ESSEX CORPORATION
10QSB, 1997-08-12
ENGINEERING SERVICES
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                                   FORM 10-QSB
                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


[X]   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
      SECURITIES AND EXCHANGE ACT OF 1934

                  For the quarterly period ended June 29, 1997.


                         Commission File Number 0-10772


                                ESSEX CORPORATION
        (Exact name of small business issuer as specified in its charter)

         Virginia                                                  54-0846569
(State or other jurisdiction of                              (I.R.S. Employer
incorporation or organization)                            Identification No.)

9150 Guilford Road, Columbia, Maryland                             21046-1891
(Address of principal executive offices)                            (Zip Code)

Issuer's telephone number, including area code: (301) 939-7000


Check  whether  the issuer  (1) has filed all  reports  required  to be filed by
Section 13 or 15(d) of the  Securities  Exchange  Act of 1934 during the past 12
months (or for such shorter period that the registrant was required to file such
reports),  and (2) has been subject to such filing  requirements for the past 90
days.

YES       X       NO

State the number of shares  outstanding  of each of the issuer's class of Common
Stock as of the latest practicable date.

                                                                   Outstanding
                Class                                           at June 29, 1997
Common Stock, par value $0.10 per share                              3,626,098

Transitional Small Business Disclosure Format (Check One);

YES               NO     X



<PAGE>


                                ESSEX CORPORATION

                         PART I - FINANCIAL INFORMATION


ITEM 1.         FINANCIAL STATEMENTS

The  interim  financial   statements  are  unaudited  but,  in  the  opinion  of
management,  reflect all adjustments for a fair presentation of results for such
period.  The results of operations  for any interim  period are not  necessarily
indicative of results for the full year.  These financial  statements  should be
read in conjunction with the financial statements and notes thereto contained in
the Company's  Annual  Report on Form 10-KSB for the fiscal year ended  December
29, 1996.




                                        2

<PAGE>


                                ESSEX CORPORATION
<TABLE>

                                 BALANCE SHEETS

<CAPTION>

                                                                              June 29,                December 29,
                                                                                1997                      1996
                                                                             (unaudited)               (unaudited)
     ASSETS


Current Assets
<S>                                                                     <C>                       <C>                 
  Cash                                                                  $            781,865      $          1,507,603
  Accounts receivable, net                                                           417,763                   431,870
  Inventory                                                                          781,006                   482,317
  Prepayments and other                                                               26,910                   115,735
  Net current assets of discontinued operations                                       42,797                    60,777
                                                                                   2,050,341                 2,598,302


Property and Equipment
  Production and special equipment                                                 1,016,458                 1,014,201
  Furniture, equipment and other                                                     849,660                   831,740
                                                                                   1,866,118                 1,845,941
  Accumulated depreciation and amortization                                       (1,530,442)               (1,396,475)
                                                                                     335,676                   449,466

Other Assets
  Net noncurrent assets of discontinued operations                                 1,176,833                 1,196,111
  Patents, net                                                                       176,625                   169,657
  Goodwill, net                                                                      114,579                   144,486
  Deferred debenture financing                                                        91,863                   104,880
  Other                                                                               31,092                    45,587
                                                                                   1,590,992                 1,660,721

TOTAL ASSETS                                                            $          3,977,009      $          4,708,489



<FN>
The accompanying notes are an integral part of these statements.
</FN>
</TABLE>


                                        3

<PAGE>


                                ESSEX CORPORATION

<TABLE>
                                 BALANCE SHEETS

<CAPTION>

                                                                              June 29,                December 29,
                                                                                1997                      1996
                                                                             (unaudited)               (unaudited)
     LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)


Current Liabilities
<S>                                                                     <C>                        <C>                 
  Current portion of capital leases                                     $             82,285       $             82,284
  Bank line of credit                                                                406,890                    900,000
  8% Convertible notes payable                                                       230,000                         --
  Accounts payable                                                                   611,593                    278,284
  Accrued wages and vacation                                                         172,615                    156,064
  Deferred revenues and loss reserves                                                 20,000                    265,000
  Accrued lease settlement                                                           299,551                    308,237
  Refundable deposit on sale of discontinued operations                              200,000                         --
  Other accrued expenses                                                             630,520                    495,521
                                                                                   2,653,454                  2,485,390


Long-term Debt
  10% Collateralized Convertible Debentures Due 2000                               1,400,000                  1,400,000
  Capital leases, net of current portion                                              57,534                     94,030

Redeemable Preferred Stock - Series A                                                120,000                         --

  Total Liabilities                                                                4,230,988                  3,979,420

Commitments and Contingencies (Note 4)

Stockholders' Equity (Deficit)
  Common stock, $0.10 par value; 25 million shares
    authorized; 3,626,098 and 3,625,098 shares issued
    and outstanding for 1997 and 1996, respectively                                  362,610                    362,510
  Contributions in excess of par value                                             5,316,308                  5,313,888
  Retained deficit                                                                (5,932,897)                (4,947,329)
                                                                                    (253,979)                   729,069

TOTAL LIABILITIES AND
STOCKHOLDERS' EQUITY (DEFICIT)                                          $          3,977,009       $          4,708,489

<FN>
The accompanying notes are an integral part of these statements.
</FN>
</TABLE>

                                        4

<PAGE>


                                ESSEX CORPORATION
<TABLE>

                            STATEMENTS OF OPERATIONS
                         FOR THE TWENTY-SIX WEEK PERIODS
                      ENDED JUNE 29, 1997 AND JUNE 30, 1996
<CAPTION>


                                                                                  1997                      1996
                                                                               (unaudited)               (unaudited)

<S>                                                                        <C>                       <C>               
Revenues                                                                   $        2,064,476        $        2,134,280
Cost of goods sold and services provided                                           (1,003,048)               (1,416,872)
Engineering and product development expenses                                         (389,056)                 (341,255)
Selling, general and administrative expenses                                       (1,440,417)               (1,836,481)

    Operating Loss                                                                   (768,045)               (1,460,328)

Gain on settlement of lawsuit,
  net of related expenses of $1,773,578 in 1996                                            --                 2,226,422
Lease settlement                                                                           --                  (250,000)
Interest expense                                                                     (116,550)                  (85,129)

Income (Loss) from Continuing Operations
  Before Income Taxes                                                                (884,595)                  430,965

  Provision for income taxes                                                               --                  (254,300)

Income (Loss) from Continuing Operations                                             (884,595)                  176,665

Income (Loss) from Discontinued Operations (Note 8)                                  (100,973)                  377,778

Net Income (Loss)                                                          $         (985,568)       $          554,443

Weighted Average Number of Shares
  Outstanding                                                                       3,626,005                 3,608,628

Primary Earnings (Loss) Per Share
  Continuing Operations                                                    $            (0.24)       $             0.05
  Discontinued Operations                                                               (0.03)                     0.10
                                                                           $            (0.27)       $             0.15

<FN>
The accompanying notes are an integral part of these statements.
</FN>
</TABLE>

                                        5

<PAGE>


                                ESSEX CORPORATION
<TABLE>

                            STATEMENTS OF OPERATIONS
                          FOR THE THIRTEEN WEEK PERIODS
                      ENDED JUNE 29, 1997 AND JUNE 30, 1996
<CAPTION>


                                                                                  1997                      1996
                                                                               (unaudited)               (unaudited)

<S>                                                                        <C>                       <C>               
Revenues                                                                   $          890,797        $        1,028,615
Cost of goods sold and services provided                                             (429,184)                 (510,116)
Engineering and product development expenses                                         (174,102)                 (183,755)
Selling, general and administrative expenses                                         (615,938)                 (907,710)

    Operating Loss                                                                   (328,427)                 (572,966)

Interest expense                                                                      (64,398)                  (39,577)

Loss from Continuing Operations
  Before Income Taxes                                                                (392,825)                 (612,543)

  Provision for income taxes                                                               --                        --

Loss from Continuing Operations                                                      (392,825)                 (612,543)

Income (Loss) from Discontinued Operations (Note 8)                                  (134,194)                   96,343

Net Loss                                                                   $         (527,019)       $         (516,200)

Weighted Average Number of Shares
  Outstanding                                                                       3,626,098                 3,624,081

Primary Earnings (Loss) Per Share
  Continuing Operations                                                    $            (0.11)       $            (0.17)
  Discontinued Operations                                                               (0.04)                     0.03
                                                                           $            (0.15)       $            (0.14)

<FN>
The accompanying notes are an integral part of these statements.
</FN>
</TABLE>

                                        6

<PAGE>


                                ESSEX CORPORATION
<TABLE>

                            STATEMENTS OF CASH FLOWS
                         FOR THE TWENTY-SIX WEEK PERIODS
                      ENDED JUNE 29, 1997 AND JUNE 30, 1996
<CAPTION>

                                                                                1997                1996
                                                                             (unaudited)         (unaudited)
Cash Flows From Operating Activities:
<S>                                                                        <C>                 <C>           
  Net Income (Loss)                                                        $     (985,568)     $      554,443
  Adjustments to reconcile Net Income (Loss) to Net Cash
   (Used In) Provided By Operating Activities:


      Depreciation and amortization                                               139,558             255,751
      Provision for contract reserves                                                  --             250,000
      Gain on sale/retirement of fixed assets                                      (4,554)               (850)


  Change in Assets and Liabilities:
      Accounts receivable                                                          14,107             179,632
      Inventory                                                                  (298,689)           (137,564)
      Prepayments and other assets                                                 91,258              (5,224)
      Goodwill                                                                         --             204,299
      Accounts payable                                                            333,309            (207,640)
      Accrued lease settlement                                                     (8,686)            (70,109)
      Other liabilities                                                           (93,450)             71,680
      Non-cash charges and working capital
        changes of discontinued operations                                         44,661             229,023

  Net Cash (Used In) Provided By Operating Activities                            (768,054)          1,323,441

Cash Flows From Investing Activities:
  Purchases of property and equipment                                              (4,595)            (81,770)
  Proceeds from sale of fixed assets                                                5,909                 798
  Net Cash Provided By (Used In) Investing Activities                               1,314             (80,972)


Cash Flows From Financing Activities:
  Short-term borrowings (repayments), net                                        (493,110)           (240,010)
  Issuance of convertible notes payable                                           230,000                  --
  Issuance of preferred stock                                                     120,000                  --
  Deposit on sale of operations                                                   200,000                  --
  Issuance of convertible debentures, net of financing costs                       26,134             756,614
  Proceeds from exercises of stock options                                          2,520             100,315
  Payment of capital lease obligations                                            (44,542)           (131,352)

  Net Cash Provided By Financing Activities                                        41,002             485,567


Cash and Cash Equivalents
   Net increase (decrease)                                                       (725,738)          1,728,036
   Balance - beginning of period                                                1,507,603             822,065
   Balance - end of period                                                 $      781,865      $    2,550,101

<FN>
The accompanying notes are an integral part of these statements.
</FN>
</TABLE>

                                        7

<PAGE>


                                ESSEX CORPORATION

                     NOTES TO INTERIM FINANCIAL INFORMATION

NOTE 1:       General

Fiscal Year and Presentation

Essex  Corporation  (the  "Company") is on a 52-week fiscal year ending the last
Sunday in December.  Certain amounts for 1996 have been  reclassified to conform
to the 1997 presentation.

New Accounting Pronouncements

Statements of Financial  Accounting  Standards No. 128, "Earnings Per Share" and
No. 129  "Disclosure of Information  about Capital  Structure" are effective for
periods  ending after  December  15,  1997.  The  information  required  will be
provided in the Company's 1997 year end financial statements.

 Use of Estimates

The preparation of financial  statements in conformity  with generally  accepted
accounting principles requires management to make estimates and assumptions that
affect  the  reported  amounts  of assets  and  liabilities  and  disclosure  of
contingent  assets and  liabilities at the date of the financial  statements and
the  reported  amounts of revenues  and expenses  during the  reporting  period.
Actual results could differ from those estimates.

Important Business Risk Factors

Historically the Company has been  principally a supplier of technical  services
under  contracts  or  subcontracts  with  departments  or  agencies  of the U.S.
Government,  primarily the military  services and other departments and agencies
of the Department of Defense.

Beginning in 1989, the Company has expended significant funds to transition into
the commercial  marketplace,  particularly the productization of its proprietary
technologies in optoelectronic  processors. The long-term success of the Company
in this area is  dependent  on its  ability to  successfully  develop and market
products related to its optoelectronic  processors. The success of these efforts
is subject to changing technologies, availability of financing, competition, and
ultimately market acceptance.

The Company has incurred  significant  losses since 1989,  primarily  due to the
development  and marketing of its  optoelectronics  products and  services.  The
Company has also  experienced  difficulty  in sustaining  and expanding  revenue
volume in certain areas of the technical services business.  The optoelectronics
products and services  business is currently  experiencing net cash expenditures
(including   all  general  and   administrative   expenses)   over  receipts  of
approximately  $100,000  per month.  The  Company  has taken  steps to  increase
revenue volume and reduce expenditures.  If current conditions remain unchanged,
the Company would not be able to sustain its business without additional working
capital or further cost reductions.


                                        8

<PAGE>


                                ESSEX CORPORATION

The Company has addressed the current working  capital  shortfall by selling the
majority of its  technical  services  operations.  In addition,  the Company has
placed its Huntsville, Alabama facility for sale. However, the proceeds from the
sale of the  Huntsville  facility would be restricted as to the use of the funds
as  the  facility  currently  serves  as a  portion  of  the  collateral  on the
convertible  debentures.  One arrangement for the sale of certain operations was
closed in early  August  and  another  arrangement  is in the  process  of being
definitized.

The Company continues to seek additional funds from private financing sources to
finance  operations and to achieve desired product  inventory levels and initial
market  penetration.  The Company is also seeking to establish joint ventures or
strategic partnerships with major industrial concerns to facilitate these goals.
Significant   further   delays  in  the   commercialization   of  the  Company's
optoelectronic  products  or failure  to raise  substantial  additional  working
capital  and  to  commercialize  such  optoelectronic   products  would  have  a
significant  adverse effect on the Company's future operating results and future
financial position.

The current receivable  financing  arrangement expires August 31, 1997 (see Note
3). While the Company  believes  the  financing  arrangement  should be renewed,
terms and  conditions  of  succeeding  agreements  may  change.  If the  current
arrangement is not renewed, the Company will need to obtain financing from other
sources to finance its operations.

NOTE 2:       Net Income (Loss) Per Share

Net income (loss) per share has been calculated by dividing net income (loss) by
the weighted  average number of shares  outstanding  during each period.  Common
stock  equivalents  were excluded from the  computation of primary  earnings per
share for 1997 because their effect was antidilutive or immaterial.

NOTE 3:       Accounts Receivable Financing

The Company has a  receivables  financing  arrangement  with Signet  Bank.  This
arrangement is evidenced by a Loan Agreement,  $1.0 million  Promissory Note and
Commercial  Security Agreement  ("Agreements").  Under the Agreements,  the Bank
will advance funds  against  certain  accounts  receivable.  The funds  advanced
($406,890  at June 29,  1997 and  $900,000  at  December  29,  1996)  constitute
proceeds  under the note which  currently  bears  interest  at an annual rate of
prime plus 4.0%  (previously  1.5% over prime  through May 30, 1997;  total rate
approximately  12.50% at June 29,  1997 and 9.75% at  December  29,  1996).  The
maximum  borrowings  available based upon the level of accounts  receivable were
approximately $412,000 at June 29, 1997 and $1,308,000 at December 29, 1996. The
Company  must also pay  certain  administrative  and  commitment  fees which are
expected to be less than $1,000/month. This agreement expires August 31, 1997.

This $1.0  million  line of credit is secured by all  accounts  receivables  and
certain  general  intangibles  (excluding  patents).  The  Company is subject to
certain restrictions, such as acquisitions or mergers; or creation or incurrence
of new debt.  Such  restrictions  were waived by the Bank in connection with the
issuance of the Company's  convertible  debentures,  preferred  stock,  8% notes
payable and divestiture of operations.


                                        9

<PAGE>


                                ESSEX CORPORATION


NOTE 4:       Commitments and Contingencies

Lease Settlement

Effective July 1994, the Company settled a legal dispute with a former landlord.
Under the remaining terms of the Settlement Agreement ("Agreement"), the Company
agreed to make  contingent  cash payments of 25% of future earnings (as defined)
and  10-15%  of the net  proceeds  from the sale of  common  stock or  operating
assets,  the total of such  payments  not to exceed  $550,000.  The Company also
issued an option to purchase up to 125,000  shares of the Company's  stock at an
exercise  price  (subject  to  adjustment)  of  $2  per  share.  The  option  is
exercisable  through December 31, 2004 and has certain  registration rights upon
exercise of the option.

The contingent amounts due are to be paid quarterly.  The period for computation
of such contingent  payments ends December 2004. The $300,000 accrual as of June
29, 1997  represents  the remaining  contingent  portion which is probable to be
paid over the applicable consideration period.

In accordance  with the Agreement,  the Company agreed to pay 20% (not to exceed
$250,000) from the settlement  from the lawsuit  described  below. As this legal
proceeding  was favorably  concluded in 1996,  the amount payable of $250,000 to
the former  landlord was expensed in the first quarter of 1996 and paid in April
1996.

Legal Proceeding

In  1996,  the  Company  and  a  corporate  defendant  reached  an  out-of-court
settlement of the  Company's  previously  reported  1994 lawsuit  pending in the
United States  District Court in Albuquerque,  New Mexico.  The express terms of
the settlement, including terms regarding the confidentiality of the settlement,
were definitized and full payment was received by the Company in 1996. Under the
terms of the settlement,  the Company netted in 1996  approximately $2.2 million
from this legal  settlement  after  payment  of  contingent  attorney's  fees of
$1,525,000 and related  expenses  incurred in 1996 of $249,000.  The Company had
expensed  approximately  $384,000  in legal fees and  related  expenses in prior
years.

NOTE 5:       Common Stock Offering; Warrants Outstanding; Preferred Stock;
              Convertible Notes Payable and Debentures

In July 1995, the Company  successfully  completed a $2.5 million Stock Offering
("Offering").  Through the Offering, the Company sold 25,000 Units consisting of
1,750,000  newly issued shares of common stock and warrants  (expiring  June 30,
1998 and  exercisable  at $75.00 for 25 shares) to obtain an additional  625,000
new shares.

In connection  with the Offering,  the Company  entered into a Placement  Agency
Agreement with a registered broker/dealer. In addition to cash compensation, the
broker/dealer received warrants for 175,000 shares of common stock. The warrants
are exercisable through December 1, 1999 at a price of $2.30 per share,  subject
to adjustment under anti-dilution

                                       10

<PAGE>


                                ESSEX CORPORATION

provisions  of  the  Warrant   Agreement.   The  warrant  holders  have  certain
registration rights for these shares of common stock.

In connection with the issuance of the 10% Convertible Collateralized Debentures
Due 2000, the Company has reserved  approximately 400,000 shares of common stock
for   conversion.   In  addition,   the  Company  has  issued  warrants  to  the
broker/dealer  for 28,571 shares of common stock.  The warrants are  exercisable
through  December 1, 2000 at a price of $3.50 per share,  subject to  adjustment
under  anti-dilution  provisions of the Warrant  Agreement.  The warrant holders
have certain  registration  rights for these shares of common stock. The Company
has also issued  warrants for 78,400 shares to the  purchasers of the Debentures
under  essentially  the same terms and conditions as the warrants  issued to the
broker/dealer.

In connection with the issuance of 8% Convertible notes payable, the Company has
reserved 460,000 shares of common stock for conversion.

In January  1997, a class of preferred  stock was approved by the  shareholders.
The  Company's  Articles of  Incorporation  were amended to authorize a class of
preferred  stock, 1 million  shares,  par value $0.01 per share,  the series and
rights of which may be designated from time-to-time by the Board of Directors in
accordance  with  applicable  state and  federal  law.  In June 1997,  the Board
designated  2,500  shares  of such  preferred  stock as Series A with a $100 par
value and an 8% annual  dividend.  Such shares are redeemable  after 90 days and
before 1 year from date of issuance at the option of the holder. These preferred
shares are convertible  into shares of Essex common stock at $0.50 per share and
have certain other conversion  protection  features.  There were 1,200 shares of
preferred  stock  issued and  outstanding  at June 29,  1997.  The  Company  has
reserved 240,000 shares of common stock for conversion.

The Company  has  reserved  approximately  2,007,000  shares of common  stock in
connection  with the convertible  debentures,  notes and preferred stock and the
possible exercise of all such warrants.

NOTE 6:       Income Taxes

The Company is in a net operating loss (NOL) carryforward  position for book and
tax purposes.  Such NOL was utilized to reduce the provision for income taxes in
the first half of 1996 to $254,300.  However,  as no book or taxable  income was
ultimately  realized in fiscal 1996,  this  provision was reversed in subsequent
quarters of 1996.

NOTE 7:       Statements of Cash Flows

Supplemental disclosures of cash flow information are as follows:

       Capital lease obligations of $115,722 were incurred during the first half
       of 1996,  when the Company entered into various leases for new equipment.
       There were no new capital leases entered into in the first half of 1997.




                                       11

<PAGE>


                                ESSEX CORPORATION

NOTE 8:       Discontinued Operations

In June 1997, the Board of Directors  unanimously  approved,  effective June 29,
1997,  the  disposition  of  the  Systems  Effectiveness  Division  ("SED")  and
operations   of  the   Federal   Systems   Division   ("FSD")   except  for  the
telecommunications and government-related  optoelectronics  businesses which are
comprised of different customers, a separate location in Columbia,  Maryland and
distinguishable  operations.  The  operations to be  discontinued  comprised the
majority of the Company's Technical Services and Products business operations.

On August 4, 1997,  the Company  completed the sale of certain of the assets and
operations of FSD for  approximately  $225,000 in cash and assumption of certain
liabilities of  approximately  $60,000.  The estimated net gain of approximately
$175,000 will be recognized in the third quarter of 1997.  There is a contingent
payment of $75,000 due upon award of certain new  business  expected  during the
1997 third quarter which could increase the net gain.

Another  portion of the operations of FSD which were performed  primarily in the
Company's facility in Huntsville,  Alabama are being discontinued.  There is one
remaining  contract  which is  expected  to be  completed  in August  1997.  The
Huntsville  facility  has  been  placed  for  sale  and is  included  in the net
noncurrent assets shown in the balance sheets.

On July 8,  1997,  the  Company  entered  into a Letter  of  Intent to sell SED.
Negotiations  are in process to finalize  the sale and are  expected to conclude
during the third quarter of 1997.


Summarized results of operations for the discontinued operations are as follows:

<TABLE>

                                   Six months ended June 29, 1997
                                   ------------------------------
<CAPTION>

                            Revenues                     Net Income (Loss)
                            --------                     -----------------

<S>                  <C>                             <C>                     
    SED              $            2,782,000          $                245,000

    FSD              $            1,625,000          $               (346,000)

</TABLE>
<TABLE>

                                   Six months ended June 30, 1996
                                   ------------------------------
<CAPTION>

                            Revenues                        Net Income
                            --------                        ----------

<S>                  <C>                             <C>                     
    SED              $            2,550,000          $                293,000

    FSD              $            2,960,000          $                 85,000
</TABLE>






                                       12

<PAGE>


                                ESSEX CORPORATION

Net current and noncurrent assets are comprised of the following:

<TABLE>
<CAPTION>
Net Current                                               As of                          As of
                                                      June 29, 1997                December 29, 1996

<S>                                             <C>                            <C>                     
  Receivables, net                              $               896,588        $              1,002,676
  Other assets                                                   53,451                          53,415
  Accounts payable                                             (456,155)                       (181,145)
  Accrued wages and vacation                                   (212,507)                       (194,035)
  Other accrued liabilities                                    (238,580)                       (245,134)
  Deferred revenues and loss reserves                                --                        (375,000)
                                                $                42,797        $                 60,777

Net Noncurrent

  Property, plant and equipment,
     net of accumulated
     depreciation                               $             1,316,822        $              1,384,250

  Industrial Revenue Bond                                      (113,318)                       (153,319)
  Other long-term liabilities                                   (26,671)                        (34,820)
                                                $             1,176,833        $              1,196,111
</TABLE>


                                       13

<PAGE>


                                ESSEX CORPORATION

ITEM 2.       MANAGEMENT'S DISCUSSION AND ANALYSIS OR PLAN OF OPERATION

Management's  Discussion  and Analysis or Plan of Operation  and other  sections
contain forward-looking  statements that are based on management's expectations,
estimates, projections and assumptions. Words such as "expects",  "anticipates",
"plans",  "believes",   "estimates",   variations  of  such  words  and  similar
expressions  are  intended  to identify  such  forward-looking  statements  that
include,  but are not limited to,  projections  of revenues,  earnings,  segment
performance, cash flows and contract awards. Such forward-looking statements are
made pursuant to the safe harbor provisions of the Private Securities Litigation
Reform Act of 1995.  These  statements are not guarantees of future  performance
and involve  certain  risks and  uncertainties  that are  difficult  to predict.
Therefore,  actual future results and trends may differ  materially from what is
forecast in forward-looking statements due to a variety of factors.

Historically, Essex Corporation has been a diversified, technology-based company
providing quality products and professional services to government and industry.
Essex previously determined that it operated in two business segments: Technical
Services and Products;  and  Optoelectronic  Products and Services.  The Company
allocated its operations to the following business units:


     o   Systems Effectiveness Division (SED)
     o   Federal Systems Division (FSD)
     o   Commercial Products Division (CPD)


SED operated in the Technical Services and Products segment; CPD operated in the
Optoelectronics  Products  and  Services  segment;  and  FSD  operated  in  both
segments.

In June 1997, the Board of Directors unanimously  authorized the sale of the SED
and the FSD operations (except for the telecommunications and government-related
optoelectronics  businesses).  The historical  technical services business areas
were too diverse  relative to the size of the  Company.  The Company  intends to
concentrate all its efforts and resources in commercializing its optoelectronics
and  telecommunications  products and services.  On August 4, 1997,  the Company
sold   the   FSD   operations   (except   for   the    telecommunications    and
government-related  optoelectronics  businesses) for  approximately  $225,000 in
cash and assumption of certain liabilities of approximately $60,000. The Company
has  signed a Letter  of  Intent  to sell the SED  operations  and is  currently
negotiating  the final terms of the  proposed  transaction.  Effective  June 29,
1997,  the Company has presented the results of these SED and FSD  operations as
"discontinued  operations".  Prior years'  figures have been restated to reflect
the amounts of such discontinued operations.

Continuing  operations  reflect the results of the Commercial  Products Division
which   provides    optoelectronic   products   and   services,   as   well   as
telecommunications  engineering  services.  Continuing  operations  also include
related  optoelectronic  products and services revenues provided to ongoing U.S.
Government  customers which were previously provided through the Federal Systems
Division.

                                       14

<PAGE>


                                ESSEX CORPORATION


CONTINUING OPERATIONS

Revenues were $891,000 and $1,029,000 for the second  quarters of 1997 and 1996,
respectively,  a decline of 13%. Revenues were $2,065,000 and $2,134,000 for the
first  half  periods  of 1997 and  1996,  respectively,  a  decline  of 3%.  The
Company's  work for  Motorola on its Iridium  cellular  satellite  communication
system  accounted  for  revenues of $914,000  and  $1,196,000  of the first half
revenues for 1997 and 1996, respectively.  This represented 44% and 56% of total
revenues for the first half periods of 1997 and 1996, respectively.  There was a
decline in revenues  from this  program  between the first half periods as tasks
were  completed  for the initial  satellite  system.  The Company  continues  to
perform work on the current and successor satellite systems and has a backlog on
the  Motorola   program  of  over  $950,000.   The  Company  has  a  backlog  of
approximately  $700,000  on  programs  related  to  optoelectronic  devices  and
services.

The decline in revenues on the Motorola  contract were  partially  offset by the
sale of one  Imsyn(TM)  unit for $250,000  during the first  quarter of 1997 for
U.S.  Government  end use under a development  and  applications  contract.  The
Company does not have any firm orders for ImSyn(TM) units as of August 11, 1997.

There were losses from  continuing  operations  of $328,000  and $573,000 in the
second  quarters of 1997 and 1996,  respectively.  There were losses of $768,000
and $1,460,000 in the first half periods of 1997 and 1996, respectively. Cost of
goods  sold and  services  provided  for the  first  half of 1996  was  66.4% as
compared to 48.6% in 1997. In 1996,  significant  additional  costs in excess of
amounts which could be recovered  were incurred on two contracts for delivery of
initial optoelectronic processor devices.

Selling,  general and administrative  expenses ("SG&A") were $1.8 million in the
first  half of  1996  compared  to $1.4  million  in the  first  half of 1997 on
approximately the same overall revenue volume.  The $400,000 of such higher SG&A
expenses contributed to the larger loss in 1996.

Overall, SG&A expenses remain high relative to the revenue volume as the Company
seeks to commercialize its optoelectronic products and services. The Company has
reduced  expenses  between  the 1996 and 1997  periods  and  expects  to curtail
expenditures where possible while retaining essential technical capabilities and
personnel in the optoelectronics and telecommunications businesses.

DISCONTINUED OPERATIONS

There was a loss from  discontinued  operations  of $134,000 and $101,000 in the
second  quarter and first half periods of 1997,  respectively.  There was income
from such discontinued  operations of $96,000 and $378,000 in the second quarter
and first half periods in 1996, respectively.

Discontinued   operations   are   comprised   of  the  results  of  the  Systems
Effectiveness Division and the operations of the Federal Systems Division except
for the telecommunications and  government-related  optoelectronics  businesses.
During 1997 and 1996, the SED  operations had first half sales of  approximately
$2.8 million and $2.6 million, respectively, and produced

                                       15

<PAGE>


                                ESSEX CORPORATION

income of  approximately  $250,000  during each first half  period.  A Letter of
Intent has been signed to sell the SED operations.  Negotiations  are in process
to definitize the terms of the sale and are expected to be concluded  during the
third quarter of 1997.

The FSD  discontinued  operations  saw  revenues  decline from $3 million in the
first half of 1996 to $1.6  million in the first half of 1997.  There was a loss
from operations of approximately  $350,000 in the first half of 1997 compared to
income of approximately  $90,000 during the first half of 1996. During the first
half of 1996,  FSD was  working  on  several  programs,  including  a program to
produce  aviation  maintenance  trainers (the  "Trainers  Program"),  which were
estimated to be on budget and provided volume to recover indirect  expenses.  In
late 1996, the Trainers Program incurred performance difficulties which produced
losses on this  program  in the last  quarter  of 1996.  Additional  significant
completion  problems were  encountered  in the first half of 1997 which produced
additional  losses. FSD was unable to secure additional new business on a timely
basis  resulting in the  decision to close the  Huntsville,  Alabama  production
facility  concurrent with the end of the Trainers Program  (rescheduled for late
August 1997). The sale of certain other FSD technical service operations located
elsewhere  was  completed in early August 1997 and the net gain will be reported
in the third quarter of 1997.

CORPORATE MATTERS

There was a gain in 1996 on settlement of lawsuit (approximately  $1,972,000 net
of $254,000 of income taxes, or $0.55 per share).  This gain triggered a payment
to the former  landlord  and expense of $250,000  ($0.07 per share).  The income
(loss) per share results are computed on weighted average shares  outstanding of
3,609,000 in 1996.

The Company and a corporate defendant reached an out-of-court settlement.  Under
the  terms  of the  Settlement  Agreement,  the  Company  recognized  a gain  of
approximately  $2.2  million  after  payment of  contingent  attorney's  fees of
$1,525,000 and related  expenses of $249,000.  The Company had expensed in prior
years approximately  $385,000 in connection with this lawsuit. In addition,  the
Company  recognized an expense of $250,000 as part of the  previously  concluded
rent dispute with its former landlord. The Company was liable for such a payment
upon successful conclusion of the previously described lawsuit.

In 1997, the Company's interest costs increased due to the increased  borrowings
under its line of credit.  Total  interest costs were $117,000 in the first half
of 1997 compared to $85,000 in the same period of 1996.

The  Company  recognized  the  majority  of its  remaining  tax  benefit  amount
recoverable  from the  carryback  of net  operating  losses  prior to 1994.  The
Company is in a net operating loss (NOL) carryforward  position. No provision or
benefit from income taxes was recognized in the first half of 1997. In the first
half of 1996,  the Company  recorded a book income tax expense,  although  lower
than at statutory  rates.  However,  as no book or taxable income was ultimately
realized in fiscal year 1996, this provision was reversed in subsequent quarters
of 1996.





                                       16

<PAGE>


                                ESSEX CORPORATION

FINANCIAL CONDITION - LIQUIDITY AND CAPITAL RESOURCES
The  Company  evaluates  its  liquidity  position  using  various  factors.  The
following represents some of the more important factors:
<TABLE>

                                                            SELECTED FINANCIAL DATA ($ Thousands)
                                                            -------------------------------------
<CAPTION>
                                                                               AS OF
                                                       June 29,         December 29,            June 30,
                                                         1997                1996                 1996
                                                         ----                ----                 ----
<S>                                                <C>                  <C>                  <C>           
Total Assets                                       $          3,977     $         4,708      $        6,237

Working Capital (Deficit)                          $           (603)    $           113      $        2,037

Current Ratio                                                0.77:1              1.05:1              1.97:1

Current and Long-Term
     Capital Leases                                $            140     $           176      $          189
Bank Line of Credit                                             407                 900                 677
Convertible Notes Payable                                       230                  --                  --
Convertible Debentures                                        1,400               1,400               1,400
     Total Debt/Financing                          $          2,177     $         2,476      $        2,266

Stockholders' Equity (Deficit)                     $           (254)    $           729      $        2,615
</TABLE>

The Company experienced a substantial  decrease in its working capital and ratio
due  primarily  to the net loss of $986,000  in the first half of 1997.  The net
loss was the primary  factor in the $768,000 of net cash used in  operations  in
the first half of 1997.

At June 29, 1997, Company has negative working capital of approximately $600,000
and a stockholders' deficit of approximately $250,000. During June 1997, certain
insiders and directors invested $350,000 in convertible  unsecured notes payable
and redeemable  preferred  stock.  Such amounts are not considered  equity since
they are  primarily  considered  debt  instruments.  The  Company  should have a
positive equity after the conclusion of the sales of all discontinued operations
as discussed below.

The Company has incurred significant losses over recent years,  primarily due to
the development and marketing of its optoelectronics  products and services. The
Company has also  experienced  difficulty  in sustaining  and expanding  revenue
volume in certain areas of the  technical  services and products  business.  The
optoelectronics  products and services  business is currently  experiencing  net
cash  expenditures  (including  all general and  administrative  expenses)  over
receipts of  approximately  $100,000  per month.  The Company has taken steps to
increase revenue volume and reduce  expenditures.  If current  conditions remain
unchanged,  the  Company  would  not be able to  sustain  its  business  without
additional working capital or further cost reductions.

As  previously  discussed in the  Company's  1996 Form  10-KSB,  the Company has
addressed the current working  capital  shortfall by selling the majority of its
technical  services  operations.  One  arrangement  for the sale of certain  FSD
operations was closed in early August and another

                                       17

<PAGE>


                                ESSEX CORPORATION

arrangement  for  the  sale  of  SED  operations  is in  the  process  of  being
definitized.  The Company has also placed its Huntsville,  Alabama  facility for
sale.  However,  the proceeds from the sale of the Huntsville  facility would be
restricted  as to the use of the  funds as the  facility  currently  serves as a
portion of the collateral on the convertible debentures.

The Company continues to seek additional funds from private financing sources to
finance  operations and to achieve desired product  inventory levels and initial
market  penetration.  The Company is also seeking to establish joint ventures or
strategic partnerships with major industrial concerns to facilitate these goals.
Significant  delays in the  commercialization  of the  Company's  optoelectronic
products, failure to commercialize such products or failure to raise substantial
additional  working  capital  would  have a  significant  adverse  effect on the
Company's future operating results and future financial position.

The Company has  approximately  $780,000 of  inventory in current  assets.  This
inventory is comprised of ImSyn(TM)  optoelectronic  processors  and consists of
finished  goods and  work-in-process.  Sales of such units will be  necessary in
order to maintain working capital liquidity.  There are no firm orders for sales
of such units as of August 11, 1997.

The current receivable financing  arrangement expires August 31, 1997. While the
Company  believes  the  financing  arrangement  should  be  renewed,  terms  and
conditions of succeeding agreements may change. In order to fund its operations,
the Company will be required to replace or extend such  arrangement and to raise
additional  working capital.  There can be no assurance that the Company will be
successful in doing so.

Under the settlement  agreement reached with the landlord,  certain payments are
triggered only by other future cash inflows.  The remaining $300,000  contingent
portion  of the  landlord  settlement  obligation  (which has been  accrued  and
expensed in prior  years),  is not payable  until future  earnings (as defined),
operating asset sales or equity capital  funding occur.  When such future events
transpire,  only a portion of the cash flows or proceeds  generated are payable.
The sales of the  discontinued  operations  of the Company  will  require that a
portion of the remaining $300,000 be paid from the proceeds from such sales.

The preceding  paragraphs  contain  forward-looking  statements  and the factors
affecting the ability of the Company to meet its funding requirements and manage
its cash  resources  include,  among other  things,  the magnitude and timing of
product sales and the magnitude of fixed costs.



                                       18

<PAGE>



                           PART II - OTHER INFORMATION

Item 6.      Exhibits and Report on Form 8-K.

        (a)  Exhibits

             (i)   Exhibit 4 - Instruments defining the Rights of Holders

                   4.8      Specimen of Preferred Stock - Series A

             (ii)  Exhibit 10 - Material Contracts

                   10.16    Subscription Agreement Between the Company and 
                            Harry Letaw, Jr. and Joyce Letaw
                   10.17    Subscription Agreement Between the Company and
                            Samuel Hopkins
                   10.18    Subscription Agreement Between the Company and
                            Harold P. Hanson
                   10.19    8% Convertible Note Payable - Harry Letaw, Jr. 
                            and Joyce Letaw
                   10.20    8% Convertible Note Payable - Samuel Hopkins
                   10.21    8% Convertible Note Payable - Harold P. Hanson

             (iii) Exhibit 27 - Financial Data Schedule

                   27.1     Financial Data Schedule

        (b)  Reports on Form 8-K

             None

                                    SIGNATURE

In accordance with the requirements of the Securities  Exchange Act of 1934, the
Registrant  caused  this  report to be signed on its behalf by the  undersigned,
thereunto duly authorized.

                                ESSEX CORPORATION
                                  (Registrant)



Date:  11 August 1997      -----------------------
                              Joseph R. Kurry, Jr.
                                 Vice President,
                      Treasurer and Chief Financial Officer


(Mr. Kurry is the Principal  Financial and Accounting  Officer and has been
duly authorized to sign on behalf of the Registrant.)






                                                    EXHIBIT 4.8

                                      Specimen of Preferred Stock - Series A


<PAGE>



                                    SPECIMEN

                     INCORPORATED UNDER THE LAWS OF VIRGINIA
  NUMBER                                                           SHARES 

    -1
 ---------                                                       ------------
                                    




                                ESSEX CORPORATION

       AUTHORIZED CAPITAL STOCK: 2,500 Shares of Class A Preferred Stock,
                                par value $100.00



        THIS CERTIFIES THAT, -------------- is the registered holder of
                               (N A M E)
        -------------------  Shares of Class A Preferred Stock, par value
          (NUMBER IN WORDS) $100.00 per Share

        transferable  only on the books of the  Corporation by the holder hereof
        in person or by Attorney  upon  surrender of this  Certificate  properly
        endorsed.



        IN WITNESS WHEREOF,  the said Corporation has caused this Certificate to
        be signed by its duly  authorized  officers and its Corporate Seal to be
        hereunto affixed this ---- day of A.D 1997.

                                       (CORPORATE SEAL)

        --------------------                  ---------------------------------
        Assistant Secretary                   Chief Financial Officer/Treasurer

        SEE LEGEND ON REVERSE OF CERTIFICATE


<PAGE>




         THIS  SECURITIES  REPRESENTED  HEREBY  HAVE  NOT BEEN  THE  SUBJECT  OF
         REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  AND MAY NOT
         BE  SOLD,  TRANSFERRED  OR  OTHERWISE  DISPOSED  OF IN THE  ABSENCE  OF
         REGISTRATION  UNDER  THE  FOREGOING  ACT  OR  THE  AVAILABILITY  OF  AN
         EXEMPTION FROM THE REGISTRATION  REQUIREMENTS  THEREOF  (INCLUDING RULE
         144),  AS EVIDENCED BY AN OPINION OF COUNSEL  ACCEPTABLE TO THE COMPANY
         THAT SUCH REGISTRATION IS NOT REQUIRED.












         FOR VALUE RECEIVED ------------------ hereby sell, assign and transfer
         unto -----------------------------------------------------------------

         --------------------------------------------------------------- Shares
     represented by the within Certificate, and do hereby irrevocably constitute
     and appoint----------------------- Attorney to transfer the said Shares on
     the books of the within named Corporation with full power of substitution 
    in the premises.


                  Dated  ----------------------  19-----


                           In presence of----------------------------------





                                  EXHIBIT 10.16

Subscription Agreement Between the Company and Harry Letaw, Jr. and Joyce Letaw



<PAGE>



                                ESSEX CORPORATION

                     PROMISSORY NOTE SUBSCRIPTION AGREEMENT

THE SECURITIES  DESCRIBED  HEREIN HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES
ACT OF 1933, AS AMENDED,  NOR HAS THIS  SUBSCRIPTION  AGREEMENT  BEEN  REVIEWED,
APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE  COMMISSION,  NOR HAS THE
COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THE  INFORMATION  SET FORTH
HEREIN. NO STATE SECURITIES LAW ADMINISTRATOR OR OTHER JURISDICTIONAL  AUTHORITY
HAS PASSED UPON OR ENDORSED THE MERITS HEREOF OR THE ACCURACY OR THE ADEQUACY OF
THE  INFORMATION  SET  FORTH  HEREIN.  ANY  REPRESENTATION  TO THE  CONTRARY  IS
UNLAWFUL.

THE  SECURITIES  DESCRIBED  HEREIN HAVE BEEN OFFERED AND MADE  AVAILABLE ONLY TO
INVESTORS WHO QUALIFY AS "ACCREDITED  INVESTORS," AS DEFINED IN REGULATION D AND
RULE  501  PROMULGATED  UNDER  THE  SECURITIES  ACT OF  1933,  AS  AMENDED.  THE
SECURITIES  DESCRIBED  HEREIN WERE  OFFERED  PURSUANT TO AN  EXEMPTION  FROM THE
REGISTRATION  REQUIREMENTS  OF THE  SECURITIES  ACT OF  1933,  AS  AMENDED,  AND
APPLICABLE STATE SECURITIES LAWS FOR NON-PUBLIC OFFERINGS. SUCH EXEMPTIONS LIMIT
THE  NUMBER AND TYPES OF  SUBSCRIBERS  TO WHICH THE  OFFERING  HAS BEEN MADE AND
RESTRICT SUBSEQUENT TRANSFER OF THE SECURITIES DESCRIBED HEREIN.

THE  SECURITIES  DESCRIBED  HEREIN SHOULD BE CONSIDERED  ONLY BY A PERSON WHO OR
ENTITY  THAT  CAN  AFFORD  TO  SUSTAIN  THE  LOSS OF ITS  ENTIRE  INVESTMENT.  A
SUBSCRIBER WHO  SUBSCRIBES TO MAKE AN INVESTMENT IN SUCH  SECURITIES IS REQUIRED
TO  REPRESENT  THAT IT IS ABLE TO SUSTAIN  SUCH A LOSS AND IS FAMILIAR  WITH AND
UNDERSTANDS THE TERMS OF THE OFFERING OF THE SECURITIES DESCRIBED HEREIN.

THE SECURITIES  DESCRIBED HEREIN ARE RESTRICTED WITH RESPECT TO  TRANSFERABILITY
AND RESALE.  THE  SECURITIES  MAY NOT BE RESOLD OR OTHERWISE  DISPOSED OF BY THE
SUBSCRIBER  UNLESS,  IN THE  OPINION OF  COUNSEL  SATISFACTORY  TO THE  COMPANY,
REGISTRATION  UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE STATE
SECURITIES  LAWS IS NOT REQUIRED OR  COMPLIANCE  IS MADE WITH SUCH  REGISTRATION
REQUIREMENTS.

THE  SUBSCRIBER,  BY HAVING  ACCEPTED  DELIVERY OF THE  INFORMATIONAL  MATERIALS
PROVIDED BY THE COMPANY AND ALL  ACCOMPANYING  OR RELATED  DOCUMENTS,  AGREES TO
RETURN SUCH MATERIALS TO THE COMPANY UPON REQUEST IF THE  SUBSCRIBER  DETERMINES
NOT TO MAKE AN INVESTMENT IN ANY OF THE SECURITIES DESCRIBED HEREIN.



                                       i
<PAGE>



THIS SUBSCRIPTION AGREEMENT DOES NOT CONSTITUTE AN OFFER OR
SOLICITATION BY ANYONE IN ANY JURISDICTION IN WHICH SUCH AN OFFER
OR SOLICITATION IS NOT AUTHORIZED.

                             FOR FLORIDA RESIDENTS:

THE  SECURITIES  OFFERED  HEREBY WILL BE SOLD,  AND  ACQUIRED,  IN A TRANSACTION
EXEMPT  UNDER  SECTION  517.061(11)  OF  THE  FLORIDA  SECURITIES  AND  INVESTOR
PROTECTION ACT. THE SECURITIES  HAVE NOT BEEN  REGISTERED  UNDER SAID ACT IN THE
STATE OF FLORIDA.  PURSUANT TO SECTION 517.061(11) OF THE FLORIDA SECURITIES AND
INVESTOR  PROTECTION  ACT,  WHEN  SALES  ARE  MADE TO FIVE  (5) OR MORE  PERSONS
(EXCLUDING  ACCREDITED INVESTORS) IN THE STATE OF FLORIDA, ANY SALE IN THE STATE
OF FLORIDA MADE PURSUANT TO SECTION  517.061(11)  OF SUCH ACT IS VOIDABLE BY THE
PURCHASER IN SUCH SALE (WITHOUT INCURRING ANY LIABILITY TO THE COMPANY OR TO ANY
OTHER PERSON OR ENTITY)  EITHER  WITHIN THREE (3) DAYS AFTER THE FIRST TENDER OF
CONSIDERATION  IS MADE BY SUCH PURCHASER TO THE ISSUER,  AN AGENT OF THE ISSUER,
OR AN ESCROW  AGENT OR  WITHIN  THREE (3) DAYS  AFTER THE  AVAILABILITY  OF THAT
PRIVILEGE IS COMMUNICATED TO SUCH PURCHASER, WHICHEVER OCCURS LATER. TO VOID HIS
PURCHASE,  THE  PURCHASER  NEED ONLY SEND A LETTER OR TELEGRAM TO THE COMPANY AT
THE ADDRESS  INDICATED  HEREIN.  ANY SUCH LETTER OR TELEGRAM  SHOULD BE SENT AND
POSTMARKED PRIOR TO THE END OF THE  AFOREMENTIONED  THREE (3) DAY PERIOD.  IT IS
PRUDENT TO SEND ANY SUCH LETTER BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED,  TO
ASSURE  THAT IT IS  RECEIVED  AND ALSO TO HAVE  EVIDENCE OF THE TIME THAT IT WAS
MAILED. SHOULD A PURCHASER MAKE THIS REQUEST ORALLY, THAT PURCHASER MUST ASK FOR
WRITTEN  CONFIRMATION  THAT THE  REQUEST  HAS BEEN  RECEIVED.  IF  NOTICE IS NOT
RECEIVED WITHIN THE TIME LIMIT SPECIFIED HEREIN, THE FOREGOING RIGHT TO VOID THE
PURCHASE SHALL BE NULL AND VOID.


                                       ii


<PAGE>




                             FOR MARYLAND RESIDENTS:

IN MAKING AN INVESTMENT DECISION INVESTORS MUST RELY ON THEIR OWN EXAMINATION OF
THE  ISSUER  AND THE  TERMS OF THE  OFFERING,  INCLUDING  THE  MERITS  AND RISKS
INVOLVED.  THESE  SECURITIES  HAVE NOT BEEN  RECOMMENDED BY ANY FEDERAL OR STATE
SECURITIES  COMMISSION  OR  REGULATORY  AUTHORITY.  FURTHERMORE,  THE  FOREGOING
AUTHORITIES  HAVE NOT CONFIRMED THE ACCURACY OR DETERMINED  THE ADEQUACY OF THIS
DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                             FOR VIRGINIA RESIDENTS:

THESE  SECURITIES HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED,  OR THE  VIRGINIA  SECURITIES  ACT,  BY REASON OF  SPECIFIC  EXEMPTIONS
THEREUNDER  RELATING  TO  THE  LIMITED  AVAILABILITY  OF  THE  OFFERING.   THESE
SECURITIES CANNOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF TO ANY PERSON OR
ENTITY  UNLESS  SUBSEQUENTLY  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933, AS
AMENDED,  OR THE SECURITIES ACT OF THIS STATE, IF SUCH REGISTRATION IS REQUIRED,
OR UNLESS AN EXEMPTION FROM SUCH REGISTRATION IS AVAILABLE.


                                      iii





<PAGE>



                                ESSEX CORPORATION

                     PROMISSORY NOTE SUBSCRIPTION AGREEMENT

         The  undersigned,  (the  "Subscriber")  hereby  subscribes to acquire a
Non-Negotiable  8%  Convertible  Promissory  Note (the  "Note")  issued by Essex
Corporation,  a Virginia corporation (the "Company"), in the principal amount of
Two Hundred  Thousand Dollars  ($200,000.00)  substantially in the form attached
hereto as Exhibit A. The unpaid  principal  amount of this Note and the interest
thereon,  shall be convertible at the option of the Subscriber (the  "Conversion
Right") prior to the Maturity  Date, in the manner and on the terms  hereinafter
set forth,  into shares of common stock of the Company,  par value ($.10) at any
time prior to the Maturity  Date at a  conversion  price equal to the greater of
market  value on the date that the  election  to convert is made or fifty  cents
($.50) per  shares,  subject to  adjustment  pursuant  to Section 4 of the Note;
provided however,  that in the event the assets of the optoelectronics  division
of the Company have been transferred to another business enterprise in which the
Company  has a  controlling  shareholder  interest  ("Transferee"),  and  at the
election of the  Subscriber,  the unpaid  principal  amount of this Note and the
accrued interest thereon, shall be convertible into a percentage equity interest
of the Transferee determined pursuant to the following formula:

          x/y where x is the dollar  amount  converted  and y is the fair market
         value  (or  mean  fair  market  value,   if  more  than  one  valuation
         methodology  is  utilized)  as  determined  by a third party  expert in
         providing such valuations retained by the Company.

         The  Subscriber  represents  and  warrants  that  it  qualifies  as  an
"accredited  investor"  under Rule 501(a) of Regulation D promulgated  under the
Securities Act of 1933, as amended (the "Securities Act").

         The  Subscriber  hereby  agrees  to pay  an  aggregate  of Two  Hundred
Thousand  Dollars  ($200,000.00) as subscription for and in consideration of the
issuance of the Note being acquired pursuant hereto.

         The Subscriber hereby acknowledges that it has retained its own counsel
and/or other professional advisors to review and evaluate the economic,  tax and
other consequences of an investment in the Company, to the extent the Subscriber
has deemed necessary.

         The  Subscriber  acknowledges  that:  (i)  neither  the  Note  nor  the
securities issuable upon conversion thereof and default thereunder have been the
subject of registration under the Securities Act, the federal securities laws or
the laws of any state;  (ii) absent an exemption  from  registration  under such
laws,  the  issuance  and sale of the Note  (and the  securities  issuable  upon
conversion thereof and default thereunder) would require registration; (iii) the
Company and NEWCO-OPTO are and will be issuing such  securities in reliance upon
exemption from the  registration  requirements  of the Securities  Act; and (iv)
reliance by the Company and  NEWCO-OPTO  upon such  exemption  is based upon the
Subscriber's  representation,  warranties,  and  agreements  contained  in  this
Subscription Agreement.

                                       1

<PAGE>



         SECTION 1.      The Subscriber represents, warrants, acknowledges and
agrees as follows:

     A. Subject to applicable laws, rules and regulations, the Subscriber agrees
that the subscription  evidenced by this Subscription  Agreement is and shall be
irrevocable.

     B. The  Subscriber  has  received and  carefully  read the  following:  (i)
certain general business  information about the Company;  (ii) any and all other
information  deemed by the Subscriber to be necessary to verify the accuracy and
completeness of the  representations,  warranties and covenants made herein; and
(iii)  written or verbal  responses for all questions  that the  Subscriber  has
submitted to the Company  regarding an  investment in the  securities  described
herein,  all of which the  Subscriber  acknowledges  have been  provided  to the
Subscriber  (the "Corporate  Materials").  The Subscriber has not been furnished
with any other  materials  or  literature  relating to the offer and sale of the
securities described herein, other than the Corporate Materials.  The Subscriber
is fully aware of the financial condition of the Company, in particular the lack
of  working  capital  and other  financial  distress  being  experienced  by the
Company.  The Subscriber has been given the  opportunity to ask questions of and
to receive  answers from the Company  concerning the terms and conditions of the
offer and sale of the securities  described herein and the Corporate  Materials,
and to obtain  such  additional  written  information  necessary  to verify  the
accuracy of same as the Subscriber desires in order to evaluate an investment in
the securities  described herein. The Subscriber  acknowledges and confirms that
the written and/or verbal responses provided to the Subscriber by the Company in
response to the Subscriber's questions are not contrary to or inconsistent with,
nor do they in any way conflict with the  information set forth in the Corporate
Materials.  The Subscriber  further  acknowledges  that it fully understands the
information  contained in Corporate  Materials  and has had the  opportunity  to
discuss any  questions  regarding the  Corporate  Materials  with its counsel or
other advisor.  Notwithstanding  the foregoing,  the only information upon which
the Subscriber  has relied is that set forth in the Corporate  Materials and its
own independent  investigation.  The Subscriber acknowledges that the Subscriber
has received no  representations  or warranties from the Company,  or any of its
employees or agents in making an investment  decision related to the acquisition
of the securities described herein, other than as set forth herein.

     C. The Subscriber is aware that the acquisition of the securities described
herein is a  speculative  investment  involving  a high  degree of risk and that
there is no  guarantee  that  the  Subscriber  will  realize  any  gain  from an
investment in such  securities.  The  Subscriber  further  understands  that the
Subscriber could lose the entire amount of the  Subscriber's  investment in such
securities.  The Subscriber  acknowledges  that the Subscriber has  specifically
reviewed  the  Corporate  Materials  with  a view  toward  subscribing  for  the
securities described herein.

     D. The  Subscriber  understands  that no federal  or state  agency or other
authority  (within  or outside of the  United  States)  has made any  finding or
determination  regarding the fairness of the offer,  sale and/or issuance of the
securities  described herein,  has made any recommendation or endorsement of the
offer and sale of the securities  described herein or has passed in any way upon
this Subscription Agreement or the other Corporate Materials.

                                       2



<PAGE>



     E. The Subscriber:  (i) is acquiring the securities described herein solely
for the  Subscriber's  own account for  investment  purposes only and not with a
view toward resale or distribution thereof, either in whole or in part; (ii) has
no  contract,  undertaking,  agreement  or other  arrangement,  in  existence or
contemplated,  to sell,  pledge,  assign or otherwise transfer the securities to
any other person or entity;  and (iii) agrees not to sell or otherwise  transfer
such  securities  unless and until they are  subsequently  registered  under the
Securities Act and any applicable  state securities laws, or unless an exemption
from any such requirement is available.

     F. The  Subscriber has read, is familiar with and  understands  Rule 501 of
Regulation D and represents  that the Subscriber is an "accredited  investor" as
defined in Rule 501(a) of Regulation D under the Securities Act.
 
     G. The  Subscriber  is  financially  able to bear the  economic  risk of an
investment in the  securities  described  herein,  including the ability to hold
such securities  indefinitely  and to afford a complete loss of the Subscriber's
investment in such securities.

     H. The Subscriber's overall commitment to investments which are not readily
marketable  is not  disproportionate  to the  Subscriber's  net  worth,  and the
Subscriber's  investment in the securities  described herein will not cause such
overall  commitment to become  excessive.  The Subscriber  understands  that the
statutory basis on which such  securities are being offered,  sold and/or issued
to the Subscriber would not be available if the Subscriber's  present  intention
were to hold such  securities for a fixed period of time or until the occurrence
of a certain event. The Subscriber  realizes that, in view of the Securities and
Exchange Commission (the "Commission"),  a purchase of such securities now, with
a present intention to resell by reason of a foreseeable specific contingency or
any  anticipated  change  in the  market  value  of such  securities,  or in the
condition  of the Company or that of the  industry in which the  business of the
Company  is  engaged  or in  connection  with  a  contemplated  liquidation,  or
settlement of any loan obtained by the  Subscriber  for the  acquisition of such
securities,  and for which such  securities  may be pledged as a security  or as
donations to religious or charitable  institutions for the purpose of securing a
deduction on an income tax return, would, in fact, constitute a purchase with an
intention inconsistent with the Subscriber's  representations to the Company and
the  Commission  would then  regard such  purchase  as a purchase  for which the
exemption from registration  under the Securities Act relied upon by the Company
in connection herewith is not available.

     I. The funds  provided for the  Subscriber's  investment in the  securities
described herein are either the separate  property of the Subscriber,  community
property over which the Subscriber has the right of control,  or are funds as to
which the Subscriber otherwise has the sole right of control, or are funds as to
which the Subscriber otherwise has the sole right of management.

     J.  The  Subscriber  was not  organized  or  reorganized  for the  specific
purposes of acquiring the securities  described  herein;  the Subscriber has the
full power and  authority  to execute this  Subscription  Agreement on behalf of
such entity and to make the  representations  and warranties  made herein on its
behalf; and an investment in the securities described herein has

                                       3

<PAGE>



been affirmatively authorized, if required, by the governing body of such entity
and is not prohibited by the governing documents of the entity.

     K. The following  address is the Subscriber's  principal  business address:
c/o Essex Corporation, 9150 Guilford Road, Columbia, MD 21046.

     L. The  Subscriber  has such  knowledge  and  experience  in financial  and
business  matters  as to be  capable  of  evaluating  the merits and risks of an
investment in the securities described herein.

     M. The Note and the  certificates  evidencing  the  shares of Common  Stock
described herein will contain a legend substantially as follows:

THE  SECURITIES  WHICH  ARE  REPRESENTED  HEREBY  HAVE NOT BEEN THE  SUBJECT  OF
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  AND MAY NOT BE SOLD,
TRANSFERRED,  ASSIGNED,  PLEDGED,  HYPOTHECATED OR OTHERWISE DISPOSED OF UNTIL A
REGISTRATION  STATEMENT WITH RESPECT  THERETO IS DECLARED AND REMAINS  EFFECTIVE
UNDER SUCH ACT,  OR THE  COMPANY  RECEIVES AN OPINION OF COUNSEL FOR THE COMPANY
THAT AN EXEMPTION FROM REGISTRATION REQUIREMENTS OF SUCH ACT IS AVAILABLE.

     The Subscriber  further  acknowledges that: (i) any necessary stop transfer
orders will be placed upon the certificates for the securities  described herein
in accordance  with  Securities Act; and (ii) the Company is under no obligation
to  aid  the  Subscriber  in  obtaining  any  exemption  from  the  registration
requirements of the Securities Act or any jurisdiction.

     N. In no event will the  Subscriber  sell or otherwise  transfer any of the
securities  described herein other than in accordance with the terms thereof and
applicable law.

     O. All  information  which  the  Subscriber  has  provided  concerning  the
Subscriber,  the Subscriber's  financial position and the Subscriber's knowledge
of financial and business matters is correct and complete as of the date hereof,
and if there  should be any  change in such  information,  the  Subscriber  will
immediately provide such new information.

     P. In connection with the offer and sale of the securities described herein
to the  Subscriber,  the  Company is and will be relying  upon the  Subscriber's
representations and warranties as contained in this Subscription Agreement.

     Q. The Subscriber  acknowledges that the Subscriber understands the meaning
and legal consequences of the representations and warranties which are contained
herein and hereby  agrees to  indemnify,  save and hold the  Company and the its
officers, directors,  employees, agents and affiliates harmless from and against
any and all claims or actions  arising out of a breach by the  Subscriber of any
representation,  warranty,  acknowledgment,  term or condition contained in this
Subscription Agreement. Such indemnification shall be deemed to include not only
the specific  liabilities or obligations with respect to which such indemnity is
provided, but

                                       4

<PAGE>


     also  all  reasonable  costs,  expenses,   counsel  fees  and  expenses  of
settlement  relating  thereto,  whether or not any such  liability or obligation
shall have been reduced to judgment.  THE PARTIES  HERETO HAVE EACH BEEN ADVISED
THAT THE  INDEMNIFICATION  DESCRIBED HEREIN MAY BE VOID AS AGAINST PUBLIC POLICY
AND UNENFORCEABLE IN SOME JURISDICTIONS.

     SECTION 2. The Company  represents,  warrants,  acknowledges  and agrees as
follows:

     A. The execution,  delivery and performance of this Subscription  Agreement
and  consummation  of  the  transactions  contemplated  hereby  have  been  duly
authorized,  adopted and  approved by its board of  directors.  It has taken all
necessary  corporate  action and has all the necessary  corporate power to enter
into this Subscription Agreement and to consummate the transactions contemplated
hereby.  This  Subscription  Agreement  has been duly and validly  executed  and
delivered by its officers on its behalf,  and  assuming  that this  Subscription
Agreement is the valid and binding  obligation of the  Subscriber,  is the valid
and binding  obligation  of the Company  enforceable  against each in accordance
with  its  terms,  except  as such  enforcement  may be  limited  by  applicable
bankruptcy, insolvency, reorganization,  moratorium or other similar laws now or
hereafter  in  effect,  or by  legal or  equitable  principles,  relating  to or
limiting  creditors'  rights  generally  and except  that the remedy of specific
performance  and injunctive  and other forms of equitable  relief are subject to
certain  equitable  defenses and to the discretion of the court before which any
proceeding therefor may be brought.

     B.  It is a  corporation  duly  organized,  validly  existing  and in  good
standing  under  the  laws  of the  jurisdiction  of its  formation.  It has the
corporate  power and authority to own and lease its properties and assets and to
carry on its business as it is now being conducted.

     C. There is no action, suit, proceeding or investigation pending against or
related to it, to the best of its knowledge, nor has it been threatened with any
such action, suit, proceeding or investigation, which would restrict its ability
to perform its  obligations  hereunder  or which  would have a material  adverse
effect on its business,  assets,  operations,  earnings,  prospects or condition
(financial or otherwise). To the best of its knowledge, there are no grounds for
or facts,  events or circumstances which would form the basis of any such action
that would cause or result in any such action, suit, proceeding or investigation
or which is  probable  of  assertion.  It is not in  default  in  respect of any
judgment,  order,  writ,  injunction  or decree  of any  court or any  national,
federal, provincial, state, local or other governmental agency, authority, body,
board,  bureau,  commission,  department or  instrumentality  which could have a
material adverse effect on its business, assets, operations, earnings, prospects
or condition (financial or otherwise).

     D. No statement by it as set forth herein and no statement set forth in any
certificate  or other  instrument or document  required to be delivered by or on
behalf  of it  pursuant  hereto  or  in  connection  with  consummation  of  the
transactions contemplated hereby, contained, contains or will contain any untrue
statement  of a  material  fact,  or  omitted,  omits or will  omit to state any
material  fact which is necessary  to make the  statements  contained  herein or
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.

                                       5


<PAGE>



     E.  The  execution,  delivery  and  performance  by  the  Company  of  this
Subscription  Agreement  and  the  Note  and  the  consummation  by  them of the
transactions contemplated hereby and thereby, including, without limitation, the
issuance,  sale and delivery of the Note,  do not require the  consent,  waiver,
approval, license or authorization of or filing of any notice or report with any
person,  entity or public authority and will not violate,  result in a breach of
or the acceleration of any obligation  under, or constitute a default under, any
provision  of  their  respective   organizational   documents  or  any  material
indenture,  mortgage,  lien,  lease,  agreement,  contract,  instrument,  order,
judgment,  decree,  law,  ordinance or  regulation  to which any property of the
Company  is  subject  or by which  either  such  party is bound or result in the
creation  or  imposition  of any lien,  claim,  charge,  restriction,  equity or
encumbrance  of any  kind  whatsoever  upon,  or give to any  other  person  any
interest  or  right  in or  with  respect  to,  any of the  properties,  assets,
business, agreements or contracts of the Company.

     SECTION 3. Except as  otherwise  specifically  provided for  hereunder,  no
party  shall be deemed to have  waived any of his,  her or its rights  hereunder
unless  such waiver is in writing  and signed by the party  waiving  said right.
Except as otherwise specifically provided for hereunder, no delay or omission by
any party in  exercising  any right with  respect to the subject  matter  hereof
shall operate as a waiver of such right or of any such other right.  A waiver on
any one  occasion  with  respect  to the  subject  matter  hereof  shall  not be
construed  as a bar to or waiver of any right or remedy on any future  occasion.
All rights and remedies with respect to the subject  matter hereof be cumulative
and may be exercised separately or concurrently.

     SECTION  4. None of the  parties  hereto  has made any  representations  or
warranties  with respect to the subject matter hereof not set forth herein or in
the  Note.  This  Subscription  Agreement  and the Note  constitute  the  entire
agreement  between the parties hereto with respect to the subject matter hereof.
All understandings and agreements which heretofore may have existed or did exist
between  the  parties  hereto  with  respect to the  subject  matter  hereof are
superseded by this Subscription Agreement and the Note.

     SECTION  5.  This  Subscription  Agreement  may not be  changed,  modified,
extended or  terminated  other than by an  agreement  in writing,  signed by the
parties hereto.

     SECTION  6. The  parties  hereto  agree to  execute  any and all such other
documents and to take any and all such further  actions  reasonably  required to
effectuate the agreement evidenced by this Subscription Agreement and the intent
and purposes hereof.

     SECTION 7. This  Subscription  Agreement shall be governed by and construed
     in accordance with the laws of the State of Maryland  without regard to the
     principles of conflicts of laws thereof.  The Subscriber hereby consents to
     the  jurisdiction  of the state courts of and federal courts located in the
     State of Maryland.

     SECTION 8. This Subscription  Agreement,  including the representations and
warranties  contained  herein,  shall be binding  upon the  Subscriber's  heirs,
executors,  administrators,  representatives,  successors  and  assigns  (to the
extent assignment may be permitted hereunder).

                                    * * * * *

                                       6


<PAGE>





         IN WITNESS  WHEREOF,  the  Subscriber  has executed  this  Subscription
Agreement this 24th day of June, 1997.


                       NAME OF SUBSCRIBER

                       Harry Letaw Jr. and Joyce W. Letaw Ten Ent.
                       -------------------------------------------



         In   consideration   of  and  in  reliance  upon  the  foregoing,   the
subscription  and purchase  described herein is hereby accepted this 24th day of
June, 1997 by the undersigned.


                        ESSEX CORPORATION


                         By:      Joseph R. Kurry, Jr.
                                  --------------------
                                  Joseph R. Kurry, Jr., Chief Financial Officer


                                       7










                                  EXHIBIT 10.17

          Subscription Agreement Between the Company and Samuel Hopkins




<PAGE>



                                ESSEX CORPORATION

                     PROMISSORY NOTE SUBSCRIPTION AGREEMENT

THE SECURITIES  DESCRIBED  HEREIN HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES
ACT OF 1933, AS AMENDED,  NOR HAS THIS  SUBSCRIPTION  AGREEMENT  BEEN  REVIEWED,
APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE  COMMISSION,  NOR HAS THE
COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THE  INFORMATION  SET FORTH
HEREIN. NO STATE SECURITIES LAW ADMINISTRATOR OR OTHER JURISDICTIONAL  AUTHORITY
HAS PASSED UPON OR ENDORSED THE MERITS HEREOF OR THE ACCURACY OR THE ADEQUACY OF
THE  INFORMATION  SET  FORTH  HEREIN.  ANY  REPRESENTATION  TO THE  CONTRARY  IS
UNLAWFUL.

THE  SECURITIES  DESCRIBED  HEREIN HAVE BEEN OFFERED AND MADE  AVAILABLE ONLY TO
INVESTORS WHO QUALIFY AS "ACCREDITED  INVESTORS," AS DEFINED IN REGULATION D AND
RULE  501  PROMULGATED  UNDER  THE  SECURITIES  ACT OF  1933,  AS  AMENDED.  THE
SECURITIES  DESCRIBED  HEREIN WERE  OFFERED  PURSUANT TO AN  EXEMPTION  FROM THE
REGISTRATION  REQUIREMENTS  OF THE  SECURITIES  ACT OF  1933,  AS  AMENDED,  AND
APPLICABLE STATE SECURITIES LAWS FOR NON-PUBLIC OFFERINGS. SUCH EXEMPTIONS LIMIT
THE  NUMBER AND TYPES OF  SUBSCRIBERS  TO WHICH THE  OFFERING  HAS BEEN MADE AND
RESTRICT SUBSEQUENT TRANSFER OF THE SECURITIES DESCRIBED HEREIN.

THE  SECURITIES  DESCRIBED  HEREIN SHOULD BE CONSIDERED  ONLY BY A PERSON WHO OR
ENTITY  THAT  CAN  AFFORD  TO  SUSTAIN  THE  LOSS OF ITS  ENTIRE  INVESTMENT.  A
SUBSCRIBER WHO  SUBSCRIBES TO MAKE AN INVESTMENT IN SUCH  SECURITIES IS REQUIRED
TO  REPRESENT  THAT IT IS ABLE TO SUSTAIN  SUCH A LOSS AND IS FAMILIAR  WITH AND
UNDERSTANDS THE TERMS OF THE OFFERING OF THE SECURITIES DESCRIBED HEREIN.

THE SECURITIES  DESCRIBED HEREIN ARE RESTRICTED WITH RESPECT TO  TRANSFERABILITY
AND RESALE.  THE  SECURITIES  MAY NOT BE RESOLD OR OTHERWISE  DISPOSED OF BY THE
SUBSCRIBER  UNLESS,  IN THE  OPINION OF  COUNSEL  SATISFACTORY  TO THE  COMPANY,
REGISTRATION  UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE STATE
SECURITIES  LAWS IS NOT REQUIRED OR  COMPLIANCE  IS MADE WITH SUCH  REGISTRATION
REQUIREMENTS.

THE  SUBSCRIBER,  BY HAVING  ACCEPTED  DELIVERY OF THE  INFORMATIONAL  MATERIALS
PROVIDED BY THE COMPANY AND ALL  ACCOMPANYING  OR RELATED  DOCUMENTS,  AGREES TO
RETURN SUCH MATERIALS TO THE COMPANY UPON REQUEST IF THE  SUBSCRIBER  DETERMINES
NOT TO MAKE AN INVESTMENT IN ANY OF THE SECURITIES DESCRIBED HEREIN.


                                       i

<PAGE>



THIS SUBSCRIPTION AGREEMENT DOES NOT CONSTITUTE AN OFFER OR
SOLICITATION BY ANYONE IN ANY JURISDICTION IN WHICH SUCH AN OFFER
OR SOLICITATION IS NOT AUTHORIZED.

                             FOR FLORIDA RESIDENTS:

THE  SECURITIES  OFFERED  HEREBY WILL BE SOLD,  AND  ACQUIRED,  IN A TRANSACTION
EXEMPT  UNDER  SECTION  517.061(11)  OF  THE  FLORIDA  SECURITIES  AND  INVESTOR
PROTECTION ACT. THE SECURITIES  HAVE NOT BEEN  REGISTERED  UNDER SAID ACT IN THE
STATE OF FLORIDA.  PURSUANT TO SECTION 517.061(11) OF THE FLORIDA SECURITIES AND
INVESTOR  PROTECTION  ACT,  WHEN  SALES  ARE  MADE TO FIVE  (5) OR MORE  PERSONS
(EXCLUDING  ACCREDITED INVESTORS) IN THE STATE OF FLORIDA, ANY SALE IN THE STATE
OF FLORIDA MADE PURSUANT TO SECTION  517.061(11)  OF SUCH ACT IS VOIDABLE BY THE
PURCHASER IN SUCH SALE (WITHOUT INCURRING ANY LIABILITY TO THE COMPANY OR TO ANY
OTHER PERSON OR ENTITY)  EITHER  WITHIN THREE (3) DAYS AFTER THE FIRST TENDER OF
CONSIDERATION  IS MADE BY SUCH PURCHASER TO THE ISSUER,  AN AGENT OF THE ISSUER,
OR AN ESCROW  AGENT OR  WITHIN  THREE (3) DAYS  AFTER THE  AVAILABILITY  OF THAT
PRIVILEGE IS COMMUNICATED TO SUCH PURCHASER, WHICHEVER OCCURS LATER. TO VOID HIS
PURCHASE,  THE  PURCHASER  NEED ONLY SEND A LETTER OR TELEGRAM TO THE COMPANY AT
THE ADDRESS  INDICATED  HEREIN.  ANY SUCH LETTER OR TELEGRAM  SHOULD BE SENT AND
POSTMARKED PRIOR TO THE END OF THE  AFOREMENTIONED  THREE (3) DAY PERIOD.  IT IS
PRUDENT TO SEND ANY SUCH LETTER BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED,  TO
ASSURE  THAT IT IS  RECEIVED  AND ALSO TO HAVE  EVIDENCE OF THE TIME THAT IT WAS
MAILED. SHOULD A PURCHASER MAKE THIS REQUEST ORALLY, THAT PURCHASER MUST ASK FOR
WRITTEN  CONFIRMATION  THAT THE  REQUEST  HAS BEEN  RECEIVED.  IF  NOTICE IS NOT
RECEIVED WITHIN THE TIME LIMIT SPECIFIED HEREIN, THE FOREGOING RIGHT TO VOID THE
PURCHASE SHALL BE NULL AND VOID.


                                       ii


<PAGE>




                             FOR MARYLAND RESIDENTS:

IN MAKING AN INVESTMENT DECISION INVESTORS MUST RELY ON THEIR OWN EXAMINATION OF
THE  ISSUER  AND THE  TERMS OF THE  OFFERING,  INCLUDING  THE  MERITS  AND RISKS
INVOLVED.  THESE  SECURITIES  HAVE NOT BEEN  RECOMMENDED BY ANY FEDERAL OR STATE
SECURITIES  COMMISSION  OR  REGULATORY  AUTHORITY.  FURTHERMORE,  THE  FOREGOING
AUTHORITIES  HAVE NOT CONFIRMED THE ACCURACY OR DETERMINED  THE ADEQUACY OF THIS
DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                             FOR VIRGINIA RESIDENTS:

THESE  SECURITIES HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED,  OR THE  VIRGINIA  SECURITIES  ACT,  BY REASON OF  SPECIFIC  EXEMPTIONS
THEREUNDER  RELATING  TO  THE  LIMITED  AVAILABILITY  OF  THE  OFFERING.   THESE
SECURITIES CANNOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF TO ANY PERSON OR
ENTITY  UNLESS  SUBSEQUENTLY  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933, AS
AMENDED,  OR THE SECURITIES ACT OF THIS STATE, IF SUCH REGISTRATION IS REQUIRED,
OR UNLESS AN EXEMPTION FROM SUCH REGISTRATION IS AVAILABLE.



                                      iii




<PAGE>



                                ESSEX CORPORATION

                     PROMISSORY NOTE SUBSCRIPTION AGREEMENT

         The  undersigned,  (the  "Subscriber")  hereby  subscribes to acquire a
Non-Negotiable  8%  Convertible  Promissory  Note (the  "Note")  issued by Essex
Corporation,  a Virginia corporation (the "Company"), in the principal amount of
Twenty Thousand Dollars  ($20,000.00)  substantially in the form attached hereto
as Exhibit A. The unpaid principal amount of this Note and the interest thereon,
shall be convertible at the option of the Subscriber  (the  "Conversion  Right")
prior to the  Maturity  Date,  in the  manner and on the terms  hereinafter  set
forth, into shares of common stock of the Company,  par value ($.10) at any time
prior to the Maturity Date at a conversion  price equal to the greater of market
value on the date that the election to convert is made or fifty cents ($.50) per
shares,  subject  to  adjustment  pursuant  to  Section 4 of the Note;  provided
however,  that in the event the assets of the  optoelectronics  division  of the
Company  have been  transferred  to  another  business  enterprise  in which the
Company  has a  controlling  shareholder  interest  ("Transferee"),  and  at the
election of the  Subscriber,  the unpaid  principal  amount of this Note and the
accrued interest thereon, shall be convertible into a percentage equity interest
of the Transferee determined pursuant to the following formula:

          x/y where x is the dollar  amount  converted  and y is the fair market
         value  (or  mean  fair  market  value,   if  more  than  one  valuation
         methodology  is  utilized)  as  determined  by a third party  expert in
         providing such valuations retained by the Company.

         The  Subscriber  represents  and  warrants  that  it  qualifies  as  an
"accredited  investor"  under Rule 501(a) of Regulation D promulgated  under the
Securities Act of 1933, as amended (the "Securities Act").

         The  Subscriber  hereby  agrees to pay an aggregate of Twenty  Thousand
($20,000.00) as  subscription  for and in  consideration  of the issuance of the
Note being acquired pursuant hereto.

         The Subscriber hereby acknowledges that it has retained its own counsel
and/or other professional advisors to review and evaluate the economic,  tax and
other consequences of an investment in the Company, to the extent the Subscriber
has deemed necessary.

         The  Subscriber  acknowledges  that:  (i)  neither  the  Note  nor  the
securities issuable upon conversion thereof and default thereunder have been the
subject of registration under the Securities Act, the federal securities laws or
the laws of any state;  (ii) absent an exemption  from  registration  under such
laws,  the  issuance  and sale of the Note  (and the  securities  issuable  upon
conversion thereof and default thereunder) would require registration; (iii) the
Company and NEWCO-OPTO are and will be issuing such  securities in reliance upon
exemption from the  registration  requirements  of the Securities  Act; and (iv)
reliance by the Company and  NEWCO-OPTO  upon such  exemption  is based upon the
Subscriber's  representation,  warranties,  and  agreements  contained  in  this
Subscription Agreement.

         SECTION 1.      The Subscriber represents, warrants, acknowledges and 
agrees as follows:


                                       1

<PAGE>




     A. Subject to applicable laws, rules and regulations, the Subscriber agrees
that the subscription  evidenced by this Subscription  Agreement is and shall be
irrevocable.

     B. The  Subscriber  has  received and  carefully  read the  following:  (i)
certain general business  information about the Company;  (ii) any and all other
information  deemed by the Subscriber to be necessary to verify the accuracy and
completeness of the  representations,  warranties and covenants made herein; and
(iii)  written or verbal  responses for all questions  that the  Subscriber  has
submitted to the Company  regarding an  investment in the  securities  described
herein,  all of which the  Subscriber  acknowledges  have been  provided  to the
Subscriber  (the "Corporate  Materials").  The Subscriber has not been furnished
with any other  materials  or  literature  relating to the offer and sale of the
securities described herein, other than the Corporate Materials.  The Subscriber
is fully aware of the financial condition of the Company, in particular the lack
of  working  capital  and other  financial  distress  being  experienced  by the
Company.  The Subscriber has been given the  opportunity to ask questions of and
to receive  answers from the Company  concerning the terms and conditions of the
offer and sale of the securities  described herein and the Corporate  Materials,
and to obtain  such  additional  written  information  necessary  to verify  the
accuracy of same as the Subscriber desires in order to evaluate an investment in
the securities  described herein. The Subscriber  acknowledges and confirms that
the written and/or verbal responses provided to the Subscriber by the Company in
response to the Subscriber's questions are not contrary to or inconsistent with,
nor do they in any way conflict with the  information set forth in the Corporate
Materials.  The Subscriber  further  acknowledges  that it fully understands the
information  contained in Corporate  Materials  and has had the  opportunity  to
discuss any  questions  regarding the  Corporate  Materials  with its counsel or
other advisor.  Notwithstanding  the foregoing,  the only information upon which
the Subscriber  has relied is that set forth in the Corporate  Materials and its
own independent  investigation.  The Subscriber acknowledges that the Subscriber
has received no  representations  or warranties from the Company,  or any of its
employees or agents in making an investment  decision related to the acquisition
of the securities described herein, other than as set forth herein.

     C. The Subscriber is aware that the acquisition of the securities described
herein is a  speculative  investment  involving  a high  degree of risk and that
there is no  guarantee  that  the  Subscriber  will  realize  any  gain  from an
investment in such  securities.  The  Subscriber  further  understands  that the
Subscriber could lose the entire amount of the  Subscriber's  investment in such
securities.  The Subscriber  acknowledges  that the Subscriber has  specifically
reviewed  the  Corporate  Materials  with  a view  toward  subscribing  for  the
securities described herein.

     D. The  Subscriber  understands  that no federal  or state  agency or other
authority  (within  or outside of the  United  States)  has made any  finding or
determination  regarding the fairness of the offer,  sale and/or issuance of the
securities  described herein,  has made any recommendation or endorsement of the
offer and sale of the securities  described herein or has passed in any way upon
this Subscription Agreement or the other Corporate Materials.

     E. The Subscriber:  (i) is acquiring the securities described herein solely
for the  Subscriber's  own account for  investment  purposes only and not with a
view toward resale or distribution thereof, either in whole or in part; (ii) has
no contract, undertaking, agreement or

                                       2

<PAGE>



other  arrangement,  in existence or contemplated,  to sell,  pledge,  assign or
otherwise  transfer  the  securities  to any other  person or entity;  and (iii)
agrees not to sell or otherwise  transfer such securities  unless and until they
are  subsequently  registered  under the Securities Act and any applicable state
securities laws, or unless an exemption from any such requirement is available.

     F. The  Subscriber has read, is familiar with and  understands  Rule 501 of
Regulation D and represents  that the Subscriber is an "accredited  investor" as
defined in Rule 501(a) of Regulation D under the Securities Act.

     G. The  Subscriber  is  financially  able to bear the  economic  risk of an
investment in the  securities  described  herein,  including the ability to hold
such securities  indefinitely  and to afford a complete loss of the Subscriber's
investment in such securities.

     H. The Subscriber's overall commitment to investments which are not readily
marketable  is not  disproportionate  to the  Subscriber's  net  worth,  and the
Subscriber's  investment in the securities  described herein will not cause such
overall  commitment to become  excessive.  The Subscriber  understands  that the
statutory basis on which such  securities are being offered,  sold and/or issued
to the Subscriber would not be available if the Subscriber's  present  intention
were to hold such  securities for a fixed period of time or until the occurrence
of a certain event. The Subscriber  realizes that, in view of the Securities and
Exchange Commission (the "Commission"),  a purchase of such securities now, with
a present intention to resell by reason of a foreseeable specific contingency or
any  anticipated  change  in the  market  value  of such  securities,  or in the
condition  of the Company or that of the  industry in which the  business of the
Company  is  engaged  or in  connection  with  a  contemplated  liquidation,  or
settlement of any loan obtained by the  Subscriber  for the  acquisition of such
securities,  and for which such  securities  may be pledged as a security  or as
donations to religious or charitable  institutions for the purpose of securing a
deduction on an income tax return, would, in fact, constitute a purchase with an
intention inconsistent with the Subscriber's  representations to the Company and
the  Commission  would then  regard such  purchase  as a purchase  for which the
exemption from registration  under the Securities Act relied upon by the Company
in connection herewith is not available.

     I. The funds  provided for the  Subscriber's  investment in the  securities
described herein are either the separate  property of the Subscriber,  community
property over which the Subscriber has the right of control,  or are funds as to
which the Subscriber otherwise has the sole right of control, or are funds as to
which the Subscriber otherwise has the sole right of management.

     J.  The  Subscriber  was not  organized  or  reorganized  for the  specific
purposes of acquiring the securities  described  herein;  the Subscriber has the
full power and  authority  to execute this  Subscription  Agreement on behalf of
such entity and to make the  representations  and warranties  made herein on its
behalf;  and  an  investment  in  the  securities   described  herein  has  been
affirmatively  authorized, if required, by the governing body of such entity and
is not prohibited by the governing documents of the entity.

                                       3


<PAGE>



     K. The following address is the Subscriber's principal business address: 45
Warrenton Road, Baltimore, Maryland, 21210.

     L. The  Subscriber  has such  knowledge  and  experience  in financial  and
business  matters  as to be  capable  of  evaluating  the merits and risks of an
investment in the securities described herein.

     M. The Note and the  certificates  evidencing  the  shares of Common  Stock
described herein will contain a legend substantially as follows:

THE  SECURITIES  WHICH  ARE  REPRESENTED  HEREBY  HAVE NOT BEEN THE  SUBJECT  OF
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  AND MAY NOT BE SOLD,
TRANSFERRED,  ASSIGNED,  PLEDGED,  HYPOTHECATED OR OTHERWISE DISPOSED OF UNTIL A
REGISTRATION  STATEMENT WITH RESPECT  THERETO IS DECLARED AND REMAINS  EFFECTIVE
UNDER SUCH ACT,  OR THE  COMPANY  RECEIVES AN OPINION OF COUNSEL FOR THE COMPANY
THAT AN EXEMPTION FROM REGISTRATION REQUIREMENTS OF SUCH ACT IS AVAILABLE.

     The Subscriber  further  acknowledges that: (i) any necessary stop transfer
orders will be placed upon the certificates for the securities  described herein
in accordance  with  Securities Act; and (ii) the Company is under no obligation
to  aid  the  Subscriber  in  obtaining  any  exemption  from  the  registration
requirements of the Securities Act or any jurisdiction.

     N. In no event will the  Subscriber  sell or otherwise  transfer any of the
securities  described herein other than in accordance with the terms thereof and
applicable law.

     O. All  information  which  the  Subscriber  has  provided  concerning  the
Subscriber,  the Subscriber's  financial position and the Subscriber's knowledge
of financial and business matters is correct and complete as of the date hereof,
and if there  should be any  change in such  information,  the  Subscriber  will
immediately provide such new information.

     P. In connection with the offer and sale of the securities described herein
to the  Subscriber,  the  Company is and will be relying  upon the  Subscriber's
representations and warranties as contained in this Subscription Agreement.

         Q. The  Subscriber  acknowledges  that the Subscriber  understands  the
     meaning and legal consequences of the  representations and warranties which
are contained  herein and hereby agrees to indemnify,  save and hold the Company
and the its officers, directors,  employees, agents and affiliates harmless from
and  against  any and all  claims  or  actions  arising  out of a breach  by the
Subscriber of any representation,  warranty,  acknowledgment,  term or condition
contained in this Subscription  Agreement.  Such indemnification shall be deemed
to include not only the  specific  liabilities  or  obligations  with respect to
which such  indemnity  is provided,  but also all  reasonable  costs,  expenses,
counsel fees and expenses of  settlement  relating  thereto,  whether or not any
such  liability or obligation  shall have been reduced to judgment.  THE PARTIES
HERETO HAVE EACH BEEN ADVISED THAT THE INDEMNIFICATION

                                       4

<PAGE>



DESCRIBED HEREIN MAY BE VOID AS AGAINST PUBLIC POLICY AND  UNENFORCEABLE IN SOME
JURISDICTIONS.

     SECTION 2. The Company  represents,  warrants,  acknowledges  and agrees as
follows:

     A. The execution,  delivery and performance of this Subscription  Agreement
and  consummation  of  the  transactions  contemplated  hereby  have  been  duly
authorized,  adopted and  approved by its board of  directors.  It has taken all
necessary  corporate  action and has all the necessary  corporate power to enter
into this Subscription Agreement and to consummate the transactions contemplated
hereby.  This  Subscription  Agreement  has been duly and validly  executed  and
delivered by its officers on its behalf,  and  assuming  that this  Subscription
Agreement is the valid and binding  obligation of the  Subscriber,  is the valid
and binding  obligation  of the Company  enforceable  against each in accordance
with  its  terms,  except  as such  enforcement  may be  limited  by  applicable
bankruptcy, insolvency, reorganization,  moratorium or other similar laws now or
hereafter  in  effect,  or by  legal or  equitable  principles,  relating  to or
limiting  creditors'  rights  generally  and except  that the remedy of specific
performance  and injunctive  and other forms of equitable  relief are subject to
certain  equitable  defenses and to the discretion of the court before which any
proceeding therefor may be brought.

     B.  It is a  corporation  duly  organized,  validly  existing  and in  good
standing  under  the  laws  of the  jurisdiction  of its  formation.  It has the
corporate  power and authority to own and lease its properties and assets and to
carry on its business as it is now being conducted.

     C. There is no action, suit, proceeding or investigation pending against or
related to it, to the best of its knowledge, nor has it been threatened with any
such action, suit, proceeding or investigation, which would restrict its ability
to perform its  obligations  hereunder  or which  would have a material  adverse
effect on its business,  assets,  operations,  earnings,  prospects or condition
(financial or otherwise). To the best of its knowledge, there are no grounds for
or facts,  events or circumstances which would form the basis of any such action
that would cause or result in any such action, suit, proceeding or investigation
or which is  probable  of  assertion.  It is not in  default  in  respect of any
judgment,  order,  writ,  injunction  or decree  of any  court or any  national,
federal, provincial, state, local or other governmental agency, authority, body,
board,  bureau,  commission,  department or  instrumentality  which could have a
material adverse effect on its business, assets, operations, earnings, prospects
or condition (financial or otherwise).

     D. No statement by it as set forth herein and no statement set forth in any
certificate  or other  instrument or document  required to be delivered by or on
behalf  of it  pursuant  hereto  or  in  connection  with  consummation  of  the
transactions contemplated hereby, contained, contains or will contain any untrue
statement  of a  material  fact,  or  omitted,  omits or will  omit to state any
material  fact which is necessary  to make the  statements  contained  herein or
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.

     E.  The  execution,  delivery  and  performance  by  the  Company  of  this
Subscription  Agreement  and  the  Note  and  the  consummation  by  them of the
transactions contemplated hereby and thereby, including, without limitation, the
issuance, sale and delivery of the Note, do not


                                       5
<PAGE>



require the consent, waiver, approval,  license or authorization of or filing of
any notice or report with any person,  entity or public  authority  and will not
violate,  result in a breach of or the acceleration of any obligation  under, or
constitute a default  under,  any provision of their  respective  organizational
documents or any material indenture, mortgage, lien, lease, agreement, contract,
instrument,  order, judgment,  decree, law, ordinance or regulation to which any
property  of the  Company is subject or by which  either  such party is bound or
result in the creation or imposition of any lien,  claim,  charge,  restriction,
equity or encumbrance of any kind  whatsoever  upon, or give to any other person
any  interest  or right in or with  respect to, any of the  properties,  assets,
business, agreements or contracts of the Company.

     SECTION 3. Except as  otherwise  specifically  provided for  hereunder,  no
party  shall be deemed to have  waived any of his,  her or its rights  hereunder
unless  such waiver is in writing  and signed by the party  waiving  said right.
Except as otherwise specifically provided for hereunder, no delay or omission by
any party in  exercising  any right with  respect to the subject  matter  hereof
shall operate as a waiver of such right or of any such other right.  A waiver on
any one  occasion  with  respect  to the  subject  matter  hereof  shall  not be
construed  as a bar to or waiver of any right or remedy on any future  occasion.
All rights and remedies with respect to the subject  matter hereof be cumulative
and may be exercised separately or concurrently.

     SECTION  4. None of the  parties  hereto  has made any  representations  or
warranties  with respect to the subject matter hereof not set forth herein or in
the  Note.  This  Subscription  Agreement  and the Note  constitute  the  entire
agreement  between the parties hereto with respect to the subject matter hereof.
All understandings and agreements which heretofore may have existed or did exist
between  the  parties  hereto  with  respect to the  subject  matter  hereof are
superseded by this Subscription Agreement and the Note.

     SECTION  5.  This  Subscription  Agreement  may not be  changed,  modified,
extended or  terminated  other than by an  agreement  in writing,  signed by the
parties hereto.

     SECTION  6. The  parties  hereto  agree to  execute  any and all such other
documents and to take any and all such further  actions  reasonably  required to
effectuate the agreement evidenced by this Subscription Agreement and the intent
and purposes hereof.

     SECTION 7. This  Subscription  Agreement shall be governed by and construed
in  accordance  with the laws of the  State of  Maryland  without  regard to the
principles of conflicts of laws thereof.  The Subscriber  hereby consents to the
jurisdiction  of the state courts of and federal  courts located in the State of
Maryland.

     SECTION 8. This Subscription  Agreement,  including the representations and
warranties  contained  herein,  shall be binding  upon the  Subscriber's  heirs,
executors,  administrators,  representatives,  successors  and  assigns  (to the
extent assignment may be permitted hereunder).

                                    * * * * *


                                       6


<PAGE>




         IN WITNESS  WHEREOF,  the  Subscriber  has executed  this  Subscription
Agreement this 24th day of June, 1997.


                                 NAME OF SUBSCRIBER

                                 Samuel Hopkins
                                 --------------




         In   consideration   of  and  in  reliance  upon  the  foregoing,   the
subscription  and purchase  described herein is hereby accepted this 24th day of
June, 1997 by the undersigned.


                                 ESSEX CORPORATION


                                 By:      Joseph R. Kurry, Jr.
                                 -----------------------------
                                 Joseph R. Kurry, Jr., Chief Financial Officer




                                       7






                                  EXHIBIT 10.18

         Subscription Agreement Between the Company and Harold P. Hanson





<PAGE>



                                ESSEX CORPORATION

                     PROMISSORY NOTE SUBSCRIPTION AGREEMENT

THE SECURITIES  DESCRIBED  HEREIN HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES
ACT OF 1933, AS AMENDED,  NOR HAS THIS  SUBSCRIPTION  AGREEMENT  BEEN  REVIEWED,
APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE  COMMISSION,  NOR HAS THE
COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THE  INFORMATION  SET FORTH
HEREIN. NO STATE SECURITIES LAW ADMINISTRATOR OR OTHER JURISDICTIONAL  AUTHORITY
HAS PASSED UPON OR ENDORSED THE MERITS HEREOF OR THE ACCURACY OR THE ADEQUACY OF
THE  INFORMATION  SET  FORTH  HEREIN.  ANY  REPRESENTATION  TO THE  CONTRARY  IS
UNLAWFUL.

THE  SECURITIES  DESCRIBED  HEREIN HAVE BEEN OFFERED AND MADE  AVAILABLE ONLY TO
INVESTORS WHO QUALIFY AS "ACCREDITED  INVESTORS," AS DEFINED IN REGULATION D AND
RULE  501  PROMULGATED  UNDER  THE  SECURITIES  ACT OF  1933,  AS  AMENDED.  THE
SECURITIES  DESCRIBED  HEREIN WERE  OFFERED  PURSUANT TO AN  EXEMPTION  FROM THE
REGISTRATION  REQUIREMENTS  OF THE  SECURITIES  ACT OF  1933,  AS  AMENDED,  AND
APPLICABLE STATE SECURITIES LAWS FOR NON-PUBLIC OFFERINGS. SUCH EXEMPTIONS LIMIT
THE  NUMBER AND TYPES OF  SUBSCRIBERS  TO WHICH THE  OFFERING  HAS BEEN MADE AND
RESTRICT SUBSEQUENT TRANSFER OF THE SECURITIES DESCRIBED HEREIN.

THE  SECURITIES  DESCRIBED  HEREIN SHOULD BE CONSIDERED  ONLY BY A PERSON WHO OR
ENTITY  THAT  CAN  AFFORD  TO  SUSTAIN  THE  LOSS OF ITS  ENTIRE  INVESTMENT.  A
SUBSCRIBER WHO  SUBSCRIBES TO MAKE AN INVESTMENT IN SUCH  SECURITIES IS REQUIRED
TO  REPRESENT  THAT IT IS ABLE TO SUSTAIN  SUCH A LOSS AND IS FAMILIAR  WITH AND
UNDERSTANDS THE TERMS OF THE OFFERING OF THE SECURITIES DESCRIBED HEREIN.

THE SECURITIES  DESCRIBED HEREIN ARE RESTRICTED WITH RESPECT TO  TRANSFERABILITY
AND RESALE.  THE  SECURITIES  MAY NOT BE RESOLD OR OTHERWISE  DISPOSED OF BY THE
SUBSCRIBER  UNLESS,  IN THE  OPINION OF  COUNSEL  SATISFACTORY  TO THE  COMPANY,
REGISTRATION  UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE STATE
SECURITIES  LAWS IS NOT REQUIRED OR  COMPLIANCE  IS MADE WITH SUCH  REGISTRATION
REQUIREMENTS.

THE  SUBSCRIBER,  BY HAVING  ACCEPTED  DELIVERY OF THE  INFORMATIONAL  MATERIALS
PROVIDED BY THE COMPANY AND ALL  ACCOMPANYING  OR RELATED  DOCUMENTS,  AGREES TO
RETURN SUCH MATERIALS TO THE COMPANY UPON REQUEST IF THE  SUBSCRIBER  DETERMINES
NOT TO MAKE AN INVESTMENT IN ANY OF THE SECURITIES DESCRIBED HEREIN.


                                       i

<PAGE>



THIS SUBSCRIPTION AGREEMENT DOES NOT CONSTITUTE AN OFFER OR
SOLICITATION BY ANYONE IN ANY JURISDICTION IN WHICH SUCH AN OFFER
OR SOLICITATION IS NOT AUTHORIZED.

                             FOR FLORIDA RESIDENTS:

THE  SECURITIES  OFFERED  HEREBY WILL BE SOLD,  AND  ACQUIRED,  IN A TRANSACTION
EXEMPT  UNDER  SECTION  517.061(11)  OF  THE  FLORIDA  SECURITIES  AND  INVESTOR
PROTECTION ACT. THE SECURITIES  HAVE NOT BEEN  REGISTERED  UNDER SAID ACT IN THE
STATE OF FLORIDA.  PURSUANT TO SECTION 517.061(11) OF THE FLORIDA SECURITIES AND
INVESTOR  PROTECTION  ACT,  WHEN  SALES  ARE  MADE TO FIVE  (5) OR MORE  PERSONS
(EXCLUDING  ACCREDITED INVESTORS) IN THE STATE OF FLORIDA, ANY SALE IN THE STATE
OF FLORIDA MADE PURSUANT TO SECTION  517.061(11)  OF SUCH ACT IS VOIDABLE BY THE
PURCHASER IN SUCH SALE (WITHOUT INCURRING ANY LIABILITY TO THE COMPANY OR TO ANY
OTHER PERSON OR ENTITY)  EITHER  WITHIN THREE (3) DAYS AFTER THE FIRST TENDER OF
CONSIDERATION  IS MADE BY SUCH PURCHASER TO THE ISSUER,  AN AGENT OF THE ISSUER,
OR AN ESCROW  AGENT OR  WITHIN  THREE (3) DAYS  AFTER THE  AVAILABILITY  OF THAT
PRIVILEGE IS COMMUNICATED TO SUCH PURCHASER, WHICHEVER OCCURS LATER. TO VOID HIS
PURCHASE,  THE  PURCHASER  NEED ONLY SEND A LETTER OR TELEGRAM TO THE COMPANY AT
THE ADDRESS  INDICATED  HEREIN.  ANY SUCH LETTER OR TELEGRAM  SHOULD BE SENT AND
POSTMARKED PRIOR TO THE END OF THE  AFOREMENTIONED  THREE (3) DAY PERIOD.  IT IS
PRUDENT TO SEND ANY SUCH LETTER BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED,  TO
ASSURE  THAT IT IS  RECEIVED  AND ALSO TO HAVE  EVIDENCE OF THE TIME THAT IT WAS
MAILED. SHOULD A PURCHASER MAKE THIS REQUEST ORALLY, THAT PURCHASER MUST ASK FOR
WRITTEN  CONFIRMATION  THAT THE  REQUEST  HAS BEEN  RECEIVED.  IF  NOTICE IS NOT
RECEIVED WITHIN THE TIME LIMIT SPECIFIED HEREIN, THE FOREGOING RIGHT TO VOID THE
PURCHASE SHALL BE NULL AND VOID.


                                       ii


<PAGE>




                             FOR MARYLAND RESIDENTS:

IN MAKING AN INVESTMENT DECISION INVESTORS MUST RELY ON THEIR OWN EXAMINATION OF
THE  ISSUER  AND THE  TERMS OF THE  OFFERING,  INCLUDING  THE  MERITS  AND RISKS
INVOLVED.  THESE  SECURITIES  HAVE NOT BEEN  RECOMMENDED BY ANY FEDERAL OR STATE
SECURITIES  COMMISSION  OR  REGULATORY  AUTHORITY.  FURTHERMORE,  THE  FOREGOING
AUTHORITIES  HAVE NOT CONFIRMED THE ACCURACY OR DETERMINED  THE ADEQUACY OF THIS
DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                             FOR VIRGINIA RESIDENTS:

THESE  SECURITIES HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED,  OR THE  VIRGINIA  SECURITIES  ACT,  BY REASON OF  SPECIFIC  EXEMPTIONS
THEREUNDER  RELATING  TO  THE  LIMITED  AVAILABILITY  OF  THE  OFFERING.   THESE
SECURITIES CANNOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF TO ANY PERSON OR
ENTITY  UNLESS  SUBSEQUENTLY  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933, AS
AMENDED,  OR THE SECURITIES ACT OF THIS STATE, IF SUCH REGISTRATION IS REQUIRED,
OR UNLESS AN EXEMPTION FROM SUCH REGISTRATION IS AVAILABLE.





                                      iii


<PAGE>



                                ESSEX CORPORATION

                     PROMISSORY NOTE SUBSCRIPTION AGREEMENT

         The  undersigned,  (the  "Subscriber")  hereby  subscribes to acquire a
Non-Negotiable  8%  Convertible  Promissory  Note (the  "Note")  issued by Essex
Corporation,  a Virginia corporation (the "Company"), in the principal amount of
Ten Thousand Dollars  ($10,000.00)  substantially in the form attached hereto as
Exhibit A. The unpaid  principal  amount of this Note and the interest  thereon,
shall be convertible at the option of the Subscriber  (the  "Conversion  Right")
prior to the  Maturity  Date,  in the  manner and on the terms  hereinafter  set
forth, into shares of common stock of the Company,  par value ($.10) at any time
prior to the Maturity Date at a conversion  price equal to the greater of market
value on the date that the election to convert is made or fifty cents ($.50) per
shares,  subject  to  adjustment  pursuant  to  Section 4 of the Note;  provided
however,  that in the event the assets of the  optoelectronics  division  of the
Company  have been  transferred  to  another  business  enterprise  in which the
Company  has a  controlling  shareholder  interest  ("Transferee"),  and  at the
election of the  Subscriber,  the unpaid  principal  amount of this Note and the
accrued interest thereon, shall be convertible into a percentage equity interest
of the Transferee determined pursuant to the following formula:

          x/y where x is the dollar  amount  converted  and y is the fair market
         value  (or  mean  fair  market  value,   if  more  than  one  valuation
         methodology  is  utilized)  as  determined  by a third party  expert in
         providing such valuations retained by the Company.

         The  Subscriber  represents  and  warrants  that  it  qualifies  as  an
"accredited  investor"  under Rule 501(a) of Regulation D promulgated  under the
Securities Act of 1933, as amended (the "Securities Act").

         The  Subscriber  hereby  agrees  to pay an  aggregate  of Ten  Thousand
Dollars ($10,000.00) as subscription for and in consideration of the issuance of
the Note being acquired pursuant hereto.

         The Subscriber hereby acknowledges that it has retained its own counsel
and/or other professional advisors to review and evaluate the economic,  tax and
other consequences of an investment in the Company, to the extent the Subscriber
has deemed necessary.

         The  Subscriber  acknowledges  that:  (i)  neither  the  Note  nor  the
securities issuable upon conversion thereof and default thereunder have been the
subject of registration under the Securities Act, the federal securities laws or
the laws of any state;  (ii) absent an exemption  from  registration  under such
laws,  the  issuance  and sale of the Note  (and the  securities  issuable  upon
conversion thereof and default thereunder) would require registration; (iii) the
Company and NEWCO-OPTO are and will be issuing such  securities in reliance upon
exemption from the  registration  requirements  of the Securities  Act; and (iv)
reliance by the Company and  NEWCO-OPTO  upon such  exemption  is based upon the
Subscriber's  representation,  warranties,  and  agreements  contained  in  this
Subscription Agreement.


                                       1


<PAGE>


     SECTION 1. The Subscriber represents,  warrants, acknowledges and agrees as
follows:

     A. Subject to applicable laws, rules and regulations, the Subscriber agrees
that the subscription  evidenced by this Subscription  Agreement is and shall be
irrevocable.

     B. The  Subscriber  has  received and  carefully  read the  following:  (i)
certain general business  information about the Company;  (ii) any and all other
information  deemed by the Subscriber to be necessary to verify the accuracy and
completeness of the  representations,  warranties and covenants made herein; and
(iii)  written or verbal  responses for all questions  that the  Subscriber  has
submitted to the Company  regarding an  investment in the  securities  described
herein,  all of which the  Subscriber  acknowledges  have been  provided  to the
Subscriber  (the "Corporate  Materials").  The Subscriber has not been furnished
with any other  materials  or  literature  relating to the offer and sale of the
securities described herein, other than the Corporate Materials.  The Subscriber
is fully aware of the financial condition of the Company, in particular the lack
of  working  capital  and other  financial  distress  being  experienced  by the
Company.  The Subscriber has been given the  opportunity to ask questions of and
to receive  answers from the Company  concerning the terms and conditions of the
offer and sale of the securities  described herein and the Corporate  Materials,
and to obtain  such  additional  written  information  necessary  to verify  the
accuracy of same as the Subscriber desires in order to evaluate an investment in
the securities  described herein. The Subscriber  acknowledges and confirms that
the written and/or verbal responses provided to the Subscriber by the Company in
response to the Subscriber's questions are not contrary to or inconsistent with,
nor do they in any way conflict with the  information set forth in the Corporate
Materials.  The Subscriber  further  acknowledges  that it fully understands the
information  contained in Corporate  Materials  and has had the  opportunity  to
discuss any  questions  regarding the  Corporate  Materials  with its counsel or
other advisor.  Notwithstanding  the foregoing,  the only information upon which
the Subscriber  has relied is that set forth in the Corporate  Materials and its
own independent  investigation.  The Subscriber acknowledges that the Subscriber
has received no  representations  or warranties from the Company,  or any of its
employees or agents in making an investment  decision related to the acquisition
of the  securities  described  herein,  other than as set forth  herein.

     C. The Subscriber is aware that the acquisition of the securities described
herein is a  speculative  investment  involving  a high  degree of risk and that
there is no  guarantee  that  the  Subscriber  will  realize  any  gain  from an
investment in such  securities.  The  Subscriber  further  understands  that the
Subscriber could lose the entire amount of the  Subscriber's  investment in such
securities.  The Subscriber  acknowledges  that the Subscriber has  specifically
reviewed  the  Corporate  Materials  with  a view  toward  subscribing  for  the
securities described herein.

     D. The  Subscriber  understands  that no federal  or state  agency or other
authority  (within  or outside of the  United  States)  has made any  finding or
determination  regarding the fairness of the offer,  sale and/or issuance of the
securities  described herein,  has made any recommendation or endorsement of the
offer and sale of the securities  described herein or has passed in any way upon
this Subscription Agreement or the other Corporate Materials.


                                       2

<PAGE>



     E. The Subscriber:  (i) is acquiring the securities described herein solely
for the  Subscriber's  own account for  investment  purposes only and not with a
view toward resale or distribution thereof, either in whole or in part; (ii) has
no  contract,  undertaking,  agreement  or other  arrangement,  in  existence or
contemplated,  to sell,  pledge,  assign or otherwise transfer the securities to
any other person or entity;  and (iii) agrees not to sell or otherwise  transfer
such  securities  unless and until they are  subsequently  registered  under the
Securities Act and any applicable  state securities laws, or unless an exemption
from any such requirement is available.

     F. The  Subscriber has read, is familiar with and  understands  Rule 501 of
Regulation D and represents  that the Subscriber is an "accredited  investor" as
defined in Rule 501(a) of Regulation D under the Securities Act.

     G. The  Subscriber  is  financially  able to bear the  economic  risk of an
investment in the  securities  described  herein,  including the ability to hold
such securities  indefinitely  and to afford a complete loss of the Subscriber's
investment in such securities.

     H. The Subscriber's overall commitment to investments which are not readily
marketable  is not  disproportionate  to the  Subscriber's  net  worth,  and the
Subscriber's  investment in the securities  described herein will not cause such
overall  commitment to become  excessive.  The Subscriber  understands  that the
statutory basis on which such  securities are being offered,  sold and/or issued
to the Subscriber would not be available if the Subscriber's  present  intention
were to hold such  securities for a fixed period of time or until the occurrence
of a certain event. The Subscriber  realizes that, in view of the Securities and
Exchange Commission (the "Commission"),  a purchase of such securities now, with
a present intention to resell by reason of a foreseeable specific contingency or
any  anticipated  change  in the  market  value  of such  securities,  or in the
condition  of the Company or that of the  industry in which the  business of the
Company  is  engaged  or in  connection  with  a  contemplated  liquidation,  or
settlement of any loan obtained by the  Subscriber  for the  acquisition of such
securities,  and for which such  securities  may be pledged as a security  or as
donations to religious or charitable  institutions for the purpose of securing a
deduction on an income tax return, would, in fact, constitute a purchase with an
intention inconsistent with the Subscriber's  representations to the Company and
the  Commission  would then  regard such  purchase  as a purchase  for which the
exemption from registration  under the Securities Act relied upon by the Company
in connection herewith is not available.

     I. The funds  provided for the  Subscriber's  investment in the  securities
described herein are either the separate  property of the Subscriber,  community
property over which the Subscriber has the right of control,  or are funds as to
which the Subscriber otherwise has the sole right of control, or are funds as to
which the Subscriber otherwise has the sole right of management.

     J.  The  Subscriber  was not  organized  or  reorganized  for the  specific
purposes of acquiring the securities  described  herein;  the Subscriber has the
full power and  authority  to execute this  Subscription  Agreement on behalf of
such entity and to make the  representations  and warranties  made herein on its
behalf; and an investment in the securities described herein has

                                       3

<PAGE>



been affirmatively authorized, if required, by the governing body of such entity
and is not prohibited by the governing documents of the entity.

     K. The following  address is the Subscriber's  principal  business address:
2385 N.W. 18th Place, Gainesville, Florida 32605.

     L. The  Subscriber  has such  knowledge  and  experience  in financial  and
business  matters  as to be  capable  of  evaluating  the merits and risks of an
investment in the securities described herein.

     M. The Note and the  certificates  evidencing  the  shares of Common  Stock
described herein will contain a legend substantially as follows:

THE  SECURITIES  WHICH  ARE  REPRESENTED  HEREBY  HAVE NOT BEEN THE  SUBJECT  OF
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  AND MAY NOT BE SOLD,
TRANSFERRED,  ASSIGNED,  PLEDGED,  HYPOTHECATED OR OTHERWISE DISPOSED OF UNTIL A
REGISTRATION  STATEMENT WITH RESPECT  THERETO IS DECLARED AND REMAINS  EFFECTIVE
UNDER SUCH ACT,  OR THE  COMPANY  RECEIVES AN OPINION OF COUNSEL FOR THE COMPANY
THAT AN EXEMPTION FROM REGISTRATION REQUIREMENTS OF SUCH ACT IS AVAILABLE.

     The Subscriber  further  acknowledges that: (i) any necessary stop transfer
orders will be placed upon the certificates for the securities  described herein
in accordance  with  Securities Act; and (ii) the Company is under no obligation
to  aid  the  Subscriber  in  obtaining  any  exemption  from  the  registration
requirements of the Securities Act or any jurisdiction.

     N. In no event will the  Subscriber  sell or otherwise  transfer any of the
securities  described herein other than in accordance with the terms thereof and
applicable law.
O. All information which the Subscriber has provided  concerning the Subscriber,
the Subscriber's  financial position and the Subscriber's knowledge of financial
and business matters is correct and complete as of the date hereof, and if there
should be any  change  in such  information,  the  Subscriber  will  immediately
provide such new information.

     P. In connection with the offer and sale of the securities described herein
to the  Subscriber,  the  Company is and will be relying  upon the  Subscriber's
representations and warranties as contained in this Subscription Agreement.

     Q. The Subscriber  acknowledges that the Subscriber understands the meaning
and legal consequences of the representations and warranties which are contained
herein and hereby  agrees to  indemnify,  save and hold the  Company and the its
officers, directors,  employees, agents and affiliates harmless from and against
any and all claims or actions  arising out of a breach by the  Subscriber of any
representation,  warranty,  acknowledgment,  term or condition contained in this
Subscription Agreement. Such indemnification shall be deemed to include not only
the specific  liabilities or obligations with respect to which such indemnity is
provided, but

                                       4

<PAGE>



also  all reasonable costs, expenses, counsel  fees  and expenses of settlement
relating  thereto,  whether or  not any  such  liability  or  obligation shall
have been reduced to judgment.  THE PARTIES  HERETO  HAVE  EACH  BEEN  ADVISED
THAT THE INDEMNIFICATION  DESCRIBED HEREIN MAY BE VOID AS AGAINST PUBLIC POLICY
AND UNENFORCEABLE IN SOME JURISDICTIONS.

     SECTION 2. The Company  represents,  warrants,  acknowledges  and agrees as
follows:

     A. The execution,  delivery and performance of this Subscription  Agreement
and  consummation  of  the  transactions  contemplated  hereby  have  been  duly
authorized,  adopted and  approved by its board of  directors.  It has taken all
necessary  corporate  action and has all the necessary  corporate power to enter
into this Subscription Agreement and to consummate the transactions contemplated
hereby.  This  Subscription  Agreement  has been duly and validly  executed  and
delivered by its officers on its behalf,  and  assuming  that this  Subscription
Agreement is the valid and binding  obligation of the  Subscriber,  is the valid
and binding  obligation  of the Company  enforceable  against each in accordance
with  its  terms,  except  as such  enforcement  may be  limited  by  applicable
bankruptcy, insolvency, reorganization,  moratorium or other similar laws now or
hereafter  in  effect,  or by  legal or  equitable  principles,  relating  to or
limiting  creditors'  rights  generally  and except  that the remedy of specific
performance  and injunctive  and other forms of equitable  relief are subject to
certain  equitable  defenses and to the discretion of the court before which any
proceeding therefor may be brought.

     B.  It is a  corporation  duly  organized,  validly  existing  and in  good
standing  under  the  laws  of the  jurisdiction  of its  formation.  It has the
corporate  power and authority to own and lease its properties and assets and to
carry on its business as it is now being conducted.

     C. There is no action, suit, proceeding or investigation pending against or
related to it, to the best of its knowledge, nor has it been threatened with any
such action, suit, proceeding or investigation, which would restrict its ability
to perform its  obligations  hereunder  or which  would have a material  adverse
effect on its business,  assets,  operations,  earnings,  prospects or condition
(financial or otherwise). To the best of its knowledge, there are no grounds for
or facts,  events or circumstances which would form the basis of any such action
that would cause or result in any such action, suit, proceeding or investigation
or which is  probable  of  assertion.  It is not in  default  in  respect of any
judgment,  order,  writ,  injunction  or decree  of any  court or any  national,
federal, provincial, state, local or other governmental agency, authority, body,
board,  bureau,  commission,  department or  instrumentality  which could have a
material adverse effect on its business, assets, operations, earnings, prospects
or condition (financial or otherwise).

     D. No statement by it as set forth herein and no statement set forth in any
certificate  or other  instrument or document  required to be delivered by or on
behalf  of it  pursuant  hereto  or  in  connection  with  consummation  of  the
transactions contemplated hereby, contained, contains or will contain any untrue
statement  of a  material  fact,  or  omitted,  omits or will  omit to state any
material  fact which is necessary  to make the  statements  contained  herein or
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.


                                       5

<PAGE>



     E.  The  execution,  delivery  and  performance  by  the  Company  of  this
Subscription  Agreement  and  the  Note  and  the  consummation  by  them of the
transactions contemplated hereby and thereby, including, without limitation, the
issuance,  sale and delivery of the Note,  do not require the  consent,  waiver,
approval, license or authorization of or filing of any notice or report with any
person,  entity or public authority and will not violate,  result in a breach of
or the acceleration of any obligation  under, or constitute a default under, any
provision  of  their  respective   organizational   documents  or  any  material
indenture,  mortgage,  lien,  lease,  agreement,  contract,  instrument,  order,
judgment,  decree,  law,  ordinance or  regulation  to which any property of the
Company  is  subject  or by which  either  such  party is bound or result in the
creation  or  imposition  of any lien,  claim,  charge,  restriction,  equity or
encumbrance  of any  kind  whatsoever  upon,  or give to any  other  person  any
interest  or  right  in or  with  respect  to,  any of the  properties,  assets,
business, agreements or contracts of the Company.

     SECTION 3. Except as  otherwise  specifically  provided for  hereunder,  no
party  shall be deemed to have  waived any of his,  her or its rights  hereunder
unless  such waiver is in writing  and signed by the party  waiving  said right.
Except as otherwise specifically provided for hereunder, no delay or omission by
any party in  exercising  any right with  respect to the subject  matter  hereof
shall operate as a waiver of such right or of any such other right.  A waiver on
any one  occasion  with  respect  to the  subject  matter  hereof  shall  not be
construed  as a bar to or waiver of any right or remedy on any future  occasion.
All rights and remedies with respect to the subject  matter hereof be cumulative
and may be exercised separately or concurrently.

     SECTION  4. None of the  parties  hereto  has made any  representations  or
warranties  with respect to the subject matter hereof not set forth herein or in
the  Note.  This  Subscription  Agreement  and the Note  constitute  the  entire
agreement  between the parties hereto with respect to the subject matter hereof.
All understandings and agreements which heretofore may have existed or did exist
between  the  parties  hereto  with  respect to the  subject  matter  hereof are
superseded by this Subscription Agreement and the Note.
     SECTION  5.  This  Subscription  Agreement  may not be  changed,  modified,
extended or  terminated  other than by an  agreement  in writing,  signed by the
parties hereto.

     SECTION  6. The  parties  hereto  agree to  execute  any and all such other
documents and to take any and all such further  actions  reasonably  required to
effectuate the agreement evidenced by this Subscription Agreement and the intent
and purposes hereof.

     SECTION 7. This  Subscription  Agreement shall be governed by and construed
in  accordance  with the laws of the  State of  Maryland  without  regard to the
principles of conflicts of laws thereof.  The Subscriber  hereby consents to the
jurisdiction  of the state courts of and federal  courts located in the State of
Maryland.

     SECTION 8. This Subscription  Agreement,  including the representations and
warranties  contained  herein,  shall be binding  upon the  Subscriber's  heirs,
executors,  administrators,  representatives,  successors  and  assigns  (to the
extent assignment may be permitted hereunder).

                                    * * * * *


                                       6

<PAGE>










         IN WITNESS  WHEREOF,  the  Subscriber  has executed  this  Subscription
Agreement this 24th day of June, 1997.


                                    NAME OF SUBSCRIBER

                                    Harold P. Hanson Trust
                                    ----------------------




         In   consideration   of  and  in  reliance  upon  the  foregoing,   the
subscription  and purchase  described herein is hereby accepted this 24th day of
June, 1997 by the undersigned.


                                    ESSEX CORPORATION


                                    By:      Harry Letaw, Jr.
                                    -------------------------
                                    Harry Letaw, Jr., Chief Executive Officer


                                       7






                                  EXHIBIT 10.19

         8% Convertible Note Payable - Harry Letaw, Jr. and Joyce Letaw




<PAGE>



NEITHER THIS NOTE NOR THE SECURITIES  ISSUABLE UPON CONVERSION  HEREOF HAVE BEEN
THE SUBJECT OF  REGISTRATION  UNDER THE SECURITIES  ACT OF 1933, AS AMENDED,  OR
UNDER THE SECURITIES  LAWS OF ANY STATE AND THE SAME HAVE BEEN (OR WILL BE, WITH
RESPECT TO THE SECURITIES ISSUABLE UPON CONVERSION HEREOF) ISSUED IN RELIANCE ON
EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SAID ACT AND SUCH LAWS. NEITHER
THIS  NOTE NOR THE  SECURITIES  ISSUABLE  UPON  CONVERSION  HEREOF  MAY BE SOLD,
TRANSFERRED,  PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF EXCEPT AS PERMITTED
UNDER SUCH SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.


                  NON-NEGOTIABLE 8% CONVERTIBLE PROMISSORY NOTE

$ 200,000                                                  Columbia, Maryland
June 24, 1997

         FOR VALUE RECEIVED,  the  undersigned,  Essex  Corporation,  a Virginia
corporation  (hereinafter  referred to as the "Maker" or the  "Company")  hereby
promises to pay Harry Letaw,  Jr. and Joyce W. Letaw,  Ten Ent. (the "Payee") at
440 Severnside Drive, S.W., Severna Park, MD 21146 or at such other place as the
holder hereof may from time to time  designate in writing,  the principal sum of
Two Hundred  Thousand and 00/100 Dollars  ($200,000) in one installment due upon
the earlier  of: (i) one (1) year from the date of  issuance  of the  promissory
note;  or (ii) ten (10) business  days after the date of  consummation  of stock
acquisition/sale of substantially all of the assets or the merger of the Company
by or with an unrelated entity or business enterprise (the "Acquisition"), which
transaction  requires shareholder  approval.  Interest shall be paid by Maker to
the Payee on the  Maturity  Date at the simple  rate of eight (8%)  percent  per
annum  computed  on  the  unpaid  principal  balance.   By  acceptance  of  this
Non-Negotiable   8%  Convertible   Promissory  Note  (the  "Note"),   the  Payee
represents,  warrants, covenants and agrees that he, she or it will abide by and
be bound by its terms.

1. Prepayment,  Extension and Notices.  The unpaid principal balance outstanding
under this Note may be prepaid in part or in full by the Maker without  penalty,
upon  fifteen  (15) days notice to the Payee  stating the  repayment  amount and
repayment  date (the  "Repayment  Date").  The Maker must provide  notice of its
intention  to prepay  amounts  outstanding  hereunder at least five (5) business
days prior to the Maturity Date to the Payee.

2.  Conversion.  The  unpaid  principal  amount  of this  Note and the  interest
thereon,  shall be  convertible  at the  option  of the Payee  (the  "Conversion
Right") prior to the Maturity  Date, in the manner and on the terms  hereinafter
set forth,  into shares of common stock of the Company,  par value ($.10) at any
time prior to the Maturity  Date at a  conversion  price equal to the greater of
market  value on the date that the  election  to convert is made or fifty  cents
($.50) per shares, subject to adjustment pursuant to Section 4 hereof;  provided
however,  that in the event the assets of the  optoelectronics  division  of the
Company have been transferred to another business

                                       1

<PAGE>



enterprise  [in  which  the  Company  has a  controlling  shareholder  interest]
("Transferee"), and at the election of the Payee, the unpaid principal amount of
this  Note  and the  accrued  interest  thereon,  shall  be  convertible  into a
percentage  equity  interest  of  the  Transferee  determined  pursuant  to  the
following formula:

                   x/y where x is the dollar amount  converted and y is the fair
                  market  value (or mean  fair  market  value,  if more than one
                  valuation  methodology  is utilized) as  determined by a third
                  party  expert in  providing  such  valuations  retained by the
                  Company..

         (b) Notice of the right to convert  shall be given  promptly  after the
date of Acquisition  and Maker shall have the period of time between such Notice
date and the Maturity  Date (but in no event less than ten (10)  business  days)
during which Payee shall have the  opportunity to elect to convert the principal
and interest into Newco Common Stock, or receive cash payment.

         (c)  Notwithstanding  any other provision of this Note to the contrary,
upon  receipt  of notice  of the  Maker's  intent  to prepay  part or all of the
principal  amount  hereunder or of an  Accelerated  Maturity Date, the Payee may
elect to exercise  the  Conversion  Right and convert a portion (as set forth in
subsection (a) hereof) of the amount of unpaid principal which the Maker intends
to  prepay,  up to the close of  business  on the last  business  day before the
stated Repayment Date.

         (d)  Notwithstanding  any other provision hereof,  the Conversion Right
may not be exercised at any time during which a registration statement under the
Securities Act of 1933 is filed but not effective  absent written consent of the
Company.

3. Conversion  Procedure.  The Conversion Right may be exercised by the Payee by
the surrender of this Note (along with the conversion form attached hereto, duly
executed) to the Maker at the principal office of the Maker.  Risk of loss prior
to  surrender  of this  Note  shall be borne by the  Payee.  Consequently,  hand
delivery with written  acknowledgement  of receipt by the Maker or registered or
certified  mail,  return receipt  requested,  is the preferred mode of delivery.
Conversion  shall be deemed to have been effected on the date when such delivery
of the conversion  notice is actually made or, if earlier,  at the expiration of
five (5) calendar  days after being sent to the Maker by the Payee by registered
or certified mail, return receipt requested,  with postage thereon fully prepaid
(the "Conversion Date"). As promptly as practicable thereafter,  the Maker shall
issue and  deliver  to the Payee:  (a) a new note  representing  the  difference
between the  principal  amount of this Note plus  interest  accrued  through the
Conversion  Date,  and the  principal  amount  hereof  which has been  converted
pursuant  hereto;  and (b)  certificates  representing  the  number of shares of
Common Stock to which the Payee is entitled. The Maker shall not be obligated to
issue certificates  representing shares of Common Stock in the name of any party
other  than the  Payee.  The  person or entity  in whose  name the  certificates
representing the shares of Common Stock issuable upon conversion hereof shall be
deemed to have become a holder of record on the next succeeding day on which the
transfer books are open, but the Conversion Price shall be that in effect on the
Conversion  Date. The Maker  covenants  that all securities  which may be issued
upon exercise

                                       2


<PAGE>



of the Conversion Right will, upon issuance, be fully paid and nonassessable and
free of all taxes, liens and charges caused or created by the Maker with respect
to the issuance thereof.

4. Adjustments. The Conversion Price and the number and kind of securities which
may be received  upon the exercise of the  Conversion  Right shall be subject to
adjustment from time to time upon the happening of certain events, as follows:
  
         (a) Stock  Splits and  Combinations.  If the Maker shall at any time or
from time to time after the date hereof effect a subdivision of its  outstanding
shares of Common Stock, the Conversion Price then in effect  immediately  before
such subdivision  shall be  proportionately  decreased,  and conversely,  if the
Maker shall at any time or from time to time after the date  hereof  combine its
outstanding  shares  of  Common  Stock,  the  Conversion  Price  then in  effect
immediately  before such combination  shall be  proportionately  increased.  Any
adjustment  under this section shall become effective upon the close of business
on the date the subdivision or combination becomes effective.

         (b) Certain  Dividends and  Distributions.  In the event that the Maker
shall at any time or from time to time after the date hereof  make or issue,  or
fix a record  date for the  determination  of holders of shares of Common  Stock
entitled to  receive,  a dividend or other  distribution  payable in  additional
shares of Common Stock,  then and in each such event,  the Conversion Price then
in effect shall be  decreased  as of the time of such  issuance or, in the event
that such a record  date shall have been  fixed,  as of the close of business on
such  record  date,  by  multiplying  the  Conversion  Price then in effect by a
fraction:

                  (1) the numerator of which shall be the total number of shares
of Common Stock  issued and  outstanding  immediately  prior to the time of such
issuance or the close of business on such record date; and

                  (2) the  denominator  of which  shall be the sum of the  total
number of shares of Common Stock issued and outstanding immediately prior to the
time of such  issuance  or the close of  business  on such  record  date and the
number of shares of  Common  Stock  issuable  in  payment  of such  dividend  or
distribution;  provided, however, that if such record date shall have been fixed
and such dividend is not fully paid or if such distribution is not fully made on
the date fixed therefor, the Conversion Price shall be recomputed accordingly as
of the close of  business on such record  date and  thereafter  such  Conversion
Price shall be adjusted  pursuant  to this  subsection  as of the time of actual
payment of such dividends or distributions.

         (c) Other Dividends and  Distributions.  In the event that the Maker at
any time or from time to time after the date hereof shall make or issue,  or fix
a record  date for the  determination  of  holders  of shares  of  Common  Stock
entitled to receive, a dividend or other  distribution  payable in securities of
the  Maker  other  than  shares  of Common  Stock,  then and in each such  event
provisions  shall be made so that the  holder of this Note shall  receive,  upon
conversion  of this Note,  in addition  to the number of shares of Common  Stock
receivable  thereupon,  the amount of  securities of the Maker which such holder
would have received had its Note been  converted  into shares of Common Stock on
the date of such event and had  thereafter,  during the period  from the date of
such event to and including the Conversion Date,


                                       3

<PAGE>



retained such securities (together with any distributions payable thereon during
such period)  receivable by the holder as aforesaid  during such period,  giving
application to all adjustments  called for during such period under this section
with respect to the rights of the holder of the Note.

         (d) Reclassification, Exchange or Substitution. If the shares of Common
Stock  issuable upon the  conversion of this Note shall be changed into the same
or different number of shares of any class or classes of capital stock,  whether
by  capital   reorganization,   reclassification  or  otherwise  (other  than  a
subdivision or combination of shares or stock dividend  provided for above, or a
reorganization,  merger,  consolidation  or  sale  of  assets  provided  for  in
subsection  (e)  below),  then and in each such  event,  the holder of this Note
shall have the right thereafter to convert this Note into the kind and amount of
shares of capital stock and other  securities and property  receivable upon such
reorganization, reclassification or other change, as the holder of the number of
shares  of  Common  Stock  into  which  this  Note  might  have  been  converted
immediately  prior  to such  reorganization,  reclassification  or  change,  all
subject to further adjustment as provided herein.

         (e) Reorganization, Merger, Consolidation or Sale of Assets. If, at any
time or from time to time, there shall be a capital reorganization of the shares
of Common  Stock (other than a  subdivision,  combination,  reclassification  or
exchange  of shares  provided  for  elsewhere  in this  section)  or a merger or
consolidation of the Maker with or into another corporation,  or the sale of all
or substantially all of the Maker's properties and assets to any other person or
entity, then as a part of such  reorganization,  merger,  consolidation or sale,
provision  shall be made so that the  holder of this Note  shall  thereafter  be
entitled  to  receive  upon  conversion  of this  Note,  the number of shares of
capital stock or other  securities or property of the Maker, or of the successor
corporation  resulting from such merger or  consolidation  or sale, to which the
holder of shares of Common Stock  deliverable  upon  conversion  would have been
entitled on such  reorganization,  merger,  consolidation,  or sale. In any such
case,  appropriate adjustment shall be made in the application of the provisions
of this  section with respect to the rights of the holder of this Note after the
reorganization,  merger, consolidation or sale to the end that the provisions of
this section  (including  adjustment of the Conversion  Price then in effect and
the number of shares of Common Stock  receivable  upon  conversion of this Note)
shall be  applicable  after  that  event as nearly  equivalent  hereto as may be
practicable.

         (f) Material  Financing.  If the Corporation at an time during a twelve
(12) month period  commencing on the date of issuance of the Note, enters into a
transaction with a third party which is intended to provide  material  financing
to the Corporation,  and such transaction  includes rights of conversion similar
to those  granted in this Note,  then the  Conversion  Price  shall be  adjusted
downward to be equal to the Conversion Price granted to such third party.

         (g) Minimum  Adjustment.  Notwithstanding  anything to the contrary set
forth herein,  no adjustment of the Conversion  Price shall be made in an amount
equal to less than one cent  ($.01),  but any such  lesser  adjustment  shall be
carried  forward  and  shall  be made at the  time  and  together  with the next
subsequent  adjustment  which together with any  adjustments so carried  forward
shall amount to one cent ($.01) or more.



                                       4

<PAGE>



         (h)  Certificate of Adjustment.  Upon the occurrence of each adjustment
or readjustment of the applicable Conversion Price pursuant to this section, the
Maker shall promptly  compute such adjustment or readjustment in accordance with
the  terms  hereof  and  prepare  and  furnish  to the  holder  of  this  Note a
certificate,  signed by the  Chairman of the Board,  the  President or the Chief
Financial Officer,  setting forth such adjustment or readjustment and showing in
detail the facts upon which such adjustment or readjustment is based.

         (i)      Notices of Record Date.  If and in the event that:

                  (1) the  Maker  shall  set a record  date for the  purpose  of
entitling  the holders of shares of Common  Stock to receive a dividend,  or any
other distribution, payable otherwise than in cash;

                  (2) the  Maker  shall  set a record  date for the  purpose  of
entitling the holders of shares of Common Stock to subscribe for or purchase any
shares of any class or to receive any other rights;

                  (3) there shall occur any capital reorganization of the Maker,
reclassification  of the  shares of  capital  stock of the Maker  (other  than a
subdivision  or  combination  of  its  outstanding   shares  of  Common  Stock),
consolidation or merger of the Maker with or into another  corporation,  or sale
of all or substantially all of the assets of the Maker; or

                  (4) there shall occur a voluntary or involuntary dissolution,
liquidation, or winding up of the Maker;

then,  and in any such case, the Maker shall cause to be mailed to the holder of
record of this Note, at least [thirty (30) days] prior to the dates  hereinafter
specified,  a notice stating the date: (A) which has been set as the record date
for the purpose of such dividend,  distribution, or rights; or (B) on which such
reclassification,  reorganization,  consolidation,  merger,  sale,  dissolution,
liquidation  or winding up is to take place and the record  date as of which the
holder of record shall be entitled to exchange this Note for securities or other
property deliverable upon such reclassification,  reorganization, consolidation,
merger, sale, dissolution, liquidation or winding up.

5.  Reservation.  The Maker covenants  that,  during the period within which the
Conversion  Right may be exercised,  the Maker will at all times have authorized
and reserved for the purpose of issuance upon exercise of the Conversion  Right,
a sufficient  number of shares of Common Stock (or other  securities  subject to
the  Conversion  Right) to provide for the exercise of the  Conversion  Right in
full.

6. Fractional  Shares. No fractional shares of Common Stock shall be issued upon
conversion  of this Note.  In lieu of any  fractional  shares of Common Stock to
which the Payee would otherwise be entitled, the Maker shall pay an amount equal
to the  product of such  fraction  multiplied  by the fair value of one share of
Common Stock on the Conversion Date, as determined in good faith by the Board of
Directors of the Maker.


                                       5


<PAGE>



7.       Registration Rights.  The Maker hereby covenants and agrees as follows:

         (a)      Definitions.  For purposes of this section:

                  (1) The  terms  "register,"  "registered"  and  "registration"
         refer to a registration effected by preparing and filing a registration
         statement or similar  document in compliance with the Securities Act of
         1933,  as  amended  (the  "Securities  Act"),  and the  declaration  of
         effectiveness of such  registration  statement or other document by the
         Securities and Exchange Commission (the "SEC").

                  (2) The term "Registrable Securities" means: (A) the shares of
         Common Stock issued or issuable  upon  conversion  of this Note; or (B)
         any other  securities  of the Maker  issued  as (or  issuable  upon the
         conversion or exercise of any warrant, right or other security which is
         issued  as) a  dividend  or other  distribution  with  respect  to,  in
         exchange for or in replacement of the shares of Common Stock referenced
         in subsection (A) immediately above,  excluding in all cases,  however,
         any   Registrable   Securities   sold  to  the  public  pursuant  to  a
         registration or an exemption from registration.

                  (3) The  number  of  shares of  "Registrable  Securities  then
         outstanding"  shall be the number of securities  outstanding  which are
         Registrable Securities.

                  (4) The term  "Holder" as used  hereinafter  in this Section 7
         means any person or entity owning of record Registrable Securities.

         (b) Piggy-Back  Registration Rights. In the event that (but without any
obligation to do so) the Maker proposes to register any of its securities  under
the Securities  Act in connection  with the public  offering of such  securities
solely for cash (other  than a  registration  on Form S-4,  Form S-8 or any form
which does not include  substantially  the same information as would be required
to be included in a registration  statement covering the sale of the Registrable
Securities),  the Maker shall  promptly give each Holder  written notice of such
registration (the "Piggy-Back Notice");  provided, however, that the Maker shall
have no  obligation  to so  notify  Holders  with  respect  to any  registration
subsequent  to the first of such  registrations  to occur after the  issuance of
this  Note and shall  have no  obligation  if such  registration  relates  to an
underwritten  offering by the Maker and the managing  underwriter of the subject
proposed offering expresses its objection thereto to the Maker. Upon the written
request of each  Holder  given  within  twenty  (20) days after  receipt of such
Piggy-Back Notice from the Maker, the Maker shall,  subject to the provisions of
Subsections  7(h)  and 7(m)  below,  cause to be  included  in the  registration
statement  filed by the Maker under the  Securities  Act all of the  Registrable
Securities  that each such  Holder has  requested  to be  registered;  provided,
however,  that the Maker  shall  have no such  obligation  if such  registration
statement  relates to an  underwritten  offering  by the Maker and the  managing
underwriter  of the subject  offering has expressed its objection to the same to
the Maker. To the extent that a Holder is offered the  opportunity  hereunder to
include all of its  Registrable  Securities in a  registration  statement,  such
Holder will be deemed to have exercised its sole piggy-back  registration  right
provided by this Subsection 7(c).


                                       6


<PAGE>



         (c) Obligations of the Maker.  Whenever the Maker shall elect to file a
registration statement to effect the registration of any Registrable Securities,
the Maker shall, as expeditiously as reasonably possible:

                  (1)  Prepare  and file with the SEC a  registration  statement
with respect to such  Registrable  Securities  and use its best efforts to cause
such registration  statement to become  effective,  and, upon the request of the
Holders of at least fifty percent (50%) of the Registrable Securities registered
thereunder,  keep such  registration  statement  effective for at least four (4)
months.

                  (2)  Prepare  and  file  with  the  SEC  such  amendments  and
supplements to such registration  statement and the prospectus  included therein
as may be necessary to comply with the  provisions  of the  Securities  Act with
respect  to the  disposition  of all  securities  covered  by such  registration
statement.

                  (3)  Furnish  to the  Holders  such  numbers  of  copies  of a
prospectus,   including  a  preliminary  prospectus,   in  conformity  with  the
requirements  of the  Securities  Act,  and  such  other  documents  as they may
reasonably  request  in order  to  facilitate  the  disposition  of  Registrable
Securities owned by them.

                  (4)  Use  its  best   efforts  to  register  and  qualify  the
securities  covered by such registration  statement under the securities laws of
such  jurisdictions  as shall be  reasonably  requested  by the  Holders for the
distribution of the securities covered by the registration  statement,  provided
that the Maker shall not be required in  connection  therewith or as a condition
thereto  to qualify to do  business  or to file a general  consent to service of
process in any such jurisdiction.

                  (5) In the event of any underwritten  public  offering,  enter
into and perform its  obligations  under an  underwriting  agreement  with terms
generally satisfactory to the managing underwriter of such offering.

                  (6) Notify the  Holders  promptly  after the Maker  shall have
received notice thereof,  of the time when the  registration  statement  becomes
effective or any supplement to any prospectus forming a part of the registration
statement has been filed.

                  (7)  Notify  the  Holders  of any stop  order  suspending  the
effectiveness of the registration  statement and use its reasonable best efforts
to remove such stop order.

         (d)  Furnish  Information.  It shall be a  condition  precedent  to the
obligations  of the Maker to take any  action  pursuant  hereto  that any Holder
seeking to include any of its Registrable Securities in a registration statement
filed by the Maker pursuant  hereto shall furnish to the Maker such  information
regarding itself, the Registrable Securities held by it, and the intended method
of  disposition  of  such   securities  as  shall  be  required  to  effect  the
registration of its Registrable Securities. In that connection, each such Holder
shall be required to represent to the Maker that all such  information  which is
given is both  complete  and  accurate in all  material  respects.  Each of such
Holders shall deliver to the Maker a statement in writing from


                                       7

<PAGE>



the beneficial  owners of such securities that such beneficial  owners bona fide
intend to sell, transfer or otherwise dispose of such securities.

         (e) Definition of Expenses.

                  (1)  "Registration  Expenses" shall mean all expenses incurred
by the Maker in complying with Sections 7(c) and 7(d) hereof,  including without
limitation,  all  registration  and filing  fees,  printing  expenses,  fees and
disbursements  of counsel  for the Maker,  blue sky fees and  expenses,  and the
expense of any special audits  incident to or required by any such  registration
(but excluding the compensation of regular employees of the Maker which shall be
paid in any event by the Maker).

                  (2) "Selling Expenses" shall mean all underwriting  discounts,
selling commissions and underwriters'  expense allowance  applicable to the sale
and all fees and  disbursements  of any special  counsel (other than the Maker's
regular counsel) for any Holder.

         (f) Expenses of  Registration.  All Registration  Expenses  incurred in
connection with any registration, qualification or compliance herewith, shall be
borne by the Maker,  and all Selling  Expenses  shall be borne by the Holders of
the  securities so registered pro rata on the basis of the number of Registrable
Securities so registered.

         (g)  Underwriting  Requirements.  All Holders  proposing to  distribute
their  securities  through an underwriting  pursuant hereto shall (together with
the Maker and any other  holders  distributing  their  securities  through  such
underwriting)  enter into an  underwriting  agreement in customary form with the
underwriter   or   underwriters   selected  for   underwriting   by  the  Maker.
Notwithstanding  any other  provision  of this  section,  at the  request of the
managing underwriter,  the Holder shall delay the sale of Registrable Securities
which such Holder has requested be registered  under this section for the ninety
(90)  day  period  commencing  with  the  effective  date  of  the  registration
statement.  Notwithstanding anything to the contrary herein, no such delay shall
be required with respect to securities offered by holders of securities who have
requested  the  Maker  to  register  such  securities  pursuant  to a  mandatory
registration  obligation of the Maker if other security holders of the Maker who
have not made  requests  pursuant  to such an  obligation  are not  subject to a
similar delay. If any Holder  disapproves of the terms of any such underwriting,
he may  elect to  withdraw  therefrom  by  written  notice  to the Maker and the
underwriter.   Any  Registrable  Securities  excluded  or  withdrawn  from  such
underwriting  shall  not be  withdrawn  from  such  registration  except  at the
election of the Holder.

         (h) Delay of Registration.  No Holder shall have any right to obtain or
seek an injunction  restraining or otherwise  delaying any such  registration as
the  result  of  any   controversy   that  might  arise  with   respect  to  the
interpretation or implementation of this section.

         (i) Indemnification.  In the event that any Registrable Securities are
 included in a registration statement pursuant hereto:

                  (1) To the extent  permitted by law, the Maker will  indemnify
         and hold harmless each Holder, the officers,  directors and partners of
         each Holder, any


                                       8

<PAGE>



         underwriter (as defined in the Securities Act) for such Holder and each
         person or entity,  if any,  that  controls  such Holder or  underwriter
         within the meaning of the Securities Act or the Securities Exchange Act
         of 1934, as amended (the "Exchange Act"),  against any losses,  claims,
         damages  or  liabilities  (joint or  several)  to which they may become
         subject under the Securities  Act, the Exchange Act or other federal or
         state law, insofar as such losses,  claims,  damages or liabilities (or
         actions in respect  thereof)  arise out of or are based upon any of the
         following   statements,   omissions  or  violations   (collectively   a
         "Violation"): (A) any untrue statement or alleged untrue statement of a
         material fact contained in such registration  statement,  including any
         preliminary  prospectus or final  prospectus  contained  therein or any
         amendments or supplements thereto; (B) the omission or alleged omission
         to state  therein a material  fact  required to be stated  therein,  or
         necessary to make the  statements  therein not  misleading;  or (C) any
         violation or alleged  violation by the Maker of the Securities Act, the
         Exchange  Act,  any  state  securities  law or any  rule or  regulation
         promulgated  under the  Securities  Act,  the Exchange Act or any state
         securities law; and the Maker will reimburse each such Holder, officer,
         director or partner, underwriter or controlling person for any legal or
         other  expenses   reasonably   incurred  by  them  in  connection  with
         investigating or defending any such loss, claim,  damage,  liability or
         action;  provided,  however,  that the indemnity agreement contained in
         this  subsection  shall not apply to amounts paid in  settlement of any
         such loss,  claim,  damage,  liability or action if such  settlement is
         effected  without the consent of the Maker (which  consent shall not be
         unreasonably withheld),  nor shall the Maker be liable in any such case
         for any such loss,  claim,  damage,  liability  or action to the extent
         that it arises  out of or is based  upon a  Violation  which  occurs in
         reliance  upon and in  conformity  with written  information  furnished
         expressly  for use in  connection  with such  registration  by any such
         Holder,  underwriter  or  controlling  person;  and  further  provided,
         however,  that the  foregoing  indemnity  agreement  is  subject to the
         condition that, insofar as it relates to any untrue statement,  alleged
         untrue statement,  omission or alleged omission made in any preliminary
         prospectus  but  eliminated or remedied in the  definitive  prospectus,
         such  indemnity  agreement  shall  not  inure  to  the  benefit  of the
         underwriter  (or the benefit of any person or entity that controls such
         underwriter),  if a copy of the  definitive  prospectus was not sent or
         given to such person or entity with or prior to the confirmation of the
         sale of such securities to such person or entity.

                  (2) To the extent  permitted by law, each selling  Holder will
         indemnify and hold harmless the Maker,  each of its directors,  each of
         its officers who have signed the registration  statement,  each person,
         if any, who controls the Maker within the meaning of the Securities Act
         or the  Exchange  Act,  any  underwriter  (within  the  meaning  of the
         Securities Act) for the Maker, any person who (or entity that) controls
         such  underwriter,  and any other  Holder  selling  securities  in such
         registration  statement  or any of its  directors  or  officers  or any
         person who controls such Holder, against any losses, claims, damages or
         liabilities (joint or several) to which the Maker or any such director,
         officer,  controlling person (or entity), or underwriter or controlling
         person, or other such Holder or director, officer or controlling person
         may become subject, under the Securities Act, the Exchange Act or other
         federal  or state  law,  insofar  as such  losses,  claims,  damages or
         liabilities  (or actions in respect  thereto) arise out of or are based
         upon any Violation, in each case to the extent (and only to the extent)
         that such Violation occurs in reliance


                                       9

<PAGE>



         upon and in  conformity  with  written  information  furnished  by such
         Holder expressly for use in connection with such registration; and each
         such  Holder  will  reimburse  any legal or other  expenses  reasonably
         incurred by the Maker or any such director, officer, controlling person
         (or entity),  underwriter  or  controlling  person (or  entity),  other
         Holder,  officer,  director or  controlling  person in connection  with
         investigating or defending any such loss, claim,  damage,  liability or
         action;  provided,  however,  that the indemnity agreement contained in
         this  subsection  shall not apply to amounts paid in  settlement of any
         such loss,  claim,  damage,  liability or action if such  settlement is
         effected without the consent of the Holder,  which consent shall not be
         unreasonably withheld.

                  (3) Promptly after receipt by an indemnified  party under this
         Section 7(i) of notice of the commencement of any action (including any
         governmental  action),  such  indemnified  party  will,  if a claim  in
         respect thereof is to be made against any indemnifying party under this
         Section  7(i),  notify  the  indemnifying   party  in  writing  of  the
         commencement thereof and the indemnifying party shall have the right to
         participate in, and, to the extent the  indemnifying  party so desires,
         jointly with any other indemnifying party similarly notified, to assume
         the defense thereof with counsel mutually  satisfactory to the parties;
         provided,  however,  that an indemnified  party shall have the right to
         retain its own  counsel,  with the fees and  expenses to be paid by the
         indemnifying  party, if representation of such indemnified party by the
         counsel retained by the indemnifying  party would be inappropriate  due
         to actual or potential  differing  interests  between such  indemnified
         party  and  any  other  party  represented  by  such  counsel  in  such
         proceeding.  The  failure  to notify  an  indemnifying  party  within a
         reasonable time of the  commencement of any such action,  to the extent
         prejudicial  to its ability to defend such action,  shall  relieve such
         indemnifying party of any liability to the indemnified party under this
         Section 7(i), but the omission so to notify the indemnifying party will
         not  relieve it of any  liability  that it may have to any  indemnified
         party otherwise than under this Section 7(i).

         (j) Reports Under  Securities  Exchange Act of 1934. With a view toward
making  available  to Holders  the  benefits of Rule 144  promulgated  under the
Securities  Act and any other rule or regulation of the SEC that may at any time
permit  a  Holder  to  sell  securities  of  the  Maker  to the  public  without
registration, the Maker agrees to:

                  (1) use its best efforts to make and keep public information 
         available, as those terms are understood and defined in Rule 144, at
         all times;

                  (2) use its  best  efforts  to file  with  the SEC in a timely
         manner all reports and other documents  required of the Maker under the
         Securities Act and the Exchange Act; and

                  (3)  furnish to any  Holder,  so long as the  Holder  owns any
         Registrable Securities,  forthwith upon request such information as may
         be  reasonably  requested in order to allow any Holder to avail himself
         of any rule or  regulation  of the SEC which permits the selling of any
         such securities without registration.


                                       10


<PAGE>



         (k)  Termination of the Maker's Obligations.

                  (1) The Maker shall have no  obligation  pursuant to Section 7
with respect to any request made by any Holder  after the first  anniversary  of
the Maturity Date.

                  (2) Notwithstanding any provision hereof to the contrary,  the
Maker shall not be required to effect any registration  under the Securities Act
or under any state securities laws on behalf of any Holder or Holders if, in the
opinion of counsel  for the Maker,  the  offering  or transfer by such Holder or
Holders in the manner proposed  (including,  without  limitation,  the number of
shares  proposed  to be offered or  transferred  and the method of  offering  or
transfer) is exempt from the registration requirements of the Securities Act and
the securities laws of applicable states.

         (l) Lock Ups;  Limitation  on  Rights.  The Payee  (and any  subsequent
Holder) by acceptance hereof hereby agrees that, in the event that subsequent to
the date  hereof,  the Maker  conducts an  underwritten  public  offering of its
securities:  (i) the right to request  registration  pursuant to the  provisions
hereof  shall be subject  to the  approval  of the  underwriter  of such  public
offering;  and (ii) the Payee (and any subsequent Holder) shall agree to refrain
from exercising such rights or selling,  transferring or otherwise  disposing of
any of the  Registrable  Securities for a period of up to thirteen months should
the underwriter so request in writing.

8.       Miscellaneous.

         (a) Restricted Securities.  By acceptance hereof, the Payee understands
and  agrees  that  this  Note and the  shares  of  Common  Stock  issuable  upon
conversion hereof are "restricted  securities" under the federal securities laws
inasmuch  as they are  being  acquired  from  the  Maker  in a  transaction  not
involving a public offering and have not been the subject of registration  under
the  Securities  Act and that under such laws and  applicable  regulations  such
securities may be resold in the absence of registration under the Securities Act
only in certain limited circumstances.  The Payee hereby represents that he, she
or it is  familiar  with Rule 144  promulgated  under  the  Securities  Act,  as
presently in effect, and understands the resale limitations  imposed thereby and
by the Securities Act.

         (b) Further  Limitations  on  Disposition.  This  Note  may  not  be
negotiated, assigned or transferred  by Payee.  The Payee further agrees not to
make any disposition of all  or any  portion of this  Note (or of the securities
issuable upon conversion hereof) unless and until:

                  (1) there is then in effect a registration statement under the
         Securities Act covering such proposed  disposition and such disposition
         is made in accordance with such registration statement;

                  (2) such disposition is made in accordance with Rule 144 under
         the Securities Act; or

                  (3) the Payee shall have notified the Maker of the proposed 
         disposition and shall have furnished the Maker with a detailed
         statement of the circumstances

                                       11


<PAGE>



         surrounding  the  proposed  disposition,   and  the  Payee  shall  have
         furnished  the Maker  with an  opinion  of  counsel,  which  opinion of
         counsel  shall be  reasonably  satisfactory  to the  Maker,  that  such
         disposition will not require  registration under the Securities Act and
         will be in compliance with applicable state securities laws.

         (c)  Legends.  It is  understood  that this  Note and each  certificate
evidencing shares of Common Stock issuable upon conversion hereof (or evidencing
any other  securities  issued with respect thereto  pursuant to any stock split,
stock  dividend,  merger or other form of  reorganization  or  recapitalization)
shall bear the legends (in addition to any legends  which may be required in the
opinion of the  Maker's  counsel by the  securities  laws of the state where the
Payee is located) substantially as set forth on the first page of this Note.

         (d) Presentment.  Except as set forth herein, Maker waives presentment,
demand and presentation for payment, notice of nonpayment and dishonor,  protest
and  notice of  protest  and  expressly  agrees  that  this Note or any  payment
hereunder  may be  extended  from time to time by the Payee  without  in any way
affecting the liability of Maker.

9.       Notices.

         (a) Notices to the Payee. Any notice required by the provisions of this
Note to be given to the holder  hereof  shall be in writing and may be delivered
by personal service,  facsimile transmission or by registered or certified mail,
return  receipt  requested,  with  postage  thereon  fully  prepaid or overnight
delivery  courier.  All such  communications  shall be addressed to the Payee of
record at its address  appearing on the books of the Maker.  Service of any such
communication  made only by mail shall be deemed  complete on the date of actual
delivery as shown by the addressee's registry or certification receipt or at the
expiration of the third (3rd) business day after the date of mailing,  whichever
is earlier in time.

         (b) Notices to the Maker.  Whenever any provision of this Note requires
a notice  to be given or a  request  to be made to the Maker by the Payee or the
holder  of any  other  security  of the  Maker  obtained  in  connection  with a
recapitalization,  merger, dividend or other event affecting this Note, then and
in each such case,  any such notice or request  shall be in writing and shall be
sent by registered or certified  mail,  return  receipt  requested  with postage
thereon fully prepaid to the Maker at its principal place of business.

         No notice given or request made hereunder  shall be valid unless signed
by the Payee of this Note or other holder  giving such notice or request (or, in
the case of a notice or request by Holders of a specified  percent in  aggregate
principal  amount of outstanding  Notes,  unless signed by each Holder of a Note
whose Note has been counted in  constituting  the requisite  percentage of Notes
required to give such notice or make such request).

10.      Events of Default.

         (a) Each of the  following  shall  constitute  an event of default  (an
"Event of Default") hereunder:  (i) the failure to pay when due any principal or
interest  hereunder and the  continuance  of such failure for a period of thirty
(30) days after written notice from the Payee


                                       12

<PAGE>



to the Maker of such failure; (ii) the violation by the Maker of any covenant or
agreement  contained in this Note and the  continuance  of such  violation for a
period of thirty (30) days after  written  notice from the Payee to the Maker of
such  failure;  (iii) any  change  in  control  of the Maker  which the Board of
Directors of the Maker deems to be hostile or  unfriendly;  (iv) the  assignment
for  the  benefit  of  creditors  by the  Maker;  (v)  the  application  for the
appointment  of a receiver or  liquidator  for the Maker or for  property of the
Maker;  (vi) the filing of a petition  in  bankruptcy  by or against  the Maker;
(vii) the issuance of an attachment or the entry of a judgment against the Maker
in excess of  $50,000;  (viii) a default by the Maker with  respect to any other
indebtedness  due to the  Payee;  (ix) the  making or  sending of a notice of an
intended  bulk  sale  by  the  Maker;  or  (x)  the  termination  of  existence,
dissolution  or  insolvency  of the  Maker.  Upon the  occurrence  of any of the
foregoing Events of Default,  this Note shall be considered to be in default and
the entire unpaid principal sum hereof, together with accrued interest, shall at
the option of the holder hereof become immediately due and payable in full. Upon
the occurrence of an Event of Default which remains  uncured as set forth herein
and the placement of this Note in the hands of an attorney for  collection,  the
Maker  agrees  to  pay  reasonable  collection  costs  and  expenses,  including
reasonable attorneys' fees and interest from the date of the default at the rate
of fifteen percent (15%) per annum computed on the unpaid principal balance.

         (b) The Payee may waive any Event of  Default  hereunder.  Such  waiver
shall be evidenced by written notice or other  document  specifying the Event or
Events  of  Default  being  waived  and  shall be  binding  on all  existing  or
subsequent Payees under this Note.

         (c)  Notwithstanding  anything  else to the contrary set forth  herein,
upon the  occurrence  of an Event of Default,  including  but not limited to the
failure to pay when due any  principal  or interest  hereunder,  the Maker shall
have six (6)  months  from  the date of the  occurrence  of each  such  Event of
Default to cure such  default,  during  which  time,  the Payee may not take any
action against the Maker with respect to collection  hereunder or enforcement of
the provisions hereof.

11. Survival.  In the event that all or a portion of the principal  hereunder is
converted pursuant to Section 3 above, Section 7 hereof relating to registration
rights  shall  survive the  termination  of this Note upon  cancellation  hereof
resulting from repayment of the balance of amounts outstanding  hereunder or the
issuance of a new note pursuant to Section 3 above.

12. Construction; Governing Law. The validity and construction of this Note and
all matters pertaining hereto are to be determined in accordance with the laws
of the State of Maryland without regard to the conflicts of law principles 
thereof.



                                       13

<PAGE>




         IN WITNESS WHEREOF,  Maker, by its appropriate  officers thereunto duly
authorized,  has  executed  this  convertible  promissory  note and  affixed its
corporate seal as of this 24th day of June, 1997.


                            ESSEX CORPORATION


                            By:   Joseph R. Kurry, Jr.
                            --------------------------
                                  Joseph R. Kurry, Jr., Chief Financial Officer


ATTEST:


By:    Sarah E. Roberts
- -----------------------
       Sarah E. Roberts, Assistant Secretary





                                       14

<PAGE>



                                 CONVERSION FORM

         The undersigned hereby elects to convert the following principal amount
of the attached  Non-Negotiable 8% Convertible Promissory Note (the "Note") (not
to exceed  $______) into shares (not to exceed  _______  shares) of Newco Common
Stock or Company  Common  Stock,  in  accordance  with the  formula set forth in
Section 2(a).


State such amount:       _____________________________________ ($___________).


Date:                                       Signature:


                        --------------------------------------------------
                           (Sign exactly as your name appears on the Note)










                                  EXHIBIT 10.20

                  8% Convertible Note Payable - Samuel Hopkins




<PAGE>



NEITHER THIS NOTE NOR THE SECURITIES  ISSUABLE UPON CONVERSION  HEREOF HAVE BEEN
THE SUBJECT OF  REGISTRATION  UNDER THE SECURITIES  ACT OF 1933, AS AMENDED,  OR
UNDER THE SECURITIES  LAWS OF ANY STATE AND THE SAME HAVE BEEN (OR WILL BE, WITH
RESPECT TO THE SECURITIES ISSUABLE UPON CONVERSION HEREOF) ISSUED IN RELIANCE ON
EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SAID ACT AND SUCH LAWS. NEITHER
THIS  NOTE NOR THE  SECURITIES  ISSUABLE  UPON  CONVERSION  HEREOF  MAY BE SOLD,
TRANSFERRED,  PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF EXCEPT AS PERMITTED
UNDER SUCH SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.


                  NON-NEGOTIABLE 8% CONVERTIBLE PROMISSORY NOTE

$ 20,000                                                    Columbia, Maryland
June 24, 1997

         FOR VALUE RECEIVED,  the  undersigned,  Essex  Corporation,  a Virginia
corporation  (hereinafter  referred to as the "Maker" or the  "Company")  hereby
promises to pay Samuel Hopkins (the "Payee") at 45 Warrenton Road, Baltimore, MD
21210  or at such  other  place  as the  holder  hereof  may  from  time to time
designate in writing,  the principal sum of Twenty  Thousand and 00/100  Dollars
($20,000) in one  installment due upon the earlier of: (i) one (1) year from the
date of issuance of the  promissory  note;  or (ii) ten (10) business days after
the date of consummation of stock  acquisition/sale  of substantially all of the
assets or the merger of the Company by or with an  unrelated  entity or business
enterprise (the "Acquisition"), which transaction requires shareholder approval.
Interest  shall be paid by Maker to the Payee on the Maturity Date at the simple
rate of eight (8%) percent per annum computed on the unpaid  principal  balance.
By  acceptance  of this  Non-Negotiable  8%  Convertible  Promissory  Note  (the
"Note"), the Payee represents, warrants, covenants and agrees that he, she or it
will abide by and be bound by its terms.

1. Prepayment,  Extension and Notices.  The unpaid principal balance outstanding
under this Note may be prepaid in part or in full by the Maker without  penalty,
upon  fifteen  (15) days notice to the Payee  stating the  repayment  amount and
repayment  date (the  "Repayment  Date").  The Maker must provide  notice of its
intention  to prepay  amounts  outstanding  hereunder at least five (5) business
days prior to the Maturity Date to the Payee.

2. Conversion.  The  unpaid  principal  amount of this  Note and  the  interest 
thereon,  shall be  convertible  at the option  of the  Payee (the "Conversion 
Right") prior to the Maturity Date, in  the manner and on the terms hereinafter 
set forth, into shares of common stock of the  Company, par value ($.10) at any 
time prior to  the Maturity Date at a  conversion price equal to the greater of
market value on  the date that  the election to  convert is made or fifty cents
($.50) per shares, subject to adjustment pursuant to Section 4 hereof; provided
however, that in  the event  the assets of the  optoelectronics division of the
Company have been transferred to another business

                                       1


<PAGE>



enterprise  [in  which  the  Company  has a  controlling  shareholder  interest]
("Transferee"), and at the election of the Payee, the unpaid principal amount of
this  Note  and the  accrued  interest  thereon,  shall  be  convertible  into a
percentage  equity  interest  of  the  Transferee  determined  pursuant  to  the
following formula:

                   x/y where x is the dollar amount  converted and y is the fair
                  market  value (or mean  fair  market  value,  if more than one
                  valuation  methodology  is utilized) as  determined by a third
                  party  expert in  providing  such  valuations  retained by the
                  Company..

         (b) Notice of the right to convert  shall be given  promptly  after the
date of Acquisition  and Maker shall have the period of time between such Notice
date and the Maturity  Date (but in no event less than ten (10)  business  days)
during which Payee shall have the  opportunity to elect to convert the principal
and interest into Newco Common Stock, or receive cash payment.

         (c)  Notwithstanding  any other provision of this Note to the contrary,
upon  receipt  of notice  of the  Maker's  intent  to prepay  part or all of the
principal  amount  hereunder or of an  Accelerated  Maturity Date, the Payee may
elect to exercise  the  Conversion  Right and convert a portion (as set forth in
subsection (a) hereof) of the amount of unpaid principal which the Maker intends
to  prepay,  up to the close of  business  on the last  business  day before the
stated Repayment Date.

         (d)  Notwithstanding  any other provision hereof,  the Conversion Right
may not be exercised at any time during which a registration statement under the
Securities Act of 1933 is filed but not effective  absent written consent of the
Company.

3. Conversion  Procedure.  The Conversion Right may be exercised by the Payee by
the surrender of this Note (along with the conversion form attached hereto, duly
executed) to the Maker at the principal office of the Maker.  Risk of loss prior
to  surrender  of this  Note  shall be borne by the  Payee.  Consequently,  hand
delivery with written  acknowledgement  of receipt by the Maker or registered or
certified  mail,  return receipt  requested,  is the preferred mode of delivery.
Conversion  shall be deemed to have been effected on the date when such delivery
of the conversion  notice is actually made or, if earlier,  at the expiration of
five (5) calendar  days after being sent to the Maker by the Payee by registered
or certified mail, return receipt requested,  with postage thereon fully prepaid
(the "Conversion Date"). As promptly as practicable thereafter,  the Maker shall
issue and  deliver  to the Payee:  (a) a new note  representing  the  difference
between the  principal  amount of this Note plus  interest  accrued  through the
Conversion  Date,  and the  principal  amount  hereof  which has been  converted
pursuant  hereto;  and (b)  certificates  representing  the  number of shares of
Common Stock to which the Payee is entitled. The Maker shall not be obligated to
issue certificates  representing shares of Common Stock in the name of any party
other  than the  Payee.  The  person or entity  in whose  name the  certificates
representing the shares of Common Stock issuable upon conversion hereof shall be
deemed to have become a holder of record on the next succeeding day on which the
transfer books are open, but the Conversion Price shall be that in effect on the
Conversion  Date. The Maker  covenants  that all securities  which may be issued
upon exercise


                                       2

<PAGE>



of the Conversion Right will, upon issuance, be fully paid and nonassessable and
free of all taxes, liens and charges caused or created by the Maker with respect
to the issuance thereof.

4. Adjustments. The Conversion Price and the number and kind of securities which
may be received upon the  exercise of  the Conversion Right shall be subject to
adjustment from time to time upon the happening of certain events, as follows:

         (a) Stock  Splits and  Combinations.  If the Maker shall at any time or
from time to time after the date hereof effect a subdivision of its  outstanding
shares of Common Stock, the Conversion Price then in effect  immediately  before
such subdivision  shall be  proportionately  decreased,  and conversely,  if the
Maker shall at any time or from time to time after the date  hereof  combine its
outstanding  shares  of  Common  Stock,  the  Conversion  Price  then in  effect
immediately  before such combination  shall be  proportionately  increased.  Any
adjustment  under this section shall become effective upon the close of business
on the date the subdivision or combination becomes effective.

         (b) Certain  Dividends and  Distributions.  In the event that the Maker
shall at any time or from time to time after the date hereof  make or issue,  or
fix a record  date for the  determination  of holders of shares of Common  Stock
entitled to  receive,  a dividend or other  distribution  payable in  additional
shares of Common Stock,  then and in each such event,  the Conversion Price then
in effect shall be  decreased  as of the time of such  issuance or, in the event
that such a record  date shall have been  fixed,  as of the close of business on
such  record  date,  by  multiplying  the  Conversion  Price then in effect by a
fraction:

                  (1) the numerator of which shall be the total number of shares
of Common Stock  issued and  outstanding  immediately  prior to the time of such
issuance or the close of business on such record date; and

                  (2) the  denominator  of which  shall be the sum of the  total
number of shares of Common Stock issued and outstanding immediately prior to the
time of such  issuance  or the close of  business  on such  record  date and the
number of shares of  Common  Stock  issuable  in  payment  of such  dividend  or
distribution;  provided, however, that if such record date shall have been fixed
and such dividend is not fully paid or if such distribution is not fully made on
the date fixed therefor, the Conversion Price shall be recomputed accordingly as
of the close of  business on such record  date and  thereafter  such  Conversion
Price shall be adjusted  pursuant  to this  subsection  as of the time of actual
payment of such dividends or distributions.

         (c) Other Dividends and  Distributions.  In the event that the Maker at
any time or from time to time after the date hereof shall make or issue,  or fix
a record  date for the  determination  of  holders  of shares  of  Common  Stock
entitled to receive, a dividend or other  distribution  payable in securities of
the  Maker  other  than  shares  of Common  Stock,  then and in each such  event
provisions  shall be made so that the  holder of this Note shall  receive,  upon
conversion  of this Note,  in addition  to the number of shares of Common  Stock
receivable  thereupon,  the amount of  securities of the Maker which such holder
would have received had its Note been  converted  into shares of Common Stock on
the date of such event and had  thereafter,  during the period  from the date of
such event to and including the Conversion Date,


                                       3

<PAGE>



retained such securities (together with any distributions payable thereon during
such period)  receivable by the holder as aforesaid  during such period,  giving
application to all adjustments  called for during such period under this section
with respect to the rights of the holder of the Note.

         (d) Reclassification, Exchange or Substitution. If the shares of Common
Stock  issuable upon the  conversion of this Note shall be changed into the same
or different number of shares of any class or classes of capital stock,  whether
by  capital   reorganization,   reclassification  or  otherwise  (other  than  a
subdivision or combination of shares or stock dividend  provided for above, or a
reorganization,  merger,  consolidation  or  sale  of  assets  provided  for  in
subsection  (e)  below),  then and in each such  event,  the holder of this Note
shall have the right thereafter to convert this Note into the kind and amount of
shares of capital stock and other  securities and property  receivable upon such
reorganization, reclassification or other change, as the holder of the number of
shares  of  Common  Stock  into  which  this  Note  might  have  been  converted
immediately  prior  to such  reorganization,  reclassification  or  change,  all
subject to further adjustment as provided herein.

         (e) Reorganization, Merger, Consolidation or Sale of Assets. If, at any
time or from time to time, there shall be a capital reorganization of the shares
of Common  Stock (other than a  subdivision,  combination,  reclassification  or
exchange  of shares  provided  for  elsewhere  in this  section)  or a merger or
consolidation of the Maker with or into another corporation,  or the sale of all
or substantially all of the Maker's properties and assets to any other person or
entity, then as a part of such  reorganization,  merger,  consolidation or sale,
provision  shall be made so that the  holder of this Note  shall  thereafter  be
entitled  to  receive  upon  conversion  of this  Note,  the number of shares of
capital stock or other  securities or property of the Maker, or of the successor
corporation  resulting from such merger or  consolidation  or sale, to which the
holder of shares of Common Stock  deliverable  upon  conversion  would have been
entitled on such  reorganization,  merger,  consolidation,  or sale. In any such
case,  appropriate adjustment shall be made in the application of the provisions
of this  section with respect to the rights of the holder of this Note after the
reorganization,  merger, consolidation or sale to the end that the provisions of
this section  (including  adjustment of the Conversion  Price then in effect and
the number of shares of Common Stock  receivable  upon  conversion of this Note)
shall be  applicable  after  that  event as nearly  equivalent  hereto as may be
practicable.

         (f) Material  Financing.  If the Corporation at an time during a twelve
(12) month period  commencing on the date of issuance of the Note, enters into a
transaction with a third party which is intended to provide  material  financing
to the Corporation,  and such transaction  includes rights of conversion similar
to those  granted in this Note,  then the  Conversion  Price  shall be  adjusted
downward to be equal to the Conversion Price granted to such third party.

         (g) Minimum  Adjustment.  Notwithstanding  anything to the contrary set
forth herein,  no adjustment of the Conversion  Price shall be made in an amount
equal to less than one cent  ($.01),  but any such  lesser  adjustment  shall be
carried  forward  and  shall  be made at the  time  and  together  with the next
subsequent  adjustment  which together with any  adjustments so carried  forward
shall amount to one cent ($.01) or more.



                                       4

<PAGE>



         (h)  Certificate of Adjustment.  Upon the occurrence of each adjustment
or readjustment of the applicable Conversion Price pursuant to this section, the
Maker shall promptly  compute such adjustment or readjustment in accordance with
the  terms  hereof  and  prepare  and  furnish  to the  holder  of  this  Note a
certificate,  signed by the  Chairman of the Board,  the  President or the Chief
Financial Officer,  setting forth such adjustment or readjustment and showing in
detail the facts upon which such adjustment or readjustment is based.

         (i)      Notices of Record Date.  If and in the event that:

                  (1) the  Maker  shall  set a record  date for the  purpose  of
entitling  the holders of shares of Common  Stock to receive a dividend,  or any
other distribution, payable otherwise than in cash;

                  (2) the  Maker  shall  set a record  date for the  purpose  of
entitling the holders of shares of Common Stock to subscribe for or purchase any
shares of any class or to receive any other rights;

                  (3) there shall occur any capital reorganization of the Maker,
reclassification  of the  shares of  capital  stock of the Maker  (other  than a
subdivision  or  combination  of  its  outstanding   shares  of  Common  Stock),
consolidation or merger of the Maker with or into another  corporation,  or sale
of all or substantially all of the assets of the Maker; or

                  (4) there shall occur a voluntary or involuntary dissolution,
liquidation, or winding up of the Maker;

then,  and in any such case, the Maker shall cause to be mailed to the holder of
record of this Note, at least [thirty (30) days] prior to the dates  hereinafter
specified,  a notice stating the date: (A) which has been set as the record date
for the purpose of such dividend,  distribution, or rights; or (B) on which such
reclassification,  reorganization,  consolidation,  merger,  sale,  dissolution,
liquidation  or winding up is to take place and the record  date as of which the
holder of record shall be entitled to exchange this Note for securities or other
property deliverable upon such reclassification,  reorganization, consolidation,
merger, sale, dissolution, liquidation or winding up.

5.  Reservation.  The Maker covenants  that,  during the period within which the
Conversion  Right may be exercised,  the Maker will at all times have authorized
and reserved for the purpose of issuance upon exercise of the Conversion  Right,
a sufficient  number of shares of Common Stock (or other  securities  subject to
the  Conversion  Right) to provide for the exercise of the  Conversion  Right in
full.

6. Fractional  Shares. No fractional shares of Common Stock shall be issued upon
conversion  of this Note.  In lieu of any  fractional  shares of Common Stock to
which the Payee would otherwise be entitled, the Maker shall pay an amount equal
to the  product of such  fraction  multiplied  by the fair value of one share of
Common Stock on the Conversion Date, as determined in good faith by the Board of
Directors of the Maker.


                                       5


<PAGE>



7.       Registration Rights. The Maker hereby covenants and agrees as follows:

         (a)      Definitions.  For purposes of this section:

                  (1) The  terms  "register,"  "registered"  and  "registration"
         refer to a registration effected by preparing and filing a registration
         statement or similar  document in compliance with the Securities Act of
         1933,  as  amended  (the  "Securities  Act"),  and the  declaration  of
         effectiveness of such  registration  statement or other document by the
         Securities and Exchange Commission (the "SEC").

                  (2) The term "Registrable Securities" means: (A) the shares of
         Common Stock issued or issuable  upon  conversion  of this Note; or (B)
         any other  securities  of the Maker  issued  as (or  issuable  upon the
         conversion or exercise of any warrant, right or other security which is
         issued  as) a  dividend  or other  distribution  with  respect  to,  in
         exchange for or in replacement of the shares of Common Stock referenced
         in subsection (A) immediately above,  excluding in all cases,  however,
         any   Registrable   Securities   sold  to  the  public  pursuant  to  a
         registration or an exemption from registration.

                  (3) The  number  of  shares of  "Registrable  Securities  then
         outstanding"  shall be the number of securities  outstanding  which are
         Registrable Securities.

                  (4) The term  "Holder" as used  hereinafter  in this Section 7
         means any person or entity owning of record Registrable Securities.

         (b) Piggy-Back  Registration Rights. In the event that (but without any
obligation to do so) the Maker proposes to register any of its securities  under
the Securities  Act in connection  with the public  offering of such  securities
solely for cash (other  than a  registration  on Form S-4,  Form S-8 or any form
which does not include  substantially  the same information as would be required
to be included in a registration  statement covering the sale of the Registrable
Securities),  the Maker shall  promptly give each Holder  written notice of such
registration (the "Piggy-Back Notice");  provided, however, that the Maker shall
have no  obligation  to so  notify  Holders  with  respect  to any  registration
subsequent  to the first of such  registrations  to occur after the  issuance of
this  Note and shall  have no  obligation  if such  registration  relates  to an
underwritten  offering by the Maker and the managing  underwriter of the subject
proposed offering expresses its objection thereto to the Maker. Upon the written
request of each  Holder  given  within  twenty  (20) days after  receipt of such
Piggy-Back Notice from the Maker, the Maker shall,  subject to the provisions of
Subsections  7(h)  and 7(m)  below,  cause to be  included  in the  registration
statement  filed by the Maker under the  Securities  Act all of the  Registrable
Securities  that each such  Holder has  requested  to be  registered;  provided,
however,  that the Maker  shall  have no such  obligation  if such  registration
statement  relates to an  underwritten  offering  by the Maker and the  managing
underwriter  of the subject  offering has expressed its objection to the same to
the Maker. To the extent that a Holder is offered the  opportunity  hereunder to
include all of its  Registrable  Securities in a  registration  statement,  such
Holder will be deemed to have exercised its sole piggy-back  registration  right
provided by this Subsection 7(c).



                                       6

<PAGE>



         (c) Obligations of the Maker.  Whenever the Maker shall elect to file a
registration statement to effect the registration of any Registrable Securities,
the Maker shall, as expeditiously as reasonably possible:

                  (1)  Prepare  and file with the SEC a  registration  statement
with respect to such  Registrable  Securities  and use its best efforts to cause
such registration  statement to become  effective,  and, upon the request of the
Holders of at least fifty percent (50%) of the Registrable Securities registered
thereunder,  keep such  registration  statement  effective for at least four (4)
months.

                  (2)  Prepare  and  file  with  the  SEC  such  amendments  and
supplements to such registration  statement and the prospectus  included therein
as may be necessary to comply with the  provisions  of the  Securities  Act with
respect  to the  disposition  of all  securities  covered  by such  registration
statement.

                  (3)  Furnish  to the  Holders  such  numbers  of  copies  of a
prospectus,   including  a  preliminary  prospectus,   in  conformity  with  the
requirements  of the  Securities  Act,  and  such  other  documents  as they may
reasonably  request  in order  to  facilitate  the  disposition  of  Registrable
Securities owned by them.

                  (4)  Use  its  best   efforts  to  register  and  qualify  the
securities  covered by such registration  statement under the securities laws of
such  jurisdictions  as shall be  reasonably  requested  by the  Holders for the
distribution of the securities covered by the registration  statement,  provided
that the Maker shall not be required in  connection  therewith or as a condition
thereto  to qualify to do  business  or to file a general  consent to service of
process in any such jurisdiction.

                  (5) In the event of any underwritten  public  offering,  enter
into and perform its  obligations  under an  underwriting  agreement  with terms
generally satisfactory to the managing underwriter of such offering.

                  (6) Notify the  Holders  promptly  after the Maker  shall have
received notice thereof,  of the time when the  registration  statement  becomes
effective or any supplement to any prospectus forming a part of the registration
statement has been filed.

                  (7)  Notify  the  Holders  of any stop  order  suspending  the
effectiveness of the registration  statement and use its reasonable best efforts
to remove such stop order.

         (d)  Furnish  Information.  It shall be a  condition  precedent  to the
obligations  of the Maker to take any  action  pursuant  hereto  that any Holder
seeking to include any of its Registrable Securities in a registration statement
filed by the Maker pursuant  hereto shall furnish to the Maker such  information
regarding itself, the Registrable Securities held by it, and the intended method
of  disposition  of  such   securities  as  shall  be  required  to  effect  the
registration of its Registrable Securities. In that connection, each such Holder
shall be required to represent to the Maker that all such  information  which is
given is both  complete  and  accurate in all  material  respects.  Each of such
Holders shall deliver to the Maker a statement in writing from


                                       7

<PAGE>



the beneficial  owners of such securities that such beneficial  owners bona fide
intend to sell, transfer or otherwise dispose of such securities.

         (e)      Definition of Expenses.

                  (1)  "Registration  Expenses" shall mean all expenses incurred
by the Maker in complying with Sections 7(c) and 7(d) hereof,  including without
limitation,  all  registration  and filing  fees,  printing  expenses,  fees and
disbursements  of counsel  for the Maker,  blue sky fees and  expenses,  and the
expense of any special audits  incident to or required by any such  registration
(but excluding the compensation of regular employees of the Maker which shall be
paid in any event by the Maker).

                  (2) "Selling Expenses" shall mean all underwriting  discounts,
selling commissions and underwriters'  expense allowance  applicable to the sale
and all fees and  disbursements  of any special  counsel (other than the Maker's
regular counsel) for any Holder.

         (f) Expenses of  Registration.  All Registration  Expenses  incurred in
connection with any registration, qualification or compliance herewith, shall be
borne by the Maker,  and all Selling  Expenses  shall be borne by the Holders of
the  securities so registered pro rata on the basis of the number of Registrable
Securities so registered.

         (g)  Underwriting  Requirements.  All Holders  proposing to  distribute
their  securities  through an underwriting  pursuant hereto shall (together with
the Maker and any other  holders  distributing  their  securities  through  such
underwriting)  enter into an  underwriting  agreement in customary form with the
underwriter   or   underwriters   selected  for   underwriting   by  the  Maker.
Notwithstanding  any other  provision  of this  section,  at the  request of the
managing underwriter,  the Holder shall delay the sale of Registrable Securities
which such Holder has requested be registered  under this section for the ninety
(90)  day  period  commencing  with  the  effective  date  of  the  registration
statement.  Notwithstanding anything to the contrary herein, no such delay shall
be required with respect to securities offered by holders of securities who have
requested  the  Maker  to  register  such  securities  pursuant  to a  mandatory
registration  obligation of the Maker if other security holders of the Maker who
have not made  requests  pursuant  to such an  obligation  are not  subject to a
similar delay. If any Holder  disapproves of the terms of any such underwriting,
he may  elect to  withdraw  therefrom  by  written  notice  to the Maker and the
underwriter.   Any  Registrable  Securities  excluded  or  withdrawn  from  such
underwriting  shall  not be  withdrawn  from  such  registration  except  at the
election of the Holder.

         (h) Delay of Registration.  No Holder shall have any right to obtain or
seek an injunction  restraining or otherwise  delaying any such  registration as
the  result  of  any   controversy   that  might  arise  with   respect  to  the
interpretation or implementation of this section.

         (i) Indemnification.  In the event that any Registrable Securities are
included in a registration statement pursuant hereto:

                  (1) To the extent  permitted by law, the Maker will  indemnify
         and hold harmless each Holder, the officers,  directors and partners of
         each Holder, any


                                       8

<PAGE>



         underwriter (as defined in the Securities Act) for such Holder and each
         person or entity,  if any,  that  controls  such Holder or  underwriter
         within the meaning of the Securities Act or the Securities Exchange Act
         of 1934, as amended (the "Exchange Act"),  against any losses,  claims,
         damages  or  liabilities  (joint or  several)  to which they may become
         subject under the Securities  Act, the Exchange Act or other federal or
         state law, insofar as such losses,  claims,  damages or liabilities (or
         actions in respect  thereof)  arise out of or are based upon any of the
         following   statements,   omissions  or  violations   (collectively   a
         "Violation"): (A) any untrue statement or alleged untrue statement of a
         material fact contained in such registration  statement,  including any
         preliminary  prospectus or final  prospectus  contained  therein or any
         amendments or supplements thereto; (B) the omission or alleged omission
         to state  therein a material  fact  required to be stated  therein,  or
         necessary to make the  statements  therein not  misleading;  or (C) any
         violation or alleged  violation by the Maker of the Securities Act, the
         Exchange  Act,  any  state  securities  law or any  rule or  regulation
         promulgated  under the  Securities  Act,  the Exchange Act or any state
         securities law; and the Maker will reimburse each such Holder, officer,
         director or partner, underwriter or controlling person for any legal or
         other  expenses   reasonably   incurred  by  them  in  connection  with
         investigating or defending any such loss, claim,  damage,  liability or
         action;  provided,  however,  that the indemnity agreement contained in
         this  subsection  shall not apply to amounts paid in  settlement of any
         such loss,  claim,  damage,  liability or action if such  settlement is
         effected  without the consent of the Maker (which  consent shall not be
         unreasonably withheld),  nor shall the Maker be liable in any such case
         for any such loss,  claim,  damage,  liability  or action to the extent
         that it arises  out of or is based  upon a  Violation  which  occurs in
         reliance  upon and in  conformity  with written  information  furnished
         expressly  for use in  connection  with such  registration  by any such
         Holder,  underwriter  or  controlling  person;  and  further  provided,
         however,  that the  foregoing  indemnity  agreement  is  subject to the
         condition that, insofar as it relates to any untrue statement,  alleged
         untrue statement,  omission or alleged omission made in any preliminary
         prospectus  but  eliminated or remedied in the  definitive  prospectus,
         such  indemnity  agreement  shall  not  inure  to  the  benefit  of the
         underwriter  (or the benefit of any person or entity that controls such
         underwriter),  if a copy of the  definitive  prospectus was not sent or
         given to such person or entity with or prior to the confirmation of the
         sale of such securities to such person or entity.

                  (2) To the extent  permitted by law, each selling  Holder will
         indemnify and hold harmless the Maker,  each of its directors,  each of
         its officers who have signed the registration  statement,  each person,
         if any, who controls the Maker within the meaning of the Securities Act
         or the  Exchange  Act,  any  underwriter  (within  the  meaning  of the
         Securities Act) for the Maker, any person who (or entity that) controls
         such  underwriter,  and any other  Holder  selling  securities  in such
         registration  statement  or any of its  directors  or  officers  or any
         person who controls such Holder, against any losses, claims, damages or
         liabilities (joint or several) to which the Maker or any such director,
         officer,  controlling person (or entity), or underwriter or controlling
         person, or other such Holder or director, officer or controlling person
         may become subject, under the Securities Act, the Exchange Act or other
         federal  or state  law,  insofar  as such  losses,  claims,  damages or
         liabilities  (or actions in respect  thereto) arise out of or are based
         upon any Violation, in each case to the extent (and only to the extent)
         that such Violation occurs in reliance


                                       9

<PAGE>



         upon and in  conformity  with  written  information  furnished  by such
         Holder expressly for use in connection with such registration; and each
         such  Holder  will  reimburse  any legal or other  expenses  reasonably
         incurred by the Maker or any such director, officer, controlling person
         (or entity),  underwriter  or  controlling  person (or  entity),  other
         Holder,  officer,  director or  controlling  person in connection  with
         investigating or defending any such loss, claim,  damage,  liability or
         action;  provided,  however,  that the indemnity agreement contained in
         this  subsection  shall not apply to amounts paid in  settlement of any
         such loss,  claim,  damage,  liability or action if such  settlement is
         effected without the consent of the Holder,  which consent shall not be
         unreasonably withheld.

                  (3) Promptly after receipt by an indemnified  party under this
         Section 7(i) of notice of the commencement of any action (including any
         governmental  action),  such  indemnified  party  will,  if a claim  in
         respect thereof is to be made against any indemnifying party under this
         Section  7(i),  notify  the  indemnifying   party  in  writing  of  the
         commencement thereof and the indemnifying party shall have the right to
         participate in, and, to the extent the  indemnifying  party so desires,
         jointly with any other indemnifying party similarly notified, to assume
         the defense thereof with counsel mutually  satisfactory to the parties;
         provided,  however,  that an indemnified  party shall have the right to
         retain its own  counsel,  with the fees and  expenses to be paid by the
         indemnifying  party, if representation of such indemnified party by the
         counsel retained by the indemnifying  party would be inappropriate  due
         to actual or potential  differing  interests  between such  indemnified
         party  and  any  other  party  represented  by  such  counsel  in  such
         proceeding.  The  failure  to notify  an  indemnifying  party  within a
         reasonable time of the  commencement of any such action,  to the extent
         prejudicial  to its ability to defend such action,  shall  relieve such
         indemnifying party of any liability to the indemnified party under this
         Section 7(i), but the omission so to notify the indemnifying party will
         not  relieve it of any  liability  that it may have to any  indemnified
         party otherwise than under this Section 7(i).

         (j) Reports Under  Securities  Exchange Act of 1934. With a view toward
making  available  to Holders  the  benefits of Rule 144  promulgated  under the
Securities  Act and any other rule or regulation of the SEC that may at any time
permit  a  Holder  to  sell  securities  of  the  Maker  to the  public  without
registration, the Maker agrees to:

                  (1) use its best efforts to make and  keep public information
         available, as those terms are  understood  and defined in Rule 144, at 
         all times;

                  (2) use its  best  efforts  to file  with  the SEC in a timely
         manner all reports and other documents  required of the Maker under the
         Securities Act and the Exchange Act; and

                  (3)  furnish to any  Holder,  so long as the  Holder  owns any
         Registrable Securities,  forthwith upon request such information as may
         be  reasonably  requested in order to allow any Holder to avail himself
         of any rule or  regulation  of the SEC which permits the selling of any
         such securities without registration.


                                       10


<PAGE>



         (k)  Termination of the Maker's Obligations.

                  (1) The Maker shall have no  obligation  pursuant to Section 7
with respect to any request made by any Holder  after the first  anniversary  of
the Maturity Date.

                  (2) Notwithstanding any provision hereof to the contrary,  the
Maker shall not be required to effect any registration  under the Securities Act
or under any state securities laws on behalf of any Holder or Holders if, in the
opinion of counsel  for the Maker,  the  offering  or transfer by such Holder or
Holders in the manner proposed  (including,  without  limitation,  the number of
shares  proposed  to be offered or  transferred  and the method of  offering  or
transfer) is exempt from the registration requirements of the Securities Act and
the securities laws of applicable states.

         (l) Lock Ups;  Limitation  on  Rights.  The Payee  (and any  subsequent
Holder) by acceptance hereof hereby agrees that, in the event that subsequent to
the date  hereof,  the Maker  conducts an  underwritten  public  offering of its
securities:  (i) the right to request  registration  pursuant to the  provisions
hereof  shall be subject  to the  approval  of the  underwriter  of such  public
offering;  and (ii) the Payee (and any subsequent Holder) shall agree to refrain
from exercising such rights or selling,  transferring or otherwise  disposing of
any of the  Registrable  Securities for a period of up to thirteen months should
the underwriter so request in writing.

8.       Miscellaneous.

         (a) Restricted Securities.  By acceptance hereof, the Payee understands
and  agrees  that  this  Note and the  shares  of  Common  Stock  issuable  upon
conversion hereof are "restricted  securities" under the federal securities laws
inasmuch  as they are  being  acquired  from  the  Maker  in a  transaction  not
involving a public offering and have not been the subject of registration  under
the  Securities  Act and that under such laws and  applicable  regulations  such
securities may be resold in the absence of registration under the Securities Act
only in certain limited circumstances.  The Payee hereby represents that he, she
or it is  familiar  with Rule 144  promulgated  under  the  Securities  Act,  as
presently in effect, and understands the resale limitations  imposed thereby and
by the Securities Act.

         (b) Further  Limitations  on  Disposition.   This  Note  may  not  be
negotiated, assigned or  transferred by Payee.  The Payee further agrees not to
make any disposition of all or  any portion of this  Note (or of the securities 
issuable upon conversion hereof) unless and until:

                  (1) there is then in effect a registration statement under the
         Securities Act covering such proposed  disposition and such disposition
         is made in accordance with such registration statement;

                  (2) such disposition is made in accordance with Rule 144 under
         the Securities Act; or

                  (3) the Payee shall  have notified  the Maker of the proposed 
         disposition  and  shall  have  furnished  the  Maker  with  a detailed 
         statement of the circumstances


                                       11

<PAGE>



         surrounding  the  proposed  disposition,   and  the  Payee  shall  have
         furnished  the Maker  with an  opinion  of  counsel,  which  opinion of
         counsel  shall be  reasonably  satisfactory  to the  Maker,  that  such
         disposition will not require  registration under the Securities Act and
         will be in compliance with applicable state securities laws.

         (c)  Legends.  It is  understood  that this  Note and each  certificate
evidencing shares of Common Stock issuable upon conversion hereof (or evidencing
any other  securities  issued with respect thereto  pursuant to any stock split,
stock  dividend,  merger or other form of  reorganization  or  recapitalization)
shall bear the legends (in addition to any legends  which may be required in the
opinion of the  Maker's  counsel by the  securities  laws of the state where the
Payee is located) substantially as set forth on the first page of this Note.

         (d) Presentment.  Except as set forth herein, Maker waives presentment,
demand and presentation for payment, notice of nonpayment and dishonor,  protest
and  notice of  protest  and  expressly  agrees  that  this Note or any  payment
hereunder  may be  extended  from time to time by the Payee  without  in any way
affecting the liability of Maker.

9.       Notices.

         (a) Notices to the Payee. Any notice required by the provisions of this
Note to be given to the holder  hereof  shall be in writing and may be delivered
by personal service,  facsimile transmission or by registered or certified mail,
return  receipt  requested,  with  postage  thereon  fully  prepaid or overnight
delivery  courier.  All such  communications  shall be addressed to the Payee of
record at its address  appearing on the books of the Maker.  Service of any such
communication  made only by mail shall be deemed  complete on the date of actual
delivery as shown by the addressee's registry or certification receipt or at the
expiration of the third (3rd) business day after the date of mailing,  whichever
is earlier in time.

         (b) Notices to the Maker.  Whenever any provision of this Note requires
a notice  to be given or a  request  to be made to the Maker by the Payee or the
holder  of any  other  security  of the  Maker  obtained  in  connection  with a
recapitalization,  merger, dividend or other event affecting this Note, then and
in each such case,  any such notice or request  shall be in writing and shall be
sent by registered or certified  mail,  return  receipt  requested  with postage
thereon fully prepaid to the Maker at its principal place of business.

         No notice given or request made hereunder  shall be valid unless signed
by the Payee of this Note or other holder  giving such notice or request (or, in
the case of a notice or request by Holders of a specified  percent in  aggregate
principal  amount of outstanding  Notes,  unless signed by each Holder of a Note
whose Note has been counted in  constituting  the requisite  percentage of Notes
required to give such notice or make such request).

10.      Events of Default.

         (a) Each of the  following  shall  constitute  an event of default  (an
"Event of Default") hereunder:  (i) the failure to pay when due any principal or
interest  hereunder and the  continuance  of such failure for a period of thirty
(30) days after written notice from the Payee


                                       12

<PAGE>



to the Maker of such failure; (ii) the violation by the Maker of any covenant or
agreement  contained in this Note and the  continuance  of such  violation for a
period of thirty (30) days after  written  notice from the Payee to the Maker of
such  failure;  (iii) any  change  in  control  of the Maker  which the Board of
Directors of the Maker deems to be hostile or  unfriendly;  (iv) the  assignment
for  the  benefit  of  creditors  by the  Maker;  (v)  the  application  for the
appointment  of a receiver or  liquidator  for the Maker or for  property of the
Maker;  (vi) the filing of a petition  in  bankruptcy  by or against  the Maker;
(vii) the issuance of an attachment or the entry of a judgment against the Maker
in excess of  $50,000;  (viii) a default by the Maker with  respect to any other
indebtedness  due to the  Payee;  (ix) the  making or  sending of a notice of an
intended  bulk  sale  by  the  Maker;  or  (x)  the  termination  of  existence,
dissolution  or  insolvency  of the  Maker.  Upon the  occurrence  of any of the
foregoing Events of Default,  this Note shall be considered to be in default and
the entire unpaid principal sum hereof, together with accrued interest, shall at
the option of the holder hereof become immediately due and payable in full. Upon
the occurrence of an Event of Default which remains  uncured as set forth herein
and the placement of this Note in the hands of an attorney for  collection,  the
Maker  agrees  to  pay  reasonable  collection  costs  and  expenses,  including
reasonable attorneys' fees and interest from the date of the default at the rate
of fifteen percent (15%) per annum computed on the unpaid principal balance.

         (b) The Payee may waive any Event of  Default  hereunder.  Such  waiver
shall be evidenced by written notice or other  document  specifying the Event or
Events  of  Default  being  waived  and  shall be  binding  on all  existing  or
subsequent Payees under this Note.

         (c)  Notwithstanding  anything  else to the contrary set forth  herein,
upon the  occurrence  of an Event of Default,  including  but not limited to the
failure to pay when due any  principal  or interest  hereunder,  the Maker shall
have six (6)  months  from  the date of the  occurrence  of each  such  Event of
Default to cure such  default,  during  which  time,  the Payee may not take any
action against the Maker with respect to collection  hereunder or enforcement of
the provisions hereof.

11. Survival.  In the event that all or a portion of the principal  hereunder is
converted pursuant to Section 3 above, Section 7 hereof relating to registration
rights  shall  survive the  termination  of this Note upon  cancellation  hereof
resulting from repayment of the balance of amounts outstanding  hereunder or the
issuance of a new note pursuant to Section 3 above.

12. Construction; Governing Law.  The validity and construction of this Note and
all matters pertaining  hereto are to be determined in accordance with the laws
of the  State of  Maryland without regard to  the  conflicts of law  principles
thereof.


                                       13


<PAGE>




         IN WITNESS WHEREOF,  Maker, by its appropriate  officers thereunto duly
authorized,  has  executed  this  convertible  promissory  note and  affixed its
corporate seal as of this 24th day of June, 1997.


                            ESSEX CORPORATION


                            By:  Joseph R. Kurry, Jr.
                            -------------------------
                                 Joseph R. Kurry, Jr., Chief Financial Officer


ATTEST:


By:   Sarah E. Roberts
- ----------------------
      Sarah E. Roberts, Assistant Secretary




                                       14


<PAGE>



                                 CONVERSION FORM

         The undersigned hereby elects to convert the following principal amount
of the attached  Non-Negotiable 8% Convertible Promissory Note (the "Note") (not
to exceed  $______) into shares (not to exceed  _______  shares) of Newco Common
Stock or Company  Common  Stock,  in  accordance  with the  formula set forth in
Section 2(a).


State such amount:       _____________________________________ ($___________).


Date:                                       Signature:


                           -------------------------------------------------
                             (Sign exactly as your name appears on the Note)








                                  EXHIBIT 10.21

                 8% Convertible Note Payable - Harold P. Hanson




<PAGE>



NEITHER THIS NOTE NOR THE SECURITIES  ISSUABLE UPON CONVERSION  HEREOF HAVE BEEN
THE SUBJECT OF  REGISTRATION  UNDER THE SECURITIES  ACT OF 1933, AS AMENDED,  OR
UNDER THE SECURITIES  LAWS OF ANY STATE AND THE SAME HAVE BEEN (OR WILL BE, WITH
RESPECT TO THE SECURITIES ISSUABLE UPON CONVERSION HEREOF) ISSUED IN RELIANCE ON
EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SAID ACT AND SUCH LAWS. NEITHER
THIS  NOTE NOR THE  SECURITIES  ISSUABLE  UPON  CONVERSION  HEREOF  MAY BE SOLD,
TRANSFERRED,  PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF EXCEPT AS PERMITTED
UNDER SUCH SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.


                  NON-NEGOTIABLE 8% CONVERTIBLE PROMISSORY NOTE

$ 10,000                                                   Columbia, Maryland
June 24, 1997

         FOR VALUE RECEIVED,  the  undersigned,  Essex  Corporation,  a Virginia
corporation  (hereinafter  referred to as the "Maker" or the  "Company")  hereby
promises to pay Harold P. Hanson,  Trustee, Harold P. Hanson Trust (the "Payee")
at 2385 N.W.  18th  Place,  Gainesville,  FL 32605 or at such other place as the
holder hereof may from time to time  designate in writing,  the principal sum of
Ten  Thousand  and 00/100  Dollars  ($10,000)  in one  installment  due upon the
earlier of: (i) one (1) year from the date of issuance of the  promissory  note;
or (ii)  ten  (10)  business  days  after  the  date of  consummation  of  stock
acquisition/sale of substantially all of the assets or the merger of the Company
by or with an unrelated entity or business enterprise (the "Acquisition"), which
transaction  requires shareholder  approval.  Interest shall be paid by Maker to
the Payee on the  Maturity  Date at the simple  rate of eight (8%)  percent  per
annum  computed  on  the  unpaid  principal  balance.   By  acceptance  of  this
Non-Negotiable   8%  Convertible   Promissory  Note  (the  "Note"),   the  Payee
represents,  warrants, covenants and agrees that he, she or it will abide by and
be bound by its terms.

1. Prepayment,  Extension and Notices.  The unpaid principal balance outstanding
under this Note may be prepaid in part or in full by the Maker without  penalty,
upon  fifteen  (15) days notice to the Payee  stating the  repayment  amount and
repayment  date (the  "Repayment  Date").  The Maker must provide  notice of its
intention  to prepay  amounts  outstanding  hereunder at least five (5) business
days prior to the Maturity Date to the Payee.

2. Conversion.  The  unpaid  principal  amount of this Note and the  interest 
thereon, shall be convertible at the option of the Payee (the  "Conversion
Right") prior to the Maturity Date, in the manner and on the terms hereinafter
set forth, into shares of common stock of the Company, par value ($.10) at any 
time prior to the Maturity Date at a conversion  price equal to the greater of
market value on the date that the  election  to convert is made or fifty  cents
($.50) per shares, subject to adjustment pursuant to Section 4 hereof; provided 
however,  that in the event the assets of the  optoelectronics  division of the 
Company  have been transferred to another business


                                       1

<PAGE>



enterprise  [in  which  the  Company  has a  controlling  shareholder  interest]
("Transferee"), and at the election of the Payee, the unpaid principal amount of
this  Note  and the  accrued  interest  thereon,  shall  be  convertible  into a
percentage  equity  interest  of  the  Transferee  determined  pursuant  to  the
following formula:

                   x/y where x is the dollar amount  converted and y is the fair
                  market  value (or mean  fair  market  value,  if more than one
                  valuation  methodology  is utilized) as  determined by a third
                  party  expert in  providing  such  valuations  retained by the
                  Company..

         (b) Notice of the right to convert  shall be given  promptly  after the
date of Acquisition  and Maker shall have the period of time between such Notice
date and the Maturity  Date (but in no event less than ten (10)  business  days)
during which Payee shall have the  opportunity to elect to convert the principal
and interest into Newco Common Stock, or receive cash payment.

         (c)  Notwithstanding  any other provision of this Note to the contrary,
upon  receipt  of notice  of the  Maker's  intent  to prepay  part or all of the
principal  amount  hereunder or of an  Accelerated  Maturity Date, the Payee may
elect to exercise  the  Conversion  Right and convert a portion (as set forth in
subsection (a) hereof) of the amount of unpaid principal which the Maker intends
to  prepay,  up to the close of  business  on the last  business  day before the
stated Repayment Date.

         (d)  Notwithstanding  any other provision hereof,  the Conversion Right
may not be exercised at any time during which a registration statement under the
Securities Act of 1933 is filed but not effective  absent written consent of the
Company.

3. Conversion  Procedure.  The Conversion Right may be exercised by the Payee by
the surrender of this Note (along with the conversion form attached hereto, duly
executed) to the Maker at the principal office of the Maker.  Risk of loss prior
to  surrender  of this  Note  shall be borne by the  Payee.  Consequently,  hand
delivery with written  acknowledgement  of receipt by the Maker or registered or
certified  mail,  return receipt  requested,  is the preferred mode of delivery.
Conversion  shall be deemed to have been effected on the date when such delivery
of the conversion  notice is actually made or, if earlier,  at the expiration of
five (5) calendar  days after being sent to the Maker by the Payee by registered
or certified mail, return receipt requested,  with postage thereon fully prepaid
(the "Conversion Date"). As promptly as practicable thereafter,  the Maker shall
issue and  deliver  to the Payee:  (a) a new note  representing  the  difference
between the  principal  amount of this Note plus  interest  accrued  through the
Conversion  Date,  and the  principal  amount  hereof  which has been  converted
pursuant  hereto;  and (b)  certificates  representing  the  number of shares of
Common Stock to which the Payee is entitled. The Maker shall not be obligated to
issue certificates  representing shares of Common Stock in the name of any party
other  than the  Payee.  The  person or entity  in whose  name the  certificates
representing the shares of Common Stock issuable upon conversion hereof shall be
deemed to have become a holder of record on the next succeeding day on which the
transfer books are open, but the Conversion Price shall be that in effect on the
Conversion  Date. The Maker  covenants  that all securities  which may be issued
upon exercise


                                       2

<PAGE>



of the Conversion Right will, upon issuance, be fully paid and nonassessable and
free of all taxes, liens and charges caused or created by the Maker with respect
to the issuance thereof.

4. Adjustments. The Conversion Price and the number and kind of securities which
may be received upon  the exercise of the  Conversion Right shall be subject to
adjustment from time to time upon the happening of certain events, as follows:

         (a) Stock  Splits and  Combinations.  If the Maker shall at any time or
from time to time after the date hereof effect a subdivision of its  outstanding
shares of Common Stock, the Conversion Price then in effect  immediately  before
such subdivision  shall be  proportionately  decreased,  and conversely,  if the
Maker shall at any time or from time to time after the date  hereof  combine its
outstanding  shares  of  Common  Stock,  the  Conversion  Price  then in  effect
immediately  before such combination  shall be  proportionately  increased.  Any
adjustment  under this section shall become effective upon the close of business
on the date the subdivision or combination becomes effective.

         (b) Certain  Dividends and  Distributions.  In the event that the Maker
shall at any time or from time to time after the date hereof  make or issue,  or
fix a record  date for the  determination  of holders of shares of Common  Stock
entitled to  receive,  a dividend or other  distribution  payable in  additional
shares of Common Stock,  then and in each such event,  the Conversion Price then
in effect shall be  decreased  as of the time of such  issuance or, in the event
that such a record  date shall have been  fixed,  as of the close of business on
such  record  date,  by  multiplying  the  Conversion  Price then in effect by a
fraction:

                  (1) the numerator of which shall be the total number of shares
of Common Stock  issued and  outstanding  immediately  prior to the time of such
issuance or the close of business on such record date; and

                  (2) the  denominator  of which  shall be the sum of the  total
number of shares of Common Stock issued and outstanding immediately prior to the
time of such  issuance  or the close of  business  on such  record  date and the
number of shares of  Common  Stock  issuable  in  payment  of such  dividend  or
distribution;  provided, however, that if such record date shall have been fixed
and such dividend is not fully paid or if such distribution is not fully made on
the date fixed therefor, the Conversion Price shall be recomputed accordingly as
of the close of  business on such record  date and  thereafter  such  Conversion
Price shall be adjusted  pursuant  to this  subsection  as of the time of actual
payment of such dividends or distributions.

         (c) Other Dividends and  Distributions.  In the event that the Maker at
any time or from time to time after the date hereof shall make or issue,  or fix
a record  date for the  determination  of  holders  of shares  of  Common  Stock
entitled to receive, a dividend or other  distribution  payable in securities of
the  Maker  other  than  shares  of Common  Stock,  then and in each such  event
provisions  shall be made so that the  holder of this Note shall  receive,  upon
conversion  of this Note,  in addition  to the number of shares of Common  Stock
receivable  thereupon,  the amount of  securities of the Maker which such holder
would have received had its Note been  converted  into shares of Common Stock on
the date of such event and had  thereafter,  during the period  from the date of
such event to and including the Conversion Date,


                                       3

<PAGE>



retained such securities (together with any distributions payable thereon during
such period)  receivable by the holder as aforesaid  during such period,  giving
application to all adjustments  called for during such period under this section
with respect to the rights of the holder of the Note.

         (d) Reclassification, Exchange or Substitution. If the shares of Common
Stock  issuable upon the  conversion of this Note shall be changed into the same
or different number of shares of any class or classes of capital stock,  whether
by  capital   reorganization,   reclassification  or  otherwise  (other  than  a
subdivision or combination of shares or stock dividend  provided for above, or a
reorganization,  merger,  consolidation  or  sale  of  assets  provided  for  in
subsection  (e)  below),  then and in each such  event,  the holder of this Note
shall have the right thereafter to convert this Note into the kind and amount of
shares of capital stock and other  securities and property  receivable upon such
reorganization, reclassification or other change, as the holder of the number of
shares  of  Common  Stock  into  which  this  Note  might  have  been  converted
immediately  prior  to such  reorganization,  reclassification  or  change,  all
subject to further adjustment as provided herein.

         (e) Reorganization, Merger, Consolidation or Sale of Assets. If, at any
time or from time to time, there shall be a capital reorganization of the shares
of Common  Stock (other than a  subdivision,  combination,  reclassification  or
exchange  of shares  provided  for  elsewhere  in this  section)  or a merger or
consolidation of the Maker with or into another corporation,  or the sale of all
or substantially all of the Maker's properties and assets to any other person or
entity, then as a part of such  reorganization,  merger,  consolidation or sale,
provision  shall be made so that the  holder of this Note  shall  thereafter  be
entitled  to  receive  upon  conversion  of this  Note,  the number of shares of
capital stock or other  securities or property of the Maker, or of the successor
corporation  resulting from such merger or  consolidation  or sale, to which the
holder of shares of Common Stock  deliverable  upon  conversion  would have been
entitled on such  reorganization,  merger,  consolidation,  or sale. In any such
case,  appropriate adjustment shall be made in the application of the provisions
of this  section with respect to the rights of the holder of this Note after the
reorganization,  merger, consolidation or sale to the end that the provisions of
this section  (including  adjustment of the Conversion  Price then in effect and
the number of shares of Common Stock  receivable  upon  conversion of this Note)
shall be  applicable  after  that  event as nearly  equivalent  hereto as may be
practicable.

         (f) Material  Financing.  If the Corporation at an time during a twelve
(12) month period  commencing on the date of issuance of the Note, enters into a
transaction with a third party which is intended to provide  material  financing
to the Corporation,  and such transaction  includes rights of conversion similar
to those  granted in this Note,  then the  Conversion  Price  shall be  adjusted
downward to be equal to the Conversion Price granted to such third party.

         (g) Minimum  Adjustment.  Notwithstanding  anything to the contrary set
forth herein,  no adjustment of the Conversion  Price shall be made in an amount
equal to less than one cent  ($.01),  but any such  lesser  adjustment  shall be
carried  forward  and  shall  be made at the  time  and  together  with the next
subsequent  adjustment  which together with any  adjustments so carried  forward
shall amount to one cent ($.01) or more.



                                       4

<PAGE>



         (h)  Certificate of Adjustment.  Upon the occurrence of each adjustment
or readjustment of the applicable Conversion Price pursuant to this section, the
Maker shall promptly  compute such adjustment or readjustment in accordance with
the  terms  hereof  and  prepare  and  furnish  to the  holder  of  this  Note a
certificate,  signed by the  Chairman of the Board,  the  President or the Chief
Financial Officer,  setting forth such adjustment or readjustment and showing in
detail the facts upon which such adjustment or readjustment is based.

         (i)  Notices of Record Date.  If and in the event that:

                  (1) the  Maker  shall  set a record  date for the  purpose  of
entitling  the holders of shares of Common  Stock to receive a dividend,  or any
other distribution, payable otherwise than in cash;

                  (2) the  Maker  shall  set a record  date for the  purpose  of
entitling the holders of shares of Common Stock to subscribe for or purchase any
shares of any class or to receive any other rights;

                  (3) there shall occur any capital reorganization of the Maker,
reclassification  of the  shares of  capital  stock of the Maker  (other  than a
subdivision  or  combination  of  its  outstanding   shares  of  Common  Stock),
consolidation or merger of the Maker with or into another  corporation,  or sale
of all or substantially all of the assets of the Maker; or

                  (4) there shall occur a voluntary or involuntary dissolution,
liquidation, or winding up of the Maker;

then,  and in any such case, the Maker shall cause to be mailed to the holder of
record of this Note, at least [thirty (30) days] prior to the dates  hereinafter
specified,  a notice stating the date: (A) which has been set as the record date
for the purpose of such dividend,  distribution, or rights; or (B) on which such
reclassification,  reorganization,  consolidation,  merger,  sale,  dissolution,
liquidation  or winding up is to take place and the record  date as of which the
holder of record shall be entitled to exchange this Note for securities or other
property deliverable upon such reclassification,  reorganization, consolidation,
merger, sale, dissolution, liquidation or winding up.

5.  Reservation.  The Maker covenants  that,  during the period within which the
Conversion  Right may be exercised,  the Maker will at all times have authorized
and reserved for the purpose of issuance upon exercise of the Conversion  Right,
a sufficient  number of shares of Common Stock (or other  securities  subject to
the  Conversion  Right) to provide for the exercise of the  Conversion  Right in
full.

6. Fractional  Shares. No fractional shares of Common Stock shall be issued upon
conversion  of this Note.  In lieu of any  fractional  shares of Common Stock to
which the Payee would otherwise be entitled, the Maker shall pay an amount equal
to the  product of such  fraction  multiplied  by the fair value of one share of
Common Stock on the Conversion Date, as determined in good faith by the Board of
Directors of the Maker.



                                       5

<PAGE>



7. Registration Rights.  The Maker hereby covenants and agrees as follows:

         (a)      Definitions.  For purposes of this section:

                  (1) The  terms  "register,"  "registered"  and  "registration"
         refer to a registration effected by preparing and filing a registration
         statement or similar  document in compliance with the Securities Act of
         1933,  as  amended  (the  "Securities  Act"),  and the  declaration  of
         effectiveness of such  registration  statement or other document by the
         Securities and Exchange Commission (the "SEC").

                  (2) The term "Registrable Securities" means: (A) the shares of
         Common Stock issued or issuable  upon  conversion  of this Note; or (B)
         any other  securities  of the Maker  issued  as (or  issuable  upon the
         conversion or exercise of any warrant, right or other security which is
         issued  as) a  dividend  or other  distribution  with  respect  to,  in
         exchange for or in replacement of the shares of Common Stock referenced
         in subsection (A) immediately above,  excluding in all cases,  however,
         any   Registrable   Securities   sold  to  the  public  pursuant  to  a
         registration or an exemption from registration.

                  (3) The  number  of  shares of  "Registrable  Securities  then
         outstanding"  shall be the number of securities  outstanding  which are
         Registrable Securities.

                  (4) The term  "Holder" as used  hereinafter  in this Section 7
         means any person or entity owning of record Registrable Securities.

         (b) Piggy-Back  Registration Rights. In the event that (but without any
obligation to do so) the Maker proposes to register any of its securities  under
the Securities  Act in connection  with the public  offering of such  securities
solely for cash (other  than a  registration  on Form S-4,  Form S-8 or any form
which does not include  substantially  the same information as would be required
to be included in a registration  statement covering the sale of the Registrable
Securities),  the Maker shall  promptly give each Holder  written notice of such
registration (the "Piggy-Back Notice");  provided, however, that the Maker shall
have no  obligation  to so  notify  Holders  with  respect  to any  registration
subsequent  to the first of such  registrations  to occur after the  issuance of
this  Note and shall  have no  obligation  if such  registration  relates  to an
underwritten  offering by the Maker and the managing  underwriter of the subject
proposed offering expresses its objection thereto to the Maker. Upon the written
request of each  Holder  given  within  twenty  (20) days after  receipt of such
Piggy-Back Notice from the Maker, the Maker shall,  subject to the provisions of
Subsections  7(h)  and 7(m)  below,  cause to be  included  in the  registration
statement  filed by the Maker under the  Securities  Act all of the  Registrable
Securities  that each such  Holder has  requested  to be  registered;  provided,
however,  that the Maker  shall  have no such  obligation  if such  registration
statement  relates to an  underwritten  offering  by the Maker and the  managing
underwriter  of the subject  offering has expressed its objection to the same to
the Maker. To the extent that a Holder is offered the  opportunity  hereunder to
include all of its  Registrable  Securities in a  registration  statement,  such
Holder will be deemed to have exercised its sole piggy-back  registration  right
provided by this Subsection 7(c).



                                       6

<PAGE>



         (c) Obligations of the Maker.  Whenever the Maker shall elect to file a
registration statement to effect the registration of any Registrable Securities,
the Maker shall, as expeditiously as reasonably possible:

                  (1)  Prepare  and file with the SEC a  registration  statement
with respect to such  Registrable  Securities  and use its best efforts to cause
such registration  statement to become  effective,  and, upon the request of the
Holders of at least fifty percent (50%) of the Registrable Securities registered
thereunder,  keep such  registration  statement  effective for at least four (4)
months.

                  (2)  Prepare  and  file  with  the  SEC  such  amendments  and
supplements to such registration  statement and the prospectus  included therein
as may be necessary to comply with the  provisions  of the  Securities  Act with
respect  to the  disposition  of all  securities  covered  by such  registration
statement.

                  (3)  Furnish  to the  Holders  such  numbers  of  copies  of a
prospectus,   including  a  preliminary  prospectus,   in  conformity  with  the
requirements  of the  Securities  Act,  and  such  other  documents  as they may
reasonably  request  in order  to  facilitate  the  disposition  of  Registrable
Securities owned by them.

                  (4)  Use  its  best   efforts  to  register  and  qualify  the
securities  covered by such registration  statement under the securities laws of
such  jurisdictions  as shall be  reasonably  requested  by the  Holders for the
distribution of the securities covered by the registration  statement,  provided
that the Maker shall not be required in  connection  therewith or as a condition
thereto  to qualify to do  business  or to file a general  consent to service of
process in any such jurisdiction.

                  (5) In the event of any underwritten  public  offering,  enter
into and perform its  obligations  under an  underwriting  agreement  with terms
generally satisfactory to the managing underwriter of such offering.

                  (6) Notify the  Holders  promptly  after the Maker  shall have
received notice thereof,  of the time when the  registration  statement  becomes
effective or any supplement to any prospectus forming a part of the registration
statement has been filed.

                  (7)  Notify  the  Holders  of any stop  order  suspending  the
effectiveness of the registration  statement and use its reasonable best efforts
to remove such stop order.

         (d)  Furnish  Information.  It shall be a  condition  precedent  to the
obligations  of the Maker to take any  action  pursuant  hereto  that any Holder
seeking to include any of its Registrable Securities in a registration statement
filed by the Maker pursuant  hereto shall furnish to the Maker such  information
regarding itself, the Registrable Securities held by it, and the intended method
of  disposition  of  such   securities  as  shall  be  required  to  effect  the
registration of its Registrable Securities. In that connection, each such Holder
shall be required to represent to the Maker that all such  information  which is
given is both  complete  and  accurate in all  material  respects.  Each of such
Holders shall deliver to the Maker a statement in writing from



                                       7
<PAGE>



the beneficial  owners of such securities that such beneficial  owners bona fide
intend to sell, transfer or otherwise dispose of such securities.

         (e)      Definition of Expenses.

                  (1)  "Registration  Expenses" shall mean all expenses incurred
by the Maker in complying with Sections 7(c) and 7(d) hereof,  including without
limitation,  all  registration  and filing  fees,  printing  expenses,  fees and
disbursements  of counsel  for the Maker,  blue sky fees and  expenses,  and the
expense of any special audits  incident to or required by any such  registration
(but excluding the compensation of regular employees of the Maker which shall be
paid in any event by the Maker).

                  (2) "Selling Expenses" shall mean all underwriting  discounts,
selling commissions and underwriters'  expense allowance  applicable to the sale
and all fees and  disbursements  of any special  counsel (other than the Maker's
regular counsel) for any Holder.

         (f) Expenses of  Registration.  All Registration  Expenses  incurred in
connection with any registration, qualification or compliance herewith, shall be
borne by the Maker,  and all Selling  Expenses  shall be borne by the Holders of
the  securities so registered pro rata on the basis of the number of Registrable
Securities so registered.

         (g)  Underwriting  Requirements.  All Holders  proposing to  distribute
their  securities  through an underwriting  pursuant hereto shall (together with
the Maker and any other  holders  distributing  their  securities  through  such
underwriting)  enter into an  underwriting  agreement in customary form with the
underwriter   or   underwriters   selected  for   underwriting   by  the  Maker.
Notwithstanding  any other  provision  of this  section,  at the  request of the
managing underwriter,  the Holder shall delay the sale of Registrable Securities
which such Holder has requested be registered  under this section for the ninety
(90)  day  period  commencing  with  the  effective  date  of  the  registration
statement.  Notwithstanding anything to the contrary herein, no such delay shall
be required with respect to securities offered by holders of securities who have
requested  the  Maker  to  register  such  securities  pursuant  to a  mandatory
registration  obligation of the Maker if other security holders of the Maker who
have not made  requests  pursuant  to such an  obligation  are not  subject to a
similar delay. If any Holder  disapproves of the terms of any such underwriting,
he may  elect to  withdraw  therefrom  by  written  notice  to the Maker and the
underwriter.   Any  Registrable  Securities  excluded  or  withdrawn  from  such
underwriting  shall  not be  withdrawn  from  such  registration  except  at the
election of the Holder.

         (h) Delay of Registration.  No Holder shall have any right to obtain or
seek an injunction  restraining or otherwise  delaying any such  registration as
the  result  of  any   controversy   that  might  arise  with   respect  to  the
interpretation or implementation of this section.

         (i) Indemnification.  In the event that any Registrable Securities are
included in a registration statement pursuant hereto:

                  (1) To the extent  permitted by law, the Maker will  indemnify
         and hold harmless each Holder, the officers,  directors and partners of
         each Holder, any


                                       8

<PAGE>



         underwriter (as defined in the Securities Act) for such Holder and each
         person or entity,  if any,  that  controls  such Holder or  underwriter
         within the meaning of the Securities Act or the Securities Exchange Act
         of 1934, as amended (the "Exchange Act"),  against any losses,  claims,
         damages  or  liabilities  (joint or  several)  to which they may become
         subject under the Securities  Act, the Exchange Act or other federal or
         state law, insofar as such losses,  claims,  damages or liabilities (or
         actions in respect  thereof)  arise out of or are based upon any of the
         following   statements,   omissions  or  violations   (collectively   a
         "Violation"): (A) any untrue statement or alleged untrue statement of a
         material fact contained in such registration  statement,  including any
         preliminary  prospectus or final  prospectus  contained  therein or any
         amendments or supplements thereto; (B) the omission or alleged omission
         to state  therein a material  fact  required to be stated  therein,  or
         necessary to make the  statements  therein not  misleading;  or (C) any
         violation or alleged  violation by the Maker of the Securities Act, the
         Exchange  Act,  any  state  securities  law or any  rule or  regulation
         promulgated  under the  Securities  Act,  the Exchange Act or any state
         securities law; and the Maker will reimburse each such Holder, officer,
         director or partner, underwriter or controlling person for any legal or
         other  expenses   reasonably   incurred  by  them  in  connection  with
         investigating or defending any such loss, claim,  damage,  liability or
         action;  provided,  however,  that the indemnity agreement contained in
         this  subsection  shall not apply to amounts paid in  settlement of any
         such loss,  claim,  damage,  liability or action if such  settlement is
         effected  without the consent of the Maker (which  consent shall not be
         unreasonably withheld),  nor shall the Maker be liable in any such case
         for any such loss,  claim,  damage,  liability  or action to the extent
         that it arises  out of or is based  upon a  Violation  which  occurs in
         reliance  upon and in  conformity  with written  information  furnished
         expressly  for use in  connection  with such  registration  by any such
         Holder,  underwriter  or  controlling  person;  and  further  provided,
         however,  that the  foregoing  indemnity  agreement  is  subject to the
         condition that, insofar as it relates to any untrue statement,  alleged
         untrue statement,  omission or alleged omission made in any preliminary
         prospectus  but  eliminated or remedied in the  definitive  prospectus,
         such  indemnity  agreement  shall  not  inure  to  the  benefit  of the
         underwriter  (or the benefit of any person or entity that controls such
         underwriter),  if a copy of the  definitive  prospectus was not sent or
         given to such person or entity with or prior to the confirmation of the
         sale of such securities to such person or entity.

                  (2) To the extent  permitted by law, each selling  Holder will
         indemnify and hold harmless the Maker,  each of its directors,  each of
         its officers who have signed the registration  statement,  each person,
         if any, who controls the Maker within the meaning of the Securities Act
         or the  Exchange  Act,  any  underwriter  (within  the  meaning  of the
         Securities Act) for the Maker, any person who (or entity that) controls
         such  underwriter,  and any other  Holder  selling  securities  in such
         registration  statement  or any of its  directors  or  officers  or any
         person who controls such Holder, against any losses, claims, damages or
         liabilities (joint or several) to which the Maker or any such director,
         officer,  controlling person (or entity), or underwriter or controlling
         person, or other such Holder or director, officer or controlling person
         may become subject, under the Securities Act, the Exchange Act or other
         federal  or state  law,  insofar  as such  losses,  claims,  damages or
         liabilities  (or actions in respect  thereto) arise out of or are based
         upon any Violation, in each case to the extent (and only to the extent)
         that such Violation occurs in reliance


                                       9

<PAGE>



         upon and in  conformity  with  written  information  furnished  by such
         Holder expressly for use in connection with such registration; and each
         such  Holder  will  reimburse  any legal or other  expenses  reasonably
         incurred by the Maker or any such director, officer, controlling person
         (or entity),  underwriter  or  controlling  person (or  entity),  other
         Holder,  officer,  director or  controlling  person in connection  with
         investigating or defending any such loss, claim,  damage,  liability or
         action;  provided,  however,  that the indemnity agreement contained in
         this  subsection  shall not apply to amounts paid in  settlement of any
         such loss,  claim,  damage,  liability or action if such  settlement is
         effected without the consent of the Holder,  which consent shall not be
         unreasonably withheld.

                  (3) Promptly after receipt by an indemnified  party under this
         Section 7(i) of notice of the commencement of any action (including any
         governmental  action),  such  indemnified  party  will,  if a claim  in
         respect thereof is to be made against any indemnifying party under this
         Section  7(i),  notify  the  indemnifying   party  in  writing  of  the
         commencement thereof and the indemnifying party shall have the right to
         participate in, and, to the extent the  indemnifying  party so desires,
         jointly with any other indemnifying party similarly notified, to assume
         the defense thereof with counsel mutually  satisfactory to the parties;
         provided,  however,  that an indemnified  party shall have the right to
         retain its own  counsel,  with the fees and  expenses to be paid by the
         indemnifying  party, if representation of such indemnified party by the
         counsel retained by the indemnifying  party would be inappropriate  due
         to actual or potential  differing  interests  between such  indemnified
         party  and  any  other  party  represented  by  such  counsel  in  such
         proceeding.  The  failure  to notify  an  indemnifying  party  within a
         reasonable time of the  commencement of any such action,  to the extent
         prejudicial  to its ability to defend such action,  shall  relieve such
         indemnifying party of any liability to the indemnified party under this
         Section 7(i), but the omission so to notify the indemnifying party will
         not  relieve it of any  liability  that it may have to any  indemnified
         party otherwise than under this Section 7(i).

         (j) Reports Under  Securities  Exchange Act of 1934. With a view toward
making  available  to Holders  the  benefits of Rule 144  promulgated  under the
Securities  Act and any other rule or regulation of the SEC that may at any time
permit  a  Holder  to  sell  securities  of  the  Maker  to the  public  without
registration, the Maker agrees to:

                  (1) use its best efforts to  make and keep public information 
         available, as those terms are  understood  and defined in Rule 144, at
         all times;

                  (2) use its  best  efforts  to file  with  the SEC in a timely
         manner all reports and other documents  required of the Maker under the
         Securities Act and the Exchange Act; and

                  (3)  furnish to any  Holder,  so long as the  Holder  owns any
         Registrable Securities,  forthwith upon request such information as may
         be  reasonably  requested in order to allow any Holder to avail himself
         of any rule or  regulation  of the SEC which permits the selling of any
         such securities without registration.



                                       10

<PAGE>



         (k)  Termination of the Maker's Obligations.

                  (1) The Maker shall have no  obligation  pursuant to Section 7
with respect to any request made by any Holder  after the first  anniversary  of
the Maturity Date.

                  (2) Notwithstanding any provision hereof to the contrary,  the
Maker shall not be required to effect any registration  under the Securities Act
or under any state securities laws on behalf of any Holder or Holders if, in the
opinion of counsel  for the Maker,  the  offering  or transfer by such Holder or
Holders in the manner proposed  (including,  without  limitation,  the number of
shares  proposed  to be offered or  transferred  and the method of  offering  or
transfer) is exempt from the registration requirements of the Securities Act and
the securities laws of applicable states.

         (l) Lock Ups;  Limitation  on  Rights.  The Payee  (and any  subsequent
Holder) by acceptance hereof hereby agrees that, in the event that subsequent to
the date  hereof,  the Maker  conducts an  underwritten  public  offering of its
securities:  (i) the right to request  registration  pursuant to the  provisions
hereof  shall be subject  to the  approval  of the  underwriter  of such  public
offering;  and (ii) the Payee (and any subsequent Holder) shall agree to refrain
from exercising such rights or selling,  transferring or otherwise  disposing of
any of the  Registrable  Securities for a period of up to thirteen months should
the underwriter so request in writing.

8.       Miscellaneous.

         (a) Restricted Securities.  By acceptance hereof, the Payee understands
and  agrees  that  this  Note and the  shares  of  Common  Stock  issuable  upon
conversion hereof are "restricted  securities" under the federal securities laws
inasmuch  as they are  being  acquired  from  the  Maker  in a  transaction  not
involving a public offering and have not been the subject of registration  under
the  Securities  Act and that under such laws and  applicable  regulations  such
securities may be resold in the absence of registration under the Securities Act
only in certain limited circumstances.  The Payee hereby represents that he, she
or it is  familiar  with Rule 144  promulgated  under  the  Securities  Act,  as
presently in effect, and understands the resale limitations  imposed thereby and
by the Securities Act.

         (b) Further  Limitations  on  Disposition.   This  Note  may  not  be
negotiated, assigned  or transferred by Payee.  The Payee further agrees not to 
make any disposition of all  or any portion of  this Note (or of the securities
issuable upon conversion hereof) unless and until:

                  (1) there is then in effect a registration statement under the
         Securities Act covering such proposed  disposition and such disposition
         is made in accordance with such registration statement;

                  (2) such disposition is made in accordance with Rule 144 under
         the Securities Act; or

                  (3) the Payee  shall have notified  the Maker of the proposed
         disposition  and shall  have  furnished  the  Maker  with  a  detailed
         statement of the circumstances


                                       11

<PAGE>



         surrounding  the  proposed  disposition,   and  the  Payee  shall  have
         furnished  the Maker  with an  opinion  of  counsel,  which  opinion of
         counsel  shall be  reasonably  satisfactory  to the  Maker,  that  such
         disposition will not require  registration under the Securities Act and
         will be in compliance with applicable state securities laws.

         (c)  Legends.  It is  understood  that this  Note and each  certificate
evidencing shares of Common Stock issuable upon conversion hereof (or evidencing
any other  securities  issued with respect thereto  pursuant to any stock split,
stock  dividend,  merger or other form of  reorganization  or  recapitalization)
shall bear the legends (in addition to any legends  which may be required in the
opinion of the  Maker's  counsel by the  securities  laws of the state where the
Payee is located) substantially as set forth on the first page of this Note.

         (d) Presentment.  Except as set forth herein, Maker waives presentment,
demand and presentation for payment, notice of nonpayment and dishonor,  protest
and  notice of  protest  and  expressly  agrees  that  this Note or any  payment
hereunder  may be  extended  from time to time by the Payee  without  in any way
affecting the liability of Maker.

9.       Notices.

         (a) Notices to the Payee. Any notice required by the provisions of this
Note to be given to the holder  hereof  shall be in writing and may be delivered
by personal service,  facsimile transmission or by registered or certified mail,
return  receipt  requested,  with  postage  thereon  fully  prepaid or overnight
delivery  courier.  All such  communications  shall be addressed to the Payee of
record at its address  appearing on the books of the Maker.  Service of any such
communication  made only by mail shall be deemed  complete on the date of actual
delivery as shown by the addressee's registry or certification receipt or at the
expiration of the third (3rd) business day after the date of mailing,  whichever
is earlier in time.

         (b) Notices to the Maker.  Whenever any provision of this Note requires
a notice  to be given or a  request  to be made to the Maker by the Payee or the
holder  of any  other  security  of the  Maker  obtained  in  connection  with a
recapitalization,  merger, dividend or other event affecting this Note, then and
in each such case,  any such notice or request  shall be in writing and shall be
sent by registered or certified  mail,  return  receipt  requested  with postage
thereon fully prepaid to the Maker at its principal place of business.

         No notice given or request made hereunder  shall be valid unless signed
by the Payee of this Note or other holder  giving such notice or request (or, in
the case of a notice or request by Holders of a specified  percent in  aggregate
principal  amount of outstanding  Notes,  unless signed by each Holder of a Note
whose Note has been counted in  constituting  the requisite  percentage of Notes
required to give such notice or make such request).

10.      Events of Default.

         (a) Each of the  following  shall  constitute  an event of default  (an
"Event of Default") hereunder:  (i) the failure to pay when due any principal or
interest  hereunder and the  continuance  of such failure for a period of thirty
(30) days after written notice from the Payee


                                       12

<PAGE>



to the Maker of such failure; (ii) the violation by the Maker of any covenant or
agreement  contained in this Note and the  continuance  of such  violation for a
period of thirty (30) days after  written  notice from the Payee to the Maker of
such  failure;  (iii) any  change  in  control  of the Maker  which the Board of
Directors of the Maker deems to be hostile or  unfriendly;  (iv) the  assignment
for  the  benefit  of  creditors  by the  Maker;  (v)  the  application  for the
appointment  of a receiver or  liquidator  for the Maker or for  property of the
Maker;  (vi) the filing of a petition  in  bankruptcy  by or against  the Maker;
(vii) the issuance of an attachment or the entry of a judgment against the Maker
in excess of  $50,000;  (viii) a default by the Maker with  respect to any other
indebtedness  due to the  Payee;  (ix) the  making or  sending of a notice of an
intended  bulk  sale  by  the  Maker;  or  (x)  the  termination  of  existence,
dissolution  or  insolvency  of the  Maker.  Upon the  occurrence  of any of the
foregoing Events of Default,  this Note shall be considered to be in default and
the entire unpaid principal sum hereof, together with accrued interest, shall at
the option of the holder hereof become immediately due and payable in full. Upon
the occurrence of an Event of Default which remains  uncured as set forth herein
and the placement of this Note in the hands of an attorney for  collection,  the
Maker  agrees  to  pay  reasonable  collection  costs  and  expenses,  including
reasonable attorneys' fees and interest from the date of the default at the rate
of fifteen percent (15%) per annum computed on the unpaid principal balance.

         (b) The Payee may waive any Event of  Default  hereunder.  Such  waiver
shall be evidenced by written notice or other  document  specifying the Event or
Events  of  Default  being  waived  and  shall be  binding  on all  existing  or
subsequent Payees under this Note.

         (c)  Notwithstanding  anything  else to the contrary set forth  herein,
upon the  occurrence  of an Event of Default,  including  but not limited to the
failure to pay when due any  principal  or interest  hereunder,  the Maker shall
have six (6)  months  from  the date of the  occurrence  of each  such  Event of
Default to cure such  default,  during  which  time,  the Payee may not take any
action against the Maker with respect to collection  hereunder or enforcement of
the provisions hereof.

11. Survival.  In the event that all or a portion of the principal  hereunder is
converted pursuant to Section 3 above, Section 7 hereof relating to registration
rights  shall  survive the  termination  of this Note upon  cancellation  hereof
resulting from repayment of the balance of amounts outstanding  hereunder or the
issuance of a new note pursuant to Section 3 above.

12. Construction; Governing Law.  The validity and construction of this Note and
all matters pertaining hereto are to be determined  in accordance with  the laws
of  the State  of  Maryland  without regard to the  conflicts of law principles 
thereof.



                                       13


<PAGE>




         IN WITNESS WHEREOF,  Maker, by its appropriate  officers thereunto duly
authorized,  has  executed  this  convertible  promissory  note and  affixed its
corporate seal as of this 24th day of June, 1997.


                            ESSEX CORPORATION


                            By:  Joseph R. Kurry, Jr.
                            -------------------------
                                 Joseph R. Kurry, Jr., Chief Financial Officer


ATTEST:


By:   Sarah E. Roberts
- ----------------------
      Sarah E. Roberts, Assistant Secretary




                                       14


<PAGE>



                                 CONVERSION FORM

         The undersigned hereby elects to convert the following principal amount
of the attached  Non-Negotiable 8% Convertible Promissory Note (the "Note") (not
to exceed  $______) into shares (not to exceed  _______  shares) of Newco Common
Stock or Company  Common  Stock,  in  accordance  with the  formula set forth in
Section 2(a).


State such amount:     _____________________________________ ($___________).


Date:                                       Signature:


                            ------------------------------------------------
                            (Sign exactly as your name appears on the Note)







<TABLE> <S> <C>


<ARTICLE>                     5
                       
                      
<MULTIPLIER>                                   1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-28-1997
<PERIOD-START>                                 DEC-30-1996
<PERIOD-END>                                   JUN-29-1997
<CASH>                                           782
<SECURITIES>                                       0
<RECEIVABLES>                                    515
<ALLOWANCES>                                     (98)
<INVENTORY>                                      781
<CURRENT-ASSETS>                               2,050
<PP&E>                                         1,866
<DEPRECIATION>                                (1,530)
<TOTAL-ASSETS>                                 3,977
<CURRENT-LIABILITIES>                          2,653
<BONDS>                                        1,400
                            120
                                        0
<COMMON>                                         363
<OTHER-SE>                                     5,316
<TOTAL-LIABILITY-AND-EQUITY>                   3,977
<SALES>                                        2,064
<TOTAL-REVENUES>                               2,064
<CGS>                                          1,392
<TOTAL-COSTS>                                  2,832
<OTHER-EXPENSES>                                   0
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                               117
<INCOME-PRETAX>                                 (885)
<INCOME-TAX>                                       0
<INCOME-CONTINUING>                             (885)
<DISCONTINUED>                                  (101)
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                    (986)
<EPS-PRIMARY>                                   (.27)
<EPS-DILUTED>                                   (.27)
        


</TABLE>


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