THERMO TERRATECH INC
S-3, 1996-03-29
TESTING LABORATORIES
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                   As filed with the Securities and Exchange 
                          Commission on March 29, 1996
                                               Registration No. 333-_____
                                                                         

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

                                    FORM S-3 
                             Registration Statement
                                      Under
                           The Securities Act of 1933
                               __________________

                              THERMO TERRATECH INC.
             (Exact name of registrant as specified in its charter)

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

                  Delaware                                04-2925807
        (State or other jurisdiction of                (I.R.S. Employer
        incorporation or organization)                Identification No.)

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

                                 81 Wyman Street
                                 P. O. Box 9046
                        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 
                              ______________________

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






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

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

                               __________________

                         CALCULATION OF REGISTRATION FEE

                                   Proposed
          Title of                  Maximum     Proposed
         securities     Amount     Offering     Maximum      Amount of
            to be        to be     Price Per   Aggregate    Registration
         registered   registered     Share   Offering Price     Fee

        Common Stock,
          $.10 par      111,529                                   
          value per     shares      $13 3/8  $1,491,701(1)    $515 (1)
           share                      (1)

        (1)  Estimated solely for the purpose of calculating the amount
             of the registration fee pursuant to Rule 457(c) based on the
             average of the high and low sales prices of the Common Stock
             on the American Stock Exchange on March 28, 1996.


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


             THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON
        SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE
        DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH
        SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL
        THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
        THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT
        SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING
        PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.










        PROSPECTUS
PAGE
<PAGE>





                                 111,529 Shares

                              THERMO TERRATECH INC.

                                  Common Stock

             This Prospectus relates to 111,529 shares (the "Shares") of
        Common Stock, par value $.10 per share (the "Common Stock"), of
        Thermo TerraTech Inc. (the "Company").  The Shares may be offered
        by the Thermo Electron Corporation Employees Stock Ownership Plan
        and Trust (the "Selling Shareholder" or the "Plan"), a profit
        sharing plan qualified under Section 401(a) of the Internal
        Revenue Code of 1986, as amended (the "Code"), from time to time
        in transactions on the American Stock Exchange, in negotiated
        transactions, through the writing of options on the Shares, or a
        combination of such methods of sale, at fixed prices that may be
        changed, at market prices prevailing at the time of sale, at
        prices related to such prevailing market prices or at negotiated
        prices.  The Selling Shareholder may effect such transactions by
        selling the Shares to or through broker-dealers, and such
        broker-dealers may receive compensation in the form of discounts,
        concessions or commissions from the Selling Shareholder and/or
        the purchasers of the Shares for whom such broker-dealers may act
        as agent or to whom they sell as principal, or both (which
        compensation to a particular broker-dealer might be in excess of
        customary commissions).  Alternatively, the Selling Shareholder
        may distribute some or all of the Shares to participants in the
        Plan who elect to receive distributions in kind upon the
        termination of the Plan.  Shares not so sold or distributed may
        be transferred to a successor plan qualified under Section 401(a)
        of the Code.  The Selling Shareholder and any broker-dealer who
        acts in connection with the sales of Shares hereunder may be
        deemed to be "underwriters" as that term is defined in the
        Securities Act of 1933, as amended (the "Securities Act"), and
        any commissions received by them and profit on any resale of the
        Shares as principal might be deemed to be underwriting discounts
        and commissions under the Securities Act.  The Shares were
        originally acquired by the Selling Shareholder in open market
        transactions or in the form of contributions from the Company or
        from Thermo Electron Corporation, which owns a majority of the
        Company's outstanding capital stock ("Thermo Electron").  See
        "Selling Shareholder."

                                  _____________


          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 ACCU-
               RACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESEN-
                  TATION TO THE CONTRARY IS A CRIMINAL OFFENSE.


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







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


        _________, 1996 

                                  _____________


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

                                  _____________


                              AVAILABLE INFORMATION

             The Company is subject to the informational requirements of
        the Securities Exchange Act of 1934, as amended (the "Exchange
        Act"), and in accordance therewith files reports, proxy
        statements and other information with the Securities and Exchange
        Commission (the "Commission").  Such reports, proxy statements
        and other information can be inspected and copied at the public
        reference facilities maintained by the Commission at 450 Fifth
        Street, N.W., Washington, D.C. 20549, and at the following
        Regional Offices of the Commission:  500 West Madison Street,
        Suite 1400, Chicago, Illinois 60661, and 7 World Trade Center,
        Suite 1300, New York, New York 10048.  Copies of such material
        can also be obtained from the Public Reference Section of the

                                        2
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<PAGE>





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

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

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


                                   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.

                                        3
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<PAGE>





        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. 

                  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. 

                               SELLING SHAREHOLDER

             The following table sets forth the name of the Selling
        Shareholder, the number of shares of Common Stock owned by the
        Selling Shareholder, the number of Shares that may be offered by
        the Selling Shareholder pursuant to this Prospectus, and the

                                        4
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<PAGE>





        number of Shares the Selling Shareholder will own after
        completion of the offering, assuming all of the Shares being
        offered hereby are sold. 

                                    Shares of
                                      Common                   Shares
                                      Stock                     Owned
                                      Owned                     After
                                     Prior to     Shares     Completion
            Selling Shareholder        the         Being       of the
            -------------------
                                     Offering     Offered     Offering
                                     --------     -------     --------


             Thermo Electron
             Corporation Employees   111,529      111,529         0
             Stock Ownership Plan
             and Trust

        __________________

             (1)  Certain officers and directors of the Company and/or of
                  Thermo Electron are trustees of the Selling
                  Shareholder.

             The Shares are being registered to permit the sale of the
        Shares by the Selling Shareholder to the public.  All of the
        Shares being offered by the Selling Shareholder were originally
        acquired by the Selling Shareholder in open market transactions
        or in the form of contributions from the Company or from Thermo
        Electron.  The Selling Shareholder is selling the Shares in
        connection with the liquidation and termination of the Plan in
        order to repay loans made to the Plan by Thermo Electron and to
        distribute the remaining proceeds to beneficiaries of the Plan.
        Thermo Electron has agreed to bear all expenses (other than
        underwriting discounts, selling commissions, and fees and
        expenses of counsel and other advisors to the Selling
        Shareholder) in connection with the registration and sale of the
        Shares being offered by the Selling Shareholder.  See "Sale of
        Shares."  The Company has agreed to prepare and file such
        amendments and supplements to the Registration Statement of which
        this Prospectus forms a part as may be necessary to keep the
        Registration Statement effective until all the Shares registered
        thereunder 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 Shares are no longer required
        to be registered for the sale thereof by the Selling Shareholder.


                                 SALE OF SHARES

             The Company has been advised that the Selling Shareholder
        may sell Shares from time to time in transactions on the American
        Stock Exchange, in negotiated transactions, through the writing
        of options on the Shares, or a combination of such methods of

                                        5
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<PAGE>





        sale, at fixed prices which may be changed, at market prices
        prevailing at the time of sale, at prices related to such
        prevailing market price or at negotiated prices.  The Selling
        Shareholder may effect such transactions by selling the Shares to
        or through broker-dealers, and such broker-dealers may receive
        compensation in the form of discounts, concessions or commissions
        from the Selling Shareholder and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).
        Alternatively, the Selling Shareholder may distribute some or all
        of the Shares to participants in the Plan who elect to receive
        distributions in kind upon the termination of the Plan.  Shares
        not so sold or distributed may be transferred to a successor plan
        qualified under Section 401(a) of the Code.  

             The Selling Shareholder and any broker-dealers who act in
        connection with the sale of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act, and
        any commissions received by them and profit on any resale of the
        Shares as principal might be deemed to be underwriting discounts
        and commissions under the Securities Act.  The Company has agreed
        to indemnify the Selling Shareholder against certain liabilities,
        including liabilities under the Securities Act as underwriters or
        otherwise.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

             The following documents previously filed 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.



                                        6
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<PAGE>





             (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.

                  All reports or proxy statements filed by the Company
        pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange
        Act subsequent to the date of this Prospectus and prior to the
        termination of the offering made hereby shall be deemed to be
        incorporated by reference in this Prospectus and to be a part
        hereof from the respective dates of filing such documents.  Any
        statement contained in a document incorporated or deemed to be
        incorporated by reference herein shall be deemed to be modified
        or superseded for purposes of this Prospectus to the extent that
        a statement contained herein modifies, supersedes or replaces
        that statement.  Any statement so modified or superseded shall
        not be deemed, except as so modified or superseded, to constitute
        a part of this Prospectus.


                                  LEGAL MATTERS

             The validity of the Common Stock offered hereby has been
        passed upon by Seth H. Hoogasian, Esq., General Counsel of the
        Company.  Mr. Hoogasian owns or has the right to acquire,
        pursuant to the exercise of stock options, shares of the Common
        Stock of the Company and of certain of the Company's
        subsidiaries, the fair market value of which exceeds $50,000.


                                     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

                                        7
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        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.


























                                        8
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                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

             Item 14.  Other Expenses of Issuance and Distribution.

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

             Registration fee - Securities and Exchange
             Commission ...................................$      515
             Legal fees and expenses ......................     1,000
             Accounting fees and expenses .................     5,000

             Miscellaneous ................................     1,000
                  Total ...................................$    7,515

             Item 15.  Indemnification of Directors and Officers. 

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

             Thermo Electron Corporation has an insurance policy which
        insures the 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.


             Item 16.  Exhibits and Financial Statement Schedules.

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


             Item 17.  Undertakings.

             (a)  The undersigned Registrant hereby undertakes:


                                        9
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                   (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
                       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.

                                       10
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                  (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.

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

             (c)  Insofar as indemnification for liabilities arising
        under the Securities Act of 1933 may be permitted to directors,
        officers and controlling persons of the Registrant pursuant to
        the foregoing provisions, or otherwise, the Registrant has been
        advised that in the opinion of the Securities and Exchange
        Commission such indemnification is against public policy as
        expressed in the Act and is, therefore, unenforceable.  In the
        event that a claim for indemnification against such liabilities
        (other than the payment by the Registrant of expenses incurred or
        paid by a director, officer or controlling person of the
        Registrant in the successful defense of any action, suit or
        proceeding) is asserted by such director, officer or controlling
        person in connection with the securities being registered, the
        Registrant will, unless in the opinion of its counsel the matter
        has been settled by controlling precedent, submit to a court of
        appropriate jurisdiction the question whether such
        indemnification by it is against public policy as expressed in
        the Act and will be governed by the final adjudication of such
        issue.




















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                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of 1933,
        the Registrant hereby certifies that it has reasonable grounds to
        believe that it meets all of the requirements for filing on Form
        S-3 and has duly caused this Registration Statement to be signed
        on its behalf by the undersigned, thereunto duly authorized, in
        the City of Waltham, Commonwealth of Massachusetts, on this 29th
        day of March, 1996.

                                      THERMO TERRATECH INC.

                                      By:  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
              ---------         -----                      ----
                                                                   


                               President, Chief
                               Executive 
        John P. Appleton       Officer and Director     March 29, 1996
        John P. Appleton

                               Vice President, Chief
                               Financial Officer and 
        John N. Hatsopoulos    Director                 March 29, 1996

        John N. Hatsopoulos






                                       12
PAGE
<PAGE>





              Signature         Title                      Date
              ---------         -----                      ----
                                                                   



                               Chief Accounting
        Paul F. Kelleher       Officer                  March 29, 1996
        Paul F. Kelleher


        George N. Hatsopoulos  Director                 March 29, 1996
        George N. Hatsopoulos



        Donald E. Noble        Director                 March 29, 1996
        Donald E. Noble



        William A. Rainville   Chairman of the Board    March 29, 1996
        William A. Rainville



        Polyvios C. Vintiadis  Director                 March 29, 1996
        Polyvios C. Vintiadis


                               Director                 March __, 1996
        Paul E. Tsongas
























                                       13
PAGE
<PAGE>





                                  EXHIBIT INDEX


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

               
              5      Opinion of Seth H. Hoogasian, Esq.          

             23(a)    Consent of Arthur Andersen LLP    

               (b)    Consent of Trout, Ebersole & Groff 

               (c)    Consent of KPMG Peat Marwick LLP 

               (d)    Consent of Nardella & Taylor 

               (e)    Ernst & Young LLP 

               (f)    Consent of Seth H. Hoogasian, Esq.
                      (contained in Exhibit 5)

             24       Power of Attorney (See Signature Page)







































                                                                EXHIBIT 5



                              THERMO TERRATECH INC.
                                 81 Wyman Street
                               Waltham, MA  02254

                                 March 29, 1996


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

             Re:  Registration Statement on Form S-3

        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-3 (the "Registration Statement"), of
        111,529 shares of the Company's Common Stock, $.10 par value per
        share (the "Shares"), which may from time to time be sold by a
        shareholder of the Company.

             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 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 investigations of law and have
        discussed with the Company's representatives questions of fact
        that I or a member of my staff have deemed necessary or
        appropriate.

             Based upon and subject to the foregoing, I am of the opinion
        that the Shares have been duly authorized by the Company and are
        validly issued, fully paid and non-assessable.

             I hereby consent to the filing of this opinion as Exhibit 5
        to the Registration Statement, including any amendments thereto,
        and to the use of my name under the caption "Legal Matters" in
        the prospectus constituting a part thereof.       

                                           Sincerely,



                                           Seth H. Hoogasian
                                           General Counsel








                                                            EXHIBIT 23(a)


                    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  








                                                            EXHIBIT 23(b)


                    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-3, 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(c)



                          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








                                                            EXHIBIT 23(d)


                     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








                                                            EXHIBIT 23(e)


                     CONSENT OF INDEPENDENT PUBLIC AUDITORS



        We consent to the reference to our firm under the caption
        "Experts" in the Registration Statement on Form S-3 and related
        Prospectus of Thermo TerraTech Inc. for the registration of
        111,529 shares of its common stock 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



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