ZYGO CORP
S-3, 1995-08-24
OPTICAL INSTRUMENTS & LENSES
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     As filed with the Securities and Exchange Commission on August 24, 1995
                                                    Registration No. 33-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

                                   ----------

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                   ----------

                                ZYGO CORPORATION
             (Exact name of registrant as specified in its charter)

            Delaware                                    06-0864500
   (State or other jurisdiction                      (I.R.S. Employer
   of incorporation or organization)               Identification Number)

                                Laurel Brook Road
                       Middlefield, Connecticut 06455-0448
                                 (203) 347-8506

    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                                   ----------

                                 GARY K. WILLIS
                             Chief Executive Officer
                                ZYGO CORPORATION
                                Laurel Brook Road
                       Middlefield, Connecticut 06455-0448
                                 (203) 347-8506

 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)

                                   ----------

       Copies of all communications, including all communications sent to
                   the agent for service, should be sent to:

                                PAUL JACOBS, ESQ.
                           FULBRIGHT & JAWORSKI L.L.P.
                                666 Fifth Avenue
                            New York, New York 10103

Approximate  date of  commencement  of proposed  sale to the public:  As soon as
practicable after the effective date of this Registration Statement.

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box: /_/

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box: /X/

     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  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,
please check the following box: /_/

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





                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>

====================================================================================================================================
  Title of each class of                                          Proposed maximum         Proposed maximum
     securities to be                                            offering price per       aggregate offering           Amount of
        registered               Amount to be registered               unit(1)                  price              registration fee
====================================================================================================================================

<S>                                  <C>                               <C>                   <C>                       <C>
     Common Stock, 
  $.10 par value per 
        share                        615,000  shares                  $26.875                $16,528,125               $5,700
====================================================================================================================================

</TABLE>

(1)      Calculated in accordance  with Rule 457(c) under the  Securities Act of
         1933,  as  amended,   solely  for  the  purposes  of  calculating   the
         registration  fee. The calculation of the  registration fee is based on
         the average of the high and low prices of the Common  Stock as reported
         on the  Nasdaq  National  Market on August  22,  1995 ($26 and  $27.75,
         respectively).

         =======================================================================



The registrant hereby amends this  registration  statement on such date or dates
as may be necessary to delay its effective date until the registrant  shall file
a further amendment which specifically  states that this registration  statement
shall  thereafter  become  effective  in  accordance  with  section  8(a) of the
Securities  Act of  1933  or  until  the  registration  statement  shall  become
effective on such date as the Commission,  acting pursuant to said section 8(a),
may determine.

                                       


<PAGE>



                              Subject to Completion
                  Preliminary Prospectus dated August 24, 1995

                                 615,000 Shares

                                ZYGO CORPORATION

                                  COMMON STOCK

     This  Prospectus  relates to 615,000 shares (the "Shares") of Common Stock,
par value $0.10 per share (the "Common Stock"),  of Zygo Corporation  ("Zygo" or
the "Company") which are being offered for sale by certain selling  stockholders
(the "Selling  Stockholders").  See "Selling Stockholders." The Company's Common
Stock is traded on the Nasdaq  Stock  Market's  National  Market (the  "National
Market")  under the symbol "ZIGO." On August 22, 1995, the closing sale price of
the Common Stock,  as listed on the National Market and reported by the National
Quotation  Bureau  Incorporated,  was  $27 per  share.  On July  20,  1995,  the
Company's Board of Directors declared a 3 for 2 stock split effected in the form
of a 50% stock dividend, payable on August 21, 1995 to stockholders of record at
the close of business on August 1, 1995. Unless otherwise indicated,  the number
of shares being offered for sale hereunder and all share and option  information
included in this Prospectus under the headings "Selling Stockholders" and "Legal
Matters"  has been  adjusted to reflect  such stock split as if it had  occurred
prior to the date as of which the information is given.

     The Company will not receive any of the  proceeds  from sales of the Shares
by the Selling Stockholders.  The Shares may be offered from time to time by the
Selling  Stockholders  through ordinary  brokerage  transactions,  in negotiated
transactions or otherwise, at market prices prevailing at the time of sale or at
negotiated prices. See "Plan of Distribution."

     The Selling  Stockholders may be deemed to be  "Underwriters" as defined in
the  Securities  Act  of  1933,  as  amended  (the  "Securities  Act").  If  any
broker-dealers  are used to effect sales, any commissions paid to broker-dealers
and, if  broker-dealers  purchase any of the Shares as  principals,  any profits
received by such  broker-dealers on the resale of the Shares may be deemed to be
underwriting discounts or commissions under the Securities Act. In addition, any
profits  realized by the Selling  Stockholders  may be deemed to be underwriting
commissions. All costs, expenses and fees in connection with the registration of
the  Shares  will  be  borne  by the  Company.  Brokerage  commissions,  if any,
attributable   to  the  sale  of  the  Shares  will  be  borne  by  the  Selling
Stockholders.

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

     See "Risk  Factors" for certain  information  that should be  considered by
prospective investors.

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

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

                 The date of this Prospectus is August 24, 1995

                                       -1-


<PAGE>



                              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 periodic reports,  proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports,  proxy
statements and other  information filed with the Commission may be inspected and
copied at the Public  Reference  Section of the  Commission at 450 Fifth Street,
N.W.,  Washington,  D.C.  20549 and at the  regional  offices of the  Commission
located at 500 West Madison Street,  Chicago,  Illinois  60661,  and Seven World
Trade Center, New York, New York 10048.  Copies of such material can be obtained
from the Public  Reference  Section of the  Commission  at  prescribed  rates by
writing to the Commission at 450 Fifth Street,  N.W.,  Washington,  D.C.  20549.
Copies may also be  inspected at the reading room of the library of the National
Association of Securities Dealers, Inc., 1735 K Street, Washington, D.C. 20006.

     This Prospectus  constitutes a part of a Registration Statement on Form S-3
(herein,  together  with  all  amendments  and  exhibits,  referred  to  as  the
"Registration  Statement")  filed by the Company with the  Commission  under the
Securities  Act. This  Prospectus  does not contain all of the  information  set
forth in the  Registration  Statement,  certain  parts of which are  omitted  in
accordance  with the  rules  and  regulations  of the  Commission.  For  further
information  with  respect to the Company  and the Common  Stock,  reference  is
hereby  made  to  the  Registration   Statement.   Statements  contained  herein
concerning the provisions of any document are not necessarily  complete,  and in
each instance reference is made to the copy of such document filed as an exhibit
to the Registration Statement or otherwise filed with the Commission.  Each such
statement is qualified in its entirety by such reference.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

The  following  documents,  which  are on file  with the  Commission  (File  No.
0-12944),  are  incorporated  in this  Prospectus  by reference  and made a part
hereof:

     (a) The Company's Annual Report on Form 10-K for the fiscal year ended June
30, 1994, filed on September 28, 1994.

     (b) The  Company's  Quarterly  Report on Form 10-Q for the  fiscal  quarter
ended September 30, 1994, filed on November 4, 1994.

     (c) The  Company's  Quarterly  Report on Form 10-Q for the  fiscal  quarter
ended December 31, 1994, filed on February 7, 1995.

     (d) The  Company's  Quarterly  Report on Form 10-Q for the  fiscal  quarter
ended March 31, 1995, filed on May 11, 1995.

                                       -2-



<PAGE>


     (e) The Company's Current Report on Form 8-K, dated July 20, 1995, filed on
July 20, 1995.

     (f) The Company's  Current Report on Form 8-K, dated August 22, 1995, filed
on August 23, 1995.

     (g) The  description of the Company's  Common Stock  contained in Item 1 of
the Company's Registration Statement on Form 8-A dated October 26, 1984.

     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 this offering 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 in a document incorporated or deemed
to be  incorporated  by  reference  herein  shall be  deemed to be  modified  or
superseded  for all  purposes to the extent that a statement  contained  in this
Prospectus or any other subsequently filed document that is also incorporated by
reference  herein modifies or supersedes such statement.  Any such statements 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 each  person  to whom this
Prospectus is delivered,  upon written or oral request of such person, a copy of
any or all of the foregoing  documents  incorporated  herein by reference (other
than  exhibits  to  such  documents,   unless  such  exhibits  are  specifically
incorporated by reference into such  documents).  Written or telephone  requests
should  be  directed  to  Zygo  Corporation,  Laurel  Brook  Road,  Middlefield,
Connecticut 06455-0448,  Attention: Mark J. Bonney, Vice President,  Finance and
Administration, (203) 347-8506.

     The Company  furnishes its  stockholders  with an annual report  containing
audited financial  statements.  In addition,  the Company may furnish such other
reports as may be authorized, from time to time, by the Board of Directors.

                                       -3-



<PAGE>



                                  RISK FACTORS

     In addition to the other  information  in this  Prospectus,  the  following
factors  should be  considered  carefully  in  evaluating  the  Company  and its
business before purchasing the shares of Common Stock offered hereby.

     Dependence on Cyclical Industries.  The Company's business is significantly
dependent  on  capital  expenditures  by  manufacturers  of  semiconductors  and
components for the computer disk drive industry.  These  industries are cyclical
and  have  historically   experienced   periods  of  oversupply,   resulting  in
significantly  reduced  demand for capital  equipment,  including  the  products
manufactured and marketed by the Company.  The Company's net sales and operating
results may be  materially  adversely  affected if downturns or slowdowns in the
semiconductor or computer disk drive markets occur in the future.

     Ability to Respond to  Technological  Change.  The Company's future success
will depend upon its ability to enhance its current  products and to develop and
introduce  new  products  that  keep pace with  technological  developments  and
evolving  industry  standards,  respond to changes in customer  requirements and
achieve market  acceptance.  Any failure by the Company to anticipate or respond
adequately  to  technological  developments  and customer  requirements,  or any
significant delays in product development or introduction, could have a material
adverse effect on the Company's business, operating results, financial condition
and  liquidity.  There  can be no  assurance  that Zygo  will be  successful  in
developing  and  marketing  new  products  and  services  or product and service
enhancements  on a  timely  basis  or  that  the  Company  will  not  experience
significant  delays  in  the  introduction  of new  products  and  services.  In
addition, there can be no assurance the new products and services or product and
service enhancements developed by the Company will achieve market acceptance.

     Dependence on  Proprietary  Technology.  The  Company's  success is heavily
dependent upon its  proprietary  technology.  There can be no assurance that the
steps  taken by the  Company  to  protect  its  proprietary  technology  will be
adequate to prevent  misappropriation of its technology by third parties or will
be adequate under the laws of some foreign countries,  which may not protect the
Company's proprietary rights to the same extent as do laws of the United States.
In  addition,  there can be no  assurance  that  third  parties  will not assert
successfully technology infringement claims against the Company.

     Risks  Associated  with  Potential  Acquisitions.  The  Company's  business
strategy  includes the  expansion of its  products  and  services,  which may be
effected through  acquisitions.  Acquisitions involve numerous risks,  including
difficulties in the  assimilation of the operations and products of the acquired
companies,  the ability to manage effectively  geographically  remote units, the
diversion of  management's  attention  from other  business  concerns,  risks of
entering  markets in which the Company has limited or no direct  experience  and
the  potential  loss of  key employees of the acquired  companies.  In addition,

                                       -4-



<PAGE>


acquisitions may involve the immediate  expenditure of significant  funds or the
issuance of  significant  shares of Common Stock,  or any  combination  thereof.
Although  management  expects to carefully  analyze any such opportunity  before
committing  the  Company's  resources,  there  can  be  no  assurance  that  any
acquisition  will  result in  long-term  benefits  to the Company or that Zygo's
management will be able to manage effectively the resulting businesses.

     Management  of Growth.  The Company is currently  experiencing  a period of
rapid growth and expansion,  which would be further intensified in the event the
Company is involved in a  significant  acquisition.  This growth  expansion  has
placed  and  could  continue  to place a  significant  strain  on the  Company's
personnel and other resources.  The Company's growth has resulted in an increase
in the level of responsibility for the Company's management  personnel.  Certain
of the  Company's  management  personnel  have had limited or no  experience  in
managing companies as large as or larger than the Company. The Company's ability
to manage growth effectively will require the Company to continue to improve its
operational,  management and financial  systems and controls and to successfully
train, motivate and manage its employees.  If the Company's management is unable
to manage growth  effectively,  the Company's  business,  results of operations,
financial condition and liquidity could be materially and adversely affected.

     Dependence on Key Personnel.  Zygo's success depends in large part upon the
continued  services  of  many  of  its  highly  skilled  personnel  involved  in
management,  research  and  development  and sales and  marketing,  and upon its
ability to  attract  and  retain  additional  highly  qualified  employees.  The
Company's employees may voluntarily  terminate their employment with the Company
at any time.  Competition  for such  personnel  is intense,  and there can be no
assurance  that  the  Company  will be  successful  in  retaining  its  existing
personnel or attracting and retaining additional personnel.

     Dependence  on  Third-Party  Suppliers.   Certain  of  the  components  and
subassemblies  included  in the  Company's  systems are  obtained  from a single
source or a limited  group of  suppliers.  Although the Company  seeks to reduce
dependence on sole and limited  source  suppliers in some cases,  the partial or
complete  loss of  certain  of these  sources  could  have at least a  temporary
adverse  effect on the  Company's  results of  operations  and  damage  customer
relationships.

     Relationship  With  Canon Inc.  and Canon  Sales  Co.,  Inc.  Prior to this
offering,  Canon Inc.  ("Canon") owns  approximately 20% of the Company's Common
Stock. In addition, one executive officer of Canon's U.S. subsidiary is a member
of the  Company's  Board of  Directors.  Canon and Canon  Sales  Co.,  Inc. is a
significant  customer  of the Company,  with  aggregate  sales by the Company to
these entities amounting to $9,550,000 and $7,740,000 for the fiscal years ended
June 30, 1995 and 1994, respectively.  In addition, Canon Sales Co., Inc. is the
Company's  exclusive  distributor  for sales of the  Company's  products  in the
Japanese market.

                                       -5-



<PAGE>



     Customer  Concentration.  Sales to the Company's  two largest  customers in
fiscal  1995  and  fiscal  1994   accounted  for  47%  and  41%  of  net  sales,
respectively.  During  these fiscal  years,  sales to Canon and Canon Sales Co.,
Inc.,  the  Company's   largest   customer  in  those  periods,   accounted  for
approximately 30% and 32%, respectively, of the Company's net sales. The Company
expects that sales to Canon and Canon Sales Co., Inc. will continue to represent
a significant  percentage of the Company's net sales for the foreseeable future.
During fiscal 1995,  sales to a manufacturer of computer disk drives and related
hardware and software  accounted  for  approximately  17% of the  Company's  net
sales. The Company's customers generally do not enter into long-term  agreements
obligating  them to purchase  the  Company's  products.  A reduction or delay in
orders from either of these two customers, including reductions or delays due to
market,  economic,  or competitive  conditions in the  semiconductor or computer
disk drive  industries,  could have a material adverse effect upon the Company's
result of operations.

     Revenues  Derived  from  International  Sales and Foreign  Operations.  The
company's  products  are  sold  internationally  by  the  Company  primarily  to
customers in Japan.  Revenues from sales to customers  outside the United States
accounted  for 47% and 46% of the Company's  total  revenues in the fiscal years
ended June 30,  1995 and 1994,  respectively.  International  sales and  foreign
operations  are subject to inherent  risks,  including  longer  payment  cycles,
greater difficulty in accounts  receivable  collection,  compliance with foreign
laws,   changes  in  regulatory   requirements,   tariffs  or  other   barriers,
difficulties in obtaining  export licenses and in staffing and managing  foreign
operations,   exposure  to  currency   exchange   fluctuations   and   political
instability.  Although  substantially  all the  Company's  sales  and  costs are
negotiated and paid in US dollars,  changes in the values of foreign  currencies
relative to the value of the US dollar can negatively impact international sales
of the Company's products and the Company's foreign operations, as would changes
in the general  economic  conditions  in those  markets.  Although  these risks,
including the risks associated with currency exchange fluctuations, have not had
any material  adverse  effect on the Company to date,  there can be no assurance
that risks inherent in international  sales and foreign operations will not have
a material adverse effect on the Company in the future.

     Control  of  Company.  Upon  completion  of this  offering,  the  Company's
executive  officers  and  directors,  through  their  affiliation  with  certain
stockholders,  may  be  deemed  to  beneficially  own  approximately  39% of the
outstanding  shares  of  Common  Stock.  As a  result,  these  individuals  will
effectively  have the  ability to control the Company and direct its affairs and
business, including the election of all of directors.

     Dividend  Policy.  The Company has never declared or paid cash dividends on
its capital stock. The Company  currently  intends to retain all its earnings to
finance the expansion and development of its business and,  therefore,  does not
anticipate paying any cash dividends in the foreseeable future.

                                       -6-



<PAGE>


                                   THE COMPANY

     The  Company  was  incorporated  in 1970  under  the  laws of the  State of
Delaware.  The  Company's  principal  offices are located at Laurel  Brook Road,
Middlefield, Connecticut 06455-0448, and its telephone number is (203) 347-8506.

                                       -7-



<PAGE>



                              SELLING STOCKHOLDERS

     The  following  table sets  forth  certain  information  as of July 1, 1995
(except as  otherwise  indicated)  and as  adjusted  to reflect  the sale of the
Common  Stock in the  offering,  as to the  security  ownership  of the  Selling
Stockholders.  The  position,  office  or other  material  relationship  which a
Selling  Stockholder has had within the past three years with the Company or any
of its  predecessors  or  affiliates  is indicated in the footnotes or otherwise
under the subheading "Transactions Involving Selling Stockholders" below.

<TABLE>
<CAPTION>
                                                                                                             Percentage of
                                   Shares of                                           Shares of                Class of
                                   Common Stock                                       Common Stock            Common Stock
                                   Beneficially                                       Beneficially            Beneficially
                                   Owned Prior              Shares                    Owned After             Owned After
                                   to Offering              Being Sold                 Offering                Offering
                                   -----------              ----------                 --------                --------

<S>                                   <C>                    <C>                         <C>                    <C>  
Canon, Inc.(1)                        786,000                300,000                     486,000                12.4%
                                                                                     
Wesleyan University(2)                397,500                112,500                     285,000                 7.3%
                                                                                     
Paul F. Forman(3)                     273,060                 75,000                     198,060                 5.0%
                                                                                     
Sol F. Laufer(4)                      213,810                 52,500                     161,310                 4.1%
                                                                                     
Carl A. Zanoni(5)                     289,110                 60,000                     229,110                 5.8%
                                                                                     
Robert G. McKelvey(6)                  53,100                 15,000                      38,100                 1.0%
                                                                             
</TABLE>

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

(1)  Shares of common stock  beneficially  owned prior to and after the offering
     and the  percentage of class of common stock  beneficially  owned after the
     offering  does not include  shares of Common  Stock  beneficially  owned by
     Seymour E. Liebman,  Senior Vice President  Finance and General  Counsel of
     Canon  U.S.A.,  Inc.,  an  affiliate  of Canon Inc.,  and a director of the
     Company.

(2)  Shares of common stock  beneficially  owned prior to and after the offering
     and the  percentage of class of common stock  beneficially  owned after the
     offering  does not include  shares of Common  Stock  beneficially  owned by
     Robert B. Taylor, Vice President and Treasurer of Wesleyan University and a
     director of the Company.

(3)  Shares of common stock  beneficially  owned prior to and after the offering
     and the  percentage of class of common stock  beneficially  owned after the
     offering  includes  39,000  shares of Common Stock which may be acquired by
     Mr. Forman within 60 days of July 1, 1995 upon the exercise of options. Mr.
     Forman  has been a  director  of the  Company  since  1970,  and was  Chief
     Executive Officer from June 1970 to November 1993 and acting President from
     June 1991 to February 1992.

(4)  Shares of common stock  beneficially  owned prior to and after the offering
     and the  percentage of class of common stock  beneficially  owned after the
     offering  includes  45,750  shares of Common Stock which may be acquired by
     Mr. Laufer within 60 days of July 1, 1995 upon the exercise of options. Mr.
     Laufer was Vice President, Optics Group through June 1994.

(5)  Shares of common stock  beneficially  owned prior to and after the offering
     and the  percentage of class of common stock  beneficially  owned after the
     offering  includes  36,450  shares of Common Stock which may be acquired by
     Mr. Zanoni within 60 days of

                                       -8-


<PAGE>



     July 1, 1995 upon the exercise of options.  Mr.  Zanoni has been a director
     of the Company since 1970 and Vice  President,  Research,  Development  and
     Engineering since April 1992.

(6)  Shares of common stock  beneficially  owned prior to and after the offering
     and the  percentage of class of common stock  beneficially  owned after the
     offering includes 7,500 shares of Common Stock which may be acquired by Mr.
     McKelvey  within 60 days of July 1, 1995 upon the exercise of options.  Mr.
     McKelvey has been a director of the Company since 1983.

Transactions Involving Selling Stockholders

     Canon Sales Co.,  Inc.,  a  subsidiary  of Canon,  serves as the  exclusive
distributor of the Company's  products in Japan.  Sales to Canon and Canon Sales
Co., Inc.  aggregated  $9,550,000 and $7,740,000 for the fiscal years ended 1995
and 1994,  respectively.  Selling  prices were based,  generally,  on the normal
terms given to domestic  distributors.  In addition,  the Company and Canon have
entered  into  agreements  providing  for  confidential   exchanges  of  certain
technology.  The Company has received  royalty payments from Canon under certain
of those  agreements,  which payments,  in the aggregate,  are not material.  In
addition,  the  Company  has  entered  into  certain  research  and  development
contracts with Canon, pursuant to which the Company has received funding.

     On June 23, 1995, the Company's Board of Directors approved the purchase of
approximately   22  acres  of  land  adjacent  to  the  Company's   facility  in
Middlefield,  Connecticut, for a purchase price of $440,000. This land, which is
jointly  owned  by Paul F.  Forman,  Sol F.  Laufer  and  Carl A.  Zanoni,  will
facilitate expansion of the Company's buildings and/or parking facilities in the
future.  The  purchase is expected to occur  during the quarter  ended March 31,
1996.

     Canon,  Wesleyan,  and the  group  consisting  of Paul F.  Forman,  Carl A.
Zanoni,  and Sol F. Laufer,  entered into a Stockholders'  Agreement under which
they agreed to vote their shares for the election to the Board of two  directors
designated by each of Canon, Wesleyan University,  and the foregoing individuals
as a group,  and up to five  additional  directors who were to be independent of
the foregoing  stockholders.  On November 30, 1993, the Stockholders'  Agreement
was terminated.

     At  the  time  of  the  termination  of  the  Stockholders'   Agreement,  a
Registration  Rights Agreement was entered into by Canon,  Wesleyan  University,
Paul F. Forman, Carl A. Zanoni, Sol F. Laufer, and the Company. In general,  the
Registration  Rights Agreement  grants to each of these  stockholders the right,
until  November 30, 1998, to have his or its shares of Common Stock  included in
any registered public offering of the Company's securities.  Each of the parties
to the  Registration  Rights  Agreement  has waived  all  rights to include  any
additional  shares  of Common  Stock  owned by such  person in the  Registration
Statement of which this Prospectus is a part.

     In August 1993, the Company entered into a Services  Agreement with each of
Messrs.  Forman and Laufer  providing  for the  retention  of Mr.  Forman or Mr.
Laufer, respectively,  as an executive officer of the Company through the end of
the 1994  fiscal  year and  thereafter  as a  consultant  to the  Company for an
additional five years,  in the case of Mr. Forman,  and an additional four years
in the case of Mr. Laufer. Pursuant to his Agreement, Mr. Forman received salary
payments of $148,271 for the year of employment,  a one-time payment of $149,500
upon his  termination  from active  employment,  and will  continue to receive a
$20,000 retainer for board service for each of the five years of his consultancy

                                       -9-


<PAGE>

plus 80%,  60%,  40%,  and 20% of his salary at June 30,  1994,  for each of the
first through  fourth years of his  consultancy,  respectively.  Pursuant to his
Agreement,  Mr.  Laufer  received  salary  payments of $133,586  for the year of
employment,  a one-time  payment of $135,000 upon his termination of employment,
and will continue to receive payments of 80%, 60%, 40%, and 20% of his salary at
June 30, 1994, for each of the four years of his consultancy, respectively. Each
of the Services  Agreements  further provides that Mr. Forman or Mr. Laufer,  as
the case may be, would have all his outstanding  unvested stock options from the
Company  vested  effective at the  conclusion  of the fiscal year ended June 30,
1994  (options for 20,475  shares of Common Stock in the case of Mr.  Forman and
24,487 shares of Common Stock in the case of Mr.  Laufer,  as of June 30, 1994).
The  Agreements  are  terminable  (with  all  payment   obligations   thereunder
terminating)  by Mr. Forman or Mr. Laufer,  as the case may be, at any time, and
by the Company upon the death or  disability  of Mr. Forman or Mr. Laufer or for
justifiable  cause (as defined in the  Agreements);  except that if an Agreement
terminates as a result of the death or  disability of Mr. Forman or Mr.  Laufer,
he (or his estate)  will be entitled to receive the lesser of twice his June 30,
1994 salary or the aggregate remaining  compensation payments otherwise required
to be made under the Agreement.

                              PLAN OF DISTRIBUTION

     The   Company  is   registering   the  Shares  on  behalf  of  the  Selling
Stockholders.  All costs,  expenses and fees in connection with the registration
of  the  Shares  offered  hereby  will  be  borne  by  the  Company.   Brokerage
commissions,  if any,  attributable  to the sale of Shares  will be borne by the
Selling Stockholders.

     Sales of Shares may be effected  from time to time in  transactions  (which
may  include  block   transactions)  on  the  National  Market,   in  negotiated
transactions,  or a  combination  of such methods of sale, at fixed prices which
may be  changed,  at  market  prices  prevailing  at the  time  of  sale,  or at
negotiated prices.  The Selling  Stockholders have advised the Company that they
have not entered into any agreements,  understandings  or arrangements  with any
underwriters  or  broker-dealers  regarding  the sale of their  securities.  The
Selling  Stockholders  may effect  such  transactions  by selling  Common  Stock
directly to purchasers or to or through  broker-dealers  which may act as agents
or  principals.  Such  broker-dealers  may receive  compensation  in the form of
discounts,  concessions,  or commissions from the Selling Stockholder and/or the
purchasers of Common Stock for whom such  broker-dealers may act as agents or to
whom they sell as  principal,  or both (which  compensation  as to a  particular
broker-dealer  might  be  in  excess  of  customary  commissions).  The  Selling
Stockholders and any broker-dealers  that act in connection with the sale of the
Common Stock might be deemed to be "underwriters"  within the meaning of Section
2(11) of the Securities  Act and any commission  received by them and any profit
on the resale of the shares of Common Stock as  principal  might be deemed to be
underwriting  discounts and  commissions  under the Securities  Act. The Selling
Stockholders  may agree to indemnify  any agent,  dealer or  broker-dealer  that
participates  in  transactions  involving  sales  of  the shares against certain

                                      -10-

<PAGE>


liabilities, including liabilities arising under the Securities Act.

     Because the Selling Stockholders may be deemed to be "underwriters"  within
the meaning of Section  2(11) of the  Securities  Act, the Selling  Stockholders
will be subject to prospectus  delivery  requirements  under the Securities Act.
Furthermore,  in the  event of a  "distribution"  of the  shares,  such  Selling
Stockholder, any selling broker or dealer and any "affiliated purchasers" may be
subject to Rule 10b-6 under the  Securities  Exchange  Act of 1934,  as amended,
which Rule would prohibit, with certain exceptions, any such person from bidding
for or purchasing any security which is the subject of such  distribution  until
his  participation in that  distribution is completed.  In addition,  Rule 10b-7
under the Exchange Act prohibits any "stabilizing bid" or "stabilizing purchase"
for the purpose of pegging,  fixing or stabilizing  the price of Common Stock in
connection with this offering.

     Each of the  Selling  Stockholders  has  agreed  with the  Company  not to,
directly or  indirectly,  offer,  sell,  grant any option to buy,  or  otherwise
dispose of any shares of Common Stock owned by such Selling  Stockholder  (other
than shares of Common Stock included herein),  for a period of 180 days from the
date of the  Registration  Statement of which this Prospectus is a part is filed
with the Commission, without the prior written consent of the Company.

     The Company will not receive any of the proceeds from the sale of shares of
Common Stock by the Selling Stockholders.

                                  LEGAL MATTERS

     Certain  legal  matters  with  respect to the  validity of the Common Stock
offered  hereby have been  passed  upon for the Company by  Fulbright & Jaworski
L.L.P.,  New York, New York.  Paul Jacobs,  a partner in the firm of Fulbright &
Jaworski  L.L.P.,  is  Secretary  of  the  Company  and,  as of  July  1,  1995,
beneficially  owned less than one  percent of the  outstanding  shares of Common
Stock.

                                     EXPERTS

     The  consolidated  financial  statements and schedules of the Company as of
June 30, 1994 and 1993 and for each of the years in the three-year  period ended
June 30, 1994, have been incorporated by reference in this Prospectus and in the
Registration  Statement  in reliance  upon the reports of KPMG Peat Marwick LLP,
independent certified public accountants,  incorporated by reference herein, and
upon the  authority  of said firm as experts in  accounting  and  auditing.  Our
reports refer to a change in the Company's  method of accounting for investments
in 1994 and a change in the Company's  method of accounting  for income taxes in
1993.

                                      -11-


<PAGE>



     
================================================================================

     No person is authorized in connection with any offering made hereby to give
any information or to make any representation not contained in this Prospectus,
and, if given or made, such information or representation must not be relied
upon as having been authorized by the Company, any Selling Stockholder or any
other person. This Prospectus does not constitute an offer to sell or a
solicitation of an offer to buy any security other than the Common Stock offered
hereby, nor does it constitute an offer to sell or a solicitation of an offer to
buy any of the securities offered hereby to any person in any jurisdiction in
which it is unlawful to make such an offer or solicitation. Neither the delivery
of this Prospectus nor any sale made hereunder shall under any circumstances
create any implication that the information contained herein is correct as of
any date subsequent to the date hereof.

                                TABLE OF CONTENTS

                                                                           Page
                                                                           ----
Available Information .......................................................  2
Incorporation of Certain
 Documents by Reference .....................................................  2
Risk Factors.................................................................  4
The Company..................................................................  7
Selling Stockholders.........................................................  8
Plan of Distribution......................................................... 10
Legal Matters ............................................................... 11
Experts ..................................................................... 11

================================================================================




================================================================================


                                    615,000

                                    Shares

                               ZYGO CORPORATION

                                 Common Stock

                                  ----------
                                  PROSPECTUS

                                  ----------
                                August 24, 1995

 
================================================================================

<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.   Other Expenses of Issuance and Distribution.

     The  following  is an itemized  statement of the  estimated  amounts of all
expenses  payable by the Registrant in connection  with the  registration of the
Shares:

     Registration Fee--Securities and Exchange Commission..........  $ 5,700
     Legal and Accounting fees and expenses........................  $17,000*
     Printing and offset expenses..................................  $ 1,000*
     Miscellaneous.................................................  $ 1,300*
                                                                     -------
                  Total............................................  $25,000*
                                                                     =======

-------------------
*estimate

ITEM 15.   Indemnification of Directors and Officers.

     Section 145 of the General Corporation Law of the State of Delaware permits
indemnification  of directors,  officers and  employees of a  corporation  under
certain  conditions  and subject to certain  limitations.  Article Eighth of the
Company's  Articles of Incorporation and Section 4 of the By-laws of the Company
contain provisions for the indemnification of directors,  officers and employees
within  the  limitations  permitted  by Section  145.  In  addition,  subject to
receiving  stockholder  approval,  the Company  proposes to enter into Indemnity
Agreements   with  its  directors   and  officers   providing  for  the  maximum
indemnification allowed by Section 145.

ITEM 16.   Exhibits.

5        -   Opinion of Fulbright & Jaworski L.L.P.
23.1     -   Consent of KPMG Peat Marwick LLP
23.2     -   Consent of Fulbright & Jaworski L.L.P. (included in Exhibit 5).
24       -   Power of Attorney (included on signature page).

ITEM 17.   Undertakings.

     (a) The undersigned registrant hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
post-effective amendment of this registration statement:

                                      II-1

<PAGE>


          (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;

          (iii) To include any material  information with respect to the plan of
distribution  not  previously  disclosed  in the  registration  statement of any
material change to such information in the registration statement;

     Provided, however, that paragraphs (a)(l)(i) and (a)(l)(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 by the registrant  pursuant to
Section  13 or Section  15(d) of the  Securities  Exchange  Act of 1934 that are
incorporated by reference in the registration statement.

     (2) That, for the purpose of determining any liability under the Securities
Act of 1933,  each  such  post-effective  amendment  shall be deemed to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (3) To remove from registration by means of a post-effective  amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (b) The  undersigned  registrant  hereby  undertakes  that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Securities  Exchange  Act of  1934  that is  incorporated  by  reference  in the
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  provisions  described  under Item 15 above,  or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission such  indemnification is against public policy 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.

                                      II-2


<PAGE>


                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Middlefield, State of Connecticut on August 21, 1995.

                                   Zygo Corporation

                                   By: /s/ Gary K. Willis
                                      -----------------------------------------
                                          (Gary K. Willis, President and Chief
                                          Executive Officer)

                                POWER OF ATTORNEY

     KNOW  ALL MEN BY THESE  PRESENTS,  that  each  individual  whose  signature
appears below and on the following page constitutes and appoints each of Gary K.
Willis  and Mark J.  Bonney as his true and lawful  attorney-in-fact  and agent,
each acting alone, with full power of substitution and  resubstitution,  for him
and in his name, place and stead, in any and all capacities, to sign any and all
amendments to this Registration Statement,  including post-effective amendments,
and to file the same, with all exhibits thereto, and all documents in connection
therewith, with the Securities and Exchange Commission,  granting unto each said
attorney-in-fact  and agent full power and  authority to do and perform each and
every  act and  thing  requisite  and  necessary  to be done  in and  about  the
premises,  as  fully  to all  intents  and  purposes  as he might or could do in
person, and hereby ratifies and confirms all that any said  attorney-in-fact and
agent,  each acting alone, or his substitute or substitutes,  may lawfully do or
cause to be done by virtue hereof.

     Pursuant to the  requirements  of the  Securities  Act of 1933, as amended,
this  registration  statement has been signed below by the following  persons in
the capacities and on the dates indicated.

<TABLE>
<CAPTION>
Signature                                   Title                              Date
---------                                   -----                              ----

<S>                                  <C>                                 <C> 
/s/ Gary K. Willis                   President, Chief                    August 21, 1995
------------------                   Executive Officer and
(Gary K. Willis)                     Director (Principal
                                     Executive Officer)

/s/ Mark J. Bonney                   Vice President, Finance             August 21, 1995
------------------                   & Administration (Principal
(Mark J. Bonney)                     Financial and Accounting Officer)
</TABLE>
                                     

                                      II-3

<PAGE>



<TABLE>
<CAPTION>

<S>                                  <C>                                <C> 
/s/ Paul F. Forman                   Chairman of the Board               August 21, 1995
------------------
(Paul F. Forman)



/s/ Michael R. Corboy                         Director                   August 21, 1995
---------------------
(Michael R. Corboy)



/s/ Seymour E. Liebman                        Director                   August 21, 1995
----------------------
(Seymour E. Liebman)



/s/ Robert G. McKelvey                        Director                   August 21, 1995
----------------------
(Robert G. McKelvey)



                                              Director                   August __, 1995
-------------------
(Paul W. Murrill)



/s/ Robert B. Taylor                          Director                   August 21, 1995
--------------------
(Robert B. Taylor)



/s/ Carl A. Zanoni                            Director                   August 21, 1995
------------------
(Carl A. Zanoni)

</TABLE>


                                      II-4

<PAGE>



                                INDEX TO EXHIBITS

 Exhibit No.                       Description                        Page No.
 ----------                        -----------                        --------

    5                Opinion of Fulbright & Jaworski L.L.P.              1

   23.1              Consent of KPMG Peat Marwick LLP                    3

   23.2              Consent of Fulbright & Jaworski L.L.P. 
                      (included in Exhibit 5).

   24                Power of Attorney (see signature page).






                                                                     EXHIBIT 5


                              FULBRIGHT & JAWORSKI
                                     L.L.P.
                   A Registered Limited Liability Partnership
                                666 Fifth Avenue
                         New York, New York 10103-3198


                                                                 August 23, 1995

Zygo Corporation
Laurel Brook Road
Middlefield, Connecticut 06455

Dear Sirs:

     We  refer to the  Registration  Statement  on Form  S-3 (the  "Registration
Statement"),  filed by Zygo  Corporation  (the  "Company")  on behalf of certain
selling  stockholders  (the  "Selling  Stockholders")  with the  Securities  and
Exchange  Commission  under the  Securities Act of 1933, as amended (the "Act"),
relating to 615,000 shares of the Company's  Common Stock,  $0.10 par value (the
"Shares"), to be sold by the Selling Stockholders.

     As counsel  for the  Company,  we have  examined  such  corporate  records,
documents  and  such  questions  of  law  as we  have  considered  necessary  or
appropriate  for the  purpose  of this  opinion  and,  upon  the  basis  of such
examination, advise you that in our opinion the Shares to be sold by the Selling
Stockholders  have been duly and validly  authorized,  have been legally issued,
and are fully paid and nonassessable.

     We consent to the filing of this opinion as an exhibit to the  Registration
Statement  and the reference to this firm under the caption  "Legal  Matters" in
the prospectus contained therein and elsewhere in the Registration Statement and
prospectus.  This consent is not to be  construed as an admission  that we are a
party  whose  consent is required  to be filed with the  Registration  Statement
under the provisions of the Securities Act of 1933, as amended.

                                             Very truly yours,

                                             /s/Fulbright & Jaworski L.L.P.




                                                                    EXHIBIT 23.1
                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors
Zygo Corporation

We consent to incorporation  by reference in the Registration  Statement on Form
S-3 of Zygo  Corporation  of our reports dated August 12, 1994,  relating to the
consolidated  balance sheets of Zygo Corporation and consolidated  subsidiary as
of June 30, 1994 and 1993 and the related  consolidated  statements of earnings,
stockholders'  equity and cash flows and related schedules for each of the years
in the  three-year  period ended June 30, 1994,  which reports  appear in or are
incorporated  by reference  into the June 30, 1994 annual report on Form 10-K of
Zygo Corporation and to the reference to our firm under the heading "Experts" in
the prospectus.

Our  reports  refer  to a change  in the  Company's  method  of  accounting  for
investments  in 1994 and a change  in the  Company's  method of  accounting  for
income taxes in 1993.

                                                     KPMG PEAT MARWICK LLP

Hartford, Connecticut
August 23, 1995





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