Exhibit No. 4(d)





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                       ARMSTRONG WORLD INDUSTRIES, INC,

                                      and

                      THE FIRST NATIONAL BANK OF CHICAGO

                                    Trustee

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

                          SUPPLEMENTAL INDENTURE     

                         Dated as of October 19, 1990

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


             Supplemental to Indenture Dated as of March 15, 1988

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    SUPPLEMENTAL INDENTURE, dated as of October 19, 1990 (this "Supplement 
Indenture"), between ARMSTRONG WORLD INDUSTRIES, INC., a corporation duly 
organized and existing under the laws of the Commonwealth of Pennsylvania (the 
"Company"), party of the first part, and THE FIRST NATIONAL BANK OF CHICAGO, a 
national banking association duly organized and existing under the laws of the 
United States of America, as Trustee (the "Trustee") under the Indenture 
hereinafter referred to, party of the second part.

    

                                  WITNESSETH:


    WHEREAS, the Company has heretofore executed and delivered to Morgan
Guaranty Trust Company of New York, as predecessor trustee, an indenture dated
as of March 15, 1988 (the "Indenture"), to provide for the issuance from time to
time of the Company's debt securities (the "Securities") and has heretofore
issued $125,000,000 aggregate principal amount of its 9-3/4% Debentures Due
2008;

    WHEREAS, Section 901 of the Indenture provides, among other things, that the
Indenture may be amended and supplemented without the consent of the holders of 
any of the Securities to add to or change any of the provisions of the Indenture
to such extent as shall be necessary to permit or facilitate the issuance of 
Securities in bearer form; and 

    WHEREAS, all things necessary to constitute this Supplemental Indenture a 
valid and binding agreement of the Company have been done and performed;

 
          NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH:

                                  ARTICLE ONE
                                  -----------

                                  AMENDMENTS
                                  ----------

          Section 101. Section 101 of the Indenture is hereby amended by adding

the following definition:

          "'Depositary' means with respect to the Securities of any series
       issuable or issued in whole or in part in global form, the Person
       designated as Depositary by the Company pursuant to Section 301 until a
       successor Depositary shall have become such pursuant to the applicable
       provisions of this Indenture, and thereafter "Depositary" shall mean or
       include each Person who is then a Depositary hereunder, and if at any
       time there is more than one such Person, "Depositary" as used with
       respect to the Securities of any such series shall mean the "Depositary"
       with respect to the Securities of that series."

          Section 102. Article Two of the Indenture is hereby amended by adding 

the following as a new Section 202 and redesignating the Old Section 202 as 

Section 203:

          "Section 202. Securities in Global Form. If Securities of a series are
                        -------------------------
     issuable in whole or in part in global form, any such Security may provide
     that it shall represent the aggregate amount of Outstanding Securities from
     time to time endorsed thereon and may also provide that the aggregate
     amount of Outstanding Securities represented thereby may from time to time
     be reduced to reflect exchanges or increased to reflect the issuance of
     additional securities. Any endorsement of a Security in global form to
     reflect the amount, or any increase or decrease in the amount, of
     Outstanding Securities represented thereby shall be made in such manner and
     by such Person or Persons, as shall be specified therein or in Company
     Order delivered to the Trustee pursuant to Section 303."

          Section 103. Section 301 of the Indenture is hereby amended by adding 

the following as new subparagraph

                                       2


 
(16) and redesignating old subparagraphs (16) and (17) as subparagraphs (17) and
(18), respectively:

          "(16) the issuance of the Securities of such series in whole or in
     part in global form and, if so, the identity of the Depositary for such
     Securities in global form, and the terms and conditions, if any, upon which
     interests in such Securities in global form may be exchanged, in whole or
     in part, for the individual Securities represented thereby;"

          Section 104.  Section 303 of the Indenture is hereby deleted and
replaced in its entirety by the following:

          "SECTION 303.  Execution, Authentication, Delivery and Dating.
                         ---------------------------------------------- 
     The Securities shall be executed on behalf of the Company by its Chairman
     of the Board, its President, one of its Vice Presidents or its Treasurer,
     and by its Secretary or one of its Assistant Secretaries or one of its
     Assistant Treasurers, under its corporate seal or a facsimile thereof
     reproduced thereon attested by its Secretary or one of its Assistant
     Secretaries. The signature of any of these officers on the Securities may
     be manual or facsimile.

          Securities bearing the manual or facsimile signatures of individuals
     who were at any time the proper officers of the Company shall bind the
     Company, notwithstanding that such individuals or any of them have ceased
     to hold such offices prior to the authentication and delivery of such
     Securities or did not hold such offices at the date of such Securities.

          At any time and from time to time after the execution and delivery of
     this Indenture, the Company may deliver Securities of any series executed
     by the Company to the Trustee for authentication, together with a Company
     Order for the authentication and delivery of the Securities of such series
     or procedures acceptable to the Trustee set forth in the Company Order, and
     the Trustee in accordance with the Company Order or such procedures shall
     either at one time or from time to time pursuant to such instructions as
     may be described therein authenticate and deliver the Securities of such
     series. The maturity date, original issue date, interest rate and other
     terms of such Securities may be determined by or pursuant to such Company
     Order and procedures. If provided for in such procedures, such Company
     Order may authorize

                                       3

 
authentication and delivery pursuant to oral instructions from the Company or 
its duly authorized agent, which instructions shall be promptly confirmed in 
writing.  In authenticating the Securities of such series and accepting the 
additional responsibilities under this Indenture in relation to the Securities 
of such series, the Trustee shall be entitled to receive, and (subject to 
Section 601) shall be fully protected in relying upon:

          (1)  an Officers' Certificate complying with Section 102 and stating 
to the best knowledge of the signers of such certificate that no Event of 
Default with respect to any series of Securities shall have occurred and be
continuing; and

          (2)  an Opinion of Counsel complying with Section 102 and stating:

               (a)  the form of Securities of such series have been established 
          in conformity with the provisions of this Indenture;

               (b)  the terms of the Securities of such series have been
          established (or, when determined in the manner described in such
          opinion, will have been established) in conformity with the provisions
          of this Indenture; and

               (c)  that the Securities of such series, when authenticated and
          delivered by the Trustee and issued by the Company in the manner and
          subject to any conditions specified in such Opinion of Counsel, will
          constitute valid and legally binding obligations of the Company,
          enforceable in accordance with their terms, subject to bankruptcy,
          insolvency, reorganization and other laws of general applicability
          relating to or affecting the enforcement of creditors' rights and to
          general equity principles.

     The Trustee shall have the right to decline to authenticate and 
deliver the Securities of such series if the Trustee, being advised by counsel, 
determines that such action may not lawfully be taken, would expose the Trustee 
to personal liability to existing Holders or would add to the obligations and 
duties of the Trustee hereunder in any material respect.

     Each Security shall be dated the date of its authentication.

 
     If the Company shall establish pursuant to Section 301 that Securities of a
series may be issued in whole or in part in global form, then the Company shall
execute and the Trustee shall, in accordance with this Section and the Company
Order with respect to such series, authenticate and deliver one or more
Securities in global form that (i) shall represent and shall be denominated in
an aggregate amount equal to the aggregate principal amount of the Outstanding
Securities of such series and tenor to be represented by one or more Securities
in global form, (ii) shall be registered, in the name of the Depositary for such
Security or Securities in global form or the nominee of such Depositary, (iii)
shall be delivered to such Depositary or pursuant to such Depositary's
instruction, and (iv) shall bear a legend substantially to the following effect:
"Unless and until it is exchanged in whole or in part for Bonds in definitive
form, this Bond may not be transferred except as a whole by the Depositary to a
nominee of the Depositary, or by a nominee of the Depositary, or by the
Depositary or any such nominee to a successor Depositary or a nominee of such
Depositary. Unless this certificate is presented by an authorized representative
of The Depository Trust Company (55 Water Street, New York, New York) to the
issuer or its agent for registration of transfer, exchange or payment, and any
certificate issued is registered in the name of Cede & Co. or such other name as
requested by an authorized representative of The Depository Trust Company and
any payment is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR
VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL since the registered owner
hereof, Cede & Co., has an interest herein." Each Depositary designated pursuant
to Section 301 for a Security in global form must, at the time of its
designation and at all times while it serves as Depositary, be a clearing agency
registered under the Securities Exchange Act of 1934 and any other applicable
statute or regulation.

     No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such Security
has been duly authenticated and delivered hereunder and is entitled to the
benefits of this Indenture."

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          Section 105. Section 304 of the Indenture is hereby deleted and 
replaced in its entirety by the following:

          "SECTION 304. Temporary Securities. Pending the preparation of 
                        --------------------
     definitive Securities of any series, the Company may execute, and upon
     compliance with Section 303 the Trustee shall authenticate and deliver,
     temporary Securities of such series which are printed, lithographed,
     typewritten, mimeographed or otherwise produced, in any authorized
     denomination, substantially of the tenor of the definitive Securities in
     lieu of which they are issued and with such appropriate insertions,
     omissions, substitutions and other variations as the officers executing
     such Securities may determine, as evidenced by their execution of such
     Securities. In the case of Securities of any series, such temporary
     Securities may be in global form, representing all of the Outstanding
     Securities of such series and tenor.

          Except in the case of temporary Securities in global form which shall
     be exchanged in accordance with the provisions thereof, if temporary
     Securities of any series are issued, the Company will cause definitive
     Securities of that series to be prepared without unreasonable delay. After
     the preparation of definitive Securities of such series, the temporary
     Securities of such series shall be exchangeable for definitive Securities
     of such series upon surrender of the temporary Securities of such series at
     the office or agency of the Company in a Place of Payment for that series,
     without charge to the Holder. Upon surrender for cancellation of any one or
     more temporary Securities of any series the Company shall execute and the
     Trustee shall authenticate and deliver in exchange therefor a like
     principal amount of definitive Securities of the same series of authorized
     denominations. Such exchange shall be made by the Company at its expense
     and without any charge therefor. Unless otherwise specified as contemplated
     by Section 301 with respect to a temporary Security in global form, until
     so exchanged the temporary Securities of any series shall in all respects
     be entitled to the same benefits under this Indenture as definitive
     Securities of such series."

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     Section 106. Section 305 of the Indenture is hereby deleted and replaced in
its entirety by the following:

    "SECTION 305. Registration; Registration of Transfer and Exchange. The 
                  ----------------------------------------------------
Company shall cause to be kept for each series of Securities at one of the
offices or agencies maintained pursuant to Section 1002 a register (the register
maintained in such office and in any other office or agency of the Company in a
Place of Payment being herein sometimes collectively referred to as the
"Security Register") in which, subject to such reasonable regulations as it may
prescribe, the Company shall provide for the registration of such Securities and
of transfers of such Securities. Such office or agency is hereby appointed
"Security Registrar" for the purpose of registering Securities and transfers of
Securities as herein provided.

     Upon surrender for registration of transfer of any Security of any series
at the office or agency in a Place of Payment for that series, the Company shall
execute, and the Trustee shall authenticate and deliver, in the name of the
designated transferee or transferees, one or more new Securities of the same
series and of like tenor, of any authorized denominations and of a like
aggregate principal amount and Stated Maturity.

     In no case shall there be more than one Security Register for a series of 
Securities.

     Notwithstanding any other provision of this Section, unless and until it is
exchanged in whole or in part for the individual Securities represented thereby,
in definitive form, a Security in global form representing all or a portion of 
the Securities of a series may not be transferred except as a whole by the 
Depositary for such series to a nominee of such Depositary or by a nominee of 
such Depositary to such Depositary or another nominee of such Depositary or by 
such Depositary or any such nominee to a successor Depositary for such series or
a nominee of such successor Depositary.

     At the option of the Holder, Securities of any series may be exchanged for
other Securities of the same series and of like tenor, of any authorized
denominations and of a like aggregate principal amount and Stated Maturity, upon
surrender of the Securities to be exchanged at such office or agency. Whenever
any

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Securities are so surrendered for exchange, the Company shall execute, and the 
Trustee shall authenticate and deliver, the Securities which the Holder making 
the exchange is entitled to receive.

     If at any time the Depositary for the Securities of a series represented by
one or more Securities in global form notifies the Company that it is unwilling
or unable to continue as Depositary for the Securities of such series or if at
any time the Depositary for the Securities of such series shall no longer be
eligible under Section 303, the Company, by Company Order, shall appoint a
successor Depositary with respect to the Securities of such series. If a
successor Depositary for the Securities of such series is not appointed by the
Company within 90 days after the Company receives such notice or becomes aware
of such ineligibility, the Company's election pursuant to Section 301 that such
Securities be represented by one or more Securities in global form shall no
longer by effective with respect to the Securities of such series and the
Company will execute, and the Trustee, upon receipt of a Company Order for the
authentication and delivery of definitive Securities of such series, will
authenticate and deliver, Securities of such series in definitive form, in
authorized denominations, in an aggregate principal amount and like terms and
tenor equal to the principal amount of the Security or Securities in global form
representing such series in exchange for such Security or Securities in global
form.
    
     The Company may at any time and in its sole discretion determine that
individual Securities of any series issued in global form shall no longer be
represented by such Security or Securities in global form. In such event the
Company will execute, and the Trustee, upon receipt of a Company Order for the
authentication and delivery of definitive Securities of such series and of the
same terms and tenor, will authenticate and deliver Securities of such series in
definitive form, in authorized denominations, and in aggregate principal amount
equal to the principal amount of the Security or Securities in global form
representing such series in exchange for such Security or Securities in global
form.

     If specified by the Company pursuant to Section 301 with respect to a
series of Securities issued in global form, the Depositary for such series of
Securities may surrender a Security in global form for such series of Securities
in exchange in whole or in part for Securities of such series in definitive form
and of like terms and tenor on such terms as are

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acceptable to the Company and such Depositary. Thereupon, the Company shall 
execute, and the Trustee upon receipt of a Company Order for the authentication 
and delivery of definitive Securities of such series, shall authenticate and 
deliver, without service charge:

          (a) to each Person specified by such Depositary a new definitive
     Security or Securities of the same series and of the same tenor, in
     authorized denominations, in aggregate principal amount equal to and in
     exchange for such Person's beneficial interest in the Security in global
     form; and

          (b) to such Depositary a new Security in global form in a denomination
     equal to the difference, if any, between the principal amount of the
     surrendered Security in global form and the aggregate principal amount of
     the definitive Securities delivered to Holders pursuant to clause (a)
     above.

     Upon the exchange of a Security in global form for Securities in definitive
form, such Security in global form shall be cancelled by the Trustee or an agent
of the Company or the Trustee. Securities issued in definitive form in exchange
for a Security in global form pursuant to this Section 305 shall be registered
in such names and in such authorized denominations as the Depositary for such
Security in global form, pursuant to instructions from its direct or indirect
participants or otherwise, shall instruct the Trustee or an agent of the Company
or the Trustee in writing. The Trustee or such agent shall deliver such
Securities to or as directed by the Persons in whose names such Securities are
so registered or to the Depositary.

     Whenever any securities are so surrendered for exchange, the Company shall 
execute, and the Trustee shall authenticate and deliver, the Securities which 
the Holder making the exchange is entitled to receive.

     All Securities issued upon any registration of transfer or exchange of 
Securities shall be the valid obligations of the Company, evidencing the same 
debt, and entitled to the same benefits under this Indenture, as the Securities 
surrendered upon such registration of transfer or exchange.

     Every Security presented or surrendered for registration of transfer or for
exchange shall (if so required by the Company or the Trustee) be duly endorsed, 
or be accompanied by a written instrument of

                                       9


     transfer in form satisfactory to the Company and the Security Registrar
     duly executed by the Holder thereof or his attorney duly authorized in
     writing.

          No service charge shall be made for any registration of transfer or
     exchange of Securities, but the Company may require payment of a sum
     sufficient to cover any tax or other governmental charge that may be
     imposed in connection with any registration of transfer or exchange of
     Securities, other than exchanges pursuant to Section 304, 906 or 1107 not
     involving any transfer.

          The Company shall not be required (i) to issue, register the transfer
     of or exchange Securities of any series during a period beginning at the
     opening of business 15 days before the day of selection of Securities of
     such series to be redeemed and ending at the close of business on the day
     of the mailing of a notice of redemption of Securities of such series so
     elected for redemption, or (ii) to register the transfer of or exchange any
     Security selected for redemption in whole or in part, except the unredeemed
     portion of any Security being redeemed in part."

          Section 107. Section 308 of the Indenture is hereby amended by adding
the following paragraph at the end of such Section:

          "None of the Company, the Trustee, any Authenticating Agent, any
     Paying Agent, or the Security Registrar will have any responsibility or
     liability for any aspect of the records relating to or payments made on
     account of beneficial ownership interests of a Security in global form or
     for maintaining, supervising or reviewing any records relating to such
     beneficial ownership interests and each of them may act or refrain from
     acting without liability on any information relating to such records
     provided by the Depositary."

          Section 108. Section 902 of the Indenture is hereby amended by adding
the following paragraph at the end of such Section:

          "The Company may set a record date for purposes of determining the
     identity of the Holders entitled to give a written consent or waive
     compliance by the Company as authorized or permitted by this Section.

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     Such record date shall be not more than 30 days prior to the first  
     solicitation of such consent or waiver or the date of the most 
     recent list of holders furnished to the Trustee pursuant to Section
     312 of the Trust Indenture Act."

                                  ARTICLE TWO
                                  -----------

                                 MISCELLANEOUS

          Section 201. Execution of Supplemental Indenture; Construction.  This 
                       -------------------------------------------------   
Supplemental Indenture is executed and shall be construed as an indenture 
supplemental to the Indenture and, as provided in the Indenture, this 
Supplemental Indenture forms a part thereof. The Indenture, as supplemented by 
this Supplemental Indenture, is in all respects ratified and confirmed, and the 
Indenture and this Supplemental Indenture shall be read, taken and construed as 
one and the same instrument.


          Section 202. Effect of Headings. The Article and Section headings 
                       ------------------         
herein are for convenience only and shall not affect the construction hereof.

          Section 203. Successors and Assigns.  All covenants and agreements in 
                       ----------------------
this Supplemental Indenture by the Company shall bind its successors and 
assigns, whether so expressed or not.

          Section 204. Separability Clause.  In case any provision in this 
                       -------------------
Supplemental Indenture shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be 
affected or impaired thereby.

                                      11

 
     Section 205. Benefits of Supplemental Indenture. Nothing in this
                  ----------------------------------
Supplemental Indenture, express or implied, shall give to any person, other than
the parties hereto, their successors hereunder and the holders of Securities,
any benefit or any legal or equitable right, remedy or claim under this
Supplemental Indenture.

     Section 206. Recitals of the Company. The Trustee shall not be responsible
                  -----------------------
in any manner whatsoever for the correctness of the recitals herein contained,
all of which are made by the Company.

     Section 207. Defined Terms. Terms used in this Supplemental Indenture which
                  -------------
are defined in the Indenture and not otherwise defined herein shall have the
meanings set forth in the Indenture.

     Section 208. Governing Law. This Supplemental Indenture shall be deemed to
                  -------------
be a contract made under the laws of the State of New York, and for all purposes
shall be construed in accordance with the laws of said State.

     Section 209. Execution and Counterparts. This Supplemental Indenture may be
                  --------------------------
executed in any number of counterparts, each of which shall be deemed to be an
original, but all such counterparts shall together constitute but one and the
same instrument.

     The First National Bank of Chicago, the party of the second part, hereby 
accepts the trusts in this Supplemental Indenture declared and provided, upon 
the terms

                                      12

 
and conditions set hereinbefore set forth and set forth in the Indenture.

          IN WITNESS WHEREOF, ARMSTRONG WORLD INDUSTRIES, INC., the party of the
first part, has caused this Supplemental Indenture to be signed and acknowledged
by one of its officers thereunto duly authorized, and its corporate seal to be 
affixed hereunto, and the same to be attested by the signature of its Secretary 
or one of its Assistant Secretaries; and THE FIRST NATIONAL BANK OF CHICAGO, the
party of the second part, as Trustee, has caused this Supplemental Indenture to 
be signed and acknowledged by one of its Vice Presidents, and its corporate seal
to be affixed hereto, and the same to be attested by the signature of one of its
Trust Officers, all as of October 19, 1990.

                                         ARMSTRONG WORLD INDUSTRIES, INC.


                                         By: /s/ E. A. Deaver
                                             ---------------------------------
                                             Name: E. A. Deaver
                                             Title: Executive Vice-President

Attest:

By: /s/ J. H. Miller, Jr.
    ----------------------------
    J. H. Miller, Jr., Asst. Secretary
[Corporate Seal]

                                         THE FIRST NATIONAL BANK OF CHICAGO,
                                           as Trustee

                                  
                                         By: 
                                             ---------------------------------
                                             Name: 
                                             Title:

Attest:

By: 
    -------------------

[Corporate Seal]

 
                                ACKNOWLEDGMENTS
COMMONWEALTH
     STATE OF PENNSYLVANIA  )
              ------------  )
     COUNTY OF LANCASTER    )
               ---------

               BEFORE ME, the undersigned authority, on this day personally 
appeared,   E. A. Deaver       , the Executive Vice-President     of Armstrong 
          ---------------------                     -------------
World Industries, Inc., known to me to be the person whose name is subscribed 
to the above and foregoing instrument of writing, and acknowledged to me that 
he executed the same for the purposes and consideration therein expressed, in 
the capacity therein stated, and as the act and deed of said corporation; and,
being by me duly sworn, did depose and say that he resides at 121 Windover Turn,
                                                              ------------
Lancaster, Pennsylvania 17601, that he is the Exec. Vice-Pres. of said
- -----------------------------                 ---------------- 
corporation, that he knows the seal of said corporation, that the seal affixed 
to said instrument is such corporate seal, that it was so affixed by authority 
of the Board of Directors of said corporation, and that he signed his name 
thereto by like authority.

               GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 17th day of 
                                                            ----
October    1990.
- ---------
                                       /s/ Sherry L. Patterson
                                       -----------------------
                                            Notary Public 

                                          [NOTARIAL SEAL OF 
                                         SHERRY L. PATTERSON
                                            APPEARS HERE]


                                      14

 
STATE OF Illinois)
                 )
COUNTY OF Cook   )

          BEFORE ME, the undersigned authority, on this day personally 
appeared, J.B. Knauar, an Asst. Vice Pres., an officer of The First National
Bank of Chicago, known to me to be the person whose name is subscribed to the
above and foregoing instrument of writing, and acknowledged to me that she
executed the same for the purposes and consideration therein expressed, in the
capacity therein stated, and as the act and deed of said corporation; and, being
by me duly sworn, did depose and say that she resides at 325 Lincolnwood Rd,
Highland Park, IL 60035, that she is an officer of said corporation, that the
seal affixed to said instrument is such corporate seal, that it was so affixed
by authority of the Board of Directors of said corporation, and that she signed
her name thereto by like authority.

          GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 17th day of October 1990.


                                                       
                                                       -------------------------
                                                             Notary Public

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