DRESSER INDUSTRIES, INC.
                             (Issuer and Guarantor)

                                       AND

                    TEXAS COMMERCE BANK NATIONAL ASSOCIATION
                                    (Trustee)







                          Second Supplemental Indenture

                          Dated as of October 30, 1997











                       8% Guaranteed Senior Notes due 2003






         SECOND  SUPPLEMENTAL  INDENTURE  dated as of October 30,  1997,  by and
between DRESSER INDUSTRIES,  INC. ("Successor"),  a corporation incorporated and
existing  under  the laws of the  State of  Delaware  and  TEXAS  COMMERCE  BANK
NATIONAL ASSOCIATION, (the "Trustee"), a national banking association.

RECITALS

A. Baroid Corporation (the "Company"),  a corporation  incorporated and existing
under the laws of the State of Delaware,  has heretofore  executed and delivered
to the Trustee a certain  Indenture  dated as of April 22, 1993, as supplemented
as of  August 4,  1994,  (the  Indenture,  as  supplemented  herein  called  the
"Indenture")  providing for the issue of $150,000,000 principal amount of its 8%
Guaranteed  Senior  Notes due 2003 (the  "Securities").  All terms  used in this
Second Supplemental Indenture which are defined in the Indenture and not defined
herein shall have the same meanings assigned to them in the Indenture.

B.  Pursuant  to the  Certificate  and  Articles  of  Dissolution  and  Plan  of
Dissolution dated as of October 30, 1997, by the Company and the Successor,  the
Company was dissolved  and its assets  distributed  to Successor,  and Successor
assumed  all the  Company's  liabilities  and  obligations  as of that date (the
"Dissolution") pursuant to the laws of Delaware.

C. Section  4.01 of the  Indenture  provides  that in the event that the Company
shall sell, assign,  transfer or lease all or substantially all of its assets to
a  successor   company,   the  successor   company  shall  expressly  assume  by
supplemental  indenture all the  obligations of the Company under the Securities
and the Indenture.

D. Section 8.01 of the Indenture  provides that a supplemental  indenture may be
entered  into by the Company and the Trustee  without the consent of any Holders
to comply with Article 4.

E. The Company has furnished the Trustee with an Officers'  Certificate  stating
that the Dissolution and this Second Supplemental  Indenture comply with clauses
(1) through (3) of Article 4 of the Indenture.

                                    AGREEMENT

         NOW THEREFORE,  for and in consideration of the foregoing premises, the
parties hereto do hereby mutually covenant and agree as follows:

         SECTION 1. The Successor hereby expressly  assumes,  from and after the
consummation  of the  Dissolution,  all the  obligations  and liabilities of the
Company under the Securities and the Indenture.




         SECTION 2. The Successor shall,  from and after the consummation of the
Dissolution,  by virtue of the  aforesaid  assumption  and the  delivery of this
Second  Supplemental  Indenture,  succeed to, and be  substituted  for,  and may
exercise every right and power of, the Company under the Indenture with the same
effect as if the Successor had been named as the Company in the Indenture.

         SECTION 3. Pursuant  to Section 9.02 of the  Indenture,  any  notice or
communication  provided or permitted by the  Indenture to be made upon, given or
furnished   to, or  filed  with  the  Company  shall  be  addressed  to  Dresser
Industries, Inc. at P.O. Box 718, Dallas, Texas 75221, Attention:  Treasurer.

         SECTION 4. In case any provision in this Second Supplemental  Indenture
shall be  invalid,  illegal  or  unenforeceable,  the  validity,  legality,  and
enforceability  of the remaining  provisions shall not in any way be affected or
impaired hereby.

         SECTION 5. This Second Supplemental Indenture supplements the Indenture
and shall be a part and subject to all the terms thereof. Except as supplemented
hereby, the Indenture shall continue in full force and effect.

         SECTION 6. This Second  Supplemental  Indenture  shall be  construed in
accordance with and governed by the laws of the State of New York.

         SECTION 7. This Second Supplemental Indenture may be executed in one or
more  counterparts  each of which shall be deemed to be an original,  but all of
which together shall constitute one and the same instruments.

         IN  WITNESS  WHEREOF,  the  parties  hereto  have  caused  this  Second
Supplemental Indenture to be duly executed as of the 30th day of October, 1997.

                                  DRESSER INDUSTRIES, INC.
Attest:
                                    /s/ George H. Juetten
                                  --------------------------------
  /s/ Rebecca R. Morris           By:   George H. Juetten
- -------------------------               Senior Vice President and
Secretary                               Chief Financial Officer


                                  TEXAS COMMERCE BANK NATIONAL ASSOCIATION

                                    /s/ Letha Glover
                                  --------------------------------
                                  By:   Letha Glover
                                        Assistant Vice President and
                                        Trust Officer