ONIX SYSTEMS INC
POS AM, 1999-03-30
MEASURING & CONTROLLING DEVICES, NEC
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As filed with the Securities and Exchange Commission on
March 29, 1999                  ___    Registration No. 333-59973

                      SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC 20549
                       -------------------------------

                        POST-EFFECTIVE AMENDMENT NO. 1
                           ON FORM S-3 TO FORM S-1
                            Registration Statement
                       Under the Securities Act of 1933
                       --------------------------------

                              ONIX SYSTEMS INC.
            (Exact name of registrant as specified in its charter)

                 Delaware                              76-0546330
     (State or other jurisdiction of                (I.R.S. Employer
      incorporation or organization)               Identification No.)


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

                            22001 North Park Drive
                              Kingwood, TX 77339
                                (781) 622-1000
        (Address, including zip code, and telephone number, including area code,
           of registrant's principal executive offices)
                               ---------------

                         Sandra L. Lambert, Secretary
                              ONIX Systems Inc.
                       c/o Thermo Electron Corporation
                               81 Wyman Street
                                P.O. Box 9046
                      Waltham, Massachusetts 02454-9046
                                (781) 622-1000
          (Name, address, including zip code, and telephone number,
                  including area code, of agent for service)
                               ---------------

                                   Copy to:
                            Seth H. Hoogasian, Esq.
                               General Counsel
                              ONIX Systems Inc.
                       c/o Thermo Electron Corporation
                               81 Wyman Street
                                P.O. Box 9046
                      Waltham, Massachusetts 02454-9046
                                (781) 622-1000
                               ---------------

      Approximate date of commencement of proposed sale to the public: From time
to time after the effective date of this registration statement.

<PAGE>


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

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

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

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

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




<PAGE>


                 SUBJECT TO COMPLETION, DATED MARCH 29, 1999

                                  PROSPECTUS
                               1,639,640 Shares

                              ONIX SYSTEMS INC.

                                 Common Stock

      This Prospectus relates to the resale of 1,639,640 shares of Common Stock,
par value $.01 per share,  of ONIX Systems Inc. by certain  shareholders  of the
Company.  The  Shares may be offered  from time to time in  transactions  on the
American Stock Exchange, Inc., in negotiated  transactions,  through the writing
of options on the Shares,  or a  combination  of such methods of sale,  at fixed
prices that may be changed,  at market prices prevailing at the time of sale, at
prices related to such prevailing  market prices or at negotiated  prices.  Such
transactions may be effected by the sale of Shares to or through broker-dealers,
and such  broker-dealers  may  receive  compensation  in the form of  discounts,
concessions or commissions  from the sellers and/or the purchasers of the Shares
for whom such broker-dealers may act as agent or to whom they sell as principal,
or both (which compensation to a particular  broker-dealer might be in excess of
customary commissions).  The Selling Shareholders and any broker-dealer who acts
in  connection  with  the  sale  of  Shares   hereunder  may  be  deemed  to  be
"underwriters"  as that  term is  defined  in the  Securities  Act of  1933,  as
amended,  and any  commissions  received by them and profit on any resale of the
Shares as principal might be deemed to be underwriting discounts and commissions
under the  Securities  Act.  The Shares were  originally  sold by the Company in
private  placements  pursuant  to certain  Stock  Purchase  Agreements  with the
Company  dated   September   24,  1997  and  October  22,  1997.   See  "Selling
Shareholders".

      See "RISK FACTORS" beginning on page 5 for certain information that should
be considered by prospective investors.

      Neither the  Securities and Exchange  Commission nor any state  securities
commission has approved or  disapproved  of these  securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.

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

     The Company is a  majority-owned  subsidiary of Thermo  Instrument  Systems
Inc., which is a majority-owned  subsidiary of Thermo Electron Corporation.  The
Common Stock is traded on the

<PAGE>




American Stock Exchange under the symbol "ONX".  On March 26, 1999, the reported
closing price of the Common Stock on the American  Stock Exchange was $5.625 per
share.

      The date of this Prospectus is         , 1999.

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

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

<PAGE>



                            AVAILABLE INFORMATION

      ONIX  Systems  Inc.   ("ONIX"  or  the   "Company")   is  subject  to  the
informational  requirements  of the Securities  Exchange Act of 1934, as amended
(the "Exchange Act"), and accordingly files reports,  proxy statements and other
information with the Securities and Exchange  Commission (the "SEC"). The public
may read and copy any  materials  filed by the Company with the SEC at the SEC's
Public Reference Room at 450 Fifth Street, N.W., Washington,  D.C. 20549, and at
the following Regional Offices of the SEC: 500 West Madison Street,  Suite 1400,
Chicago,  Illinois  60661,  and 7 World Trade Center,  Suite 1300, New York, New
York 10048.  The public may obtain  information  on the  operation of the Public
Reference  Room by  calling  the SEC at  1-800-SEC-0330.  In  addition,  the SEC
maintains an Internet  site at  www.sec.gov  that  contains  reports,  proxy and
information  statements,  and  other  information  regarding  issuers  that file
electronically  with the SEC, such as the Company.  The common stock,  par value
$.01 per share (the  "Common  Stock") of the  Company is listed on the  American
Stock Exchange, and the reports, proxy statements and other information filed by
the Company with the SEC can be  inspected at the offices of the American  Stock
Exchange, 86 Trinity Place, New York, New York 10006.

      This Prospectus,  which constitutes part of a Registration Statement filed
by the Company with the SEC under the  Securities  Act of 1933,  as amended (the
"Securities   Act"),   omits  certain  of  the  information   contained  in  the
Registration  Statement.  Reference is hereby made to the Registration Statement
and to the exhibits relating thereto for further information with respect to the
Company and the shares (the "Shares") of Common Stock offered hereby. Statements
contained herein concerning provisions of documents are necessarily summaries of
such documents,  and each statement is qualified in its entirety by reference to
the applicable document filed with the SEC.

      The Company will provide  without  charge to each person to whom a copy of
this  Prospectus  has been  delivered,  on the  written or oral  request of such
person,  a  copy  of  the  Registration   Statement  of  which  this  Prospectus
constitutes  a part and any or all of the  documents  that  have  been or may be
incorporated in this Prospectus by reference. Requests for such copies should be
directed  to:  Sandra L.  Lambert,  Secretary,  ONIX  Systems  Inc.,  c/o Thermo
Electron  Corporation,  81 Wyman Street, P. O. Box 9046, Waltham,  Massachusetts
02454-9046 (telephone: (781) 622-1000).


<PAGE>



                                 THE COMPANY

      The Company designs,  develops,  markets and services  sophisticated field
measurement  instruments and on-line  sensors for the process control  industry.
Incorporating advanced measurement technologies,  the Company's products provide
real-time  data  collection,  analysis  and local  control  functions to enhance
production  efficiency,  improve process and quality control,  ensure regulatory
compliance and increase employee safety in industries where production processes
require continuous monitoring,  analysis and measurement. The Company's products
and services are offered through two segments:  Measurement  Instruments,  which
serve  the  process  analysis  and  measurement  needs  of a  range  of  process
industries,  and  Industry-specific  Systems,  which are  developed  to meet the
specific  process analysis needs of select  industries,  principally oil and gas
producers.  The Company operated as a division of Thermo Instrument Systems Inc.
("Thermo  Instrument")  until its  incorporation  as a Delaware  corporation  in
August 1997. In connection with the Company's  incorporation,  Thermo Instrument
transferred to the Company the stock of certain of its  subsidiaries,  including
CAC Inc., CAC Limited,  Flow Automation  Inc., Flow Automation (UK) Limited,  TN
Technologies Inc., Kay-Ray/Sensall Inc., Houston Atlas Inc., Westronics Inc. and
VG Gas Analysis Systems Inc., in exchange for 10,666,667 shares of the Company's
Common  Stock.  Unless  the  context  otherwise  requires,  references  in  this
Prospectus  to  the  Company  or  ONIX  refer  to  ONIX  Systems  Inc.  and  its
subsidiaries and the predecessor businesses that constitute the Company.

      As of January 31, 1999, Thermo  Instrument owned  approximately 80% of the
Company's  outstanding  Common Stock and Thermo  Electron  Corporation  ("Thermo
Electron") owned approximately 2% of the Company's outstanding Common Stock. The
Company's  principal  executive  offices  are located at 22001 North Park Drive,
Kingwood, Texas 77339, and its telephone number is (781) 622-1000.


<PAGE>



                                 RISK FACTORS

      In connection with the "safe harbor"  provisions of the Private Securities
Litigation  Reform Act of 1995,  the Company  cautions  readers that the matters
described  in this  section,  among  others,  have in the past and  could in the
future   affect  its  actual   results  of   operations.   The   Company   makes
forward-looking  statements,  within the meaning of Section 21E of the  Exchange
Act,  throughout  this  Prospectus.   Readers  should  consider  any  statements
contained in this Prospectus that are not historical,  factual  statements to be
forward-looking  statements.   Among  others,  the  Company  intends  the  words
"believes,"  "anticipates," "plans," "expects," "seeks," "estimates" and similar
expressions to identify forward-looking statements. Many important factors could
cause the Company's  results to differ  materially from the results indicated by
any forward-looking statements.  Those factors include factors discussed in this
section and those discussed in other sections of this Prospectus.

      Dependence  on Oil and Gas Industry.  Historically,  much of the Company's
total  revenues  have  come from  sales of  products  and  related  services  to
customers in the oil and gas industry.  In 1998, oil and gas industry  customers
accounted for approximately 67% of the Company's total revenues.  Demand for the
Company's  products and services from oil and gas industry  customers depends on
how  much  those   customers  are  spending  on   exploration,   production  and
distribution activities.  Those activities depend in part on oil and gas prices,
expectations  about future  prices,  the cost of exploring  for,  producing  and
delivering  oil and gas, the discovery  rate of new oil and gas reserves,  local
and international political,  regulatory and economic conditions and the ability
of oil and gas companies to obtain capital.  The Company makes no assurance that
the current  level of activity by oil and gas  companies  and the demand for the
Company's  products and services  will not change.  Decreases in activity by oil
and gas companies could have a significant  adverse effect on the demand for the
Company's products and related services, which would materially adversely affect
the Company's business, financial condition and results of operations.

      Risk of  Limited  or No Market  Acceptance  of New  Products.  Some of the
Company's  products are  alternatives  to traditional  instruments  and methods.
Consequently,  it may take some length of time and additional  demonstrations of
effectiveness  before customers accept the Company's products and are willing to
invest in them,  particularly  where the purchase of the product would require a
major investment.  The Company's on-line process measurement  instruments become
part of a customer's  production  line.  Accordingly,  the decision to invest in
these instruments is risky in that the failure of one of these instruments could
affect an entire  production  line. In addition,  the Company  believes that its
growth  prospects  depend  heavily on the acceptance of its products and related
services by more customers from different industry  segments.  The Company makes
no assurance that it will obtain broad acceptance of its products.

<PAGE>

      Dependence  on  Customers'  Capital  Spending   Policies.   The  Company's
customers include oil and gas production,  processing, refining and distribution
facilities,  and iron and steel, pulp and paper,  minerals and mining, water and
wastewater, semiconductor, and petrochemical and chemical companies. The capital
spending  policies of the Company's  customers can have a significant  effect on
the demand for the Company's  products.  Capital spending  policies are based on
many things,  including the  resources  available  for  purchases,  the spending
priorities  among various types of process  control  equipment or techniques and
policies regarding capital spending during  recessions.  Any decrease in capital
spending  by  these  customers  could  have a  material  adverse  effect  on the
Company's business, financial condition and results of operations.

      No  Assurance of a Successful  Acquisition  Strategy.  The Company has, as
part of its strategy, acquired businesses that complement or add to its existing
product lines.  Attractive  acquisitions  are difficult to identify and complete
for a number of reasons,  including competition among prospective buyers and the
need for regulatory  approvals,  including antitrust approvals.  The Company may
pay a substantial  premium over the fair value of the net assets of any acquired
companies. The Company may not be able to complete future acquisitions,  and the
Company may not be able to successfully  integrate any acquired  businesses into
its existing  business.  In addition,  the Company may not be able to retain key
personnel and customers, or adequately improve the financial performance, of any
acquired business. In order to finance any acquisitions, the Company may have to
raise  funds by selling its  securities  in the public or private  markets.  The
Company may not be able to obtain the necessary financing at all or on favorable
terms.   Any  equity   financing   may  result  in  dilution  to  the  Company's
stockholders.

      Risks Associated with International  Sales.  Sales originating  outside of
the United  States and export  revenues  from the United  States  accounted  for
approximately  17% and 27%,  respectively,  of the Company's  total  revenues in
1998. The Company intends to continue  expanding its presence in markets outside
of the United States.  International  revenues are subject to a number of risks,
however,  including the  following:  agreements  may be difficult to enforce and
receivables  difficult  to collect  through a foreign  country's  legal  system;
foreign  customers may have longer payment cycles;  foreign countries may impose
additional withholding or other taxes on the Company's foreign income and impose
tariffs or adopt other restrictions on foreign trade;  changes in exchange rates
may adversely  affect both product demand and the  profitability of products and
services  sold abroad when payment is made in the local  currency;  U.S.  export
licenses may be difficult to obtain or enforce; and intellectual property rights
in foreign countries may be more difficult to enforce. In addition,  the Company
conducts a large portion of its business in, and exports to, foreign  countries,
including  the United  Kingdom,  Mexico,  Canada and the United  Arab  Emirates.
Foreign  operations  have  associated  risks,   including  potentially  unstable
economic  conditions,  the need to comply  with a variety  of  foreign  laws and
regulations,  which may change without notice, and different tax structures. Tax

<PAGE>

rates in certain foreign countries are greater than United States tax rates, and
foreign earnings may be subject to withholding  requirements,  tariffs, exchange
controls or other restrictions. The Company makes no assurance that any of these
or other  factors  will not have a  material  adverse  effect  on the  Company's
business, financial condition and results of operations.

      Technological  Change  and New  Products.  Changing  technology,  evolving
industry standards and new product  introductions and enhancements are hallmarks
of the markets in which the Company's products compete. In order to succeed, the
Company must enhance its existing  products,  develop and introduce new products
and  technologies  and expand its  aftermarket  support  services for its new or
enhanced  products in order to meet  changing  customer  requirements  and serve
broader  industry  segments.  The  Company  is  currently  devoting  significant
resources   to  enhance  its  existing   products,   develop  new  products  and
technologies  and expand its  preventive  maintenance  and  aftermarket  support
activities.  The Company makes no assurance,  however, that it will successfully
and timely  complete the  enhancement  and development of these products and the
expansion  of its  services or that its current or future  products and services
will satisfy the process  measurement  needs of  participants  in the  Company's
targeted markets.

      Intense  Competition.  The Company  encounters  and expects to continue to
encounter intense competition in the sale of its products.  The Company believes
that its  competitiveness  in the market for field  measurement  instruments and
sensors  depends  upon a number of factors  both within and beyond its  control,
including quality and reliability;  technical features;  accuracy;  ease of use;
product  pricing;  reputation  for  aftermarket  service;  timing of new product
releases and enhancements by the Company and its competitors;  name recognition;
the  establishment  of strategic  alliances;  and industry and general  economic
trends. In addition, some of the Company's competitors use technologies that may
be  viewed  as  cost-effective  alternatives  to the  technologies  used  in the
Company's products.  Certain of the Company's current and potential  competitors
have significantly greater financial, marketing, technical and other competitive
resources,  as well as greater name recognition,  than the Company. As a result,
the Company's  competitors  may be able to adapt more quickly to new or emerging
technologies  and  changes in customer  requirements,  and may be able to devote
greater resources to promoting and selling their products.  The Company makes no
assurance  that it will be able to compete  successfully  with  existing  or new
competitors.  An increase in  competition  could result in price  reductions and
loss of  market  share,  which  could  have a  material  adverse  effect  on the
Company's business, financial condition or results of operations.

      Risks  of  Gamma  Technology.  Some of the  Company's  level  and  density
measurement  instruments  use gamma  technologies  that may  involve  health and
safety  risks as a result of the use and  handling of and  possible  radioactive
emissions  from gamma  materials.  The Company  believes  that it  conducts  its
operations,  including those involving gamma technology,  prudently. The Company

<PAGE>

has insurance  policies covering both general liability and nuclear liability in
amounts it believes to be commercially reasonable. However, the Company makes no
assurance that this insurance will protect the Company from liability claims, or
that  liability  insurance  will  continue to be  available  to the Company at a
reasonable  cost, or at all. In addition,  the  manufacture and sale of products
that use gamma technology may subject the Company to extensive  federal,  state,
local and foreign  regulations.  These  regulations could make production of the
Company's  products more  expensive,  or could  otherwise  materially  adversely
affect the demand for the Company's gamma measurement instruments.

      Limited Sources of Supply. Local subcontractors  manufacture certain major
components  that  the  Company  uses  in  its  products.  The  Company  has  not
experienced any significant disruption or delay in obtaining required components
for its products, and believes that it could develop other sources of supply for
these  components.  However,  if the  Company  was  unable to  receive  adequate
supplies for a long time, the Company might have to pay more for its supplies or
find another  source for those  supplies,  which could delay  shipments and hurt
relationships with current and prospective customers.  Such factors could have a
material  adverse  effect on the  Company's  business,  financial  condition and
results of operations.

      Dependence on Key Personnel.  The Company's  success  depends greatly on a
number of key employees, including members of senior management. The loss of the
services  of one or more of these key  employees  could have a material  adverse
effect on the Company.  The Company does not have employment  contracts with any
of its key  employees,  and the  Company  does not  have,  or plan to  purchase,
key-man life insurance policies for any key employee.  The Company believes that
its future  success will depend in part on its ability to attract,  motivate and
retain highly skilled technical, managerial and marketing personnel. Competition
for such  personnel is intense,  and the Company makes no assurance that it will
be able to attract, motivate and retain key personnel.

      Uncertain  Protection of  Proprietary  Rights.  The Company's  proprietary
rights relating to the Company's products are protected from unauthorized use by
third parties only to the extent that they are covered by valid and  enforceable
patents or are  maintained  in  confidence  as trade  secrets.  The  Company has
received several U.S. patents and has several pending patent  applications.  The
Company also owns corresponding patents in other countries. The Company makes no
assurance  that any patents it owns now or in the future will protect it against
competitors. Legal proceedings brought by the Company to protect its proprietary
rights could be extremely  expensive.  In addition,  competitors of the Company,
some of whom have  substantially  greater  resources than the Company has, could
bring  lawsuits to challenge  the validity of the  Company's  patents,  or could
design comparable products that do not infringe the Company's patents. Defending
those claims could be very  expensive  and divert  management  resources,  which
could  have a  material  adverse  effect on the  Company's  business,  financial

<PAGE>

condition and results of operations.  Also, such claims could result in an award
of  substantial  damages  against the Company,  as well as  injunctive  or other
equitable  relief,  that could  effectively block the Company's ability to make,
use,  sell,  distribute  or market its  products  and  services in the U.S.  and
abroad.

      Other parties may own pending or issued patents  relating to the Company's
products or  technologies.  If those  parties were to bring a claim  relating to
proprietary  technology or  information  against the Company,  the Company might
need to  acquire  licenses  to,  or  contest  the  validity  of,  such  parties'
proprietary  technology.  Any contest of the validity of proprietary  technology
would  likely be very  expensive,  and the  Company  may not prevail in any such
contest. In addition,  any license required under any other parties' proprietary
technology  might not be available on acceptable  terms.  The steps taken by the
Company to protect its proprietary  rights may not be adequate to prevent others
from  misappropriating  its  technology or  developing  similar  technology.  In
addition,  some jurisdictions' laws would not protect the Company's  proprietary
rights to the same extent as U.S. laws, and the  protections  that are available
in other jurisdictions may not be adequate.

      The Company also relies on trade secrets and proprietary  know-how that it
seeks to protect, in part, by confidentiality  agreements with its employees and
consultants.  The Company makes no assurance that these  agreements  will not be
breached,  that the Company will have  adequate  remedies for any breach or that
the Company's trade secrets will not otherwise  become known to or independently
developed by its competitors.

      Risk  of  Failure  to  Obtain  or  Maintain  Government   Regulations  and
Approvals.  Various domestic and foreign  environmental and consumer  protection
laws  influence  the demand for certain of the Company's  products,  both in the
United  States and  abroad.  The  Company  designs,  develops  and  markets  its
products,  in part, to meet customer  needs created by existing and  anticipated
regulations.  Any changes in these  regulations may adversely  affect demand for
the Company's products.  In addition,  the manufacture and sale of products that
use gamma  technology is subject to certain  federal,  state,  local and foreign
regulations,  including licensing and other regulatory approvals. In particular,
the Company has obtained licenses required by the Nuclear Regulatory  Commission
("NRC")  and the State of Texas for the  storage  and  handling  of the  nuclear
sources  used in its gamma  measurement  instruments  located at its Round Rock,
Texas  facility.  These licenses are reviewed and renewed  periodically  and the
facility is subject to periodic inspection. Further, the NRC or other regulators
may adopt and impose new or more stringent regulations, and the Company makes no
assurance  that it will be able to  comply  with  such  changes.  The  Company's
failure to maintain its licenses or to comply with applicable  regulations could
have a material adverse effect on the Company's  business,  financial  condition
and results of operations.

<PAGE>

      Potential Impact of Year 2000 on Processing of Date-Sensitive Information.
The Company is attempting to minimize any negative consequences arising from the
year 2000 issue. However, the Company makes no assurance that year 2000 problems
will not have a material adverse impact on the Company's business, operations or
financial condition. While the Company expects that it will complete upgrades to
its internal  business systems on time, these upgrades may encounter  unexpected
costs or  delays.  Despite  its  efforts  to ensure  that its  material  current
products  are year 2000  compliant,  the Company may see an increase in warranty
and other claims related to Company products that incorporate or use third party
software or hardware. The Company might also be materially adversely affected if
any of the  operations  of the  Company's  material  suppliers  or  vendors  are
disrupted  by year 2000  issues.  The Company  expects a  significant  amount of
litigation  relating to the year 2000 issue,  and the Company makes no assurance
that it will not incur material costs in defending or bringing year 2000-related
lawsuits.  In addition,  if the Company does identify any year 2000 issues,  the
Company may not be able to hire qualified  personnel to remedy those issues. Any
unexpected  costs or  delays  arising  from the year  2000  issue  could  have a
significant adverse impact on the Company's  business,  operations and financial
condition in amounts that the Company cannot reasonably estimate at this time.



<PAGE>




                             SELLING SHAREHOLDERS

      The following  table sets forth the names of certain  shareholders  of the
Company  (each,  a  "Selling   Shareholder"  and   collectively,   the  "Selling
Shareholders"),  the number of Shares  owned by each  Selling  Shareholder,  the
number of Shares  that may be offered by each  Selling  Shareholder  pursuant to
this  Prospectus,  and the number of Shares each  Selling  Shareholder  will own
after  completion  of the  offering,  assuming all of the Shares  being  offered
hereby are sold.


<TABLE>
<CAPTION>
<S>                                               <C>            <C>          <C>    
                                                    Shares of                     Shares
                                                   Common Stock                Owned After
                                                    Owned Prior                Completion
                                                      to the      Shares          of the
                                                     Offering(1)   Being         Offering
Selling Shareholder                                               Offered
- -------------------                                  -----------   ------       ------------        


W. Paul Ruben                                           3,508       3,508            0

Gregory D. Lewis (2)                                      333         333            0

Earl R. Lewis IV (2)                                      333         333            0

The Lincoln Fund Tax Advantage L.P.                    12,280      12,280            0

The Gordon Fund, L.P.                                  12,280      12,280            0

Steven Braverman Trust                                  7,018       7,018            0

Nutraco Nominees Limited                               70,333      70,333            0

Advance Capital Offshore Partners, L.P                 80,553      26,836       53,717

Catherine S. Dawson                                     3,508       3,508            0

Richard J. Naegele                                      7,018       7,018            0

Lucky Star Shipping S.A.                               40,350      40,350            0

Pictet & Cie                                           17,544      17,544            0

Nancy S. DeMoss                                         3,508       3,508            0

Roger T. Servison                                       7,017       7,017            0

Joseph C. Sindelar Trust                                8,140       8,140            0

Stephenson Ventures                                     8,772       8,772            0
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
<S>                                                    <C>           <C>           <C>   
                                                    Shares of                   Shares
                                                    Common Stock              Owned After
                                                    Owned Prior                Completion
                                                       to the       Shares      of the
                                                     Offering(1)     Being      Offering
Selling Shareholder                                                 Offered
- -------------------                                  -----------     ------    ------------        
H. Virgil Sherrill                                      8,772       8,772            0

Arthur S. DeMoss Foundation                             8,771       8,771            0

Edward Darman Co.                                      10,526      10,526            0

Wynona L. Smith (3)                                     4,000       4,000            0

Roy F. Weston                                           3,508       3,508            0

Lazard Freres & Co. LLC                                20,000      20,000            0

Coutts(Jersey) Limited a/c AIM Values                  15,333      15,333            0

Coutts(Jersey) Limited a/c Client                      18,000      18,000            0

Royal Bank of Scotland International                   32,666      32,666            0

Coutts(Jersey) Limited a/c AIM Americas                   666         666            0

Nutraco Nominees Limited                               43,000      43,000            0

Homeowners Friendly Society Ltd. A/C GCF               16,666      16,666            0

Egger and Co.                                          20,000      20,000            0

MSS Nominees Ltd.                                       6,666       6,666            0

MGQ Nominees Limited a/c GGIGT                         16,666      16,666            0

C.O. Nominees                                          23,333      23,333            0

Gerlach & Co.                                          33,333      33,333            0

MSS Nominees Limited A/C 810015                        33,333      33,333            0

Wifleur Inc.                                            3,508       3,508            0

Triangle Bridge Group, L.P.                             3,508       3,508            0

Scot Holdings, Inc.                                     3,508       3,508            0

Marc H. Morgenstern                                     3,508       3,508            0

Bennett Yanowitz                                        5,508       3,508        2,000

Barbara Gisel                                           3,508       3,508            0

William C. Parrish                                      3,508       3,508            0
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
<S>                                                      <C>         <C>            <C>   
                                                      Shares of                   Shares
                                                    Common Stock                Owned After
                                                     Owned Prior                 Completion
                                                       to the       Shares        of the
                                                     Offering(1)     Being        Offering
Selling Shareholder                                                 Offered
- -------------------                                  -----------     ------    ------------        
Vassilios and Lynne Sirpolaiois                         3,508       3,508            0

Robert E. Yancey, Jr.                                   3,508       3,508            0

Joseph E. Valenti Jr. Trust dated                       3,508       3,508            0
December 21, 1993

Jose Spiwak/ ttee and Sara Spiwak/ttee                  3,508       3,508            0

John Stafford                                           3,508       3,508            0

John A. Miller                                          3,508       3,508            0

Gordon A. Hughes and Elizabeth Hughes                   8,508       3,508        5,000
TEN ENT

Edwin R. Bindseil                                       3,508       3,508            0

Edward W. Rabin                                         3,508       3,508            0

Fay E. Schefer                                          3,508       3,508            0

Francis Cook                                            3,508       3,508            0

Douglas A. Pertz                                        3,508       3,508            0

Richard Bertero                                         3,508       3,508            0

Mary A. Froelich                                        3,508       3,508            0

Bruce D. Cowen                                          3,508       3,508            0

Talisman Capital Ltd.                                  13,333      13,333            0

Robert E. Kilkenny                                     13,333      13,333            0

The McCloskey Trust                                    14,035      14,035            0

Charles A. Smithgall, Jr.                              21,535      14,035        7,500

Jacobs Family Co. LLC                                  14,035      14,035            0

David Braverman Trust                                   7,017       7,017            0

Venture Capital Holdings, L.P.                         17,544      17,544            0

Charles K. Stewart                                     17,543      17,543            0
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
<S>                                                     <C>         <C>             <C>   
                                                      Shares of                   Shares
                                                    Common Stock                Owned After
                                                     Owned Prior                 Completion
                                                       to the       Shares        of the
                                                     Offering(1)     Being        Offering
Selling Shareholder                                                 Offered
- -------------------                                  -----------     ------    ------------        
James L. Brooks, Trustee, Brooks Family Trust          17,543      17,543            0

William   Broder,   Trustee,   James  L.   Brooks       3,508       3,508            0
Retained Income Trust

W.H. Kilkenny Co.                                      29,824      29,824            0

Link & Co.                                             33,333      33,333            0

Paul A. Sakmar Trust, Paul A. Sakmar Trustee           28,421      28,421            0

Employee's  Profit  Sharing  Plan  and  Trust  of      11,166       6,666        4,500
Steel Industries, Inc.

Akkad & Co.                                            49,122      49,122            0

ASTO OS, L.L.C.                                       159,336      94,736       64,600

Advance Capital Partners, L.P.                        256,727      85,444      171,283

Jackson National Life Insurance Company               157,894     157,894            0

Nap & Co.                                             140,350     140,350            0

Northman & Co.                                         42,104      42,104            0

Fuelship & Co.                                         28,070      28,070            0

Martin E. Messinger                                    24,561      24,561            0

LaSalle  National  Bank as  Custodian  for W.H.I.      70,000      70,000            0
Growth Fund, L.P.

Irving B. Harris Revocable Trust dtd 7/31/87           18,500      18,500            0

William W. Harris Trust                                 6,666       6,666            0

Roxanne H. Frank Trust                                 13,333      13,333            0

Harris Foundation                                      10,000      10,000            0

Irving Harris Foundation A                              4,000       4,000            0

Irving Harris Foundation B                              3,333       3,333            0
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
<S>                                                      <C>         <C>            <C>    
                                                      Shares of                   Shares
                                                    Common Stock                Owned After
                                                     Owned Prior                 Completion
                                                       to the       Shares        of the
                                                     Offering(1)     Being        Offering
Selling Shareholder                                                 Offered
- -------------------                                  -----------     ------    ------------        
Jerome Kahn, Jr. Revocable Trust                        2,000       2,000            0

David Rosenbaum & Margot Kahn JTWROS                      333         333            0

James J. Pelts                                          2,000       2,000            0

Fred Holubow                                            2,333       2,333            0

Michael S. Resnick                                        500         500            0

Peter E. Martin & Nancy K. Martin JTWROS                  666         666            0

Alae, LP                                                8,333       8,333            0

Crescent International Holdings Limited (4)            16,666      16,666            0

Pilot Trading Trust (5)                                 7,333       7,333            0

- -------------
</TABLE>

(1) Except as  otherwise  reflected in the  footnotes  to this table,  all share
ownership includes Shares owned by the Selling  Shareholders and shares that the
Selling  Shareholders  had the right to acquire within 60 days of April 4, 1998,
through the exercise of stock options.

(2) Gregory D. Lewis and Earl R. Lewis IV are sons of Earl R. Lewis,  a Director
of the Company and Thermo Instrument.

(3) Wynona L. Smith is the spouse of Arvin H.  Smith,  a Director of the Company
and Thermo Instrument, and the President of Thermo Electron.

(4) Crescent  International  Holdings Limited,  a member of the Olayan Group, is
indirectly controlled by Suliman S. Olayan, the father of Hutham S.
Olayan, a Director of Thermo Electron.

(5) Pilot Trading Trust is controlled by Robert A. McCabe,  a Director of Thermo
Electron, and members of his family.

      The Shares are being registered to permit public secondary  trading of the
Shares from time to time by the Selling  Shareholders.  All of the Shares  being
offered  by the  Selling  Shareholders  were  sold  by the  Company  in  private
placement  transactions  pursuant to Stock Purchase  Agreements with the Company
dated  September 24, 1997 and October 22, 1997 (the "Purchase  Agreements")  for
cash.

<PAGE>


      In the Purchase  Agreements,  the Company agreed,  among other things,  to
bear all expenses (other than underwriting discounts,  selling commissions,  and
fees and expenses of counsel and other advisors to the Selling  Shareholders) in
connection  with the  registration  and sale of the Shares being  offered by the
Selling  Shareholders.  See "Sale of Shares." The Company intends to prepare and
file such amendments and supplements to the Registration Statement of which this
Prospectus forms a part as may be necessary to keep the  Registration  Statement
effective  until all the Shares  registered  thereunder  have been sold pursuant
thereto or until,  by reason of Rule 144(k) of the SEC under the  Securities Act
or any other rule of similar  effect,  the Shares are no longer  required  to be
registered for the sale thereof by the Selling Shareholders.


                                SALE OF SHARES

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

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

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

<PAGE>


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


               INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

      The following documents previously filed with the SEC by the Company (File
No. 1-13975) are hereby incorporated in this Prospectus by reference:

      (1) Annual  Report on Form 10-K for the fiscal year ended January 2, 1999;
and

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

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

      The  Company  will  provide  without  charge  to any  person  to whom this
Prospectus is delivered, upon the written or oral request of such person, a copy
of any or all of the  foregoing  documents  incorporated  herein  by  reference.
Requests  for such copies  should be directed to Sandra L.  Lambert,  Secretary,
ONIX Systems Inc., c/o Thermo Electron  Corporation,  81 Wyman Street,  P.O. Box
9046, Waltham, Massachusetts 02454-9046 (telephone: (781) 622-1000).



<PAGE>



                                LEGAL MATTERS

      Certain  legal  matters  relating to the Shares  offered  hereby have been
passed upon for the Company by Seth H. Hoogasian,  Esq.,  General Counsel of the
Company. Mr. Hoogasian is a full-time employee of Thermo Electron, is an officer
of the Company, Thermo Instrument and Thermo Electron, and owns or has the right
to acquire 3,333 shares of Common Stock, 20,444 shares of the common stock, $.10
par value per  share,  of Thermo  Instrument  and  348,828  shares of the common
stock, $1.00 par value per share, of Thermo Electron.


                                   EXPERTS

      The financial  statements of the Company  incorporated  by reference  into
this Prospectus and the financial  statement schedule  incorporated by reference
into the Registration  Statement of which this Prospectus forms a part have been
audited by Arthur Andersen LLP,  independent public  accountants,  to the extent
and for the periods as indicated in their report with respect  thereto,  and are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said reports.


<PAGE>



                                   PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

      Item 14.  Other Expenses of Issuance and Distribution.

      The expenses  incurred by the Company in connection  with the issuance and
distribution of the securities being registered are as follows.  All amounts are
estimated except the Securities and Exchange Commission registration fee.
                                                                   Amount
                                                                  --------
     Registration fee - Securities and Exchange Commission  $     5,578.00
     Legal fees and expenses                                      5,000.00
     Accounting fees and expenses                                 5,000.00
     Printing and engraving expenses                             15,000.00
     Miscellaneous                                                2,422.00
                                                                  --------

         Total                                              $    33,000.00


      Item 15.  Indemnification of Directors and Officers.

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

      Thermo  Electron  Corporation  has an  insurance  policy that  insures the
directors  and officers of Thermo  Electron  Corporation  and its  subsidiaries,
including the Company,  against certain liabilities,  which might be incurred in
connection with the performance of their duties.

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

      Item 16.  Exhibits

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



<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 to this registration statement:

            (i)   To include any prospectus required by Section 10(a)(3) of
                  the Securities Act of 1933;

            (ii)  To reflect in the prospectus any facts or events arising
                  after the effective date of the registration statement (or
                  the most recent post-effective amendment thereof) which,
                  individually or in the aggregate, represent a fundamental
                  change in the information set forth in the registration
                  statement.  Notwithstanding the foregoing, any increase or
                  decrease in volume of securities offered (if the total
                  dollar value of securities offered would not exceed that
                  which was registered) and any deviation from the low or
                  high end of the estimated maximum offering range may be
                  reflected in the form of prospectus filed with the
                  Commission pursuant to Rule 424(b) if, in the aggregate,
                  the changes in volume and price represent no more than 20
                  percent change in the maximum aggregate offering price set
                  forth in the "Calculation of Registration Fee" table in the
                  effective registration statement;

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

      provided,  however,  that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
if the  information  required to be included in a  post-effective  amendment  by
those paragraphs is contained in periodic reports filed with or furnished to the
Commission by the  Registrant  pursuant to Section 13 or 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.

<PAGE>


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

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




<PAGE>


                                  SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, 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  Post-Effective
Amendment No. 1 on Form S-3 to  Registration  Statement on Form S-1 to be signed
on its behalf by the  undersigned,  thereunto  duly  authorized,  in the City of
Kingwood, State of Texas, on this 29th day of March, 1999.
                                                ONIX SYSTEMS INC.

                                          By:  /s/ William J. Zolner
                                               --------------------------
                                                William J. Zolner
                                                President and Chief
                                                Executive Officer

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

  Signature                         Title                        Date

/s/ William J. Zolner         President, Chief                   March 29, 1999
- --------------------------    Executive Officer and Director
William J. Zolner             (Principal Executive Officer)               

/s/ Theo Melas-Kyriazi        Chief Financial Officer            March 29, 1999
- --------------------------    (Principal Financial Officer)
Theo Melas-Kyriazi            

Paul F. Kelleher*             Chief Accounting Officer           March 29, 1999
- --------------------------    (Principal Accounting Officer)
Paul F. Kelleher          

Earl R. Lewis*                Chairman of the Board              March 29, 1999
- --------------------------    and Director
Earl R. Lewis                 

David J. Beaubien*            Director                           March 29, 1999
- --------------------------
David J. Beaubien

Frank Jungers*                Director                           March 29, 1999
- --------------------------
Frank Jungers

Arvin H. Smith*               Director                           March 29, 1999
- --------------------------
Arvin H. Smith

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

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


<PAGE>



                                EXHIBIT INDEX


  Exhibit No.                        Description of Exhibit

         4      Specimen Common Stock Certificate (filed as Exhibit 4 to the
                Registrant's Registration Statement on Form S-1 [Registration
                No. 333-45333] and incorporated herein by reference).
         5      Opinion of Seth H. Hoogasian, Esq. (previously filed).
        23.1    Consent of Arthur Andersen LLP.
        23.2    Consent of Seth H. Hoogasian, Esq. (contained in Exhibit 5).
         24     Power of Attorney (previously filed).


<PAGE>



                                                                    EXHIBIT 23.1



                  Consent of Independent Public Accountants


To ONIX Systems Inc.:

      As independent public accountants,  we hereby consent to the incorporation
by reference in this Registration  Statement on Form S-3 and related  Prospectus
of ONIX Systems  Inc. of our reports  dated  February  16, 1999,  included in or
incorporated  by reference  into ONIX Systems  Inc.'s Annual Report on Form 10-K
for the year ended January 2, 1999,  and to all  references to our Firm included
in or made a part of this Registration Statement and related Prospectus.



                                                      ARTHUR ANDERSEN LLP



Boston, Massachusetts
March 29, 1999




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