EXHIBIT 4.1i





























<PAGE>

                                  May 26, 2000


Emanuel N. Logothetis, Chairman
Joule, Inc.
1245 Route 1 South
Edison, New Jersey 08837

         Re:      Summit Bank (the "Lender") to
                  Joule, Inc. (the "Borrower")

Dear Mr. Logothetis:

     Reference  is made to a certain  Loan and  Security  Agreement  dated as of
February 20, 1991, as amended from time to time (the "Loan  Agreement"),  by and
between  the  Borrower  and the Lender.  All  capitalized  terms  used,  but not
specifically  defined herein,  shall have the meaning provided for such terms in
the Loan Agreement.

     The  Borrower  has  requested  and the  Lender  has  agreed to  extend  the
Termination  Date in the Loan  Agreement  as set forth  herein.  Therefore,  the
parties agree as follows:

     1.  As of the  date  hereof,  Article  I,  Section  1.1  (ll)  of the  Loan
Agreement, is hereby amended and modified to read as follows:

     (ll) "Termination Date" shall mean May 31, 2001.

     2. In furtherance  of the foregoing,  any and all references to a "maturity
date" or to the date on which the Loan  matures  and/or  expires  in any and all
Loan  Documents is hereby  amended and modified to delete the existing  maturity
date of "May 31, 2000" and insert a new maturity date of "May 31, 2001" in their
place and stead.

     3. The Borrower and Corporate  Guarantors  hereby agree with,  reaffirm and
acknowledge the representations and warranties  contained in the Loan Agreement,
Corporate  Guaranty  Agreements and any and all amendments and/or  modifications
thereto.  Furthermore,  the Borrower and Corporate Guarantors represent that the
representations  and  warranties  contained  in the  Loan  Agreement,  Corporate
Guaranty  Agreements and any and all  amendments  and/or  modifications  thereto
continue  to be true  and in full  force  and  effect.  All  Obligations  of the
Borrower to the Lender are due without any offset,  defenses,  counterclaims  or
recoupment whatsoever.

     4. All other terms and  conditions  of the Loan  Agreement  and any and all
amendments and/or modifications  thereto, and any and all exhibits and schedules
annexed  thereto and all other writings  submitted by the Borrower to the Lender
pursuant thereto, shall remain unchanged and in full force and effect.


<PAGE>


Emanuel N. Logothetis, Chairman
Joule, Inc.
May 26, 2000
Page 2

     5. This letter  amendment  shall not constitute a waiver or modification of
any of the  Lender's  rights and  remedies  or of any of the terms,  conditions,
warranties, representations or covenants contained in the Loan Agreement and any
and all amendments  and/or  modifications  thereto,  except as specifically  set
forth  above,  and the Lender  hereby  reserves  all of its rights and  remedies
pursuant to the Loan Agreement and any and all amendments  and/or  modifications
thereto and applicable law.

     6. This letter  amendment  may be  executed in any number of  counterparts,
each of which, when taken together, shall be deemed one and the same instrument.

     Kindly indicate the agreement of the Borrower and Corporate Guarantors with
the terms and conditions of this letter amendment by countersigning in the space
provided below,  and returning a countersigned  copy of this letter amendment to
the  undersigned.  This  letter  amendment  shall  become null and void unless a
countersigned copy is returned within fourteen (14) days from the date hereof.


                                           Very truly yours,

                                           SUMMIT BANK


                                           By:      Cynthia Colucci
                                                    ---------------------
                                                    Cynthia Colucci,
                                                    Vice President


Accepted and agreed as of this
thirty first day of May, 2000:



BORROWER:

JOULE, INC.



By:   Emanuel Logothetis
      ------------------------------
      Name:    Emanuel Logothetis
      Title:   Chairman of the Board


<PAGE>


Emanuel N. Logothetis, Chairman
Joule, Inc.
May 26, 2000
Page 3

CORPORATE GUARANTORS:

JOULE MAINTENANCE CORPORATION,
a New Jersey corporation


By:   Emanuel Logothetis
      ------------------------------
      Name:    Emanuel Logothetis
      Title:   Chairman of the Board



JOULE TECHNICAL SERVICES, INC.,
a New Jersey corporation


By:   Emanuel Logothetis
      ------------------------------
      Name:    Emanuel Logothetis
      Title:   Chairman of the Board




JOULE TECHNICAL STAFFING, INC.,
a New Jersey corporation


By:   Emanuel Logothetis
      ------------------------------
      Name:    Emanuel Logothetis
      Title:   Chairman of the Board