THERMEDICS DETECTION INC
POS AM, 1998-03-20
INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL
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        As filed with the Securities and Exchange Commission on 

        March 20, 1998                      Registration No. 333-31987
        --------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION 
                             Washington, DC  20549 
                         _______________________________
                         POST-EFFECTIVE AMENDMENT NO. 1
                             ON FORM S-3 TO FORM S-1
                             Registration Statement
                        Under the Securities Act of 1933
                        ________________________________

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

                  Massachusetts                     04-3106698
         (State or other jurisdiction of         (I.R.S. Employer
          incorporation or organization)        Identification No.)
                                 _______________

                                  220 Mill Road
                      Chelmsford, Massachusetts 01824-4178
                                 (781) 622-1000
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices) 
                                _______________ 

                            Sandra L. Lambert, Clerk 
                           Thermedics Detection Inc. 
                         c/o Thermo Electron Corporation
                                81 Wyman Street 
                                 P.O. Box 9046 
                       Waltham, Massachusetts  02254-9046 
                                 (781) 622-1000 
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                _______________ 

                                    Copy to:
                             Seth H. Hoogasian, Esq.
                                General Counsel 
                           Thermedics Detection Inc. 
                         c/o Thermo Electron Corporation
                                81 Wyman Street 
                                 P.O. Box 9046 
                       Waltham, Massachusetts  02254-9046 
                                 (781) 622-1000 
                                 _______________

        Approximate date of commencement of proposed sale to the public:
        From time to time after the effective date of this registration
        statement.
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        If the only securities being requested 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,
        check the following box. [X] 

        If this form is filed to register additional securities for an
        offering pursuant to Rule 462(b) under the Securities Act of
        1933, check the following box and list the Securities Act
        registration statement number of the earlier effective
        registration statement for the same offering. [  ] 

        If this form is a post-effective amendment filed pursuant to Rule
        462(c) under the Securities Act of 1933,  check the following box
        and list the Securities Act registration statement number of the
        earlier effective  registration statement for the same offering.
        [  ] 

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


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                   SUBJECT TO COMPLETION, DATED MARCH 19, 1998

        PROSPECTUS 
                                 643,500 Shares 

                            THERMEDICS DETECTION INC.

                                  Common Stock 

           This Prospectus relates to the resale of 643,500 shares (the
        "Shares") of Common Stock, par value $.10 per share (the "Common
        Stock"), of Thermedics Detection Inc. ("Thermedics Detection" or
        the "Company") by certain shareholders of the Company (the
        "Selling Shareholders").  The Shares may be offered from time to
        time in transactions on the American Stock Exchange, in
        negotiated transactions, through the writing of options on the
        Shares, or a combination of such methods of sale, at fixed prices
        that may be changed, at market prices prevailing at the time of
        sale, at prices related to such prevailing market prices or at
        negotiated prices.  Such transactions may be effected by the sale
        of the Shares to or through broker-dealers, and such
        broker-dealers may receive compensation in the form of discounts,
        concessions or commissions from the sellers and/or the purchasers
        of the Shares for whom such broker-dealers may act as agent or to
        whom they sell as principal, or both (which compensation to a
        particular broker-dealer might be in excess of customary
        commissions).  The Selling Shareholders and any broker-dealer who
        acts in connection with the sale of Shares hereunder may be
        deemed to be "underwriters" as that term is defined in the
        Securities Act of 1933, as amended (the "Securities Act"), and
        any commission 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 sold by the Company in private placements pursuant to
        certain Stock Purchase Agreements with the Company dated March
        26, 1996 and November 19, 1996.  See "Selling Shareholders."
                                _______________

        The Common Stock offered hereby involves a high degree of risk. 
                         See "RISK FACTORS" at page 5. 
                                _______________ 

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



           None of the proceeds from the sale of the Shares by the
        Selling Shareholders will be received by the Company.  The
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        Company has agreed to bear all expenses (other than underwriting
        discounts and selling commissions, and fees and expenses of
        counsel or other advisers to the Selling Shareholders) in
        connection with the registration and sale of the Shares being
        registered hereby.  The Company has agreed to indemnify the
        Selling Shareholders against certain liabilities, including
        liabilities under the Securities Act as underwriter or otherwise.

           The Company is a majority-owned subsidiary of Thermedics Inc.
        ("Thermedics"), which is a majority-owned subsidiary of Thermo
        Electron Corporation ("Thermo Electron").  The Common Stock is
        traded on the American Stock Exchange under the symbol "TDX".  On
        March 19, 1998, the reported closing price of the Common Stock on
        the American Stock Exchange was $11.50 per share.


                 The date of this Prospectus is March __, 1998.

                                _________________


           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.  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.

                                  _____________

















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                              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
        Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 at
        prescribed rates.  The Commission also maintains a Web site that
        contains reports, proxy and information statements and other
        information regarding registrants that file electronically with
        the Commission, including the Company; the address of such Web
        site is http://www.sec.gov.  The Common Stock of the Company is
        listed on the American Stock Exchange, and the reports, proxy
        statements and other information filed by the Company with the
        Commission can be inspected at the offices of the American Stock
        Exchange, 86 Trinity Place, New York, New York  10006.

           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 certain exhibits to such
        documents).  Requests for such copies should be directed to:
        Sandra L. Lambert, Clerk, Thermedics Detection Inc., c/o Thermo
        Electron Corporation, 81 Wyman Street, P. O. Box 9046, Waltham,
        Massachusetts 02254-9046 (telephone: (781) 622-1000).









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                                   THE COMPANY

           The Company develops, manufactures and markets high-speed
        detection and measurement systems used in on-line industrial
        process applications, security applications, and laboratory
        analysis.  The Company's industrial process systems use
        ultratrace chemical detectors, high-speed gas chromatography,
        X-ray imaging, near-infrared spectroscopy, and other technologies
        for quality assurance of in-process and finished products,
        primarily in the food, beverage, pharmaceutical, forest products,
        chemical, and other consumer products industries.  The Company's
        security instruments use simultaneous trace particle- and
        vapor-detection techniques based on its proprietary
        chemiluminescence and high-speed gas chromatography technologies.
        Customers use the Company's security instruments to detect
        plastic and other explosives at airports and border crossings,
        for other high-security screening applications, and for forensics
        and search applications.

           The Company operated as a division of Thermedics until its
        incorporation as a Massachusetts corporation in December 1990.
        Unless the context otherwise requires, references in this
        Prospectus to the Company refer to Thermedics Detection Inc. and
        its subsidiaries and their predecessors.  As of January 3, 1998,
        Thermedics beneficially owned 76% of the Company's outstanding
        Common Stock.  The Company's principal executive offices are
        located at 220 Mill Road, Chelmsford, Massachusetts 01824-4178,
        and its telephone number is (978) 251-2000.


























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                                  RISK FACTORS

           In connection with the "safe harbor" provisions of the
        Private Securities Litigation Reform Act of 1995, the Company
        wishes to caution readers that the following important factors,
        among others, in some cases have affected, and in the future
        could affect, the Company's actual results and could cause its
        actual results in 1998 and beyond to differ materially from those
        expressed in any forward-looking statements made by, or on behalf
        of, the Company.

            Uncertainty of Market Acceptance of New Products. Certain of
            -------------------------------------------------
        the Company's products represent alternatives to traditional
        detection and analytical methods. As a result, such products may
        be slow to achieve, or may not achieve, market acceptance, as
        customers may seek further validation of the efficiency and
        efficacy of the Company's technology, particularly where the
        purchase of the product requires a significant capital
        commitment. The Company believes that, to a significant extent,
        its growth prospects depend on its ability to gain acceptance of
        the efficiency and efficacy of the Company's innovative
        technologies by a broader group of customers. The Company is
        currently devoting significant resources toward the enhancement
        of its existing products and the development of new products and
        technologies, including its derivative products of the Company's
        Flash-GC high-speed gas chromatography system; a more portable
        EGIS system; and Rampart, a lower-cost EGIS unit for use in
        airport screening of carry-on baggage. There can be no assurance
        that the Company will be successful in obtaining such broad
        acceptance or that, if obtained, such acceptance will be
        sustained. The failure of the Company to obtain and sustain such
        broad acceptance could have a material adverse effect on the
        Company's business, financial condition and results of
        operations. 

            Ongoing Product Development Efforts Required by Rapid
            -----------------------------------------------------
        Technological Change. The markets for the Company's products are
        ---------------------
        characterized by changing technology, evolving industry standards
        and new product introductions. The Company's future success will
        depend in part upon its ability to enhance its existing products
        and to develop and introduce new products and technologies to
        meet changing customer requirements. There can be no assurance
        that the Company will successfully complete the enhancement and
        development of these products in a timely fashion or that the
        Company's current or future products will satisfy the needs of
        its markets.
            Dependence of Security Instruments Market on Government
            -------------------------------------------------------
        Regulation and Airline Industry. The Company's sales of its
        --------------------------------
        explosives-detection systems for use in airports has been and
        will continue to be dependent on governmental initiatives to
        require, or support, the screening of checked luggage, carry-on
        items and personnel with advanced explosives-detection equipment.


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        Substantially all of such systems have been installed at airports
        in countries other than the United States, in which the
        applicable government or regulatory authority overseeing the
        operations of the airport has mandated such screening. Such
        mandates are influenced by many factors outside of the control of
        the Company, including political and budgetary concerns of
        governments, airlines, and airports.

            Of the more than 600 commercial airports worldwide, more than
        400 are located in the United States. Accordingly, the Company
        believes that the size of the market for explosives-detection
        equipment is, and will increasingly be, significantly influenced
        by United States government regulation. In the United States, the
        Aviation Security Act of 1990 directed the Federal Aviation
        Administration (the "FAA") to develop a standard for
        explosives-detection systems and required airports in the United
        States to deploy systems meeting this standard in 1993. To date,
        no system has demonstrated that it meets all FAA standards under
        realistic airport operating conditions. As a result, the FAA has
        not mandated the installation of automated explosives-detection
        systems, and only a limited number of these systems have been
        deployed in the United States. The FAA first certified a computed
        X-ray tomography system for checked luggage in December 1994. The
        Company's systems are trace detectors for which no FAA
        certification process for checked baggage, carry-on, or personal
        screening exists to date. Currently, the Company is seeking FAA
        approval for the Company's EGIS and Rampart systems for use by
        airlines in screening carry-on electronic items and luggage
        searches, however, there can be no assurance that such FAA
        approvals will be obtained. Each airline must seek this approval
        for each application. Although the FAA has provided significant
        funding to the Company in connection with the development of its
        explosives-detection technology, there can be no assurance that
        any of the Company's systems will ever meet this or any other
        United States certification standard. Any product utilizing a
        technology ultimately recommended or required by the FAA will
        have a significant competitive advantage in the market for
        explosives-detection devices. Unless the FAA takes action with
        respect to a particular explosives-detection product or
        technology, airlines will not be required to purchase or upgrade
        their security systems, including upgrading existing
        metal-detection equipment. Earnings of U.S. air carriers tends to
        fluctuate significantly from time to time. Any depression in the
        financial condition of such carriers would likely result in lower
        capital spending for discretionary items. Moreover, there can be
        no assurance that additional countries will mandate the
        implementation of effective explosives screening for airline
        baggage, carry-on items or personal, or that, if mandated, the
        Company's systems will meet the certification or other
        requirements of the applicable government authority. Even if the
        Company's systems were to meet the applicable requirements, there
        can be no assurance that the Company would be able to market its
        systems effectively.


                                        6
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            In October 1996, the United States enacted legislation which
        includes a $144.2 million allocation to purchase
        explosives-detection systems and other advanced security
        equipment, including trace detection equipment such as the
        systems manufactured by the Company, for carry-on and checked
        baggage screening. The FAA has made purchases of, or placed
        orders for the purchase of, security equipment under this
        legislation, including an order to purchase $5.8 million of the
        Company's EGIS systems. There can be no assurance, however, that
        this legislation will not be modified to reduce the funding for
        advanced explosives equipment, that the necessary appropriations
        will be made to fund further purchases of advanced
        explosives-detection equipment contemplated by the legislation,
        that trace-detection equipment such as the systems manufactured
        by the Company will be mandated, or that, even if further
        appropriations are made and such equipment is mandated, any of
        the Company's explosives-detection systems will be purchased for
        installation at any airports in the United States. Further, there
        can be no assurance that the U.S. will mandate the widespread use
        of these systems after completion of the initial purchases.

            Significance of Certain Customers. Sales of process detection
            ----------------------------------
        instruments and services to bottlers licensed by The Coca-Cola
        Company ("Coca-Cola Bottlers") were $13,939,000, $10,641,000, and
        $9,974,000, in 1997, 1996, and 1995, respectively, or 27%, 24%,
        and 36% of the Company's revenues, respectively, during such
        periods. In 1997, the Company completed the fulfillment of a
        mandated product-line upgrade for the Coca-Cola Bottlers.
        Although the Company anticipates that it will continue to derive
        revenues from the sale of upgrades and new systems to new plants,
        as well as services to the Coca-Cola Bottlers, the Company does
        not expect that revenues derived from these customers will
        continue at a rate comparable to prior years. Further, the
        Company intends to continue to develop and introduce new process
        detection products for the food, beverage and other markets,
        however, there can be no assurance that the Company will be
        successful in the introduction of new process detection products
        or that any sales of these products will be sufficient to
        maintain a rate of growth equivalent to prior years. 

            Competition; Technological Change. The Company encounters,
            ----------------------------------
        and expects to continue to encounter, competition in the sale of
        its current and future products. Many of the Company's
        competitors and potential competitors have substantially greater
        resources, manufacturing and marketing capabilities, research and
        development staff and production facilities than those of the
        Company. Some of these competitors have large existing installed
        bases of products with substantial numbers of customers. In
        addition, other major corporations have recently announced their
        intention to enter certain of the Company's markets, including
        the security screening market. The Company believes that many of
        its products are successful because they are technologically
        superior to alternative products offered by some of the Company's
        competitors. In order to continue to be successful, the Company

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        believes that it will be important to maintain this technological
        advantage. No assurance can be given that the Company will be
        able to maintain such an advantage or that competitors of the
        Company will not develop technological innovations that will
        render products of the Company obsolete. For example, the
        Company's EGIS system competes against other trace explosives
        detection systems as well as systems utilizing dual energy X-ray
        or computed X-ray tomography imaging technologies. There can be
        no assurance that such technologies will not be enhanced to a
        degree that would impair the Company's ability to market its
        explosives detection systems. 

            Potential for Product Liability Claims. The Company's
            ---------------------------------------
        business involves the risk of product liability claims inherent
        to the explosives detection business, as well as the food,
        beverage and other industries. There are many factors beyond the
        control of the Company that could result in the failure of the
        Company's products to detect explosives or contaminants in food
        or beverage containers, such as the reliability of a customer's
        operators, the ongoing training of such operators and the
        maintenance of the Company's products by its customers. For these
        and other reasons, there can be no assurance that the Company's
        products will detect all explosives or contaminants. The failure
        to detect explosives or contaminants could give rise to product
        liability claims and result in negative publicity that could have
        a material adverse effect on the Company's business, financial
        condition and results of operations. The Company currently
        maintains both aviation and general product liability insurance
        in amounts the Company believes to be commercially reasonable.
        There can be no assurance that this insurance will be sufficient
        to protect the Company from product liability claims, or that
        product liability insurance will continue to be available to the
        Company at a reasonable cost, if at all. 

            Uncertainties Associated With International Operations. In
            -------------------------------------------------------
        1997, 1996, and 1995, international sales accounted for 71%, 67%,
        and 73%, respectively, of the Company's revenues, and the Company
        anticipates that international sales will continue to account for
        a significant percentage of the Company's revenues. Sales to
        customers in The Netherlands accounted for approximately 17% and
        11% of the Company's revenues in 1997 and 1996, respectively.
        International revenues are subject to a number of uncertainties,
        including the following: agreements may be difficult to enforce
        and receivables difficult to collect through a foreign country's
        legal system; foreign customers may have longer payment cycles;
        foreign countries may impose additional withholding taxes or
        otherwise tax the Company's foreign income, impose tariffs or
        adopt other restrictions on foreign trade; fluctuations in
        exchange rates may affect product demand and adversely affect the
        profitability in U.S. dollars of products and services provided
        by the Company in foreign markets where payment for the Company's
        products and services is made in the local currency; U.S. export
        licenses may be difficult to obtain; and the protection of
        intellectual property in foreign countries may be more difficult

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        to enforce. Moreover, many foreign countries have their own
        regulatory approval requirements for sales of the Company's
        products. As a result, the Company's introduction of new products
        into international markets can be costly and time-consuming, and
        there can be no assurance that the Company will be able to obtain
        the required regulatory approvals on a timely basis, if at all.
        There can be no assurance that any of these factors will not have
        a material adverse effect on the Company's business, financial
        condition and results of operations. The Company does not attempt
        to minimize currency and exchange rate risks through material
        hedging activities. 

            Limited Protection of Proprietary Technology and Risks of
            ---------------------------------------------------------
        Third-Party Claims. Proprietary rights relating to the Company's
        -------------------
        products will be protected from unauthorized use by third parties
        only to the extent that they are covered by valid and enforceable
        patents or are maintained in confidence as trade secrets. There
        can be no assurance, however, that any patents now or hereafter
        owned by the Company will afford protection against competitors,
        or as to the likelihood that patents will issue from pending
        patent applications. Proceedings initiated by the Company to
        protect its proprietary rights could result in substantial costs
        to the Company. Although the Company believes that its products
        and technology do not infringe any existing proprietary rights of
        others, there can be no assurance that third parties will not
        assert such claims against the Company in the future or that such
        future claims will not be successful. The Company could incur
        substantial costs and diversion of management resources in
        connection with the defense of any claims relating to proprietary
        rights, which could have a material adverse effect on the
        Company's business, financial condition, and results of
        operations. Furthermore, parties making such claims could secure
        a judgment awarding substantial damages, as well as injunctive or
        other equitable relief, which could effectively block the
        Company's ability to make, use, sell, distribute or market its
        products and services in the U.S. or abroad. Such a judgment
        could have a material adverse effect on the Company's business,
        financial condition and results of operations. In the event that
        a claim relating to proprietary technology or information is
        asserted against the Company, the Company may seek licenses to
        such intellectual property. There can be no assurance, however,
        that such a license could be obtained on commercially reasonable
        terms, if at all, or that the terms of any offered licenses will
        be acceptable to the Company. The failure to obtain the necessary
        licenses or other rights could preclude the sale, manufacture or
        distribution of the Company's products and, therefore, could have
        a material adverse effect on the Company's business, financial
        condition and results of operations. The cost of responding to
        any such claim may be material, whether or not the assertion of
        such claim is valid. There can be no assurance that the steps
        taken by the Company to protect its proprietary rights will be
        adequate to prevent misappropriation of its technology or
        independent development by others of similar technology. In
        addition, the laws of some jurisdictions do not protect the

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        Company's proprietary rights to the same extent as the laws of
        the U.S. There can be no assurance that these protections will be
        adequate.

            Risks Associated with Acquisition Strategy. The Company's
            -------------------------------------------
        strategy includes the acquisition of businesses and technologies
        that complement or augment the Company's existing product lines.
        Promising acquisitions are difficult to identify and complete for
        a number of reasons, including competition among prospective
        buyers and the need for regulatory approvals, including antitrust
        approvals. Any acquisitions completed by the Company may be made
        at substantial premiums over the fair value of the net assets of
        the acquired companies. There can be no assurance that the
        Company will be able to complete future acquisitions or that the
        Company will be able to successfully integrate any acquired
        businesses. In order to finance such acquisitions, it may be
        necessary for the Company to raise additional funds through
        public or private financings. Any equity or debt financing, if
        available at all, may be on terms which are not favorable to the
        Company and, in the case of equity financing, may result in
        dilution to the Company's stockholders.

            Difficulties in Managing Rapid Growth. Due to the level of
            --------------------------------------
        technical and marketing expertise necessary to support its
        existing and new customers, the Company must attract and retain
        highly qualified and well-trained personnel. There are a limited
        number of persons with the requisite skills to serve in these
        positions, and it may become increasingly difficult for the
        Company to hire such personnel. Further rapid expansion may also
        significantly strain the Company's administrative, operational
        and financial personnel, management information systems,
        manufacturing operations, and other resources. There can be no
        assurance that the Company's systems, procedures, and controls
        will be adequate to support the Company's operations. Failure to
        manage growth properly could have a material adverse effect on
        the Company's business, financial condition, and results of
        operations. 

            Potential Fluctuations in Quarterly Performance. Significant
            ------------------------------------------------
        annual and quarterly fluctuations in the Company's results of
        operations may be caused by, among other factors, the overall
        demand for, and market acceptance of, the Company's products; the
        timing of regulatory approvals for certain of the Company's
        products; government initiatives to promote the use of explosives
        detection systems such as those manufactured and sold by the
        Company; the timing of the announcement, introduction and
        delivery of new products and product enhancements by the Company
        and its competitors; variations in the Company's product mix and
        component costs; timing of customer orders; adjustments of
        delivery schedules to accommodate customers' programs; the
        availability of components from suppliers; the timing and level
        of expenditures in anticipation of future sales; the mix of
        products sold by the Company; and pricing and other competitive
        conditions. Because certain of the Company's products require

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        significant capital expenditures and other commitments by its
        customers, the Company has experienced extended sales cycles.
        Delays in anticipated purchase orders could have a material
        adverse effect on the Company's business, financial condition and
        results of operations. Customers may also cancel or reschedule
        shipments, and product difficulties could delay shipments.
        Because the Company's operating expenses are based on anticipated
        revenue levels and a high percentage of the Company's expenses
        are fixed for the short term, a small variation in the timing of
        recognition of revenue can cause significant variations in
        operating results from quarter to quarter. There can be no
        assurance that any of these factors will not have a material
        adverse impact on the Company's business and results of
        operations. 

            Potential Impact of Year 2000 on Processing of Date-sensitive
            -------------------------------------------------------------
        Information. The Company is currently assessing the potential
        ------------
        impact of the year 2000 on the processing of date-sensitive
        information by the Company's computerized information systems and
        on products sold as well as products purchased by the Company.
        The Company believes that its internal information systems and
        current products are either year 2000 compliant or will be so
        prior to the year 2000 without incurring material costs. There
        can be no assurance, however, that the Company will not
        experience unexpected costs and delays in achieving year 2000
        compliance for its internal information systems and current
        products, which could result in a material adverse effect on the
        Company's future results of operations.

          The Company is presently assessing the effect that the year
        2000 problem may have on its previously sold products. The
        Company is also assessing whether its key suppliers are
        adequately addressing this issue and the effect this might have
        on the Company. The Company has not completed its analysis and is
        unable to conclude at this time that the year 2000 problem as it
        relates to its previously sold products and products purchased
        from key suppliers is not reasonably likely to have a material
        adverse effect on the Company's future results of operations.











                              SELLING SHAREHOLDERS

           The following table shows the names of the Selling
        Shareholders, the number of Shares that may be offered by each of


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        them pursuant to this Prospectus and the number of Shares each
        will own after completion of the offering, assuming all of the
        Shares being offered hereby are sold.


                                    Shares of                 Shares
                                   Common Stock             Owned after
                                   Owned Prior              Completion
                                      to the      Shares      of the
                                   Offering(1)     Being     Offering
                                   -----------               --------
            Selling Shareholder                   Offered
            -------------------                   -------


         Craig Drill Capital L.P.    80,000      80,000         0
         Awad & Associates L.P.      5,000        5,000         0
         Richard B. Felder           5,000        5,000         0

         Richard B. Felder c/f       2,500        2,500         0
         Jeffrey D. Felder
         Richard B. Felder c/f       2,500        2,500         0
         Jonathan D. Felder
         Mark Cahill                 2,500        2,500         0

         Georgia Veru                2,500        2,500         0
         Michael D. Mintz Trust      11,500      10,000       1,500
         u/a 8/12/92
         Martin Walsh                10,000      10,000         0

         Crescent International      50,000      50,000         0

         David H. Fine(3)           101,667      10,000      91,667
         Bear Stearns                80,000      80,000         0
         Universal Partners, L.P.    10,000      10,000         0

         Alan J. Rubin               10,000      10,000         0
         Rush & Co.                  55,000      55,000         0
         Hartley Bernstein           5,000        5,000         0

         William C. Bartholomay      10,000      10,000         0
         Paul A. Berkman & Judith    5,000        5,000         0
         M. Berkman, JTWROS
         Richard J. & Christine S.   5,000        5,000         0
         Cowgill

         Harvey Greenfield           5,000        5,000         0
         James W. Jacobs             10,000      10,000         0
         Ronald M. Krinick           10,000      10,000         0

         Jeffrey J. Langan(4)       113,660      10,000      103,660
         Nadia One, Inc.             10,000      10,000         0
         WNC Corporation             50,000      50,000         0




                                       12
PAGE
<PAGE>





         Pilot Trading Trust         9,000        9,000         0
         Dr. Martin R. Post MD PC    2,500        2,500         0
         Retirement Trust dtd
         9/1/84

         Edward Raskin, Ttee FBO     5,000        5,000         0
         Edward Raskin u/a/d
         10/14/94
         Jiela Rufeh                 2,500        2,500         0
         Bejan Rufeh                 2,500        2,500         0

         Seema Sachdeva & Rakesh     5,000        5,000         0
         Sachdeva
         Michael & Dafna Schmerin    2,500        2,500         0
         Joel Schoenfeld             2,500        2,500         0


         Allenstown Investment       10,000      10,000         0
         Partners
         Carico, Inc.                5,000        5,000         0
         Martin D. Cohn and Gerald   25,000      25,000         0
         L. Cohn, Trustees for
         Gerald L. Cohn

         Hannah S. and Samuel A.     5,000        5,000         0
         Cohn Memorial Foundation
         Cynthia J. Cohn Revocable   5,000        5,000         0
         Trust
         Ekistics Corp.              10,000      10,000         0


         M.D. Funding, Inc.          10,000      10,000         0
         Mid-Lakes Profit Sharing    10,000      10,000         0
         Trust
         Bruce E. Toll               20,000      20,000         0

         Tracy M. Cirillo(5)         1,000        1,000         0
         Francis X. O'Brien          1,366        1,000        366
         Total                      840,693      643,500     197,193



        (1)Except as otherwise reflected in the footnotes to this table,
           all share ownership includes Shares owned by the Selling
           Shareholders and shares that the Selling Shareholders had the
           right to acquire within 60 days of June 30, 1997, through the
           exercise of stock options.


        (2)Crescent International Holdings Limited is a wholly owned
           subsidiary of Crescent Holding GmbH, which is indirectly
           controlled by Suliman S. Olayan, the father of Hutham S.
           Olayan, a director of Thermo Electron.  Ms. Olayan disclaims


                                       13
PAGE
<PAGE>





           beneficial ownership of the Shares owned by Crescent
           International Holdings Limited.

        (3)Dr. Fine is Senior Vice President of the Company.

        (4)Mr. Langan was, until November 1997, Chief Executive Officer,
           President and a Director of the Company.

        (5) Ms. Cirillo is an employee of the Company.

           The Shares are being registered to permit public secondary
        trading of the Shares from time to time by the Selling
        Shareholders.  All of the Shares being offered by the Selling
        Shareholders were sold by the Company in private placement
        transactions pursuant to Stock Purchase Agreements with the
        Company dated March 26, 1996 and November 19, 1996  
        (collectively, the "Purchase Agreements") for cash.

           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 Shareholders) in connection with the
        registration and sale of the Shares being offered by the Selling
        Shareholders. See "Sale of Shares."  The Company intends 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) 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 Shareholders.


                                 SALE OF SHARES

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


                                       14
PAGE
<PAGE>





        may arrange for others to participate in any such transaction and
        may receive compensation in the form of discounts, commissions or
        concessions from the Selling Shareholders and/or the purchasers
        of the Shares.  Each Selling Shareholder will be responsible for
        payment of any and all commissions to brokers.

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

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

           Any Selling Shareholder and any broker-dealer, agent or
        underwriter who acts in connection with the sale of Shares
        hereunder may be deemed to be an "underwriter" 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
        Shareholders 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
        by the Company (File No. 1-12745) are hereby incorporated in this
        Prospectus by reference:

             (a)  Annual Report on Form 10-K for the fiscal year ended
                  January 3, 1998; and

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

             All documents 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 into this Prospectus and to be a part hereof from the
        respective dates of filing of such documents.  Any statement
        contained herein or in a document all or any portion of which is
        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 which also is or is deemed
        to be incorporated by reference herein modifies or supersedes

                                       15
PAGE
<PAGE>





        such earlier statement.  Any statement so modified or superseded
        shall not be deemed, except as so modified or superseded, to
        constitute a part of this Prospectus.  

             The Company will provide without charge to any person to
        whom this Prospectus is delivered, upon the written or oral
        request of such person, a copy of any or all of the foregoing
        documents incorporated herein by reference (other than certain
        exhibits to such documents).  Requests for such copies should be
        directed to Sandra L. Lambert, Clerk, Thermedics Detection Inc.,
        c/o Thermo Electron Corporation, 81 Wyman Street, P.O. Box 9046,
        Waltham, Massachusetts 02254-9046 (telephone: (781) 622-1000).


                                  LEGAL MATTERS

           Certain legal matters relating to the Shares offered hereby
        have been passed upon for the Company by Seth H. Hoogasian, Esq.,
        General Counsel of Thermo Electron, Thermedics and the Company.
        As of the date of such opinion, Mr. Hoogasian owned or had the
        right to acquire 5,000 shares of Common Stock, 8,900 shares of
        common stock of Thermedics and 105,558 shares of common stock of
        Thermo Electron. 


                                    EXPERTS

          The Consolidated Financial Statements  of the Company  (except
        the Consolidated Financial Statements of Rutter & Co. B.V. as  of
        January 3, 1998  and December  28, 1996  and for  the year  ended
        January 3, 1998 and for the period from January 25, 1996 (date of
        acquisition) to December  28, 1996), and  the related financial
        statement schedule incorporated by reference in the Registration
        Statement of which this prospectus forms a part have been audited
        by Arthur Andersen LLP, independent public  accountants, as set 
        forth in their reports.  In those reports, that firm states that
        with respect to certain subsidiaries its opinion is based on the
        report of other independent public accountants, namely Deloitte
        & Touche.  The financial statements and supporting schedule referred
        to above have been included herein in reliance upon the authority
        of those firms as experts in giving said reports.

          The Consolidated Financial Statements of Rutter & Co.  B.V. as
        of January 3, 1998 and December  28, 1996 and for the year  ended
        January 3,  1998 and  for the  period from  January 25,  1996  to
        December 28,  1996  have  been  audited  by  Deloitte  &  Touche,
        independent auditors and registeraccountants, as stated in  their
        report included herein and are included in reliance upon the report
        of such firm given upon their authority as experts in accountng and
        auditing.

                                       16
PAGE
<PAGE>







                                     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         2,286
           Commission ...................................

           Legal fees and expenses ......................     5,000
           Accounting fees and expenses .................     5,000
           Printing and engraving expenses                   15,000

           Miscellaneous ................................     2,000
                Total ...................................    29,286

             Item 15.  Indemnification of Directors and Officers.

             The Massachusetts Business Corporation Law and the Company's
        Articles of Organization 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
        Company's Articles of Organization, By-laws and form of
        Indemnification Agreement for Officers and Directors incorporated
        by reference

             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 Shareholders are obligated under the Purchase
        Agreements to indemnify directors, officers and controlling
        persons of the Registrant against certain liabilities, including
        liabilities under the Securities Act.




                                       17
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 as
        follows:

                   (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 a 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 information
                       required to be included in a post-effective
                       amendment by those paragraphs is contained in
                       periodic reports filed with or furnished to the
                       Commission by the Registrant pursuant to Section
                       13 or Section 15(d) of the Securities Exchange Act

                                       18
PAGE
<PAGE>





                       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.

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








                                       19
PAGE
<PAGE>




                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of 1933,
        the Registrant has duly caused this Post-Effective Amendment No.
        1 on Form S-3 to Registration Statement on Form S-1 to be signed
        on its behalf by the undersigned, thereunto duly authorized, in
        the City of Waltham, Commonwealth of Massachusetts, on this 20th
        day of March, 1998.

                                           THERMEDICS DETECTION INC.

                                           By:  /s/James Barbookles
                                               --------------------
s/James Barbookles
                  --                                               --
                                                James Barbookles
                                                President and Chief
                                                Executive Officer

             Pursuant to the requirements of the Securities Act of 1933,
        this Post-Effective Amendment No. 1 on Form S-3 to Registration
        Statement on Form S-1 has been signed by the following persons in
        the capacities and on the dates indicated.

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

        /s/ James Barbookles        President, Chief   March 19, 1998
        -------------------------
        James Barbookles            Executive Officer 
                                    and Director (Principal
                                    Executive Officer)

        John N. Hatsopoulos*        Chief Financial    March 19, 1998
        -------------------------
        John N. Hatsopoulos         Officer, Senior Vice President
                                    and Director
                                    (Principal Financial Officer)

        Paul F. Kelleher*           Chief Accounting   March 19, 1998
        -------------------------
        Paul F. Kelleher            Officer (Principal 
                                    Accounting Officer)

        John W. Wood Jr.*           Chairman of the    March 19, 1998
        ------------------------
        John W. Wood Jr.            Board and Director          


                                    Director           March   , 1998
        -------------------------                            --
        Morton Collins

                                    Director           March   , 1998
        -------------------------                            --
        Matthew C. Weisman












                                       20
PAGE
<PAGE>





        *    The undersigned Sandra L. Lambert, by signing her name
        hereto, does hereby execute this Post-Effective Amendment No. 1
        on Form S-3 to Registration Statement on Form S-1 on behalf of
        each of the above-named persons pursuant to powers of attorney
        executed by such persons and filed with the Securities and
        Exchange Commission.

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













































                                       21
PAGE
<PAGE>






                                  EXHIBIT INDEX


         Exhibit                  Description of Exhibit
         -------                  ----------------------
           No.
           ---
           4.1    Specimen Common Stock Certificate (filed as Exhibit
                  4.1 to the Registrant's Registration Statement on
                  Form S-1 [Registration No. 333-19199]  and
                  incorporated herein by reference).

           5      Opinion of Seth H. Hoogasian, Esq. (previously
                  filed)
           23.1   Consent of Arthur Andersen LLP
           23.2   Consent of Deloitte & Touche Registeraccountants

           23.3   Exhibit 5) Seth H. Hoogasian, Esq. (contained in

           24     Power of Attorney (previously filed)




        AA980760020































                                       23
PAGE
<PAGE>





                                                             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
        reports dated February 12, 1998, included in or incorporated by
        reference in Thermedics Detection Inc.'s Form 10-K for the year
        ended January 3, 1998 and all references to our Firm included in
        this Registration Statement.


                                                Arthur Andersen LLP



        Boston, Massachusetts
        March 13, 1998





































                                       24
PAGE
<PAGE>





                                                             Exhibit 23.2


                          Independent Auditors' Consent
                          -----------------------------


            We consent to the use in this registration statement of
        Thermedics Detection Inc. on Form S-1, as amended on March 19,
        1998, of our report dated February 6, 1998, appearing in this
        prospectus, which relates to the financial statements of Rutter &
        Co. B.V. (which have not separately been included herein).

            We also consent to the reference to us under the heading
        "Experts" in such prospectus.


        Deloitte & Touche Registeraccountants


        Almelo, The Netherlands
        March 19, 1998





































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