
                 10.11 to Thermo Remediation Inc.'s Registration
                 Statement on Form S-1 [Reg. No. 33-70544] and
                 incorporated herein by reference). 

         10.23   $2,650,000 principal amount Subordinated
                 Convertible Note dated as of November 22, 1993,
                 made by Thermo Remediation Inc., issued to the
                 Registrant (filed as Exhibit 10.12 to Thermo
                 Remediation Inc.'s Registration Statement on Form
                 S-1 [Reg. No. 33-70544] and incorporated herein
                 by reference). 

        10.24    Asset Purchase Agreement dated as of November 19,
                 1993 by and among All Western Oil, Inc. and
                 certain affiliates thereof and Thermo Fluids Inc.
                 (filed as Exhibit 10.13 to Thermo Remediation
                 Inc.'s Registration Statement on Form S-1 [Reg.
                 No. 33-70544] and incorporated herein by
                 reference). 

         10.25   First Addendum, dated as of August 7, 1994, to
                 Asset Purchase Agreement dated as of November 19,
                 1993 by and among All Western Oil, Inc. and
                 certain affiliates thereof and Thermo Fluids Inc.
                 (filed as Exhibit 10.1 to Thermo Remediation
                 Inc.'s Quarterly Report on Form 10-Q for the
                 fiscal quarter ended October 1, 1994 [File No.
                 1-12636] and incorporated herein by reference). 






                                       29
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.26   Promissory Note in the principal amount of
                 $700,000, dated August 7, 1994 (filed as Exhibit
                 10.2 to Thermo Remediation Inc.'s Quarterly
                 Report on Form 10-Q for the fiscal quarter ended
                 October 1, 1994 [File No. 1-12636] and
                 incorporated herein by reference). 

         10.27   Security Agreement dated as of August 7, 1994
                 among All Western Oil, Inc. and certain
                 affiliates thereof and Thermo Fluids Inc. (filed
                 as Exhibit 10.3 to Thermo Remediation Inc.'s
                 Quarterly Report on Form 10-Q for the fiscal
                 quarter ended October 1, 1994 [File No. 1-12636]
                 and incorporated herein by reference). 

         10.28   Escrow Agreement dated as of the 1st day of
                 December, 1995, by and among Thermo Remediation
                 Inc., Robert W. Dunlap and Thomas M. Zimmer, as
                 Indemnification Representatives, and State Street
                 Bank & Trust Company, as Escrow Agent  (filed as
                 Exhibit 2(b) to the Registrant's Current Report
                 on Form 8-K relating to the events occurring on
                 December 8, 1995 [File No. 1-9549] and
                 incorporated herein by reference). 

         10.29   Form of Non-Negotiable Common Stock Purchase
                 Warrant  (filed as Exhibit 2(c) to the
                 Registrant's Current Report on Form 8-K relating
                 to the events occurring on December 8, 1995 [File
                 No. 1-9549] and incorporated herein by
                 reference). 

         10.30   Master Repurchase Agreement dated January 1, 1994
                 between the Registrant and Thermo Electron
                 Corporation (filed as Exhibit 10.21 to the
                 Registrant's Annual Report on Form 10-K for the
                 fiscal year ended April 1, 1994 [File No. 1-9549]
                 and incorporated herein by reference). 

         10.31   Master Reimbursement Agreement dated January 1,
                 1994 between the Registrant, Thermo Electron
                 Corporation, and Thermo Remediation Inc. (filed
                 as Exhibit 10.22 to the Registrant's Annual
                 Report on Form 10-K for the fiscal year ended
                 April 1, 1994 [File No. 1-9549] and incorporated
                 herein by reference). 





                                       30
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.32   Incentive Stock Option Plan of the Registrant
                 (filed as Exhibit 10(h) to the Registrant's
                 Registration Statement on Form S-1 [Reg. No.
                 33-6763] and incorporated herein by reference).
                 (Maximum number of shares issuable is 1,850,000
                 shares, after adjustment to reflect share
                 increases approved in 1987, 1989 and 1992,
                 6-for-5 stock splits effected in July 1988 and
                 March 1989, and 3-for-2 stock split effected in
                 September 1989). 

         10.33   Nonqualified Stock Option Plan of the Registrant
                 (filed as Exhibit 10(i) to the Registrant's
                 Registration Statement on Form S-1 [Reg. No.
                 33-6763] and incorporated herein by reference).
                 (Maximum number of shares issuable is 1,850,000
                 shares, after adjustment to reflect share
                 increases approved in 1987, 1989 and 1992,
                 6-for-5 stock splits effected in July 1988 and
                 March 1989, and 3-for-2 stock split effected in
                 September 1989). 

         10.34   Deferred Compensation Plan for Directors of the
                 Registrant (filed as Exhibit 10(k) to the
                 Registrant's Registration Statement on Form S-1
                 [Reg. No. 33-6763] and incorporated herein by
                 reference).

         10.35   Equity Incentive Plan of the Registrant (filed as
                 Exhibit 10.63 to Thermedics Inc.'s Annual Report
                 on Form 10-K for the fiscal year ended January 1,
                 1994 [File No. 1-9567] and incorporated herein by
                 reference). (Maximum number of shares issuable is
                 1,750,000 shares, after adjustment to reflect
                 share increase approved in 1994). 

         10.36   Directors Stock Option Plan, as amended effective
                 September 23, 1993 (filed as Exhibit 10(z) to the
                 Registrant's Quarterly Report on Form 10-Q for
                 the fiscal quarter ended October 2, 1993 [File
                 No. 1-9549] and incorporated herein by
                 reference). 

         10.37   Severance Agreement with Thomas P. Plunkett dated
                 August 31, 1993 (filed as Exhibit 10(aa) to the
                 Registrant's Quarterly Report on Form 10-Q for
                 the fiscal quarter ended October 2, 1993 [File
                 No. 1-9549] and incorporated herein by
                 reference). 


                                       31
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

                 In addition to the stock-based compensation plans
                 of the Registrant, the executive officers of the
                 Registrant may be granted awards under
                 stock-based compensation plans of the
                 Registrant's parent, Thermo Electron Corporation,
                 and its subsidiaries, for services rendered to
                 the Registrant or to such affiliated
                 corporations. Such plans are listed under
                 Exhibits 10.38 - 10.105. 

         10.38   Thermo Process Systems Inc. - Thermo Remediation
                 Inc. Nonqualified Stock Option Plan (filed as
                 Exhibit 10(l) to the Registrant's Quarterly
                 Report on Form 10-Q for the fiscal quarter ended
                 January 1, 1994 [File No. 1-9549] and
                 incorporated herein by reference). 

        10.39    Thermo Electron Corporation Incentive Stock
                 Option Plan (filed as Exhibit 4(d) to Thermo
                 Electron's Registration Statement on Form S-8
                 [Reg. No. 33-8993] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 9,035,156 shares, after adjustment to reflect
                 share increases approved in 1984 and 1986, share
                 decrease approved in 1989, and 3-for-2 stock
                 splits effected in October 1986, October 1993 and
                 May 1995). 

         10.40   Thermo Electron Corporation Nonqualified Stock
                 Option Plan (filed as Exhibit 4(e) to Thermo
                 Electron's Registration Statement on Form S-8
                 [Reg. No. 33-8993] and incorporated herein by
                 reference).  (Plan amended in 1984 to extend
                 expiration date to December 14, 1994; maximum
                 number of shares issuable is 9,035,156 shares,
                 after adjustment to reflect share increases
                 approved in 1984 and 1986, share decrease
                 approved in 1989, and 3-for-2 stock splits
                 effected in October 1986, October 1993 and May
                 1995). 











                                       32
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.41   Thermo Electron Corporation Equity Incentive Plan
                 (filed as Exhibit 10.1 to Thermo Electron's
                 Quarterly Report on Form 10-Q for the fiscal
                 quarter ended July 2, 1994 [File No. 1-8002] and
                 incorporated herein by reference).  (Plan amended
                 in 1989 to restrict exercise price for SEC
                 reporting persons to not less than 50% of fair
                 market value or par value; maximum number of
                 shares issuable is 7,050,000 shares, after
                 adjustment to reflect 3-for-2 stock splits
                 effected in October 1993 and May 1995 and share
                 increase approved in 1994). 

         10.42   Thermo Electron Corporation - Thermedics Inc.
                 Nonqualified Stock Option Plan (filed as Exhibit
                 4 to a Registration Statement on Form S-8 of
                 Thermedics Inc. [Reg. No. 2-93747] and
                 incorporated herein by reference).  (Maximum
                 number of shares issuable is 450,000 shares,
                 after adjustment to reflect share increase
                 approved in 1988, 5-for-4 stock split effected in
                 January 1985, 4-for-3 stock split effected in
                 September 1985, and 3-for-2 stock splits effected
                 in October 1986 and November 1993). 

         10.43   Thermo Electron Corporation - Thermo Instrument
                 Systems Inc. (formerly Thermo Environmental
                 Corporation) Nonqualified Stock Option Plan
                 (filed as Exhibit 4(c) to a Registration
                 Statement on Form S-8 of Thermo Instrument
                 Systems Inc. [Reg. No. 33-8034] and incorporated
                 herein by reference).  (Maximum number of shares
                 issuable is 421,875 shares, after adjustment to
                 reflect 3-for-2 stock splits effected in July
                 1993 and April 1995 and a 5-4 stock split
                 effected in December 1995). 

         10.44   Thermo Electron Corporation - Thermo Instrument
                 Systems Inc. Nonqualified Stock Option Plan
                 (filed as Exhibit 10.12 to Thermo Electron's
                 Annual Report on Form 10-K for the fiscal year
                 ended January 3, 1987 [File No. 1-8002] and
                 incorporated herein by reference).  (Maximum
                 number of shares issuable is 600,285 shares,
                 after giving effect to share increase approved in
                 1988 and adjustment for 3-for-2 stock splits
                 effected in January 1988 and July 1993 and a
                 5-for-4 stock split effected December 1995). 



                                       33
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.45   Thermo Electron Corporation - Thermo TerraTech
                 Inc. (formerly Thermo Process Systems Inc.)
                 Nonqualified Stock Option Plan (filed as Exhibit
                 10.13 to Thermo Electron's Annual Report on Form
                 10-K for the fiscal year ended January 3, 1987
                 [File No. 1-8002] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 108,000 shares, after adjustment to reflect
                 6-for-5 stock splits effected in July 1988 and
                 March 1989, and 3-for-2 stock split effected in
                 September 1989). 

         10.46   Thermo Electron Corporation - Thermo Power
                 Corporation (formerly Tecogen Inc.) Nonqualified
                 Stock Option Plan (filed as Exhibit 10.14 to
                 Thermo Electron's Annual Report on Form 10-K for
                 the fiscal year ended January 3, 1987 [File No.
                 1-8002] and incorporated herein by reference).
                 (Amended in September 1995 to extend the plan
                 expiration date to December 31, 2005). 

         10.47   Thermo Electron Corporation - Thermo
                 Cardiosystems Inc. Nonqualified Stock Option Plan
                 (filed as Exhibit 10.11 to Thermo Electron's
                 Annual Report on Form 10-K for the fiscal year
                 ended December 29, 1990 [File No. 1-8002] and
                 incorporated herein by reference).  (Maximum
                 number of shares issuable is 130,500 shares,
                 after adjustment to reflect share increases
                 approved in 1990 and 1992, 3-for-2 stock split
                 effected in January 1990, 5-for-4 stock split
                 effected in May 1990 and 2-for-1 stock split
                 effected in November 1993). 

         10.48   Thermo Electron Corporation - Thermo Ecotek
                 Corporation (formerly Thermo Energy Systems
                 Corporation) Nonqualified Stock Option Plan
                 (filed as Exhibit 10.12 to Thermo Electron's
                 Annual Report on Form 10-K for the fiscal year
                 ended December 29, 1990 [File No. 1-8002] and
                 incorporated herein by reference). 










                                       34
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.49   Thermo Electron Corporation - ThermoTrex
                 Corporation (formerly Thermo Electron
                 Technologies Corporation) Nonqualified Stock
                 Option Plan (filed as Exhibit 10.13 to Thermo
                 Electron's Annual Report on Form 10-K for the
                 fiscal year ended December 29, 1990 [File No.
                 1-8002] and incorporated herein by reference).
                 (Maximum number of shares issuable is 180,000
                 shares, after adjustment to reflect 3-for-2 stock
                 split effected in October 1993). 

         10.50   Thermo Electron Corporation - Thermo Fibertek
                 Inc. Nonqualified Stock Option Plan (filed as
                 Exhibit 10.14 to Thermo Electron's Annual Report
                 on Form 10-K for the fiscal year ended December
                 28, 1991 [File No. 1-8002] and incorporated
                 herein by reference).  (Maximum number of shares
                 issuable is 600,000 shares, after adjustment to
                 reflect 2-for-1 stock split effected in September
                 1992 and 3-for-2 stock split effected in
                 September 1995). 

         10.51   Thermo Electron Corporation - Thermo Voltek Corp.
                 (formerly Universal Voltronics Corp.)
                 Nonqualified Stock Option Plan (filed as Exhibit
                 10.17 to Thermo Electron's Annual Report on Form
                 10-K for the fiscal year ended January 2, 1993
                 [File No. 1-8002] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 57,500 shares, after adjustment to reflect
                 3-for-2 stock split effected in November 1993 and
                 share increase approved in September 1995). 

         10.52   Thermo Ecotek Corporation (formerly, Thermo
                 Energy Systems Corporation) Incentive Stock
                 Option Plan (filed as Exhibit 10.18 to Thermo
                 Electron's Annual Report on Form 10-K for the
                 fiscal year ended January 2, 1993 [File No.
                 1-8002] and incorporated herein by reference).
                 (Maximum number of shares issuable is 900,000
                 shares, after adjustment to reflect share
                 increase approved in December 1993). 









                                       35
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.53   Thermo Ecotek Corporation (formerly, Thermo
                 Energy Systems Corporation) Nonqualified Stock
                 Option Plan (filed as Exhibit 10.19 to Thermo
                 Electron's Annual Report on Form 10-K for the
                 fiscal year ended January 2, 1993 [File No.
                 1-8002] and incorporated herein by reference).
                 (Maximum number of shares issuable is 900,000
                 shares, after giving effect to share increase
                 approved in December 1993). 

         10.54   Thermo Ecotek Corporation (formerly Thermo Energy
                 Systems Corporation) Equity Incentive Plan (filed
                 as Exhibit 10.39 to Thermo Instrument Systems
                 Inc.'s Annual Report on Form 10-K for the fiscal
                 year ended December 31, 1994 [File No. 1-9786]
                 and incorporated herein by reference). 

        10.55    Thermedics Inc. Nonqualified Stock Option Plan
                 (filed as Exhibit 10(e) to Thermedics'
                 Registration Statement on Form S-1 [Reg. No.
                 33-84380] and incorporated herein by reference).
                 (Maximum number of shares issuable is 1,931,923
                 shares, after adjustment to reflect share
                 increases approved in 1986 and 1992, 5-for-4
                 stock split effected in January 1985, 4-for-3
                 stock split effected in September 1985, and
                 3-for-2 stock split effected in October 1986 and
                 November 1993). 

         10.56   Thermedics Inc. Incentive Stock Option Plan
                 (filed as Exhibit 10(d) to Thermedics'
                 Registration Statement on Form S-1 [Reg. No.
                 33-84380] and incorporated herein by reference).
                 (Maximum number of shares issuable is 1,931,923
                 shares, after adjustment to reflect share
                 increases approved in 1986 and 1992, 5-for-4
                 stock split effected in January 1985, 4-for-3
                 stock split effected in September 1985, and
                 3-for-2 stock split effected in October 1986 and
                 November 1993). 

         10.57   Thermedics Inc. Equity Incentive Plan (filed as
                 Appendix A to the Proxy Statement dated May 10,
                 1993 of Thermedics Inc. [File No. 1-9567] and
                 incorporated herein by reference). (Maximum
                 number of shares issuable is 1,500,000, after
                 adjustment to reflect 3-for-2 stock split
                 effected in November 1993). 



                                       36
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.58   Thermedics Inc. - Thermedics Detection Inc.
                 Nonqualified Stock Option Plan (filed as Exhibit
                 10.20 to Thermo Electron's Annual Report on Form
                 10-K for the fiscal year ended January 2, 1993
                 [File No. 1-8002] and incorporated herein by
                 reference). 

         10.59   Thermo Cardiosystems Inc. Incentive Stock Option
                 Plan (filed as Exhibit 10(f) to Thermo
                 Cardiosystems' Registration Statement on Form S-1
                 [Reg. No. 33-25144] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 1,143,750 shares, after adjustment to reflect
                 share increase approved in 1992, 3-for-2 stock
                 split effected in January 1990, 5-for-4 stock
                 split effected in May 1990 and 2-for-1 stock
                 split effected in November 1993). 

         10.60   Thermo Cardiosystems Inc. Nonqualified Stock
                 Option Plan (filed as Exhibit 10(g) to Thermo
                 Cardiosystems' Registration Statement on Form S-1
                 [Reg. No. 33-25144] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 1,143,750 shares, after adjustment to reflect
                 share increase approved in 1992, 3-for-2 stock
                 split effected in January 1990, 5-for-4 stock
                 split effected in May 1990 and 2-for-1 stock
                 split effected in November 1993). 

         10.61   Thermo Cardiosystems Inc. Equity Incentive Plan
                 (filed as Exhibit 10.46 to Thermo Instrument
                 Systems Inc.'s Annual Report on Form 10-K for the
                 fiscal year ended December 31, 1994 [File No.
                 1-9786] and incorporated herein by reference). 

         10.62   Thermo Voltek Corp. (formerly Universal
                 Voltronics Corp.) 1985 Stock Option Plan (filed
                 as Exhibit 10.14 to Thermo Voltek's Annual Report
                 on Form 10-K for the fiscal year ended June 30,
                 1985 [File No. 0-8245] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 200,000 shares, after adjustment to reflect
                 1-for-3 reverse stock split effected in November
                 1992 and 3-for-2 stock split effected in
                 November 1993). 






                                       37
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.63   Thermo Voltek Corp. (formerly Universal
                 Voltronics Corp.) 1990 Stock Option Plan (filed
                 as Exhibit 10.2 to Thermo Voltek's Annual Report
                 on Form 10-K for the fiscal year ended June 30,
                 1990 [File No. 1-10574] and incorporated herein
                 by reference).  (Maximum number of shares
                 issuable is 400,000 shares, after adjustment to
                 reflect share increase in 1993, 1-for-3 reverse
                 stock split effected in November 1992 and 3-for-2
                 stock split effected in November 1993). 

         10.64   Thermo Voltek Corp. Equity Incentive Plan (filed
                 as Exhibit 10.49 to Thermo Instrument Systems
                 Inc.'s Annual Report on Form 10-K for the fiscal
                 year ended December 31, 1994 [File 1-9786] and
                 incorporated herein by reference). 

         10.65   Thermo Instrument Systems Inc. Incentive Stock
                 Option Plan (filed as Exhibit 10(c) to Thermo
                 Instrument Systems Inc.'s Registration Statement
                 on Form S-1 [Reg. No. 33-6762] and incorporated
                 herein by reference).  (Maximum number of shares
                 issuable is 2,812,500 shares, after adjustment to
                 reflect share increase approved in 1990, 3-for-2
                 stock splits effected in January 1988, July 1993
                 and April 1995 and 5-for-4 stock split effected
                 in December 1995). 

         10.66   Thermo Instrument Systems Inc. Nonqualified Stock
                 Option Plan (filed as Exhibit 10(d) to Thermo
                 Instrument Systems Inc.'s Registration Statement
                 on Form S-1 [Reg. No. 33-6762] and incorporated
                 herein by reference).  (Maximum number of shares
                 issuable is 2,812,500 shares, after adjustment to
                 reflect share increase approved in 1990, 3-for-2
                 stock splits effected in January 1988, July 1993
                 and April 1995 and a 5-for-4 stock split effected
                 in December 1995). 

        10.67    Thermo Instrument Systems Inc. Equity Incentive
                 Plan (filed as Appendix A to the Proxy Statement
                 dated April 27, 1993 of Thermo Instrument Systems
                 Inc. [File No. 1-9786] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 4,031,250 shares, after adjustment to reflect
                 share increase approved in December 1993, 3-for-2
                 stock splits effected in July 1993 and April 1995
                 and a 5-for-4 stock split effected in December
                 1995).  


                                       38
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.68   Thermo Instrument Systems Inc. (formerly Thermo
                 Environmental Corporation) Incentive Stock Option
                 Plan (filed as Exhibit 10(d) to Thermo
                 Environmental's Registration Statement on Form
                 S-1 [Reg. No. 33-329] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 1,160,156 shares, after giving effect to share
                 increase approved in 1987 and adjustment to
                 reflect 3-for-2 stock splits effected in
                 July 1993 and April 1995 and a 5-for-4 stock
                 split effected in December 1995). 

         10.69   Thermo Instrument Systems Inc. (formerly Thermo
                 Environmental Corporation) Nonqualified  Stock
                 Option Plan (filed as Exhibit 10(e) to Thermo
                 Environmental's Registration Statement on Form
                 S-1 [Reg. No. 33-329] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 1,160,156 shares, after giving effect to share
                 increase approved in 1987 and adjustment to
                 reflect 3-for-2 stock splits effected in
                 July 1993 and April 1995 and a 5-for-4 stock
                 split effected in December 1995). 

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

         10.71   ThermoSpectra Corporation Equity Incentive Plan
                 (filed as Exhibit 10.52 to Thermo Instrument
                 Systems Inc.'s Annual Report on Form 10-K for the
                 fiscal year ended December 31, 1994 [File No.
                 1-9786] and incorporated herein by reference). 

         10.72   ThermoTrex Corporation (formerly Thermo Electron
                 Technologies Corporation) Incentive Stock Option
                 Plan (filed as Exhibit 10(h) to ThermoTrex's
                 Registration Statement on  Form S-1 [Reg. No.
                 33-40972] and incorporated herein by reference).
                 (Maximum number of shares issuable is 1,945,000
                 shares, after giving effect to share increases
                 approved in 1992 and 1993, and 3-for-2 stock
                 split effected in October 1993).  





                                       39
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.73   ThermoTrex Corporation (formerly Thermo Electron
                 Technologies Corporation) Nonqualified Stock
                 Option Plan (filed as Exhibit 10(i) to
                 ThermoTrex's Registration Statement on Form S-1
                 [Reg. No. 33-40972] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 1,945,000 shares, after giving effect to share
                 increases approved in 1992 and 1993, and 3-for-2
                 stock split effected in October 1993). 

         10.74   ThermoTrex Corporation - ThermoLase Corporation
                 (formerly ThermoLase Inc.) Nonqualified Stock
                 Option Plan (filed as Exhibit 10.53 to Thermedics
                 Inc.'s Annual Report on Form 10-K for the fiscal
                 year ended January 1, 1994 [File No. 1-9567] and
                 incorporated herein by reference). 

         10.75   ThermoLase Corporation (formerly ThermoLase Inc.)
                 Nonqualified Stock Option Plan (filed as Exhibit
                 10.54 to Thermedics Inc.'s Annual Report on Form
                 10-K for the fiscal year ended January 1, 1994
                 [File No. 1-9567] and incorporated herein by
                 reference). (Maximum number of shares issuable in
                 the aggregate under this plan and the ThermoLase
                 Incentive Stock Option Plan is 2,800,000 shares,
                 after adjustment to reflect increase approved in
                 1993 and 2-for-1 stock splits effected in March
                 1994 and June 1995). 

         10.76   ThermoLase Corporation (formerly ThermoLase Inc.)
                 Incentive Stock Option Plan (filed as Exhibit
                 10.55 to Thermedics Inc.'s Annual Report on Form
                 10-K for the fiscal year ended January 1, 1994
                 [File No. 1-9567] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 in the aggregate under this plan and the
                 ThermoLase Nonqualified Stock Option Plan is
                 2,800,000 shares, after adjustment to reflect
                 share increase approved in 1993 and 2-for-1 stock
                 splits effected in March 1994 and June 1995). 

         10.77   ThermoLase Corporation Equity Incentive Plan
                 (filed as Exhibit 10.81 to the Registrant's
                 Annual Report on Form 10-K for the fiscal year
                 ended April 1, 1995 [File No. 1-9549] and
                 incorporated herein by reference). 





                                       40
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.78   Thermo Fibertek Inc. Incentive Stock Option Plan
                 (filed as Exhibit 10(k) to Thermo Fibertek's
                 Registration Statement on Form S-1 [Reg. No.
                 33-51172] and incorporated herein by reference). 

         10.79   Thermo Fibertek Inc. Nonqualified Stock Option
                 Plan (filed as Exhibit 10(l) to Thermo Fibertek's
                 Registration Statement on Form S-1 [Reg. No.
                 33-51172] and incorporated herein by reference). 

        10.80    Thermo Fibertek Inc. Equity Incentive Plan (filed
                 as Exhibit 10.60 to Thermo Instrument Systems
                 Inc.'s Annual Report on Form 10-K for the fiscal
                 year ended December 31, 1994 [File No. 1-9786]
                 and incorporated herein by reference). 

         10.81   Thermo Power Corporation (formerly Tecogen Inc.)
                 Incentive Stock Option Plan (filed as Exhibit
                 10(h) to Thermo Power's Quarterly Report on Form
                 10-Q for the quarter ended April 3, 1993 [File
                 No. 1-10573] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 950,000 shares, after adjustment to reflect
                 share increases approved in 1990, 1992 and 1993).


         10.82   Thermo Power Corporation (formerly Tecogen Inc.)
                 Nonqualified Stock Option Plan (filed as Exhibit
                 10(i) to Thermo Power's Quarterly Report on Form
                 10-Q for the quarter ended April 3, 1993 [File
                 No. 1-10573] and incorporated herein by
                 reference).  (Maximum number of shares issuable
                 is 950,000 shares, after giving effect to share
                 increases approved in 1990, 1992 and 1993). 

         10.83   Thermo Power Corporation Equity Incentive Plan  
                 (filed as Exhibit 10.63 to Thermo Instrument
                 Systems Inc.'s Annual Report on Form 10-K for the
                 fiscal year ended December 31, 1994 [File No.
                 1-9786] and incorporated herein by reference). 

         10.84   Thermo Remediation Inc. Equity Incentive Plan
                 (filed as Exhibit 10.7 to Thermo Remediation's
                 Registration Statement on Form S-1 [Reg. No.
                 33-70544] and incorporated herein by reference).
                 (Maximum number of shares issuable is 1,125,000
                 shares, after adjustment to reflect a 3-for-2
                 stock split effected in March 1995). 



                                       41
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.85   Thermedics Detection Inc. Equity Incentive Plan
                 (filed as Exhibit 10.69 to Thermo Instrument
                 Systems Inc.'s Annual Report on Form 10-K for the
                 fiscal year ended December 31, 1994 [File No.
                 1-9786] and incorporated herein by reference). 

         10.86   Thermo Electron Corporation - Thermo BioAnalysis
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.31 to Thermo Power's Annual Report
                 on Form 10-K for the fiscal year ended September
                 30, 1995 [File No. 1-10573] and incorporated
                 herein by reference). 

         10.87   Thermo Electron Corporation - ThermoLyte
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.32 to Thermo Power's Annual Report
                 on Form 10-K for the fiscal year ended September
                 30, 1995 [File No. 1-10573] and incorporated
                 herein by reference). 

         10.88   Thermo Electron Corporation - Thermo Remediation
                 Inc. Nonqualified Stock Option Plan (filed as
                 Exhibit 10.33 to Thermo Power's Annual Report on
                 Form 10-K for the fiscal year ended September 30,
                 1995 [File No. 1-10573] and incorporated herein
                 by reference). 

         10.89   Thermo Electron Corporation - ThermoSpectra
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.34 to Thermo Power's Annual Report
                 on Form 10-K for the fiscal year ended September
                 30, 1995 [File No. 1-10573] and incorporated
                 herein by reference). 

         10.90   Thermo Electron Corporation - ThermoLase
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.35 to Thermo Power's Annual Report
                 on Form 10-K for the fiscal year ended September
                 30, 1995 [File No. 1-10573] and incorporated
                 herein by reference). 

         10.91   Thermo Electron Corporation - ThermoQuest
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.41 to Thermo Cardiosystems' Annual
                 Report on Form 10-K for the fiscal year ended
                 December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 




                                       42
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.92   Thermo Electron Corporation - Thermo Optek
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.42 to Thermo Cardiosystems' Annual
                 Report on Form 10-K for the fiscal year ended
                 December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 

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

         10.94   Thermo Electron Corporation - Trex Medical
                 Corporation Nonqualified Stock Option Plan (filed
                 as Exhibit 10.44 to Thermo Cardiosystems' Annual
                 Report on Form 10-K for the fiscal year ended
                 December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 

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

         10.96   Thermo Sentron Inc. Equity Incentive Plan (filed
                 as Exhibit 10.57 to Thermo Cardiosystems' Annual
                 Report on Form 10-K for the fiscal year ended
                 December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 

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

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




                                       43
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----

         10.99   Thermo BioAnalysis Corporation Equity Incentive
                 Plan (filed as Exhibit 10.67 to Thermo
                 Cardiosystems' Annual Report on Form 10-K for the
                 fiscal year ended December 30, 1995 [File No.
                 1-10114] and incorporated herein by reference). 

         10.100  Thermo Optek Corporation Equity Incentive Plan
                 (filed as Exhibit 10.68 to Thermo Cardiosystems'
                 Annual Report on Form 10-K for the fiscal year
                 ended December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 

         10.101  ThermoQuest Corporation Equity Incentive Plan
                 (filed as Exhibit 10.68 to Thermo Cardiosystems'
                 Annual Report on Form 10-K for the fiscal year
                 ended December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 

         10.102  ThermoTrex Corporation - Trex Medical Corporation
                 Nonqualified Stock Option Plan (filed as Exhibit
                 10.73 to Thermo Cardiosystems' Annual Report on
                 Form 10-K for the fiscal year ended December 30,
                 1995 [File No. 1-10114] and incorporated herein
                 by reference). 

         10.103  Trex Medical Corporation Equity Incentive Plan
                 (filed as Exhibit 10.77 to Thermo Cardiosystems'
                 Annual Report on Form 10-K for the fiscal year
                 ended December 30, 1995 [File No. 1-10114] and
                 incorporated herein by reference). 

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

         10.105  ThermoLyte Corporation Equity Incentive Plan
                 (filed as Exhibit 10.71 to Thermo Power's Annual
                 Report on Form 10-K for the fiscal year ended
                 September 30, 1995 [File No. 1-10573] and
                 incorporated herein by reference). 

         13.1    The Registrant's Quarterly Report on Form 10-Q
                 for the fiscal quarter ended December 30, 1995
                 [File No. 1-9549] (incorporated herein by
                 reference).  

         23.1    Consent of Arthur Andersen LLP

                                       44
PAGE
<PAGE>





        Exhibit
        Number   Reference                                         Page
        ------   ---------                                         ----


         23.2    Consent of Trout, Ebersole & Groff 

         23.3    Consent of KPMG Peat Marwick LLP 

         23.4    Consent of Nardella & Taylor 

         23.5    Consent of Ernst & Young LLP 

         23.6    Consent of Seth H. Hoogasian, Esq. (contained in
                 Exhibit 5.1) 

         24.1    Power of Attorney (see signature page)

          99     The Registrant's Restated Certificate of
                 Incorporation, as amended. 



































                                       45











             The securities represented hereby have not been registered
        under the Securities Act of 1933, as amended, or registered or
        qualified under any state securities laws, and such securities
        may not be sold, transferred or otherwise disposed of in the
        absence of an effective registration statement under such Act and
        registration and qualification under all applicable state
        securities laws or pursuant to exemptions therefrom.


                           Thermo Process Systems Inc.
                               12068 Market Street
                             Livonia, Michigan 48150

                             STOCK PURCHASE WARRANT


        Date of Issuance:                            Right to Purchase   
                                                     Shares of Common 
                                                     Stock (subject to 
                                                     adjustment)

        Warrant #                           


             For value received, Thermo Process Systems Inc., a Delaware
        corporation (the "Company"), hereby grants to _________________,
        or its registered assigns (the "Registered Holder"), the right to
        purchase from the Company _____ shares of the Company's Common
        Stock (subject to adjustment pursuant to Section 4 hereof) at a
        price of $_____ per share (as adjusted pursuant to Section 3
        hereof, the "Exercise Price").  This Warrant is one of the
        warrants identical in form issued by the Company pursuant to the
        Securities Purchase Agreements dated December ___, 1992
        (collectively, the "Purchase Agreement"), between the Company and
        certain investors named therein.  The amount and kind of
        securities purchasable pursuant to the rights granted under this
        Warrant and the purchase price for such securities are subject to
        adjustment pursuant to the provisions contained in this Warrant.

             This Warrant is subject to the following provisions:

             1.   Definitions.  As used in this Warrant, the following
        terms have the meanings set forth below:

                  "Common Stock" means the Company's Common Stock, $.10
        par value per share.

                  "Date of Issuance" shall have the meaning specified in
        Section 10 of this Warrant.
PAGE
<PAGE>





                  "Market Price" is defined as the average of the daily
        closing prices for the 20 consecutive trading days, immediately
        preceding the date of computation.  The closing price for each
        day shall be (i) if the shares of Common Stock are listed or
        admitted to trading on a principal national securities exchange
        or the National Market System of NASDAQ, the last reported sales
        price on the principal national securities exchange on which the
        shares of Common Stock are listed or admitted to trading or on
        the National Market System of NASDAQ or (ii) if the shares of
        Common Stock are not listed or admitted to trading on any such
        exchange, the average of the highest bid and lower asked prices,
        as reported on the Automated Quotation System of the National
        Quotations Bureau, Incorporated or an equivalent, generally
        accepted reporting service.  If at any time such security is not
        listed on any domestic securities exchange or quoted in the
        NASDAQ System or the domestic over-the-counter market, the
        "Market Price" will be the fair value thereof determined by the
        Board of Directors in good faith.

                  "NASDAQ System" means the NASDAQ Inter-Dealer Quotation
        System or such other similar inter-dealer quotation system as may
        in the future be used generally by members of the National
        Association of Securities Dealers, Inc., for the over-the-counter
        transactions in securities.

                  "Person" means an individual, a partnership, a
        corporation, a trust, a joint venture, an unincorporated
        organization and a government or any department or agency
        thereof.

                  "Warrants" means this Warrant and all other stock
        purchase warrants issued pursuant to the Purchase Agreement, and
        all stock purchase warrants issued in exchange therefor pursuant
        to the terms thereof.

                  "Warrant Stock" means shares of the Company's
        authorized but unissued Common Stock; provided that if there is a
        change such that the securities issuable upon exercise of the
        Warrant are issued by an entity other than the Company or there
        is a change in the class of securities so issuable, then the term
        "Warrant Stock" will mean one share of the security issuable upon
        exercise of the Warrant if such security is issuable in shares,
        or will mean the smallest unit in which such security is issuable
        if such security is not issuable in shares.

             2.   Exercise of Warrant.

                  2.1  Exercise Period.  The Registered Holder may
        exercise this Warrant, in whole or in part (but not as to a
        fractional share of Warrant Stock), at any time and from time to
        time after the date the Warrant and Warrant Stock is registered
        under the Securities Act of 1933 and prior to the fifth
        anniversary of the date such registration (the "Exercise
        Period").
PAGE
<PAGE>






                  2.2  Exercise Procedure.

                       (a)  This Warrant will be deemed to have been
        exercised at such time as the Company has received all of the
        following items (the "Exercise Date"):

                            (i)  a completed Exercise Agreement, as
                       described below, executed by the Person exercising
                       all or part of the purchase right represented by
                       this Warrant (the "Purchaser");

                            (ii)  this Warrant;

                            (iii)  if this Warrant is not registered in
                       the name of the Purchaser, an Assignment or
                       Assignments in the form set forth in Exhibit II
                       hereto, evidencing the assignment of this Warrant
                       to the Purchaser; and

                            (iv)  a check payable to the Company in an
                       amount equal to the product of the Exercise Price
                       multiplied by the number of shares of Warrant
                       Stock being purchased upon such exercise.

                       (b)  Certificates for shares of Warrant Stock
        purchased upon exercise of this Warrant will be delivered by the
        Company to the Purchaser within ten days after the Exercise Date.
        Unless this Warrant has expired or all of the purchase rights
        represented hereby have been exercised, the Company will prepare
        a new Warrant, substantially identical hereto, representing the
        rights formerly represented by this Warrant which have not
        expired or been exercised.  The Company will, within such ten-day
        period, deliver such new Warrant to the Person designated for
        delivery in the Exercise Agreement.

                       (c)  The Warrant Stock issuable upon the exercise
        of this Warrant will be deemed to have been issued to the
        Purchaser on the Exercise Date, and the Purchaser will be deemed
        for all purposes to have been the record holder of such Warrant
        Stock on the Exercise Date.

                       (d)  The issuance of certificates for shares of
        Warrant Stock upon exercise of this Warrant will be made without
        charge to the Registered Holder or the Purchaser for any issuance
        tax in respect thereof or any other cost incurred by the Company
        in connection with such exercise and the related issuance of
        shares of Warrant Stock.  The Company shall not, however, be
        required to pay any tax which may be payable in respect of any
        transfer, in whole or in part, of this Warrant (including the
        issuance of new Warrants in connection therewith or the delivery
        of stock certificates in a name other than that of the Registered
        Holder of this Warrant presented for exercise, and any such tax
PAGE
<PAGE>





        shall be paid by such Registered Holder at the time of
        presentation.

                       (e)  The Company will not close its books for the
        transfer of this Warrant or of any share of Warrant Stock issued
        or issuable upon the exercise on this Warrant in any manner which
        interferes with the timely exercise of this Warrant.

                  2.3  Exercise Agreement.  The Exercise Agreement will
        be substantially in the form set forth in Exhibit I hereto,
        except that if the shares of Warrant Stock are not to be issued
        in the name of the Registered Holder of this Warrant, the
        Exercise Agreement will also state the name of the Person to whom
        the certificates for the shares of Warrant Stock are to be
        issued, and if the number of shares of Warrant Stock to be issued
        does not include all the shares of Warrant Stock purchasable
        hereunder, it will also state the name of the Person to whom a
        new Warrant for the unexercised portion of the rights hereunder
        is to be delivered.

                  2.4  Fractional Shares.  If a fractional share of
        Warrant Stock would, but for the provisions of Subsection 2.1, be
        issuable upon exercise of the rights represented by this Warrant,
        the Company will, within ten days after the Exercise Date,
        delivery to the Purchaser a check payable to the Purchaser in
        lieu of such fractional share, in an amount equal to the Market
        Price of such fractional share as of the close of business on the
        Exercise Date.

             3.   Exercise Price.

                  3.1  General.  The initial Exercise Price will be
        $11.34.  In order to prevent dilution of the rights granted under
        this Warrant, the Exercise Price will be subject to adjustment
        from time to time pursuant to this Section 3.

                  3.2  Subdivision or Combination of Common Stock and
        Stock Dividends.  In case the Company shall at any time after the
        date hereof (a) issue any shares of Common Stock as a dividend
        upon Common Stock, or (b) issue any shares of Common 
        Stock by reclassification or otherwise, or (c) combine
        outstanding shares of Common Stock, by reclassification or
        otherwise, the Exercise Price which would apply if purchase
        rights hereunder were being exercised immediately prior to such
        action by the Company shall be adjusted by multiplying it by a
        fraction, the numerator of which shall be the number of shares of
        Common Stock outstanding immediately prior to such dividend,
        subdivision or combination and the denominator of which shall be
        the number of shares of Common Stock outstanding immediately
        after such dividend, subdivision or combination.

                  3.3  Certain Dividends.  In case the Company shall
        declare a dividend upon the Common Stock payable otherwise than
        out of earnings or retained earnings and otherwise than in Common
PAGE
<PAGE>





        Stock, the Exercise Price shall be adjusted by multiplying the
        Exercise Price in effect immediately prior to the declaration of
        such dividend by a fraction, the numerator of which shall be the
        current Market Price per share of Common Stock, on such date,
        less the fair market value, as determined by the Board of
        Directors of the Company, whose determination shall be
        conclusive, of the portion of the assets or evidences of
        indebtedness so to be distributed or of such subscription rights,
        options or warrants applicable to one share of Common Stock, and
        of which the denominator shall be such current Market Price per
        share of Common Stock.  For the purposes of the foregoing, a
        dividend other than in cash shall be considered payable out of
        earnings or retained earnings only to the extent that such
        earnings or retained earnings are charged an amount equal to the
        value of such dividend as determined by the Board of Directors of
        the Company.  Such reductions shall take effect as of the date on
        which a record is taken for the purpose of such dividend, or, if
        a record is not taken, the date as of which the holders of Common
        Stock or record entitled to such dividend are to be determined.

                  3.4  No Adjustments.  No adjustment of the Exercise
        Price shall be made if the amount of such adjustment shall be
        less than one cent per share, but in such case any adjustment
        that would otherwise be required then to be made shall be carried
        forward and shall be made at the time and together with the next
        subsequent adjustment which, together with any adjustment or
        adjustments so carried forward, shall amount to not less than one
        cent per share.

             4.   Adjustment of Number of Shares Issuable upon Exercise.
        In the event of a stock dividend, stock split, combination or
        other event described in Sections 3.2 and 3.3 hereof, the
        Registered Holder of this Warrant shall thereafter (until another
        such adjustment) be entitled to purchase the number of shares of
        Warrant Stock, calculated to the nearest full share, determined
        by (a) multiplying the number of shares of Warrant Stock
        purchasable hereunder immediately prior to the adjustment of the
        Exercise Price by the Exercise Price in effect immediately prior
        to such adjustment, and (b) dividing the product so obtained by
        the adjusted Exercise Price in effect immediately after such
        adjustment.

             5.   Effect of Reorganization, Reclassification,
        Consolidation, Merger or Sale.  If at any time while this Warrant
        is outstanding there shall be any reorganization or
        reclassification of the capital stock of the Company (other than
        a subdivision or combination of shares provided for in Subsection
        3.3 hereof) or any consolidation or merger of the Company with
        another corporation (other than a consolidation or merger in
        which the Company is the surviving entity  and which does not
        result in any change in the Common Stock), or any sale or other
        disposition by the Company of all or substantially all of its
        assets to any other corporation, the holder of this Warrant shall
        thereafter upon exercise of this Warrant be entitled to receive
PAGE
<PAGE>





        the number of shares of stock or other securities or property of
        the Company, or of the successor corporation resulting from such
        consolidation or merger, as the case may be, to which the Warrant
        Common Stock (and any other securities and property) of the
        Company, deliverable upon the exercise of this Warrant, would
        have been entitled upon such reorganization, reclassification of
        capital stock, consolidation, merger, sale or other disposition
        if this Warrant had been exercised immediately prior to such
        reorganization, reclassification of capital stock, consolidation,
        merger, sale or other disposition.  In any such case, appropriate
        adjustment (as determined by the Board of Directors of the
        Company) shall be made in the application of the provisions set
        forth in this Warrant with respect to the rights and interests
        thereafter of the holder of this Warrant to the end that the
        provisions set forth in this Warrant (including those relating to
        adjustments of the Exercise Price and the number of shares
        issuable upon the exercise of this Warrant) shall thereafter be
        applicable, as near as reasonably may be, in relation to any
        shares or other property thereafter deliverable upon the exercise
        hereof as if this Warrant had been exercised immediately prior to
        such reorganization, reclassification of capital stock,
        consolidation, merger, sale or other disposition and the holder
        hereof had carried out the terms of the exchange as provided for
        by such reorganization, reclassification of capital stock,
        consolidation or merger.  Notwithstanding any other provisions of
        this Warrant, in the event of sale or other disposition of all or
        substantially all of the assets of the Company as a part of a
        plan for liquidation of the Company, all rights to exercise the
        Warrant shall terminate 30 days after the Company gives written
        notice to the Registered Holder of this Warrant that such sale or
        other disposition has been consummated.

             6.   Notice of Adjustments.  Immediately upon any adjustment
        of the Exercise Price or increase or decrease in the number of
        shares of Common Stock purchasable upon exercise of this Warrant,
        the Company will send written notice thereof to all Registered
        Holders, stating the adjusted Exercise Price and the increased or
        decreased number of shares purchasable upon exercise of this
        Warrant and setting forth in reasonable detail the method of
        calculation for such adjustment and increase or decrease.

             7.   Reservation of Common Stock.  The Company will at all
        times reserve and keep available for issuance upon the exercise
        of Warrants such number of its authorized but unissued shares of
        Common Stock as will be sufficient to permit the exercise in full
        of all outstanding Warrants, and upon such issuance such shares
        of Common Stock will be validly issued, fully paid and
        nonassessable.

             8.   No Voting Rights; Limitations of Liability.  This
        Warrant will not entitle the holder hereof to any voting rights
        or other rights as a stockholder of the Company.  No provision of
        this Warrant, in the absence of affirmative action by the
        Registered Holder to purchase Warrant Stock, and no enumeration
PAGE
<PAGE>





        in this Warrant of the rights or privileges of the Registered
        Holder, will give rise to any liability of such Holder for the
        Exercise Price of Warrant Stock acquirable by exercise hereof or
        as a stockholder of the Company.

             9.   Warrant Transferable.

                  (a)  Subject to the transfer conditions referred to in
        paragraph (b), below, this Warrant and all rights hereunder are
        transferable, in whole or in part, without charge to the
        Registered Holder, upon surrender of this Warrant with a properly
        executed Assignment (in the form of Exhibit II hereto) at the
        principal office of the Company.

                  (b)  Each Registered Holder of this Warrant
        acknowledges that this Warrant has not been registered under the
        Securities Act of 1933, as amended (the "Act"), and agrees not to
        sell, pledge, distribute, offer for sale, transfer or otherwise
        dispose of this Warrant or any Warrant Stock issued upon its
        exercise in the absence of (i) an effective registration
        statement as to this Warrant or such Warrant Stock under the Act
        (or any similar statute then in effect), or (ii) an opinion of
        counsel for the Company to the effect that such registration is
        not, under the circumstances, required.

             10.  Warrant Exchangeable for Different Denominations. This
        Warrant is exchangeable, upon the surrender hereof by the
        Registered Holder at the principal office of the Company, for new
        Warrants of like tenor representing in the aggregate the purchase
        rights hereunder, and each of such new Warrants will represent
        such portion of such rights as is designated by the Registered
        Holder at the time of such surrender.  The date the Company
        initially issues this Warrant will be deemed to be the "Date of
        Issuance" of this Warrant regardless of the number of times new
        certificates representing the unexpired and unexercised rights
        formerly represented by this Warrant are issued.

             11.  Miscellaneous.

                  11.1 Amendment and Waiver.  The provisions of the
        Warrants may be amended and the Company may take any action
        herein prohibited, or omit to perform any act herein required to
        be performed by it, only if the Company has obtained the written
        consent of the Registered Holders of Warrants representing at
        least 50% of the shares of Warrant Stock obtainable upon the
        exercise of the Warrants outstanding at the time of such consent.

                  11.2 Notices.  Any notices required to be sent to a
        Registered Holder will be delivered to the address of such
        Registered Holder shown on the books of the Company.  All notices
        referred to herein will be delivered in person or sent by first
        class mail, postage prepaid, and will be deemed to have been
        given when so delivered or sent.
PAGE
<PAGE>





                  11.3 Descriptive Headings; Governing Law.  The
        descriptive headings of the paragraphs of this Warrant are
        inserted for convenience only and do not constitute a part of
        this Warrant.  The construction, validity and interpretation of
        this Warrant will be governed by the laws of the Commonwealth of
        Massachusetts.

             IN WITNESS WHEREOF, the Company has cause this Warrant to be
        signed and attested by its duly authorized officers under its
        corporate seal.


                                 THERMO PROCESS SYSTEMS INC.

                                 By:_______________________
        [Corporate Seal]

        Attest:

        _____________________________
        Secretary
PAGE
<PAGE>








                                                     EXHIBIT I

                               EXERCISE AGREEMENT



        To:  Thermo Process Systems Inc.             Date:         



             The undersigned, pursuant to the provisions set forth in the
        within Warrant, hereby agrees to subscribe for and purchase _____
        shares of the Warrant Stock covered by such Warrant and makes
        payment herewith in full for such Warrant Stock at the price per
        share provided by such Warrant.

                                 Name ________________________           
                                      
                                 Signature____________________           
                                                        
                                 Address______________________           
                      
                                                                  


             This Exercise Agreement must be completed and sent with the
        items specified in Section 2.2 of the Warrant Agreement to:

                             Thermo Process Systems
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                          Waltham, Massachusetts 02254
                       Attn:  Sandra L. Lambert, Secretary
PAGE
<PAGE>










                                                     EXHIBIT II

                                   ASSIGNMENT



             FOR VALUE RECEIVED, ___________________ hereby sells,
        assigns and transfers all of the rights of the undersigned under
        the within Warrant with respect to the number of shares of the
        Warrant Stock covered thereby set forth below, unto:

             Names of Assignees       Address        No. of Shares
             ------------------       -------        -------------







        Date:                         Signature _________________________

                                      Witness____________________________
                               


             This Assignment must be completed and sent to:


                             Thermo Process Systems
                         c/o Thermo Electron Corporation
                                81 Wyman Street 
                          Waltham, Massachusetts 02254
                       Attn:  Sandra L. Lambert, Secretary








                                                              EXHIBIT 4.4


                               PURCHASE AGREEMENT

             THIS AGREEMENT is made as of the ____ day of March, 1993,
        among THERMO PROCESS SYSTEMS INC. ("TPS"), a Delaware
        corporation, TPST Soil Recyclers of Florida Inc., a Delaware
        corporation (the "Company") (TPS and the Company are sometimes
        hereinafter collectively referred to as the "Sellers"), and the
        purchaser whose name and address is set forth on the signature
        page hereof (the "Purchaser").

             IN CONSIDERATION of the mutual covenants contained in this
        Agreement, the Sellers, TPST and the Purchaser agree as follows:

             SECTION 1.  Authorization of Sale of the Units.  Subject to
        the terms and conditions of this Agreement, the Sellers have
        authorized the sale of 50 Units (the "Units"), each consisting of
        1,000 shares of Common Stock, $.01 par value per share (the
        "Shares"), of the Company and Common Stock Purchase Warrants (the
        "Warrants") for the purchase of 2,000 shares of common stock,
        $.10 par value, of TPS.  The Shares and the Warrants are
        hereinafter collectively referred to as the "Securities".

             SECTION 2.  Agreement to Sell and Purchase the Units.  At
        the Closing (as defined in Section 3), the Sellers will sell to
        the Purchaser, and the Purchaser will buy from the Sellers, upon
        the terms and conditions hereinafter set forth, the number of
        Units (at the purchase price) shown below:

             Number of Units         Price Per 
             To Be Purchased       Unit in Dollars    Aggregate Price
             ---------------       ---------------    ---------------

                                         
                                       $23,000



             The Sellers represent and warrant that the Sellers are
        proposing to enter into this same form of purchase agreement with
        certain other investors (the "Other Purchasers") and expect to
        complete sales of the Units to them.  The Purchaser and the Other
        Purchasers are hereinafter sometimes collectively referred to as
        the "Purchasers," and this Agreement and the agreements executed
        by the Other Purchasers are hereinafter sometimes collectively
        referred to as the "Agreements."

             SECTION 3.  Delivery of the Units at the Closing.  The
        completion of the purchase and sale of the Units (the "Closing")
        shall occur at a place and time (the "Closing Date") specified by
        the Sellers and of which the Purchasers will be notified by
        telex, cable or otherwise.  At the Closing, the Sellers shall
        deliver to the Purchaser one or more stock certificates and one

                                       -1-
PAGE
<PAGE>





        or more warrant certificates registered in the name of the
        Purchaser, or in such name(s) as designated by the Purchaser,
        representing the number of shares of Shares and Warrants
        contained in the number of Units set forth in Section 2 above.
        The name(s) in which the stock certificate(s) and warrant
        certificate(s) are to be registered are set forth in the Stock
        Certificate Questionnaire attached hereto as part of Appendix I.
        The Sellers' obligation to deliver such stock certificate(s) and
        warrant certificate(s) to the Purchaser at the Closing shall be
        subject to the following conditions, any one or more of which may
        be waived by the Sellers:  (a) receipt by the Sellers of a
        certified or official bank check or checks in New York Clearing
        House funds in the full amount of the purchase price of the Units
        being purchased hereunder; (b) completion of the purchases and
        sales under the Agreements with Other Purchasers; and (c) the
        accuracy of the representations and warranties made by the
        Purchasers and the fulfillment of those undertakings of the
        Purchasers to be fulfilled prior to the Closing.  The Purchaser's
        obligation to accept delivery of such stock certificate(s) and
        warrant certificate(s) and to pay for the Units evidenced thereby
        shall be subject to the accuracy of the representations and
        warranties made by the Sellers herein and the fulfillment of
        those undertakings of the Sellers to be fulfilled prior to
        Closing.

             SECTION 4.  Representations, Warranties and Covenants of the
        Sellers.  The Sellers hereby represent and warrant to, and
        covenant with, the Purchaser as follows:

             4.1.  Organization and Qualification.  Each of the Company
        and TPS is a corporation duly incorporated, validly existing and
        in good standing under the laws of the state of its incorporation
        and each has all requisite corporate power and authority to
        conduct its business as currently conducted.

             4.2.  Authorized Capital Stock.  The authorized capital
        stock of the Company at March 1, 1993 is as is set forth in the
        Confidential Placement Memorandum dated March 1, 1993 (the
        "Memorandum").  The authorized capital stock of TPS as of January
        2, 1993 is as is set forth in the Form 10-Q of TPS for the
        quarter ended January 2, 1993 attached as Exhibit E to the
        Memorandum.  All shares of stock of any class described in such
        documents as being issued and outstanding were validly issued and
        outstanding, fully paid and non-assessable as at such date.

             4.3.  Due Execution, Deliver and Performance of the
        Agreements.  The execution, delivery and performance of the
        Agreements (a) have been duly authorized under applicable law by
        all requisite corporate action by the Sellers, (b) will not
        violate any law or the certificates of incorporation or by-laws
        of the Sellers or any provision of any material indenture,
        mortgage, agreement, contract or other material instrument to
        which the Sellers, any of their subsidiaries is a party or by
        which the Sellers, or any of their subsidiaries or any of their

                                       -2-
PAGE
<PAGE>





        properties or assets is bound, or result in a breach of or
        constitute (upon notice or lapse of time or both) a default under
        any such indenture, mortgage, agreement, contract or other
        material instrument, and (c) will not result in the creation or
        imposition of any lien, security interest, mortgage, pledge,
        charge or other encumbrance, of any material nature whatsoever,
        upon any properties or assets of the Sellers, or any of their
        subsidiaries.  Upon their execution and delivery, the Agreements
        will constitute valid and binding obligations of the Sellers
        enforceable in accordance with their respective terms, except as
        enforceability may be limited to applicable bankruptcy,
        insolvency, reorganization, moratorium or similar laws affecting
        creditors' and contracting parties' rights generally and except
        as enforceability may be subject to general principles of equity
        (regardless of whether such enforceability is considered in a
        proceeding in equity or at law) and except as the indemnification
        agreements of the Sellers in Section 7.3 hereof may be legally
        unenforceable.

             4.4.   Issuance, Sale and Delivery of the Units.  In respect
        of the Units to be sold by the Sellers hereunder, the offer, sale
        and delivery of the Securities comprising the Units in accordance
        with the Agreements have been duly authorized under applicable
        law by all requisite corporate action.  The Securities, as and
        when delivered to the Purchasers pursuant to the Agreements, and
        upon payment by the Purchasers of the purchase price therefor,
        will be validly issued and outstanding, fully paid and
        non-assessable.  The issuance and sale of the Units which are the
        subject of this Agreement constitutes an exempt transaction under
        the Securities Act of 1933, as amended (the "Securities Act"),
        and does not require registration thereunder.

             4.5.  Regulatory Matters.  The Company is not in violation
        of any federal or state law or regulation relating to the
        storage, handling or transportation of hazardous or toxic
        materials; the Company has received or received rights to all
        permits, licenses or other approvals required of them under
        applicable federal and state environmental laws and regulations
        to conduct its business as it currently conducted; and the
        Company is in compliance with all terms and conditions of any
        such permit, license or approval, except any such violation of
        law or regulation, failure to receive required permits, licenses
        or other approvals or failure to comply with the terms and
        conditions of such permits, licenses or  approvals which would
        not, singly or in the aggregate, result in a material adverse
        change in the condition (financial or otherwise), business
        prospects, net worth or results of operations of the Company.
        The Company has not received any notice of proceedings relating
        to the revocation or modification of any such permit, license or
        approval which, singly or in the aggregate, if the subject of an
        unfavorable decision, ruling or finding, would result in a
        material adverse change in the condition (financial or
        otherwise), business prospects, net worth or results of
        operations of the Company.

                                       -3-
PAGE
<PAGE>






             4.6.  No Material Change.  There has been no material
        adverse change in the financial condition of the Company or TPS
        since January 2, 1993 or in the results of operations of the
        Company or TPS as compared to relevant prior periods, other than
        as may be described in the Memorandum.  There has been no
        material adverse change in the information set forth in the
        Memorandum since the date thereof which has not been disclosed in
        writing to the Purchaser prior to the Closing.

             4.7.  Accuracy of Information.  The information contained in
        the Memorandum, in final form, is true and correct in all
        material respects as of the date thereof.  Each exhibit to the
        Memorandum was true and correct in all material respects as of
        the date thereof.

             4.8.  Legal Opinion.  Prior to closing, the Associate
        General Counsel of TPS and the Company will deliver his legal
        opinion to the Purchasers substantially to the effect of Sections
        4.1, 4.2, 4.3, 4.4 and 4.5 (provided that such opinion, with
        respect to clause (c) of the first sentence of Section 4.3 and
        with respect to Section 4.5, shall be limited to such counsel's
        knowledge).  

             SECTION 5.  Representations, Warranties and Covenants of the
        Purchaser.

             (a) The Purchaser represents and warrants to, and covenants
        with, the Sellers that:  (i) the Purchaser, taking into account
        the personnel and resources it can practically bring to bear on
        the purchase of the Units contemplated hereby, is knowledgeable,
        sophisticated and experienced in making, and is qualified to
        make, decisions with respect to investments in shares presenting
        an investment decision like that involved in the purchase of the
        Units, including investments in securities issued by the Sellers,
        and has requested, received, reviewed and considered all
        information it deems relevant in making an informed decision to
        purchase the Units; (ii) the Purchaser is acquiring the number of
        Units set forth in Section 2 above for investment and with no
        present intention of distributing any of such Units (this
        representation and warranty not limiting the Purchaser's right to
        sell pursuant to the Registration Statement or to be indemnified
        pursuant to Section 7.3); (iii) the Purchaser will not, directly
        or indirectly, voluntarily offer, sell, pledge,  transfer or
        otherwise dispose of (or solicit any offers to buy, purchase or
        otherwise acquire or take a pledge of) any of the Units except in
        compliance with the Securities Act, and the rules and regulations
        promulgated thereunder; (iv) the Purchaser has completed or
        caused to be completed the Registration Statement Questionnaire
        and the Stock Certificate Questionnaire, both attached hereto as
        Appendix I, for use in preparation of the Registration Statement
        and the answers thereto are true and correct to the best
        knowledge of the Purchaser as of the date hereof and will be true
        and correct as of the effective date of the Registration

                                       -4-
PAGE
<PAGE>





        Statement, and the Purchaser will use reasonable efforts to
        inform the Sellers of any changes in such information; (v) The
        Purchaser has, in connection with its decision to purchase the
        number of Units set forth in Section 2 above, relied solely upon
        the Memorandum and the documents incorporated therein by
        reference and the representations and warranties of the Sellers
        contained herein; and (vi) the Purchaser is an "accredited
        investor" within the meaning of Rule 501 of Regulation D
        promulgated under the Securities Act.

             (b)  The Purchaser hereby covenants with the Sellers not to
        make any sale of the Securities without demonstrating to the
        reasonable satisfaction of the Sellers that such sale does not
        violate any applicable provisions of federal or state securities
        laws and that, in connection with any such sale, the Purchaser
        will complete Appendix II hereto.

             (c)  The Purchaser further represents and warrants to, and
        covenants with, the Sellers that (i) the Purchaser has full
        right, power, authority and capacity to enter into this Agreement
        and to consummate the transactions contemplated hereby and has
        taken all necessary action to authorize the execution, delivery
        and performance of this Agreement, and (ii) upon the execution
        and delivery of this Agreement, this Agreement shall constitute a
        valid and binding obligation of the Purchaser enforceable in
        accordance with its terms, except as enforceability may be
        limited by applicable bankruptcy, insolvency, reorganization,
        moratorium or similar laws affecting creditors' and contracting
        parties rights generally and except as enforceability may be
        subject to general principles of equity (regardless of whether
        such enforceability is considered in a proceeding in equity or at
        law) and except as the indemnification agreements of the
        Purchaser in Section 7.3 hereof may be legally unenforceable.

             SECTION 6.  Survival of Representations, Warranties and
        Agreements.  Except as provided in Section 7.4 and,
        notwithstanding any investigation made by any party to this
        Agreement, all representations and warranties made by the Sellers
        and the Purchaser herein and in the certificates for the
        Securities delivered pursuant hereto shall survive the execution
        of this Agreement, the delivery to the Purchaser of the TPS
        Shares (as defined in Section 7.1(a)) being purchased and the
        payment  therefor for a period of two years from the Closing
        Date, after which time they shall be deemed to be extinguished
        and of no further force and effect.       

             SECTION 7.  Registration of the TPS Shares; Compliance with
        the Securities Act.

             7.1.    Registration Procedures and Expenses.  TPS shall:

             (a)  as soon as practicable, prepare and file with the
                  Securities and Exchange Commission (the "Commission")
                  the Registration Statement on a form available for the

                                       -5-
PAGE
<PAGE>





                  sale of the shares of the common stock of TPS issued
                  pursuant to the exercise of the Warrants (the "TPS
                  Shares") by the Purchaser from time to time;

             (b)  use its best efforts, subject to receipt of necessary
                  information from the Purchasers, to cause the
                  Registration Statement to become effective within 180
                  days after the Closing;

             (c) prepare and file with the Commission such amendments
                 and supplements to the Registration Statement and the
                 prospectus used in connection therewith as may be
                 necessary to keep the Registration Statement effective
                 until all the TPS Shares have been sold pursuant
                 thereto or until, by reason of Rule 144(k) of the
                 Commission under the Securities Act or any other rule
                 of similar effect, the TPS Shares are no longer
                 required to be registered for the sale thereof by the
                 Purchasers;

             (d)  furnish to the Purchaser with respect to the TPS Shares
                 registered under the Registration Statement (and to
                 each Underwriter, if any, of such TPS Shares) such
                 number of copies of  prospectuses and preliminary
                 prospectuses in conformity with the requirements of the
                 Securities Act and such other documents as the
                 Purchaser may reasonably request, in order to
                 facilitate the public sale or other disposition of all
                 or any of the TPS Shares by the Purchaser, provided,
                 however, that the obligation of TPS to deliver copies
                 of prospectuses or preliminary prospectuses to the
                 Purchaser shall be subject to the receipt by TPS of
                 reasonable assurances from the Purchaser that the
                 Purchaser will comply with the applicable provisions of
                 the Securities Act and of such other Securities or blue
                 sky laws as may be applicable in connection with any
                 use of such prospectuses or preliminary prospectuses;

             (e)     file documents required of TPS for normal blue sky
                 clearance in states specified in writing by the
                 Purchaser, provided, however, that TPS shall not be    
                 required to qualify to do business or consent to
                 service of process in any jurisdiction in which it is
                 not now so qualified or has not so consented; and 

             (f)  bear all expenses in connection with the procedures in
                 paragraphs (a) through (e) of this Section 7.1 and the
                 registration of TPS Shares pursuant to the Registration
                 Statement, other than fees and expenses, if any, of
                 counsel or other advisers to the Purchaser or the Other
                 Purchasers.

             The Sellers understand that the Purchaser disclaims being an
        underwriter with respect to TPS Shares, but the Purchaser being

                                       -6-
PAGE
<PAGE>





        deemed an underwriter shall not relieve the Sellers of any
        obligations they have hereunder.

             7.2.  Transfer of the TPS Shares After Registration.  The
        Purchaser agrees that it will not effect any disposition of TPS
        Shares that would constitute a sale within the meaning of the
        Securities Act except upon completion of Appendix II hereto and
        otherwise as contemplated in the Registration Statement referred
        to in Section 7.1.       

             The Purchaser acknowledges that there may occasionally be
        times when TPS must suspend the use of the prospectus forming a
        part of the Registration Statement until such time as an
        amendment to the Registration Statement has been filed by TPS and
        declared effective by the Commission, or until TPS has filed an
        appropriate report with the Commission pursuant to the Securities
        Exchange Act of 1934, as amended.  The Purchaser hereby covenants
        that it will not sell any TPS Shares pursuant to said prospectus
        during the period commencing at the time at which TPS gives it
        notice of the suspension of the use of said prospectus and ending
        at the time TPS gives it notice that it may thereafter effect
        sales pursuant to said prospectus and TPS' indemnification
        obligations in Section 7.3 will not apply to sales made in
        violation of this provision.

             7.3.  Indemnification.  For the purpose of this Section 7.3:

             (a)  the term "Selling Shareholder" shall include the
                  Purchaser and any affiliate of such Purchaser;

             (b)  the term "Registration Statement" shall include any
                  preliminary prospectus, final prospectus, exhibit,
                  supplement or amendment included in or relating to     
                  the Registration Statement referred to in Section 7.1;
                  and 

             (c)  the term "untrue statement" shall include any untrue
                  statement or alleged untrue statement, or any omission
                  or alleged omission to state in the Registration
                  Statement a material fact required to be stated therein
                  or necessary to make the statements therein, in the
                  light of the circumstances under which they were made,
                  not misleading. 

             TPS agrees to indemnify and hold harmless each Selling
        Shareholder from and against any losses, claims, damages or
        liabilities to which such Selling Shareholder may become subject
        (under the Securities Act or otherwise) insofar as such losses,
        claims, damages or liabilities (or actions or proceedings in
        respect thereof) arise out of, or are based upon, any untrue
        statement of a material fact contained in the Registration
        Statement on the effective date thereof, or arise out of any
        failure by TPS to fulfill any undertaking included in the
        Registration Statement and TPS will reimburse such Selling

                                       -7-
PAGE
<PAGE>





        Shareholder for any legal or other expenses reasonably incurred
        in investigating, defending or preparing to defend any such
        action, proceeding or claim, provided, however, that TPS shall
                                     --------- -------
        not be liable in any such case to the extent that such loss,
        claim, damage or liability arises out of, or is based upon, an
        untrue statement made in such Registration Statement in reliance
        upon and in conformity with written information furnished to TPS
        by or on behalf of such Selling Shareholder specifically for use
        in preparation of the Registration Statement, or the failure of
        such Selling Shareholder to comply with the covenants and
        agreements contained in Sections 5(b) or 7.2 hereof respecting
        sale of the TPS Shares.

             The Purchaser agrees to indemnify and hold harmless TPS or
        the Company (and each person, if any, who controls TPS or the
        Company within the meaning of Section 15 of the Securities Act,
        each officer of TPS or the Company who signs the Registration
        Statement and each director of TPS and the Company) from and
        against any losses, claims, damages or liabilities to which TPS
        or the Company (or any such officer, director or controlling
        person) may become subject (under the Securities Act or
        otherwise), insofar as such losses, claims, damages or
        liabilities (or actions or proceedings in respect thereof) arise
        out of, or are based upon, any failure to comply with the
        covenants and agreements contained in Section 5(b) or Section 7.2
        hereof, or any untrue statement of a material fact contained in
        the Registration Statement on the effective date thereof if such
        untrue statement was made in reliance upon and in conformity with
        written information furnished by or on behalf of the Purchaser
        specifically for use in preparation of the Registration
        Statement, and the Purchaser will reimburse TPS and the Company
        (or such officer, director or controlling person), as the case
        may be, for any legal or other expense reasonably incurred in
        investigating, defending or preparing to defend any such action,
        proceeding or claim.   

             Promptly after receipt by any indemnified person of a notice
        of a claim or the beginning of any action in respect of which
        indemnity is to be sought against an indemnifying person pursuant
        to this Section 7.3, such indemnified person shall notify the
        indemnifying person in writing of such claim or of the
        commencement of such action, and, subject to the provisions
        hereinafter stated, in case any such action shall be brought
        against an indemnified person and such indemnifying person shall
        have been notified thereof, such indemnifying person shall be
        entitled to participate therein, and, to the extent it shall
        wish, to assume the defense thereof, with counsel reasonably
        satisfactory to such indemnified person.  After notice from the
        indemnifying person to such indemnified person of its election to
        assume the defense thereof, such indemnifying person shall not be
        liable to such indemnified person for any legal expenses
        subsequently incurred by such indemnified person in connection
        with the defense thereof, provided, however, that if there exists
        or shall exist a conflict of interest that would make it

                                       -8-
PAGE
<PAGE>





        inappropriate, in the opinion of counsel to the indemnified
        person, for the same counsel to represent both the indemnified
        person and such indemnifying person or any affiliate or associate
        thereof, the indemnified person shall be entitled to retain its
        own counsel at the expense of such indemnifying person; provided,
        however, that no indemnifying person shall be responsible for the
        fees and expenses of more than one separate counsel for all
        indemnified parties.

             7.4.  Termination of Conditions and Obligations.  The
        conditions precedent imposed by Section 5 or this Section 7 upon
        the transferability of the Securities and the TPS Shares shall
        cease and terminate as to any particular number of the Securities
        or the TPS Shares when such Securities or such TPS Shares, as the
        case may be, shall have been effectively registered under the
        Securities Act and sold (or, in the case of the TPS Shares,
        otherwise disposed of in accordance with the intended method of
        disposition set forth in the Registration Statement covering such
        TPS Shares) or at such time as an opinion of counsel satisfactory
        to TPS and the Company shall have been rendered to the effect
        that such conditions are not necessary in order to comply with
        the Securities Act.

             7.5.  Information Available.  So long as the Registration
        Statement is effective covering the resale of the TPS Shares
        owned by the Purchaser, TPS will furnish to the Purchaser:

             (a)  as soon as practicable after available (but in the case
                  of TPS' Annual Report to Shareholders, within 120 days
                  after the end of each fiscal year of TPS), one copy of
                  (i) its Annual Report to Shareholders (which Annual
                  Report shall contain financial statements audited in
                  accordance with  generally accepted accounting
                  principles by a national firm of certified public
                  accountants), (ii) if not included in substance in the
                  Annual Report to Shareholders, its Annual Report on
                  Form 10-K, (iii) each of its Quarterly Reports to
                  Shareholders and, if not included in substance in its
                  Quarterly Reports to Shareholders, its quarterly report
                  on Form 10-Q, and (iv) a full copy of the particular
                  Registration Statement covering the TPS Shares (the
                  foregoing, in each case, excluding exhibits);

             (b)  upon the reasonable request of the Purchaser, all
                  exhibits excluded by the parenthetical to subparagraph
                  (a)(iv) of this Section 7.5 and all other information
                  that is generally available to the public; and

             (c)  upon the reasonable request of the Purchaser, an
                  adequate number of copies of the prospectuses to supply
                  to the American Stock Exchange or any other party
                  requiring such prospectuses; and 



                                       -9-
PAGE
<PAGE>





        TPS, upon the reasonable request of the Purchaser, will meet with
        the Purchaser or a representative thereof at TPS' headquarters to
        discuss all information relevant for disclosure in the
        Registration Statement covering the TPS Shares and will otherwise
        cooperate with any Purchaser conducting an investigation for the
        purpose of reducing or eliminating such Purchaser's exposure to
        liability under the Securities Act, including the production of
        information at TPS' headquarters.  

             In addition, so long as the Shares are owned by the
        Purchaser, the Company will furnish to the Purchaser (i) as soon
        as practicable after available, one copy of a quarterly report to
        shareholders consisting of an unaudited profit and loss statement
        and a balance sheet of the Company and (ii) as soon as
        practicable after available, one copy of its annual report to
        shareholders consisting of an unaudited profit and loss statement
        and an unaudited balance sheet of the Company.

             SECTION 8.  Liquidity Feature.  In the event the shares of
        the Common Stock of the Company have not been sold pursuant to an
        underwritten public offering registered under the Securities Act
        on or before December 16, 1997, the Sellers will seek to sell the
        Company on the most favorable terms available prior to December
        16, 1998.

             SECTION 9.  Broker's Fee.  The parties hereto hereby
        represent that there are no brokers or finders entitled to
        compensation in connection with the transactions contemplated
        hereby.       

             SECTION 10.  Notices.  All notices, requests, consents and
        other communications hereunder shall be in writing, shall be
        mailed by first-class registered or certified airmail, postage
        prepaid, and shall be deemed given when so mailed:

             (a) if to the Sellers, to

                Thermo Process Systems, Inc.
                TPST Soil Recycles of Florida Inc.
                c/o Thermo Electron Corporation
                81 Wyman Street
                P. O. Box 9046 
                Waltham, Massachusetts 02254-9046
                Attention:  Sandra L. Lambert, Secretary

             with a copy to:

                Seth H. Hoogasian
                Thermo Electron Corporation
                81 Wyman Street
                P. O. Box 9046
                Waltham, Massachusetts 02254-9046



                                      -10-
PAGE
<PAGE>





             or to such other persons at such other places as the Sellers
        shall designate to the Purchaser in writing; and

             (b)  if to the Purchaser, at its address as set forth at the
        end of this Agreement, or at such other address or addresses as
        may have been furnished to the Sellers in writing.

             SECTION 11.  Changes.  This Agreement may not be modified or
        amended except pursuant to an instrument in writing signed by the
        Sellers and the Purchaser.

             SECTION 12.  Headings.  The headings of the various sections
        of this Agreement have been inserted for convenience of reference
        only and shall not be deemed to be part of this Agreement.

             SECTION 13.  Severability.  In case any provision contained
        in this Agreement should be invalid, illegal or unenforceable in
        any respect, the validity, legality, and enforceability of the
        remaining provisions contained herein shall not in any way be
        affected or impaired thereby.

             SECTION 14.  Governing Law.  This Agreement shall be
        governed by and construed in accordance with the laws of the
        Commonwealth of Massachusetts and Federal law.

             SECTION 15.  Counterparts.  This Agreement may be executed
        in two or more counterparts, each of which shall constitute an
        original, but all of which, when taken together, shall constitute
        but one instrument, and shall become effective when one or more
        counterparts have been signed by each party hereto and delivered
        to the other parties.






                  [Remainder of Page Intentionally Left Blank]

















                                      -11-
PAGE
<PAGE>





             IN WITNESS WHEREOF, the parties hereto have caused this
        Agreement to be executed by their duly authorized representatives
        as of the day and year first above written.

        TPST SOIL RECYCLERS OF             THERMO PROCESS SYSTEMS INC. 
        FLORIDA INC.

        By:___________________________     By:___________________________

        Print or Type:                     Name of Purchaser
                                           (Individual or Institution):

                                           ______________________________

                                           Name of Individual 
                                           representing Purchaser 
                                           (if an Institution):

                                           ______________________________
                                           Title of Individual 
                                           representing Purchaser
                                           (if an Institution):

                                           ______________________________

        Signature by:                      Individual Purchaser or 
                                           Individual Representing 
                                           Purchaser:

                                           ______________________________
                                           (Signature)

                                           Address:______________________

                                           Telephone:____________________

                                           Telex:________________________


















                                      -12-
PAGE
<PAGE>





                                                          APPENDIX I 
                                                          (one of two)



        THERMO PROCESS SYSTEMS INC. 
        TPST SOIL RECYCLERS OF FLORIDA INC.


                         STOCK CERTIFICATE QUESTIONNAIRE


             Please provide us with the following information:

        1.   The exact name that your shares of Common
             Stock and Warrants are to be registered in 
             (this is the name that will appear on your 
             certificate(s)).  You may use a nominee 
             name if appropriate:     ___________________________________

         2.  The relationship between the Purchaser 
             and the Registered Holder listed in 
             response to item 1 above: __________________________________

        3.   The mailing address of the Registered 
             Holder listed in response 
             to item 1 above:         ___________________________________

                                      ___________________________________


        4.   The Social Security Number or 
             Tax Identification Number of 
             the Registered Holder listed in 
             response to item 1 above: __________________________________




















                                      -13-
PAGE
<PAGE>





                                                     APPENDIX I 
                                                     (two of two)


        THERMO PROCESS SYSTEMS INC. 
        TPST SOIL RECYCLERS OF FLORIDA INC.


                      REGISTRATION STATEMENT QUESTIONNAIRE 


             In connection with the preparation of the Registration
        Statement, please provide use with the following information:

             1. Pursuant to the "Selling Shareholder" section of the
                 Registration Statement, please state your or your
                 organization's name exactly as it should appear in the
                 Registration Statement and provide the following
                 information, as of March 1, 1993:

                        ________________________________
                                       (name)

             2. Number of shares of common stock of TPS beneficially
                 owned (meaning shares owned or controlled or which the
                 Purchaser has the right to acquire) by the Purchaser,
                 other than the Shares being purchased pursuant hereto:

                        ________________________________
                       (number of shares)

             3.  Have you or your organization had any position, office 
                or other material relationship within the past three 
                years with TPS or its affiliates? 

                        _______Yes               ______No

                If yes, please indicate the nature of any such
             relationships below: 

        ________________________________________________________________

        ________________________________________________________________

        ________________________________________________________________










                                      -14-
PAGE
<PAGE>





                                                     APPENDIX II  


        THERMO PROCESS SYSTEMS INC. 
        TPST SOIL RECYCLERS OF FLORIDA INC.


                   PURCHASER'S CERTIFICATE OF SUBSEQUENT SALE

             The undersigned, [an officer of, or other person duly
        authorized by] 
         ________________________________________________________________
                 [fill in official name of individual or institution] 

         hereby certifies that he/she [said institution] is the Purchaser
        of the shares or warrants evidenced by the attached stock or  
        warrant certificate, and as such, sold such shares or warrants on
        ________________ in accordance with registration statement  
        number __________________________
             [fill in the number of or 
             otherwise identify registration 
             statement]

        ______________________________and the requirement of delivering a
        current prospectus and current annual and quarterly reports by
        the Company has been complied with in connection with such sale.

        Print or Type:

             Name of Purchaser (Individual or
                Institution):              ____________________________

             Name of Individual representing
               Purchaser (if an Institution):
                                           _____________________________

             Title of Individual representing
               Purchaser (if an Institution):
                                           _____________________________


        Signature by:

             Individual Purchaser (or Individual 
               representing Purchaser 
               (if an Institution)):       _____________________________

          







                                      -15-








                                                              EXHIBIT 5.1

                              Thermo TerraTech Inc.
                                 81 Wyman Street
                             Waltham, MA 02254-9046

                                  April 3, 1996


        Thermo TerraTech Inc.
        81 Wyman Street
        Waltham, MA 02254-9046

             Re:  Registration Statement on Form S-2 Relating to 
                  Warrants to Purchase 700,500 Shares of Common 
                  Stock and 700,500 Shares of Common Stock 
                  Issuable Upon Exercise of Such Warrants

        Dear Sirs:

             I am General Counsel to Thermo TerraTech Inc., a Delaware
        corporation (the "Company"), and have acted as counsel in
        connection with the registration under the Securities Act of
        1933, as amended, on Form S-2 (the "Registration Statement"), of
        (i) Common Stock Purchase Warrants (the "Warrants") to purchase
        700,500 shares of Common Stock, par value $.10 per share (the
        "Common Stock"), of the "Company, and (ii) the issuance of
        700,500 shares of Common Stock (the "Shares") that may be
        acquired upon exercise of the Warrants.  

             I or a member of my staff have reviewed the corporate
        proceedings taken by the Company with respect to the
        authorization of the issuance of the Warrants and the Shares.  I
        or a member of my staff have also examined and relied upon
        originals or copies, certified or otherwise authenticated to my
        satisfaction, of all corporate records, documents, agreements or
        other instruments of the Company and have made all investigations
        of law and have discussed with the Company's representatives all
        questions of fact that I have deemed necessary or appropriate.

             Based upon and subject to the foregoing, I am of the opinion
        that:

             1.   The Company is a corporation duly organized, validly
        existing and in corporate good standing under the laws of the
        State of Delaware.

             2.   The Warrants have been duly authorized and validly
        issued by the Company.  

             3.   The issuance and sale of the Shares has been duly
        authorized by the Company.  The Shares, when issued and sold upon
        exercise of the Warrants in accordance with their terms, will be
        validly issued, fully paid and nonassessable.
PAGE
<PAGE>






             I hereby consent to the filing of this opinion as Exhibit
        5.1 to the Registration Statement.

                                           Very truly yours,



                                           Seth H. Hoogasian
                                           General Counsel

        SHH/mj








                                                             EXHIBIT 23.1


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS




        As independent public accountants, we hereby consent to the
        incorporation by reference in this registration statement of our
        report dated May 9, 1995 (except with respect to the matter
        discussed in Note 14 as to which the date is June 2, 1995)
        included in Thermo Terra Tech Inc.'s Form 10-K for the year ended
        April 1, 1995 and to all references to our Firm included in this
        registration statement.



        ARTHUR ANDERSEN LLP

        Boston, Massachusetts  
        March 25, 1996








                                                             EXHIBIT 23.2


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



        As independent public accountants, we hereby consent to the use
        of our report dated October 26, 1994, included in Thermo
        TerraTech, Inc.'s (formerly Thermo Process Systems, Inc.)
        Registration Statement on Form S-2, and to other references to
        our Firm included in or made a part of the Registration
        Statement.


        March 26, 1996                TROUT, EBERSOLE & GROFF, LLP
        Lancaster, Pennsylvania       Certified Public Accountants









                                                             EXHIBIT 23.3



                          INDEPENDENT AUDITORS' CONSENT


        The Board of Directors
        Thermo TerraTech Inc.:

        We consent to the use of our report incorporated by reference to
        our firm under the heading "Experts" in the prospectus.


                                           KPMG Peat Marwick LLP




        Boston, Massachusetts
        March 26, 1996








                                                             EXHIBIT 23.4


                     CONSENT OF INDEPENDENT PUBLIC AUDITORS


        The Board of Directors
        Thermo TerraTech Inc.:

        We consent to the inclusion herein of our report dated April 29,
        1994, with respect to the consolidated balance sheets of
        Remediation Technologies, Inc. and subsidiary as of December 31,
        1993 and 1992, and the related consolidated statements of
        earnings, stockholders' equity and cash flows for the years then
        ended.

                                           NARDELLA & TAYLOR



        Lexington, Massachusetts
        March 25, 1996








                                                             EXHIBIT 23.5


                     CONSENT OF INDEPENDENT PUBLIC AUDITORS



        We consent to the reference to our firm under the caption
        "Experts" in the Registration Statement on Form S-2 and related
        Prospectus of Thermo TerraTech Inc. for the registration of (i)
        warrants to purchase 700,500 shares of its common stock and (ii)
        the shares of common stock underlying such warrants, and to the
        incorporation by reference therein of our report dated February
        28, 1995 with respect to the financial statements of RETEC/TETRA
        L.C. included in the Current Report on Form 8-K/A of Thermo
        TerraTech Inc. dated December 8, 1995 filed with the Securities
        and Exchange Commission.


                                           ERNST & YOUNG LLP



        Houston, Texas
        March 26, 1996








                                                               EXHIBIT 99


                            CERTIFICATE OF AMENDMENT
                                       OF 
                      RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                           THERMO PROCESS SYSTEMS INC.




             Thermo Process Systems Inc. (the "Corporation"), a

        corporation organized and existing under the laws of the State of

        Delaware, hereby certifies as follows, pursuant to Section 242 of

        the General Corporation Law of the State of Delaware:

             1.   That Article FIRST of the Restated Certificate of

        Incorporation of the Corporation, as restated on July 24, 1986

        and amended on September 29, 1988 and on October 19, 1989, is

        hereby amended to change the name of the Corporation to Thermo

        TerraTech Inc. and that such amendment is hereby effected by

        deleting said Article in its entirety and inserting the following

        in substitution therefor:

                  "Article FIRST:     The name of the Corporation is:
                                      Thermo TerraTech Inc."



             2.   That the Board of Directors of the Corporation at a

        meeting held on December 13, 1995 duly adopted the following

        resolution:

             RESOLVED: That the Directors recommend that the Shareholders

                       of the Corporation approve an amendment to the 

                       Corporation's Certificate of Incorporation 

                       changing the name of the Corporation to Thermo 

                       TerraTech Inc.
PAGE
<PAGE>






             3.   That the amendment to the Corporation's Restated

        Certificate of Incorporation was duly adopted by the affirmative

        vote of Stockholders of the Corporation holding in excess of 50%

        of the shares of Common Stock, $.10 par value per share, of the

        Corporation in accordance with the provisions of Section 242 of

        the General Corporation Law of the State of Delaware.



             IN WITNESS WHEREOF, Thermo Process Systems Inc. has caused

        this Certificate of Amendment to be signed by John P. Appleton  

        its President and Chief Executive Officer and attested to by

        Sandra L. Lambert, its Secretary, this 13th day of December,

        1995.

                                      Thermo Process Systems Inc.

                                      By:  /s/ John P. Appleton
                                           John P. Appleton
                                           President and Chief 
                                           Executive Officer


        Attest:

        By: /s/ Sandra L. Lambert
            Sandra L. Lambert, Secretary
PAGE
<PAGE>





                            CERTIFICATE OF AMENDMENT 

                                       OF

                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF 

                           THERMO PROCESS SYSTEMS INC.



             Thermo Process Systems Inc. (the "Corporation"), a

        corporation organized and existing under the laws of the State of

        Delaware, hereby certifies as follows, pursuant to Section 242 of

        the General Corporation Law of the State of Delaware:

             1.   That Article FOURTH of the Restated Certificate of

        Incorporation of the Corporation, as restated on July 24, 1986

        and amended on September 29, 1988, is hereby amended to increase

        the number of authorized shares of the Corporation's Common

        Stock, $0.10 par value per share, from 20,000,000 shares to

        30,000,000 shares and that such amendment is hereby effected by

        deleting said Article in its entirety and inserting the following

        in substitution therefor:

             "FOURTH:  The total number of shares of stock which the
        Corporation shall have authority to issue is Thirty Million
        (30,000,000) and the par value of each share is Ten Cents
        ($0.10)."


             2.   That the Board of Directors of the Corporation at a

        meeting held on August 14, 1989, duly adopted the following

        resolution:

             RESOLVED, that the Board of Directors hereby recommends that
                       the Shareholders of the Corporation, at the
                       meeting called for September 21, 1989, approve an
                       amendment to the Corporation's Certificate of
                       Incorporation increasing number of shares of
PAGE
<PAGE>





                       Common Stock, $.10 Par Value from 20 million
                       shares to 30 million shares.


             3.   That the amendment to the Corporation's Restated

        Certificate of Incorporation was duly adopted by affirmative vote

        of Stockholders of the Corporation holding in excess of 50% of

        the shares of Common Stock, $0.10 par value per share, of the

        Corporation in accordance with the provisions of Section 242 of

        the General Corporation Law of the State of Delaware.



             IN WITNESS WHEREOF, Thermo Process Systems Inc. has caused

        this Certificate of Amendment to be signed by Walter J.

        Bornhorst, its Chairman of the Board of Directors, Chief

        Executive Officer and President, and attested by Paul F. Ferrari,

        its Secretary, this 2nd day of October, 1989.

                                      THERMO PROCESS SYSTEMS INC.

                                      By: /s/ Walter J. Bornhorst   `
                                          Walter J. Bornhorst,
                                          Chairman of the Board and
                                          Chief Executive Officer
                                                  

        ATTEST:

        By: /s/ Paul F. Ferrari
            Paul F. Ferrari,
            Secretary
PAGE
<PAGE>





                            CERTIFICATE OF AMENDMENT 

                                       OF

                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF 

                           THERMO PROCESS SYSTEMS INC.



             Thermo Process Systems Inc. (the "Corporation"), a

        corporation organized and existing under the laws of the State of

        Delaware, hereby certifies as follows, pursuant to Section 242 of

        the General Corporation Law of the State of Delaware:

             1.   That Article FOURTH of the Restated Certificate of

        Incorporation of the Corporation, as restated on July 24, 1986,

        is hereby amended to increase the number of authorized shares of

        the Corporation's Common Stock, $0.10 par value per share, from

        10,000,000 shares to 20,000,000 shares and that such amendment is

        hereby effected by deleting said Article in its entirety and

        inserting the following in substitution therefor:

             "FOURTH:  The total number of shares of stock which the
        Corporation shall have authority to issue is Twenty Million
        (20,000,000) and the par value of each share is Ten Cents
        ($0.10)."


             2.   That the Board of Directors of the Corporation at a

        meeting held on May 26, 1988, duly adopted the following

        resolution:

        RESOLVED:      That the Board of Directors recommend to the
                       Stockholders the approval of an amendment to the
                       Corporation's Restated Certificate of
                       Incorporation to increase the Corporation's
                       authorized voting Common Stock, $.10 par value
                       from 10,000,000 to 20,000,000 shares.
PAGE
<PAGE>






             3.   That the amendment to the Corporation's Restated

        Certificate of Incorporation was duly adopted by affirmative vote

        of Stockholders of the Corporation holding in excess of 50% of

        the shares of Common Stock, $0.10 par value per share, of the

        Corporation in accordance with the provisions of Section 242 of

        the General Corporation Law of the State of Delaware.



             IN WITNESS WHEREOF, Thermo Process Systems Inc. has caused

        this Certificate of Amendment to be signed by Walter J.

        Bornhorst, its Chairman of the Board of Directors, Chief

        Executive Officer and President, and attested by Paul F. Ferrari,

        its Secretary, this 26th day of September, 1988.

                                           THERMO PROCESS SYSTEMS INC.

                                           By: /s/ Walter J. Bornhorst
                                               Walter J. Bornhorst,
                                               Chairman of the Board,
                                               Chief Executive Officer
                                               and President

        ATTEST:

        By: /s/ Paul F. Ferrari
            Paul F. Ferrari,
            Secretary
PAGE
<PAGE>





                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF 

                           THERMO PROCESS SYSTEMS INC.


        Thermo Process Systems Inc., a corporation organized and existing
        under the laws of the State of Delaware, hereby certifies as
        follows:  The date of filing of its original Certificate of
        Incorporation with the Secretary of the State of Delaware was May
        30, 1986.  This Restated Certificate of Incorporation restates
        and integrates all amendments to the Restated Certificate of
        Incorporation of this corporation, filed with the Secretary of
        State of Delaware on June 23, 1986, and has been duly adopted by
        the written consent of the sole stockholder of this corporation
        in accordance with  Sections 228, 242 and 245 of the General
        Corporation Law of the State of Delaware.

        FIRST.    The name of the corporation is Thermo Process 
                  Systems Inc.

        SECOND.   The address of its registered office in the State of
                  Delaware if No. 1209 Orange Street, in the City of
                  Wilmington 19805, County of New Castle.  The name of
                  its registered agent at such address is Corporation
                  Trust Company.

        THIRD.    The purpose of the corporation is to engaged in any
                  lawful act or activity for which corporations may be
                  organized under the General Corporation Law of the
                  State of Delaware.

        FOURTH.   The total number of shares of stock which the
                  corporation shall have the authority to issue is Ten
                  Million (10,000,000), and the par value of each of such
                  shares is Ten Cents ($0.10), amounting in the aggregate
                  to One Million and No/100 Dollars ($1,000,000).

        FIFTH.    The Board of Directors shall have the power to adopt,
                  amend or repeal the By-Laws.

        SIXTH.    No director shall be personally liable to the
                  corporation or its stockholders for monetary damages
                  for any breach of fiduciary duty by such director as a
                  director.  Notwithstanding the foregoing sentence, a
                  director shall be liable to the extent provided by
                  applicable law (i) for breach of the director's duty of
                  loyalty to the corporation or its stockholders, (ii)
                  for acts or omissions not in good faith or which
                  involve intentional misconduct or a knowing violation
                  of law, (iii) pursuant to Section 174 of the Delaware
                  General Corporation Law or (iv) for any transaction
                  from which the director derived an improper personal
PAGE
<PAGE>





                  benefit.  No amendment to or repeal of this Article
                  SIXTH shall apply to or have any effect on the
                  liability or alleged liability of any director of the
                  corporation for or with respect to any acts or
                  omissions of such director occurring prior to such
                  amendment.

        IN WITNESS WHEREOF, this Restated Certificate of Incorporation
        has been executed on behalf of the undersigned corporation by its
        duly authorized officer and attested to by its duly authorized
        Secretary this 23rd day of July, 1986.

                                           THERMO PROCESS SYSTEMS INC.

                                           By: /s/ Peter G. Pantazelos
                                               Peter G. Pantazelos
                                               Vice President and Chief 
                                               Financial Officer

        ATTEST:

        By: /s/ Paul F. Ferrari
            Paul F. Ferrari
            Secretary



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