SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C.  20549

                   ___________________________________________


                                    FORM 8-K

                                 CURRENT REPORT



                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934



                                 Date of Report
                       (Date of earliest event reported):

                                December 1, 1995

                    ________________________________________


                                 THERMEDICS INC.
             (Exact name of Registrant as specified in its charter)


   Massachusetts                   1-9567                           04-2788806
   (State or other               (Commission                  (I.R.S. Employer
   jurisdiction of               File Number)           Identification Number)
   incorporation or
   organization)

                                         

   470 Wildwood Street
   P. O. Box 2999
   Woburn, Massachusetts                                            01888-1799
   (Address of principal executive offices)                         (Zip Code)



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





   Item 2.  Acquisition or Disposition of Assets
            ------------------------------------

        On December 1, 1995, Thermedics Inc. (the "Company") acquired all of
   the outstanding capital stock of Analytical Technology, Inc. ("ATI")
   pursuant to a merger (the "Merger").

        In a separate transaction consummated immediately prior to the
   effectiveness of the Merger, Thermo Instrument Systems Inc., which is an
   affiliate of the Company ("Thermo Instrument"), purchased ATI's analytical
   instruments business (the "Thermo Instrument Acquisition") in exchange for
   Thermo Instrument's demand promissory note in the principal amount of
   $34,933,000 (the "Thermo Instrument Note").  Consequently, at the effective
   time of the Merger, ATI's assets consisted principally of its Orion
   Laboratory Products Division ("Orion") and the Thermo Instrument Note.
   Orion, based in Boston, Massachusetts, is a provider of electrochemistry,
   microweighing and other instruments to detect the chemical composition of
   foods, beverages and pharmaceuticals.  

        The base purchase price of the capital stock of ATI acquired in the
   Merger (the "Aggregate Purchase Price") was $79,284,183 in cash, plus the
   assumption of approximately $15,600,000 in bank indebtedness existing as of
   the closing of the Merger.  Of these amounts, $34,933,000 was paid to the
   former ATI shareholders by Thermo Instrument at the direction of the
   Company in exchange for the cancellation of the Thermo Instrument Note, and
   Thermo Instrument assumed approximately $7,000,000 of such bank
   indebtedness.  As a result, the effective base purchase price paid by the
   Company for Orion (the "Orion Purchase Price") was $44,351,000 in cash plus
   assumed bank indebtedness of approximately $8,600,000.

        The Aggregate Purchase Price is subject to a post-closing adjustment,
   and will either be (i) increased by the amount by which ATI's net tangible
   equity as of the closing (without taking into account the Thermo Instrument
   Acquisition) exceeds a deficit of $1,989,000; or (ii) decreased by the
   amount by which a deficit of $1,989,000 exceeds such net tangible equity.
   The Company and Thermo Instrument have agreed that, in the event that the
   Aggregate Purchase Price is so adjusted, then the portion of such
   adjustment that is attributable to the operations of the businesses
   acquired by Thermo Instrument will be paid to, or by, Thermo Instrument, as
   the case may be.

        The Merger was effected pursuant to an Agreement and Plan of Merger
   executed November 29, 1995, by and among the Company, ATI Merger Corp. (a
   wholly owned subsidiary of the Company), ATI and, for certain limited
   purposes, Thermo Instrument.  The Orion Purchase Price was based on the
   Company's determination of the fair market value of Orion's business, and
   the terms of the merger agreement were determined by arms' length
   negotiation among the parties.

        The Company may seek to move Orion's headquarters and certain of its
   manufacturing operations upon the expiration of certain lease commitments.
   Otherwise, the Company has no present intention to use Orion's plant,
   equipment or other assets for purposes materially different from the
   purposes for which such assets were used prior to the acquisition.
   However, the Company will review Orion's business and assets, corporate
   structure, capitalization, operations, properties, policies, management and
   personnel and, upon completion of this review, may develop alternative
   plans or proposals, including mergers, transfers of a material amount of
   assets or other transactions or changes relating to such business.

                                        2
PAGE






        Orion had revenues of approximately $46,000,000 for the fiscal year
   ended December 31, 1994.

        Of the Orion Purchase Price, $38,000,000 was borrowed from Thermo
   Electron Corporation pursuant to a promissory note due December 9, 1996 and
   bearing interest at a rate per annum equal to the rate of the Commercial
   Paper Composite Rate as reported by Merrill Lynch Capital Markets, as an
   average of the last five business days of each fiscal quarter, plus 25
   basis points, and the balance was funded from the Company's working
   capital.

   Item 7.  Financial Statements, Pro Forma Combined Condensed Financial
            Information and Exhibits

            (a) Financial Statements of Business Acquired: as it is
                impracticable to file such information at this time, it will
                be filed by amendment on or prior to February 14, 1996.

            (b) Pro Forma Combined Condensed Financial Information: as it is
                impracticable to file such information at this time, it will
                be filed by amendment on or prior to February 14, 1996.

            (c) Exhibits

                2     Agreement and Plan of Merger dated as of the 29th day
                      of November 1995, by and among Thermedics Inc., ATI
                      Merger Corp., Analytical Technology, Inc., and, for
                      certain limited purposes, Thermo Instrument Systems
                      Inc.  Schedules and exhibits to the agreement (each of
                      which are identified in the agreement) are omitted in
                      reliance on Rule 601(b)(2) of Regulation S-K.  The
                      registrant hereby undertakes to furnish such schedules
                      and exhibits to the Commission supplementally upon
                      request.

                10(a) Asset and Share Purchase Agreement dated as of the 29th
                      day of November 1995, by and among Thermo Instrument
                      Systems Inc., ATI Acquisition Corp., Analytical
                      Technology, Inc., and, for certain limited purposes,
                      Thermedics Inc.  Schedules and exhibits to the
                      agreement (each of which are identified in the
                      agreement) are omitted in reliance on Rule 601(b)(2) of
                      Regulation S-K.  The registrant hereby undertakes to
                      furnish such schedules and exhibits to the Commission
                      supplementally upon request.

                10(b) $38,000,000 Promissory Note dated as of December 11,
                      1995 issued by Thermedics Inc. to Thermo Electron
                      Corporation.









                                        3
PAGE





                                  SIGNATURES


        Pursuant to the requirements of the Securities Exchange Act of 1934,
   the Registrant has duly caused this report to be signed on its behalf by
   the undersigned thereunto duly authorized, on this 12th day of December,
   1995.



                                             THERMEDICS INC.


                                             By: John W. Wood, Jr.
                                                 -------------------
                                                 John W. Wood, Jr.
                                                 President and Chief 
                                                 Executive Officer




























   AA953400026