SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                  _____________________________________________

                                    FORM 10-K
    (mark one)
    [ X ] Annual Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the fiscal year ended September 27, 1997

    [   ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934

                         Commission file number 1-10791

                             THERMOTREX CORPORATION
             (Exact name of Registrant as specified in its charter)
    Delaware                                                       52-1711436
    (State or other jurisdiction of                          (I.R.S. Employer
    incorporation or organization)                        Identification No.)

    10455 Pacific Center Court
    San Diego, California                                          92121-4339
    (Address of principal executive offices)                       (Zip Code)
       Registrant's telephone number, including area code: (781) 622-1000

           Securities registered pursuant to Section 12(b) of the Act:

            Title of each class          Name of exchange on which registered
      -------------------------------    ------------------------------------
      Common Stock, $.01 par value             American Stock Exchange
      3 1/4% Subordinated Convertible
        Debentures due 2007                    American Stock Exchange

           Securities registered pursuant to Section 12(g) of the Act:
                                      None

    Indicate by check mark whether the Registrant (1) has filed all reports
    required to be filed by Section 13 or 15(d) of the Securities Exchange
    Act of 1934 during the preceding 12 months, and (2) has been subject to
    the filing requirements for at least the past 90 days. Yes [ X ] No [  ]

    Indicate by check mark if disclosure of delinquent filers pursuant to
    Item 405 of Regulation S-K is not contained herein, and will not be
    contained, to the best of the Registrant's knowledge, in definitive proxy
    or information statements incorporated by reference into Part III of this
    Form 10-K or any amendment to this Form 10-K. [  ]

    The aggregate market value of the voting stock held by nonaffiliates of
    the Registrant as of October 31, 1997, was approximately $206,309,000.

    As of October 31, 1997, the Registrant had 19,249,204 shares of Common
    Stock outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE
    Portions of the Registrant's Annual Report to Shareholders for the fiscal
    year ended September 27, 1997, are incorporated by reference into Parts I
    and II.

    Portions of the Registrant's definitive Proxy Statement for the Annual
    Meeting of Shareholders to be held on March 5, 1998, are incorporated by
    reference into Part III.
PAGE

                                     PART I

    Item 1. Business

    (a) General Development of Business

        ThermoTrex Corporation (the Company or the Registrant) has three
    majority-owned subsidiaries, 79%-owned Trex Medical Corporation (Trex
    Medical), 67%-owned ThermoLase Corporation (ThermoLase), and 78%-owned
    Trex Communications Corporation (Trex Communications). Through its
    publicly traded Trex Medical subsidiary, the Company designs,
    manufactures, and markets mammography and minimally invasive digital
    breast-biopsy systems used for the detection of breast cancer, as well as
    general-purpose and specialized X-ray equipment. Through its publicly
    traded ThermoLase subsidiary, the Company has developed a laser-based
    system for the removal of unwanted hair (the SoftLight(SM) system), which
    is being marketed in the U.S. through ThermoLase's Spa Thira locations
    and through licensing agreements with physicians, and in foreign
    countries through joint ventures and other licensing arrangements.
    ThermoLase also manufactures and markets skin-care and other
    personal-care products. In addition, the Company performs advanced
    technology research in the areas of communications, avionics, X-ray
    detection, signal processing, and lasers. The Company's laser
    communications (lasercom) research is performed by its privately held
    Trex Communications Corporation (Trex Communications) subsidiary, which
    also designs and markets interactive information and voice-response
    systems, as well as call-automation systems.

        In October 1997, Trex Medical's XRE Corporation (XRE) subsidiary
    acquired substantially all of the assets, subject to certain liabilities,
    of Digitec Corporation, a manufacturer of physiological-monitoring
    equipment and digital-image archiving and networking systems used in
    cardiac catheterization procedures. 

        Trex Medical is currently developing a full-field digital mammography
    system that is intended to be capable of higher image quality. The system
    is designed to enhance the X-ray image through software and to allow
    near-real-time analysis. Trex Medical expects that it will be possible to
    electronically transmit these images to allow off-site analysis by
    another radiologist, and believes this technology may also provide better
    images of dense breast tissue, which is often found in younger women.
    Trex Medical has collected clinical data and, in December 1997, submitted
    a 510(k) application with such data to the U.S. Food and Drug
    Administration (FDA), which must grant market clearance before this
    system can be sold commercially.

        Trex Medical has designed its new, high-end conventional mammography
    systems so that radiologists can upgrade to digital technology when it
    becomes available. Trex Medical believes that the digital-imaging
    technology being developed for this system may be adaptable to its
    general-purpose and specialized X-ray systems, and will seek to develop
    applications in these markets. Trex Medical is also working on a more
    advanced version of its digital technology, which incorporates a
    flat-panel, direct-digital detector and could provide still more
    information for earlier diagnoses.

                                        2PAGE

        ThermoLase opened its first Spa Thira in early fiscal 1996*, and had
    a total of four opened by the end of fiscal 1996. In fiscal 1997,
    ThermoLase opened nine more domestic spas, and by October 1997 had a
    total of 14 domestic Spa Thira locations. In June 1996, ThermoLase
    initiated a program to license its SoftLight technology to physicians. As
    of November 1997, approximately 150 lasers were placed in practices in
    33 states and certain international markets. In January 1996, ThermoLase
    established its first international joint venture and, during fiscal
    1997, added two additional joint ventures and six additional licensing
    arrangements. ThermoLase's international arrangements resulted in the
    opening of spas in Paris in May 1997 and Lugano, Switzerland, in October
    1997, and additional spas are expected to be constructed during fiscal
    1998, pending regulatory approvals.

        ThermoLase continues to pursue an extensive research and development
    program to improve the efficacy and duration of its hair-removal
    treatment. ThermoLase has developed a modification to its procedure,
    called SoftLight 2.0, and began introducing this procedure in its spas
    and to its licensees in September 1997. Although the clinical laboratory
    results are encouraging, the results are preliminary and there can be no
    assurance that SoftLight 2.0 will be successful in improving the
    hair-removal process. ThermoLase believes that improvements in the
    hair-removal procedure are critical elements in its ability to improve
    the profitability of its business.

        In March 1997, ThermoLase filed with the FDA a 510(k) application
    seeking clearance to market cosmetic skin resurfacing services utilizing
    its SoftLight Rejuvenation(TM) Laser, including wrinkle- and skin-texture
    treatment. This technology, which uses the same laser as ThermoLase's
    hair-removal system, is designed to improve the skin's appearance and
    texture.

        During fiscal 1997, the Company created its Trex Communications
    subsidiary, and in September 1997 completed a private placement of
    1,133,000 shares of Trex Communications common stock for net proceeds of
    $10.6 million. Trex Communications is developing a laser communications
    (lasercom) technology, which is designed to move very large amounts of
    data quickly via lasers without the need for wires or licensing from the
    Federal Communications Commission. In July 1997, Trex Communications
    acquired Computer Communications Specialists, Inc. (CCS), which designs
    and markets interactive information and voice-response systems, as well
    as call-automation systems. 

        The Company continues to perform substantial amounts of government-
    sponsored research and development and apply its core technologies to the
    development of new commercial products, such as its passive microwave
    camera. The passive microwave camera could be used to enhance safety in


    * In September 1995, the Company changed its fiscal year end from the
      Saturday nearest December 31 to the Saturday nearest September 30.
      References to "fiscal 1997," "fiscal 1996," and "fiscal 1995" herein
      are for the years ended September 27, 1997, and September 28, 1996,
      and the nine months ended September 30, 1995, respectively.

                                        3PAGE

    aircraft navigation during low-visibility conditions and in certain
    security applications. 

        At September 27, 1997, Thermo Electron Corporation (Thermo Electron)
    owned 10,149,556 shares of the common stock of the Company, representing
    53% of such stock then outstanding. Thermo Electron is a world leader in
    environmental monitoring and analysis instruments, biomedical products
    such as heart-assist devices, papermaking and recycling equipment,
    biomass electric power generation, and other specialized products and
    technologies. Thermo Electron also provides a range of services related
    to environmental quality.

        Thermo Electron intends for the foreseeable future to maintain at
    least 50% ownership of the Company. This will require the purchase by
    Thermo Electron of additional shares of Company common stock from time to
    time as the number of outstanding shares issued by the Company increases.
    These and any other purchases may be made either in the open market or
    directly from the Company. During fiscal 1997, Thermo Electron purchased
    317,200 shares of the Company's common stock in the open market for a
    total price of $7.2 million. See Notes 5 and 15 to Consolidated Financial
    Statements in the Registrant's Fiscal 1997 Annual Report to Shareholders
    for a description of outstanding stock options and subordinated
    convertible debentures.

    Forward-looking Statements

         Forward-looking statements, within the meaning of Section 21E of
    the Securities Exchange Act of 1934, are made throughout this Annual
    Report on Form 10-K. For this purpose, any statements contained herein
    that are not statements of historical fact may be deemed to be
    forward-looking statements. Without limiting the foregoing, the words
    "believes," "anticipates," "plans," "expects," "seeks," "estimates," and
    similar expressions are intended to identify forward-looking statements.
    There are a number of important factors that could cause the results of
    the Company to differ materially from those indicated by such
    forward-looking statements, including those detailed under the heading
    "Forward-looking Statements" in the Registrant's Fiscal 1997 Annual
    Report to Shareholders, which statements are incorporated herein by
    reference.

    (b) Financial Information About Industry Segments

         The Company's business is divided into three industry segments:
    Medical Products manufactured by the Company's Trex Medical subsidiary,
    Personal-care Products and Services provided by the Company's ThermoLase
    subsidiary, and Advanced Technology Research, including research
    conducted and products distributed by its Trex Communications subsidiary.
    The principal products produced and services rendered by the Company in
    these three segments are described in detail below. (See "Principal
    Products and Services.")

                                        4PAGE

        Financial information concerning the Company's industry segments is
    provided in Note 13 to Consolidated Financial Statements in the
    Registrant's Fiscal 1997 Annual Report to Shareholders, which information
    is incorporated herein by reference.

    (c)  Description of Business

         (i) Principal Products and Services

    Medical Products

         Trex Medical consists of four operating units: Lorad, Bennett X-Ray
    Corporation (Bennett), XRE, and Continental X-Ray Corporation
    (Continental). Lorad manufactures and markets mammography and minimally
    invasive digital breast-biopsy systems. Bennett's primary product line
    consists of general-purpose X-ray equipment. XRE manufactures and markets
    X-ray imaging systems used by interventional cardiologists in the
    diagnosis and treatment of blockages in coronary arteries and other
    vessels. Continental manufactures and markets a broad line of high-end
    general-purpose X-ray systems, as well as specialized units.

         Trex Medical sells its products through a worldwide network of more
    than 100 independent dealers and, to a lesser extent, on a direct basis.
    In addition to manufacturing and marketing its own systems, the Company
    manufactures systems and system components as an OEM for other medical
    equipment companies such as United States Surgical Corporation (U.S.
    Surgical) and the GE Medical Systems division of General Electric Company
    (GE).

    Mammography Systems

         Trex Medical designs, manufactures, and markets mammography systems
    that are differentiated on the basis of price and performance. Its
    high-end models are the Lorad M-IV and the Bennett Contour Plus, both of
    which can be upgraded to accept the full-field digital-imaging technology
    being developed by Trex Medical, when available. Trex Medical also offers
    two lower-priced models and two mobile mammography systems.

         Trex Medical has collected clinical data using its prototype
    full-field digital mammography system and, in December 1997, submitted a
    510(k) application with such data to the FDA, which must grant market
    clearance before the system can be marketed commercially.

        Trex Medical believes that demand in the market for mammography
    systems is driven primarily by technological innovation that results in
    better image quality. Although growth of the installed base has slowed,
    demand for new systems continues as older models are replaced with those
    offering technological innovations. In addition, Trex Medical believes
    that the market outside the United States will grow as more countries
    adopt mammography quality standards similar to those adopted in the
    United States.

                                        5PAGE

    Minimally Invasive Digital Breast-biopsy Systems

        The Company offers a variety of minimally invasive digital
    breast-biopsy systems, manufactured by Lorad and Bennett, that provide an
    alternative to surgical biopsy. These digital breast-biopsy systems were
    introduced to address the disadvantages of open surgical biopsy and can
    be performed on an outpatient basis under local anesthetic. The typical
    cost of a minimally invasive breast-biopsy procedure is approximately
    one-third that of an open surgical biopsy.

        The Company offers a dedicated prone table, the StereoGuide(R), and
    upright, add-on systems that can be attached to most of its mammography
    systems. Trex Medical's StereoGuide system is the subject of a lawsuit
    alleging infringement of a Fischer Imaging Corporation (Fischer) patent.
    See "Item 3 - Legal Proceedings."

        Trex Medical believes that the minimally invasive digital
    breast-biopsy system market will grow as the procedure becomes more
    widely accepted by the medical community and as pressures to contain
    healthcare costs increase. 

    General-purpose Radiography

        Trex Medical addresses the general-purpose X-ray market through its
    Bennett and Continental subsidiaries. Bennett primarily designs,
    manufactures, and markets low-cost, reliable systems to medical
    outpatient facilities, such as doctors' offices and surgi-care centers.
    Continental (and, to a lesser extent, Bennett) markets the more
    sophisticated and expensive X-ray systems typically used in hospitals and
    clinics. In addition, Bennett manufactures and markets imaging systems
    designed specifically for chiropractors and veterinarians.

        The U.S. market for general-purpose X-ray systems is stable, and
    consists primarily of replacement sales as customers upgrade older
    equipment. Trex Medical believes that the international market is
    substantially larger than the U.S. market and that the installed base of
    systems is still growing, particularly in developing countries. Trex
    Medical has recently expanded its international sales efforts. 

        Trex Medical believes digital imaging will have significant
    application in the general-purpose and specialized X-ray markets and that
    the technology it develops for its full-field digital imaging system may
    be adaptable to these applications. In general-purpose X-ray
    applications, Trex Medical believes digital imaging will produce better
    quality images and reduce operating costs by eliminating the need for
    film, processing equipment, and chemicals. In addition, digital imaging
    will permit the electronic storage of images on magnetic or optical
    media, as well as the transmission of images to multiple locations.
    Furthermore, Trex Medical believes digital imaging could make the image
    intensifiers, which are large and expensive components in certain imaging
    systems, obsolete.

                                        6PAGE

    Cardiac Catheterization, Angiography, and Electrophysiology

        Through its XRE subsidiary, Trex Medical designs, manufactures, and
    markets cardiac catheterization laboratories (also called cath labs) and
    positioners for cardiovascular imaging systems. XRE's imaging equipment
    is used in cath labs where angiography (the examination of blood vessels
    using X-rays following the injection of a radiopaque contrast medium) is
    performed by an interventional cardiologist. XRE systems are designed to
    provide real-time images of peripheral blood vessels and of the heart and
    coronary arteries for physicians performing diagnostic and interventional
    procedures such as balloon angioplasty.

        Trex Medical believes vascular and cardiovascular surgeons will
    increasingly use balloon angioplasty and other less-invasive techniques
    to treat vascular diseases. These procedures are performed under the
    guidance of X-ray imaging such as that provided by Trex Medical's
    equipment.

        To complement its cath labs, XRE has developed a line of digital
    image-processing systems, workstations, and archive alternatives. XRE's
    Digitec division, acquired in October 1997, manufactures physiological-
    monitoring equipment and digital-image archiving and networking systems
    used in cardiac catheterization procedures. In addition, Continental
    designs, manufactures, and sells electrophysiology systems that are used
    in the diagnosis and treatment of cardiac arrhythmia, which is
    characterized by the sudden, erratic beating of the heart and can result
    in cardiac arrest.

    Radiographic/Fluoroscopic Systems

        Through its Continental subsidiary, Trex Medical designs,
    manufactures, and markets radiographic/fluoroscopic (R/F) products. An
    R/F system is able to record dynamic events by capturing a series of
    images in a short period of time. For example, R/F systems are used for
    various gastrointestinal procedures to image in real-time the progress of
    a radiopaque ingested solution (typically barium) through the digestive
    tract.

    Personal-care Products and Services

    Laser-based Hair Removal

        ThermoLase's patented SoftLight system uses a low-energy, dermatology
    laser in combination with a specially developed lotion that directs and
    absorbs the laser's energy to disable hair follicles. Unlike
    electrolysis, the SoftLight system can disable numerous hair follicles at
    one time. As a result, ThermoLase believes that it will be able to
    address a larger market than electrolysis by offering hair removal from
    large areas, such as the legs. The lasers, which are similar to those
    used for tattoo and birthmark removal, are manufactured for ThermoLase by
    Trex Medical. The lotion is manufactured by ThermoLase's CBI Laboratories
    subsidiary.

                                        7PAGE

        In a typical treatment, the area from which hair is to be removed is
    given a gentle cleansing. The lotion is then applied to the skin, and the
    area is scanned several times with the laser beam. The laser energy is
    absorbed by the lotion that has penetrated the hair duct, causing the
    temperature of the lotion to increase to a level that disables the hair
    follicles. The laser treatment most effectively disables hair follicles
    in the active growing (anagen) stage of development, and at any one time,
    a certain percentage of hair follicles are in the resting (telogen)
    stage. Therefore, it is necessary for clients to return for one or more
    additional treatments to ensure that each follicle is treated while in
    the active stage of hair growth. The number of follow-up sessions
    required and the time interval between treatments varies depending on the
    particular characteristics of the client and the anatomical site being
    treated.

        ThermoLase's spas currently offer a variety of pricing programs,
    including a fixed fee for a single treatment (occurring over two visits)
    as well as fixed fees for multiple treatments during specified time
    periods. The per-session cost of the SoftLight system to the customer is,
    in general, substantially higher than the per-session costs of
    alternative methods of hair removal, including waxing, electrolysis, and
    shaving. The total cost of the SoftLight treatments in comparison to
    these alternatives varies depending on factors including the body part
    treated, the pricing plan selected, and the length of time for which hair
    is removed in comparison to such alternatives.

        In September 1997, ThermoLase introduced SoftLight 2.0, a
    modification of the hair-removal process that is intended to increase the
    effectiveness of the treatment. ThermoLase has modified its lotion,
    thereby eliminating the need for waxing, part of the process used in
    earlier treatment protocols, and added an additional step to better
    direct the laser energy into the hair follicle. ThermoLase is continuing
    to evaluate the results of the new protocol as well as the connection
    between follicle damage and long-term hair removal.

        ThermoLase opened its first Spa Thira in early fiscal 1996, and had a
    total of four opened by the end of fiscal 1996. In fiscal 1997,
    ThermoLase opened nine more domestic spas, and by October 1997 had a
    total of 14 domestic Spa Thira locations. In addition, ThermoLase's
    international arrangements resulted in the opening of spas in Paris in
    May 1997 and Lugano, Switzerland, in October 1997. A spa is also under
    construction in Dubai in the United Arab Emirates, and additional spas
    are expected to be constructed in Japan, Saudi Arabia, Brazil, and
    London, pending regulatory approvals.

        The international spas are being developed pursuant to joint ventures
    and other licensing arrangements. In January 1996, ThermoLase established
    a joint venture in Japan. During fiscal 1997, ThermoLase established
    joint ventures in France in November 1996 and England in September 1997,
    and six additional licensing arrangements: in Saudi Arabia in November
    1996; in Tunisia and Belgium in December 1996; in the United Arab
    Emirates and Oman in March 1997; in Switzerland in April 1997; in Brazil
    in June 1997; and in the United Kingdom (excluding England) and the
    Republic of Ireland in September 1997.

                                        8PAGE

        In June 1996, ThermoLase initiated a program to license its SoftLight
    technology to physicians. In this program, ThermoLase receives a
    per-procedure royalty that varies depending on the anatomical site
    treated and pricing plan selected by the client. It also provides the
    physicians with the lasers and supplies that are necessary to perform the
    service. As of November 1997, approximately 150 lasers were placed in
    practices in 33 states and certain international markets.

        ThermoLase's existing and planned spas are designed to reflect the
    environment of a luxurious day spa. ThermoLase believes that the
    uniformity of its centers will foster brand recognition and facilitate
    the opening of new spas. ThermoLase currently uses medical staff,
    including physicians and nurses, as well as other personnel, to operate
    the SoftLight system at its centers. ThermoLase advertises the SoftLight
    system through an advertising and public relations campaign focused on
    exposure in fashion and health magazines as well as the national news
    media.

    Skin-care and Other Personal-care Products

        ThermoLase's CBI Laboratories, Inc. (CBI) subsidiary designs,
    develops, manufactures, and packages high-quality personal-care products
    for sale to retailers under its own brand names and as a contract
    manufacturer under arrangements with third parties. CBI develops and
    manufactures most of its products, which include shampoos, lotions,
    shower creams, bath salts, and facial treatments, using botanicals and
    herbal extracts. CBI has the facilities and personnel to develop new
    product formulations, design packaging layouts, mix and fill
    formulations, and package final products for distribution. CBI does not
    manufacture packaging such as containers and boxes, but contracts with
    third parties for these supplies. CBI has a portfolio of approximately
    3,000 formulations, and may manufacture up to 300 different products in a
    quarter.

    Advanced Technology Research

        The Company is currently focusing its advanced technology research
    efforts in the areas of communications, avionics, X-ray detection, signal
    processing, and lasers. The Company has developed its expertise in these
    core technologies in connection with government-sponsored research and
    development.

    Laser Communication System (lasercom)

        Lasercom is a high-speed, high-bandwidth laser communication system,
    which the Company has been developing since 1989 under government-funded
    contracts. Through fiscal 1997, the Ballistic Missile Defense
    Organization has provided funding totaling $12.4 million. The lasercom
    system, which is in early-stage beta testing, is designed to move large
    amounts of data quickly via lasers, without the need for wires. Through
    the application of its lasercom technology, Trex Communications intends
    to commercialize products to meet the growing demand for high-speed,
    digital telecommunications technology, including opportunities in

                                        9PAGE

    ground-based networks, satellite-to-satellite crosslinks, and air-based
    systems.

        In September 1996, the Company received a $4.9 million contract (with
    options for an additional $0.4 million) from the Defense Airborne
    Reconnaissance Office (DARO) for advanced development of the lasercom
    system for use on aircraft. Under this contract, Trex Communications will
    apply its lasercom technology to develop a system that could be used on
    unmanned reconnaissance aircraft. Lasercom would provide a horizontal
    communications link to quickly transmit digitized images of the ground
    below the aircraft, for example, to another unmanned aircraft flying near
    a command post hundreds of miles away, where the information could be
    downlinked and analyzed. Under the contract, Trex Communications is
    developing a fully functional prototype to be tested using small
    commercial jets.

    Passive Microwave Camera

        The Company is developing a passive microwave camera (PMC), which is
    designed to enable the user to see objects hidden by fog and clouds and
    to see through certain opaque objects, such as building partitions. The
    PMC will be a totally passive device that emits no radiation and can
    produce real-time video images during the day or night without the
    clutter typical of radar.

        The Company believes the largest potential application of the PMC
    would be the incorporation of the device into airplanes for use during
    takeoffs, landings, and taxiing in adverse weather conditions. PMC
    acceptance is subject to certification by the Federal Aviation
    Administration (FAA). The U.S. Army has provided approximately
    $10.7 million in funding for PMC development over the last five years.
    Development continues under a $4.0 million U.S. Army Research Laboratory
    contract that was awarded in fiscal 1996.

        Under a $700,000 grant from the National Institute of Justice,
    awarded in fiscal 1997, the Company plans to conduct a PMC technology
    demonstration and evaluation program in cooperation with local law
    enforcement agencies.

    Other Projects

        In addition to the full-field digital mammography system being
    developed by Trex Medical, the Company is developing a next-generation
    digital medical imaging technology. This new system would incorporate a
    flat-panel, direct-digital detector that could provide even more
    information for earlier diagnoses. This system is based on complementary
    metal oxide semiconductor (CMOS) technology. The CMOS system would
    "directly" detect the X-rays and convert them into digital information,
    as opposed to converting them into visible light first before being
    digitized, as is the case with the Company's current full-field digital
    technology. Trex Medical has the right to license this technology as it
    pertains to certain medical applications. The Company is also exploring
    other nonmedical applications for this flat-panel direct-digital
    detection technology.

                                       10PAGE

        The Company is currently working on government-funded projects in
    several areas, including: (1) space surveillance - Under a contract from
    the U.S. Air Force Phillips Laboratory awarded in 1993, the Company is
    designing and building a system to produce high-resolution images of low-
    earth-orbit satellites. Through fiscal 1997, the Company has received
    $11.4 million under this contract. (2) ROBS (rapid optical beam steering)
    laser radar system - The Company has developed and extensively tested the
    ROBS system over the last 10 years, supported by more than $28 million in
    government funding. In fiscal 1996, the Company received a three-year
    $8.8 million contract from the U.S. Naval Air Warfare Center at China
    Lake, California, to continue development of this system, which is
    designed to simultaneously track multiple, fast-moving airborne objects
    with extreme precision. In July 1996, the Company received a $5.9 million
    contract from the U.S. Army Missile Command to build a new version of
    ROBS to meet Army specifications.

        (ii) New Products

        The Company's business includes the research and development of new
    products. (see "Principal Products and Services.")

        (iii) Raw Materials

        In connection with its SoftLight 2.0 process, ThermoLase currently
    uses a hydrogel product that is currently available from only one source.
    ThermoLase has been able to obtain an adequate supply of hydrogel to
    satisfy its current needs for the product, but there can be no assurance
    that it will be able to do so indefinitely or that it will continue to be
    able to obtain an adequate supply of the product at prices acceptable to
    ThermoLase. Other raw materials, components, and supplies purchased by
    the Company are either available from a number of different suppliers or
    from alternative sources that could be developed without a material
    adverse effect on the Company. To date, the Company has experienced no
    difficulties in obtaining these materials.

        (iv) Patents, Licenses, and Trademarks

        The Company protects its intellectual property through patents,
    trademarks, and trade secrets, as appropriate. In addition to relying on
    patents, the Company protects some of its technology as trade secrets and
    uses trademarks in association with certain products. The Company also
    enters into licensing arrangements to acquire rights in technology.

        The technology underlying the SoftLight system, including all patents
    issued thereon, belongs to the Company by virtue of a license agreement
    executed in February 1993 between ThermoLase and the inventor of the
    system, which grants ThermoLase an irrevocable, exclusive, worldwide,
    perpetual license to the technology in exchange for a $0.1 million
    commitment fee and a royalty equal to 0.25% of revenues generated from
    the sale or use of the SoftLight system through February 10, 2010.

        Patented inventions of the Company include certain mammography and
    other X-ray equipment, lasers, telescopes, high-power diamond switches,

                                       11PAGE

    laser-radar devices, microwave cameras, a laser-based hair-removal
    process, a Sonic CT system, a wind-shear detector, and methods of
    producing composites and ultrafine particles. Patent applications are
    pending on certain mammography equipment, a passive microwave camera, and
    a free-space laser communication system.

        The Company is a defendant in certain patent litigation and has been
    notified that it allegedly infringes certain other technology owned by a
    third party. See information under the heading "Intellectual Property
    Rights, Uncertainties, and Litigation" under the heading "Forward-looking
    Statements" in the Registrant's Fiscal 1997 Annual Report to
    Shareholders, which information is incorporated herein by reference.

        Several of the Company's patents were the result of research programs
    funded by the U.S. government. With the exception of a prohibition on
    disclosure of classified technology, the government does not impose
    significant restrictions on the Company's use of government-sponsored
    technology. The government retains a non-exclusive, royalty-free license
    to use technology developed under government contracts for government
    purposes, and could, in certain circumstances, transfer all commercial
    rights to technology to a third party if the Company does not pursue its
    development.

        (v) Seasonal Influences

        There are no significant seasonal influences on the Company's sales
    of products and services.

        (vi) Working Capital Requirements

        There are no special inventory requirements or credit terms extended
    to customers that would have a material adverse effect on the Company's
    working capital.

        (vii) Dependency on a Single Customer

        Medical Products segment revenues from OEM sales of a modified design
    of Trex Medical's stereotactic prone breast-biopsy system to U.S.
    Surgical accounted for 17% of Medical Products segment revenues and 14%
    of the Company's total revenues in fiscal 1997. No single customer
    accounted for more than 10% of the revenues of the Personal-care Products
    and Services segment in fiscal 1997. U.S. government agencies accounted
    for substantially all of the Advanced Technology Research segment
    revenues in fiscal 1997. The Company's Advanced Technology Research
    segment is heavily dependent on government funding through several
    agencies, and the loss of any of such agencies or customers would have a
    material adverse effect on this segment. 

        (viii) Backlog

        The backlog of firm orders for the Medical Products segment was
    $49.3 million as of September 27, 1997, compared with $65.3 million as of
    September 28, 1996. The backlog at September 28, 1996, was affected by a
    build-up of new orders for Trex Medical's M-IV mammography system, which

                                       12PAGE

    it began shipping in late fiscal 1996, and the timing of certain orders
    received in late fiscal 1996. The backlog of firm orders for the
    Personal-care Products and Services segment, which consisted exclusively
    of orders for CBI's products, was $2.8 million as of September 27, 1997,
    compared with $5.5 million as of September 28, 1996. The Company
    estimates that CBI will continue to represent a decreasing portion of
    total segment revenues as revenues from hair-removal services increase.
    The backlog of firm orders for the Advanced Technology Research segment
    was $15.0 million as of September 27, 1997, compared with $17.9 million
    as of September 28, 1996. Substantially all government contract orders
    included in this backlog were funded at September 27, 1997. The Company
    does not believe that the decreases in backlog are necessarily indicative
    of a trend. The Company believes that substantially all of its fiscal
    1997 backlog will be completed during fiscal 1998.

        (ix) Government Contracts

        Less than 10% of the Company's total revenues in fiscal 1997 were
    derived from contracts or subcontracts with the federal government, which
    are subject to renegotiation of profits or termination. There are no
    pending or, to the Company's knowledge, threatened renegotiations or
    terminations that are material to the Company.

        (x) Competition

    Medical Products

        The healthcare industry in general, and the market for imaging
    products in particular, is highly competitive. Trex Medical competes with
    a number of companies, many of which have substantially greater
    financial, marketing, and other resources than Trex Medical. Trex
    Medical's competitors include large companies such as GE, the Philips
    Medical Systems North America Company subsidiary of Philips N.V.
    (Philips), the Siemens Corporation subsidiary of Siemens AG (Siemens),
    Toshiba American Medical Systems, Inc., Toshiba America MRI, Inc.,
    Shimadzu, and Picker International, Inc., which compete in most
    diagnostic imaging modalities, including X-ray imaging. In addition, a
    significant portion of Trex Medical's sales are to U.S. Surgical and GE
    through OEM arrangements. The products sold through such OEM agreements
    compete with those offered by Trex Medical directly and through its
    independent dealers. Trex Medical's StereoLoc II, Cytoguide, and
    StereoGuide breast-biopsy systems compete with products offered by GE,
    Fischer Imaging Corporation, and Philips, and with conventional surgical
    biopsy procedures. Trex Medical competes primarily on the basis of
    product features, product performance, and reputation as well as price
    and service. Trex Medical believes that competition is likely to increase
    as a result of healthcare cost-containment pressures and the development
    of alternative diagnostic and interventional technologies.

    Personal-care Products and Services

        ThermoLase expects that, in the near term, the principal competitors
    relative to the hair-removal treatment using the SoftLight system will be
    electrolysis providers. The electrolysis market is characterized by many

                                       13PAGE

    small practitioners. Although ThermoLase believes that it has a
    significant competitive advantage over electrolysis, it does not have the
    well-established network of client relationships that many electrologists
    have. Over time, it is expected that ThermoLase will face growing
    competition from other laser-based hair-removal services. Four other
    laser manufacturers received market clearance from the FDA in 1997 for
    hair removal. ThermoLase expects that others, in addition to the laser
    companies that currently have clearance for hair removal, will seek to
    develop similar technologies and products that may compete directly with
    the SoftLight system. ThermoLase's services will also compete with other
    hair-removal products and methods. ThermoLase believes that competition
    for its hair-removal services is based primarily on efficacy, price,
    comfort, and safety.

        Should it receive clearance to market the SoftLight Rejuvenation
    Laser system for skin resurfacing, ThermoLase expects that its principal
    competitors will be providers of carbon dioxide laser and chemical peel
    resurfacing and traditional spa-based services. ThermoLase believes that
    its SoftLight Rejuvenation skin treatment system will offer customers an
    alternative to more aggressive skin-texture and wrinkle-treatment
    methods. 

        The professional skin-care and bath-and-body products markets are
    highly competitive. In selling its Salon product line, CBI competes with
    a number of small manufacturers and divisions of larger companies. The
    competition in this market is fragmented with no one competitor
    dominating the market. In the Custom Design and Store Brands groups, CBI
    competes with numerous contract packaging companies that can prepare and
    package custom formulations for customers. Some of these competitors have
    substantially greater financial, marketing, and research and development
    resources than those of ThermoLase. CBI competes in these markets by
    offering its customers exclusive product lines that ThermoLase believes
    can generally be sold at a lower price but with higher margins than CBI's
    competitors.

    Advanced Technology Research

        Trex Communications is engaged in segments of the telecommunications
    industry that are extremely competitive. In its lasercom division, Trex
    Communications expects to compete with large telecommunication service
    providers, such as the regional Bell operating companies, competitive
    access providers, and microwave and cellular service providers. Such
    companies have substantially greater financial, technical, marketing, and
    other resources than Trex Communications. Trex Communications' goal,
    however, is to enter into strategic relationships with certain of these
    competitors to provide components for the network systems that Trex
    Communications is developing and to market and sell lasercom technology
    and services. No assurance can be given that Trex Communications will be
    successful in creating such strategic relationships. In addition, Trex
    Communications' lasercom division expects to compete with other laser-
    based communication hardware and software providers, most of which have
    greater financial, technical, marketing, and other resources than Trex
    Communications.

                                       14PAGE

        Trex Communications' CCS subsidiary competes with a number of call
    automation companies, primarily on the basis of product features, product
    performance, and reputation, as well as price and service. Some of CCS'
    competitors have substantially greater financial, technical, marketing,
    and other resources than CCS.

        The Company competes for its research and development programs
    principally on the basis of technological innovations. As government
    funding becomes more scarce, particularly for defense projects, the
    competition for such funding will become more intense. In addition, as
    the Company's programs move from the development stage to procurement of
    large-scale, electro-optical systems, competition is expected to develop
    and intensify. Some of the Company's competitors for research and
    development funding and procurement have substantially greater resources
    than those of the Company.

        As the Company develops commercial products, it expects to encounter
    competition from various sources, including companies that will have
    substantially greater technical, marketing, and financial resources than
    those of the Company. The Company believes that its overall success will
    depend primarily on its ability to continue to make technological
    advances.

        (xi) Research and Development

        During the years ended September 27, 1997, and September 28, 1996,
    and the nine months ended September 30, 1995, the Company incurred
    $32,067,000, $24,986,000, and $13,430,000, respectively, on internally
    sponsored research and development programs, and $11,667,000,
    $10,278,000, and $11,803,000, respectively, on research and development
    programs sponsored by others. Approximately 344 professional employees
    were engaged full-time in research and development activities at
    September 27, 1997.

        (xii) Environmental Protection Regulations

        The Company believes that compliance with federal, state, and local
    environmental regulations will not have a material adverse effect on its
    capital expenditures, earnings, or competitive position. 

        (xiii) Number of Employees

        As of September 27, 1997, the Company had a total of 1,712 employees.

    (d) Financial Information about Exports by Domestic Operations

        Financial information about exports by domestic operations is
    summarized in Note 13 to Consolidated Financial Statements in the
    Registrant's Fiscal 1997 Annual Report to Shareholders, which information
    is incorporated herein by reference.

                                       15PAGE

    (e) Executive Officers of the Registrant

                                  Present Title (Fiscal Year First
    Name                    Age   Became Executive Officer)
    ---------------------------------------------------------------------
    Gary S. Weinstein       40    Chief Executive Officer (1996)
    John N. Hatsopoulos     63    Chief Financial Officer and
                                    Vice President (1990)
    Dr. Kenneth Y. Tang     50    Senior Vice President (1990)
    David A. Teitel         34    Vice President, Finance (1996)
    Paul F. Kelleher        55    Chief Accounting Officer (1990)
    Hal Kirshner            56    President and Chief Executive Officer,
                                    Trex Medical Corporation (1992)

        Each executive officer serves until his successor is chosen or
    appointed by the Board of Directors and qualified, or until earlier
    resignation, death, or removal. All executive officers, except Messrs.
    Weinstein, Kirshner, and Teitel have held comparable positions for at
    least five years with the Company or Thermo Electron. Mr. Weinstein has
    been Chief Executive Officer of the Company since February 1996. For at
    least five years prior to joining the Company, Mr. Weinstein held various
    positions at Lehman Brothers, an investment banking firm, including
    heading its global syndicate and equity capital market group from March
    1995 until joining the Company. Mr. Kirshner was President of Lorad from
    January 1991 to April 1997. Mr. Teitel has been Vice President, Finance
    of the Company since August 1996. Prior to joining the Company, Mr.
    Teitel was Vice President, Finance of Deknatel Snowden Pencer, Inc.
    (Deknatel), a manufacturer of specialty surgical products, from May 1995
    to August 1996, and was Director of Finance at Deknatel from August 1994
    to May 1995. From August 1985 to August 1994, Mr. Teitel held various
    positions at Arthur Andersen LLP, a professional services firm.
    Messrs. Hatsopoulos and Kelleher are full-time employees of Thermo
    Electron, but devote such time to the affairs of the Company as the
    Company's needs reasonably require.

    Item 2. Properties

        The location and general character of the Company's principal
    properties as of September 27, 1997, are as follows:

    Medical Products

        Trex Medical owns two office and manufacturing facilities: a
    62,500-square-foot facility in Danbury, Connecticut, and a
    164,000-square-foot facility in Broadview, Illinois. Trex Medical leases
    a 120,000-square-foot office and manufacturing facility in Copiague, New
    York, under a lease expiring in 2005, and a 156,000-square-foot office
    and manufacturing facility in Littleton, Massachusetts, under a lease
    expiring in 2012, and a 60,000-square-foot office and manufacturing
    facility in Danbury, Connecticut, under a lease expiring in 2007.

                                       16PAGE

    Personal-care Products and Services

        ThermoLase occupies approximately 213,000 square feet of office and
    manufacturing space in Carrollton, Texas, under a lease expiring in 2004,
    through its CBI subsidiary. ThermoLase also occupies approximately
    83,000 square feet of retail space for its Spa Thira salons, under leases
    expiring from 2000 through 2013.

    Advanced Technology Research

        The Company currently leases 90,000 square feet of office,
    engineering, and laboratory space in San Diego under a lease expiring in
    2006. In addition, CCS leases office, engineering, and manufacturing
    space of 42,000 and 4,000 square feet in Georgia and England,
    respectively, under leases expiring from 2001 through 2003. The Company
    also leases 25,000 square feet of office and warehouse facilities in San
    Diego under leases expiring in fiscal 1998.

        The Company believes that its facilities are in good condition and
    are suitable and adequate to meet current needs.

    Item 3. Legal Proceedings

        In April 1992, Fischer Imaging Corporation (Fischer) commenced a
    lawsuit in the United States District Court, District of Colorado,
    against Lorad, alleging that Lorad's prone breast-biopsy system infringes
    a Fischer patent on a precision mammographic needle-biopsy system. As of
    September 27, 1997, the Company had recognized aggregate revenues of
    approximately $107.1 million from the sale of such systems. The suit
    requests a permanent injunction, treble damages, and attorneys' fees and
    expenses. If the Company is unsuccessful in defending this lawsuit, it
    may be enjoined from manufacturing and selling its prone breast-biopsy
    system without a license from Fischer. No assurance can be given that the
    Company will be able to obtain such a license, if required, on
    commercially reasonable terms, if at all. In addition, the Company may be
    subject to damages for past infringement. No assurance can be given as to
    the amount that the Company may eventually be required to pay in expenses
    or in such damages.


    Item 4. Submission of Matters to a Vote of Security Holders

        Not applicable.

                                       17PAGE

                                     PART II

    Item 5. Market for Registrant's Common Equity and Related Stockholder
            Matters

        Information concerning the market and market price for the
    Registrant's Common Stock, $.01 par value, and dividend policy is
    included under the sections labeled "Common Stock Market Information" and
    "Dividend Policy" in the Registrant's Fiscal 1997 Annual Report to
    Shareholders and is incorporated herein by reference.


    Item 6. Selected Financial Data

        The information required under this item is included under the
    sections labeled "Selected Financial Information" and "Dividend Policy"
    in the Registrant's Fiscal 1997 Annual Report to Shareholders and is
    incorporated herein by reference.


    Item 7. Management's Discussion and Analysis of Financial Condition and
            Results of Operations

         The information required under this item is included under the
    heading "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" in the Registrant's Fiscal 1997 Annual Report to
    Shareholders and is incorporated herein by reference.


    Item 8. Financial Statements and Supplementary Data

        The Registrant's Consolidated Financial Statements and Supplementary
    Data are included in the Registrant's Fiscal 1997 Annual Report to
    Shareholders and are incorporated herein by reference.


    Item 9. Changes in and Disagreements with Accountants on Accounting and
            Financial Disclosures

        Not applicable.

                                       18PAGE

                                    PART III

    Item 10. Directors and Executive Officers of the Registrant

        The information concerning directors required under this item is
    incorporated herein by reference from the material contained under the
    caption "Election of Directors" in the Registrant's definitive proxy
    statement to be filed with the Securities and Exchange Commission
    pursuant to Regulation 14A, not later than 120 days after the close of
    the fiscal year. The information concerning delinquent filers pursuant to
    Item 405 of Regulation S-K is incorporated herein by reference from the
    material contained under the heading "Section 16(a) Beneficial Ownership
    Reporting Compliance" under the caption "Stock Ownership" in the
    Registrant's definitive proxy statement to be filed with the Securities
    and Exchange Commission pursuant to Regulation 14A, not later than 120
    days after the close of the fiscal year.


    Item 11. Executive Compensation

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Executive
    Compensation" in the Registrant's definitive proxy statement to be filed
    with the Securities and Exchange Commission pursuant to Regulation 14A,
    not later than 120 days after the close of the fiscal year.


    Item 12. Security Ownership of Certain Beneficial Owners and Management

         The information required under this item is incorporated herein by
    reference from the material contained under the caption "Stock Ownership"
    in the Registrant's definitive proxy statement to be filed with the
    Securities and Exchange Commission pursuant to Regulation 14A, not later
    than 120 days after the close of the fiscal year.


    Item 13. Certain Relationships and Related Transactions

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Relationship
    with Affiliates" in the Registrant's definitive proxy statement to be
    filed with the Securities and Exchange Commission pursuant to Regulation
    14A, not later than 120 days after the close of the fiscal year.

                                       19
PAGE

                                     PART IV

    Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K

    (a, d)   Financial Statements and Schedules

             (1)The consolidated financial statements set forth in the list
                below are filed as part of this Report.

             (2)The consolidated financial statement schedule set forth in
                the list below is filed as part of this Report.

             (3)Exhibits filed herewith or incorporated herein by reference
                are set forth in Item 14(c) below.

             List of Financial Statements and Schedules Referenced in this
             Item 14

             Information incorporated by reference from Exhibit 13 filed
             herewith:

                Consolidated Statement of Income
                Consolidated Balance Sheet
                Consolidated Statement of Cash Flows
                Consolidated Statement of Shareholders' Investment
                Notes to Consolidated Financial Statements
                Report of Independent Public Accountants

             Financial Statement Schedules filed herewith:

                Schedule II: Valuation and Qualifying Accounts

             All other schedules are omitted because they are not applicable
             or not required, or because the required information is shown
             either in the financial statements or in the notes thereto.

       (b)   Reports on Form 8-K

             None.

       (c)   Exhibits

             See Exhibit Index on the page immediately preceding exhibits.

                                       20PAGE

                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
    Exchange Act of 1934, the Registrant has duly caused this report to be
    signed by the undersigned, thereunto duly authorized.

    Date: December 5, 1997                  THERMOTREX CORPORATION

                                            By: Gary S. Weinstein
                                                -----------------------
                                                Gary S. Weinstein
                                                Chief Executive Officer

        Pursuant to the requirements of the Securities Exchange Act of 1934,
    this report has been signed below by the following persons on behalf of
    the Registrant and in the capacities indicated, as of December 5, 1997.

    Signature                           Title
    ---------                           -----

    By: Gary S. Weinstein              Chief Executive Officer, Chairman
        -----------------------------   of the Board, and Director
        Gary S. Weinstein                 

    By: John N. Hatsopoulos         Vice President, Chief Financial
        -----------------------------   Officer, and Director
        John N. Hatsopoulos               

    By: Paul F. Kelleher            Chief Accounting Officer
        -----------------------------
        Paul F. Kelleher

    By: Morton Collins              Director
        -----------------------------
        Morton Collins

    By: Peter O. Crisp              Director
        -----------------------------
        Peter O. Crisp

    By: Paul F. Ferrari             Director
        -----------------------------
        Paul F. Ferrari

    By: Dr. George N. Hatsopoulos   Director
        -----------------------------
        Dr. George N. Hatsopoulos

    By: _____________________________   Director
        Robert C. Howard

    By:                                 Director
        -----------------------------
        Nicholas T. Zervas


                                       21PAGE

                    Report of Independent Public Accountants

    To the Shareholders and Board of Directors of ThermoTrex Corporation:

        We have audited, in accordance with generally accepted auditing
    standards, the consolidated financial statements included in ThermoTrex
    Corporation's Annual Report to Shareholders incorporated by reference in
    this Form 10-K, and have issued our report thereon dated November 3,
    1997. Our audits were made for the purpose of forming an opinion on those
    statements taken as a whole. The schedule listed in Item 14 on page 20 is
    the responsibility of the Company's management and is presented for
    purposes of complying with the Securities and Exchange Commission's rules
    and is not part of the basic consolidated financial statements. The
    schedule has been subjected to the auditing procedures applied in the
    audits of the basic consolidated financial statements and, in our
    opinion, fairly states in all material respects the consolidated
    financial data required to be set forth therein in relation to the basic
    consolidated financial statements taken as a whole.



                                                Arthur Andersen LLP



    Boston, Massachusetts
    November 3, 1997

                                       22PAGE

  SCHEDULE II

                             THERMOTREX CORPORATION

                        Valuation and Qualifying Accounts
                                 (In thousands)



                                  Provision
                      Balance at    Charged    Accounts                Balance
                       Beginning         to     Written                 at End
  Description          of Period    Expense         Off    Other(a)  of Period
  -----------         ----------  ---------    --------    --------  ---------
  Allowance for
    Doubtful Accounts

  Year Ended
    September 27, 1997    $1,586    $  279      $ (164)     $  268     $1,969
   
  Year Ended
    September 28, 1996    $1,141    $  336      $ (163)     $  272     $1,586

  Nine Months Ended
    September 30, 1995    $  643    $  178      $    -      $  320     $1,141

  (a) Allowances of businesses acquired during the year as described in Note 3
      to Consolidated Financial Statements in the Registrant's Fiscal 1997
      Annual Report to Shareholders.

                                       23PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number     Description of Exhibit

      3.1      Restated Certificate of Incorporation, as amended (filed as
               Exhibit 3(i) to the Registrant's Quarterly Report on Form
               10-Q for the fiscal quarter ended July 2, 1994 [File No.
               1-10791] and incorporated herein by reference).

      3.2      By-Laws of the Registrant, as amended and restated (filed as
               Exhibit 3.2 to the Registrant's Transition Report on Form
               10-K for the transition period January 1, 1995, through
               September 30, 1995 [File No. 1-10791] and incorporated herein
               by reference).

      4.1      Indenture dated as of October 28, 1997, by and among the
               Registrant, Thermo Electron Corporation, and Bankers Trust
               Company, as Trustee, relating to $124.5 principal amount of
               the Registrant's 3 1/4% Subordinated Convertible Debentures
               due 2007 (filed as Exhibit 4.1 to the Registrant's Current
               Report on Form 8-K dated October 28, 1997, and filed with the
               Securities and Exchange Commission on October 29, 1997, and
               incorporated herein by reference).

      4.2      Fiscal Agency Agreement dated as of August 12, 1997, among
               ThermoLase Corporation, Thermo Electron Corporation, and
               Bankers Trust Company, as Fiscal Agent, relating to
               $115,000,000 principal amount of ThermoLase's 4 3/8%
               Subordinated Convertible Debentures due 2004 (filed as
               Exhibit 4.3 to ThermoLase Corporation's Annual Report on Form
               10-K for the fiscal year ended September 27, 1997 [File No.
               1-13104] and incorporated herein by reference).

     10.1      Asset Transfer Agreement dated December 29, 1990, between
               Thermo Electron Corporation and the Registrant (filed as
               Exhibit 10(a) to the Registrant's Registration Statement on
               Form S-1 [Reg. No. 33-40972] and incorporated herein by
               reference).

     10.2      Amended and Restated Corporate Services Agreement dated
               January 3, 1993, between Thermo Electron Corporation and the
               Registrant (filed as Exhibit 10(b) to the Registrant's Annual
               Report on Form 10-K for the fiscal year ended January 2, 1993
               [File No. 1-10791] and incorporated herein by reference).

     10.3      Form of Indemnification Agreement between the Registrant and
               its officers and directors (filed as Exhibit 10(f) to the
               Registrant's Registration Statement on Form S-1
               [Reg. No. 33-40972] and incorporated herein by reference).

     10.4      Thermo Electron Corporate Charter as amended and restated
               effective January 3, 1993 (filed as Exhibit 10(g) to the
               Registrant's Annual Report on Form 10-K for the fiscal year
               ended January 2, 1993 [File No. 1-10791] and incorporated
               herein by reference).

                                       24PAGE

                                  EXHIBIT INDEX
    Exhibit
    Number     Description of Exhibit
     10.5      Stock Option Agreement granted to Anthony J. Pellegrino dated
               November 16, 1992 (filed as Exhibit 10(n) to the Registrant's
               Annual Report on Form 10-K for the fiscal year ended
               January 2, 1993 [File No. 1-10791] and incorporated herein by
               reference).

     10.6      Stock Option Agreement granted to Hal Kirshner dated
               November 16, 1992 (filed as Exhibit 10(o) to the Registrant's
               Annual Report on Form 10-K for the fiscal year ended
               January 2, 1993 [File No. 1-10791] and incorporated herein by
               reference).

     10.7      Lease dated October 12, 1988, between CBI Laboratories, Inc.,
               Trammell Crow Company No. 91, and Petula Associates Ltd., as
               amended (filed as Exhibit 10.18 to the Registrant's Annual
               Report on Form 10-K for the fiscal year ended January 1, 1994
               [File No. 1-10791] and incorporated herein by reference).

     10.8      Lease dated September 1, 1993, between CBI Laboratories, Inc.
               and Lincoln Valwood, Ltd. (filed as Exhibit 10.19 to the
               Registrant's Annual Report on Form 10-K for the fiscal year
               ended January 1, 1994 [File No. 1-10791] and incorporated
               herein by reference).

     10.9      Master Repurchase Agreement dated as of January 1, 1994,
               between the Registrant and Thermo Electron Corporation.

     10.10     Master Guarantee Reimbursement Agreement dated as of January
               1, 1994, among the Registrant, ThermoLase Corporation, and
               Thermo Electron Corporation (filed as Exhibit 10.6 to
               ThermoLase's Registration Statement on Form S-1 [Reg. No.
               33-78052] and incorporated herein by reference).

     10.11     Lease executed February 9, 1995, between LMP Properties Ltd.
               and the Registrant (filed as Exhibit 10.22 to the
               Registrant's Annual Report on Form 10-K for the fiscal year
               ended December 31, 1994 [File No. 1-10791] and incorporated
               herein by reference).

     10.12     Stock purchase agreement dated as of September 15, 1995, by
               and among Bennett X-Ray Corporation, ThermoTrex Corporation,
               and Calvin Kleinman, Robert P. Coe, Walter F. Schneider, and
               Martin Koening (filed as Exhibit 2 to the Registrant's
               Current Report on Form 8-K dated September 14, 1995 [File No.
               1-10791] and incorporated herein by reference).

     10.13     Lease dated as of September 15, 1995, by and among the
               Registrant and BK Realty Associates, L.P. and Calrob Realty
               Associates (filed as Exhibit 10.26 to the Registrant's
               Transition Report on Form 10-K for the transition period
               January 1, 1995, through September 30, 1995 [File No.
               1-10791] and incorporated herein by reference). 
                                       25PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number     Description of Exhibit

     10.14     Incentive Stock Option Plan of the Registrant (filed as
               Exhibit 10(h) to the Registrant's Registration Statement on
               Form S-1 [Reg. No. 33-40972] and incorporated herein by
               reference). (Maximum number of shares issuable in the
               aggregate under this plan and the Registrant's Nonqualified
               Stock Option Plan is 1,945,000 shares, after adjustment to
               reflect share increases approved in 1992 and 1993 and 3-for-2
               stock split effected in October 1993).

     10.15     Nonqualified Stock Option Plan of the Registrant (filed as
               Exhibit 10(i) to the Registrant's Registration Statement on
               Form S-1 [Reg. No. 33-40972] and incorporated herein by
               reference). (Maximum number of shares issuable in the
               aggregate under this plan and the Registrant's Incentive
               Stock Option Plan is 1,945,000 shares, after adjustment to
               reflect share increases approved in 1992 and 1993 and 3-for-2
               stock split effected in October 1993).

     10.16     ThermoTrex Corporation - ThermoLase Corporation (formerly
               ThermoLase Inc.) Nonqualified Stock Option Plan (filed as
               Exhibit 10.53 to the Registrant's Annual Report on Form 10-K
               for the fiscal year ended January 1, 1994 [File No. 1-10791]
               and incorporated herein by reference).

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

     10.18     ThermoTrex Corporation - Trex Communications Corporation
               Nonqualified Stock Option Plan.

     10.19     Directors Stock Option Plan of the Registrant (filed as
               Exhibit 10.26 to the Registrant's Annual Report on Form 10-K
               for the fiscal year ended December 31, 1994 [File No.
               1-10791] and incorporated herein by reference).

               In addition to the stock-based compensation plans of the
               Registrant, the executive officers of the Registrant may be
               granted awards under stock-based compensation plans of Thermo
               Electron Corporation for services rendered to the Registrant
               or such affiliated corporations. Such plans were filed as
               Exhibits 10.21 through 10.45 to the Annual Report on Form
               10-K of Thermo Electron for the fiscal year ended December
               28, 1996 [File No. 1-8002] and are incorporated herein by
               reference.

                                       26PAGE

                                  EXHIBIT INDEX
    Exhibit
    Number     Description of Exhibit
     10.20     Operating Agreement of ThermoLase Japan L.L.C. dated as of
               January 22, 1996, between ThermoLase Corporation and Fox
               River Japan Partners, L.P. (filed as Exhibit 10.1 to
               ThermoLase's Quarterly Report on Form 10-Q for the quarter
               ended December 30, 1995 [File No. 1-13104] and incorporated
               herein by reference).

     10.21     License Agreement dated as of January 22, 1996, between
               ThermoLase Corporation and ThermoLase Japan L.L.C. (filed as
               Exhibit 10.2 to ThermoLase's Quarterly Report on Form 10-Q
               for the quarter ended December 30, 1995 [File No. 1-13104]
               and incorporated herein by reference).

     10.22     Option Agreement dated as of January 22, 1996, between
               ThermoLase Corporation and Fox River Japan Partners, L.P.
               (filed as Exhibit 10.3 to ThermoLase's Quarterly Report on
               Form 10-Q for the quarter ended December 30, 1995 [File No.
               1-13104] and incorporated herein by reference).

     10.23     Amendment to Operating Agreement of ThermoLase Japan L.L.C.
               dated as of May 1, 1996, by and among ThermoLase Corporation,
               Fox River Partners L.P., and ThermoLase Japan L.L.C. (filed
               as Exhibit 10.29 to ThermoLase Corporation's Annual Report on
               Form 10-K for the fiscal year ended September 27, 1997 [File
               No. 1-13104] and incorporated herein by reference).

     10.24     License Agreement dated as of October 30, 1995, between
               ThermoLase Corporation and Ronald G. Wheeland, M.D.,
               Professional Corporation (filed as Exhibit 10.4 to
               ThermoLase's Quarterly Report on Form 10-Q for the quarter
               ended December 30, 1995 [File No. 1-13104] and incorporated
               herein by reference).

     10.25     Management Agreement dated as of October 30, 1995, between
               ThermoLase Corporation and Ronald G. Wheeland, M.D.,
               Professional Corporation (filed as Exhibit 10.5 to
               ThermoLase's Quarterly Report on Form 10-Q for the quarter
               ended December 30, 1995 [File No. 1-13104] and incorporated
               herein by reference).

     10.26     Sublease Agreement dated as of October 30, 1995, between
               ThermoLase Corporation and Ronald G. Wheeland, M.D.,
               Professional Corporation (filed as Exhibit 10.6 to
               ThermoLase's Quarterly Report on Form 10-Q for the quarter
               ended December 30, 1995 [File No. 1-13104] and incorporated
               herein by reference).

     10.27     Lease dated as of April 12, 1995, between ThermoLase
               Corporation and The Goldberg Family Trust (filed as Exhibit
               10.7 to ThermoLase's Quarterly Report on Form 10-Q for the
               quarter ended December 30, 1995 [File No. 1-13104] and
               incorporated herein by reference).
                                       27PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number     Description of Exhibit

     10.28     Lease dated as of December 8, 1995, between ThermoLase
               Corporation and Canon Properties (filed as Exhibit 10.8 to
               ThermoLase's Quarterly Report on Form 10-Q for the quarter
               ended December 30, 1995 [File No. 1-13104] and incorporated
               herein by reference).

     10.29     Lease dated as of January 17, 1996, between ThermoLase
               Corporation and Trammell Crow Equity Partners (filed as
               Exhibit 10.9 to ThermoLase's Quarterly Report on Form 10-Q
               for the quarter ended December 30, 1995 [File No. 1-13104]
               and incorporated herein by reference).

     10.30     Lease dated as of December 20, 1995, between Melvyn J. Powers
               and Mary P. Powers D/B/A M&M Realty and Trex Medical
               Corporation as amended (filed as Exhibit 10.14 to Trex
               Medical's Registration Statement on Form S-1 [Reg. No.
               333-2926] and incorporated herein by reference).

     10.31     Lease dated May 29, 1996, between John K. Grady, Trustee of
               Concord Associates Foster Street Trust and XRE Corporation
               (filed as Exhibit 10.89 to Trex Medical's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and incorporated
               herein by reference).

     10.32     Asset Purchase Agreement dated September 4, 1996, by and
               among CXR Acquisition Corp., Trex Medical Corporation,
               Continental X-Ray Corporation, Alphatek Corporation,
               Broadview Manufacturing Corporation, Haymarket Square
               Associates, Advanced Medical Imaging, Inc., Trans-Continental
               X-ray Corporation, and the Stockholders and Partners thereof
               (filed as Exhibit 10.21 to Trex Medical's Registration
               Statement on Form S-1 [Reg. No. 333-15381] and incorporated
               herein by reference).

     10.33     Master Joint Venture Agreement dated as of October 30, 1996,
               among ThermoLase Corporation, Franklin Holdings, S.A., and
               Yves Micheli (filed as Exhibit 10.26 to ThermoLase's Annual
               Report on Form 10-K for the fiscal year ended September 28,
               1996 [File No. 1-13104] and incorporated herein by
               reference).

     10.34     SoftLight and Spa Thira Franchise and License Agreement dated
               as of November 8, 1996, between ThermoLase Corporation and
               Medical Supply & Service Co. (filed as Exhibit 10.27 to
               ThermoLase's Annual Report on Form 10-K for the fiscal year
               ended September 28, 1996 [File No. 1-13104] and incorporated
               herein by reference).

                                       28PAGE

                                  EXHIBIT INDEX

    Exhibit
    Number     Description of Exhibit

     10.35     Equipment License Agreement for SoftLight Lasers dated as of
               November 8, 1996, between ThermoLase Corporation and Medical
               Supply & Service Co. (filed as Exhibit 10.28 to ThermoLase's
               Annual Report on Form 10-K for the fiscal year ended
               September 28, 1996 [File No. 1-13104] and incorporated herein
               by reference).

     10.36     Promissory Note due April 30, 1997, issued by the Registrant
               to Thermo Electron Corporation (filed as Exhibit 10.35 to the
               Registrant's Annual Report on Form 10-K for the fiscal year
               ended September 28, 1996, and incorporated herein by
               reference).

     10.37     Promissory Note due October 5, 1998, issued by the Registrant
               to Thermo Electron Corporation (filed as Exhibit 10.1 to the
               Registrant's Quarterly Report on Form 10-Q for the quarter
               ended June 28, 1997, and incorporated herein by reference).

     10.38     Amended and Restated Stock Holding Assistance Plan and Form
               of Promissory Note.

     10.39     Deferred Compensation Plan for Directors of the Registrant
               (filed as Exhibit 10(j) to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 33-40972] and incorporated
               herein by reference).

     11        Statement re: Computation of Earnings per Share.

     13        Annual Report to Shareholders for the fiscal year ended
               September 27, 1997 (only those portions incorporated herein
               by reference).

     21        Subsidiaries of the Registrant.

     23        Consent of Arthur Andersen LLP.

     27        Financial Data Schedule.
     
     99.1      Form of ThermoLase Corporation Unit Certificate (filed as
               Exhibit 4.1 to ThermoLase's Registration Statement on Form
               S-4 [Reg. No. 333-19633] and incorporated herein by
               reference).