EXHIBIT 4(N)
 
            ------------------------------------------------------------



                               GUARANTEE AGREEMENT

                                     between

                           ALUMINUM COMPANY OF AMERICA

                                       and

                          THE CHASE MANHATTAN BANK


                     Relating to the Preferred Securities of

                                  ALCOA TRUST I


                             Dated as of ____,19__


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

 
                             CROSS REFERENCE TABLE*
 
 
Section of Trust                                                                           Section of
Indenture Act of                                                                            Guarantee
1939, as amended                                                                            Agreement
                                                                                     
310(a).........................................................................................4.1(a)
310(b)....................................................................................4.1(c), 2.8
310(c)...................................................................................Inapplicable
311(a).........................................................................................2.2(b)
311(b).........................................................................................2.2(b)
311(c)...................................................................................Inapplicable
312(a).........................................................................................2.2(a)
312(b).........................................................................................2.2(b)
313...............................................................................................2.3
314(a)............................................................................................2.4
314(b)...................................................................................Inapplicable
314(c)............................................................................................2.5
314(d)...................................................................................Inapplicable
314(e)..................................................................................1.1, 2.5, 3.2
314(f)............................................................................................3.2
315(a).........................................................................................3.1(d)
315(b)............................................................................................2.7
315(c)............................................................................................3.1
315(d).........................................................................................3.1(d)
316(a)..................................................................................1.1, 2.6, 5.4
316(b)............................................................................................5.3
317(a)...................................................................................Inapplicable
317(b)...................................................................................Inapplicable
318(a).........................................................................................2.1(b)
318(b).........................................................................................2.1(b)
318(c).........................................................................................2.1(a)
 

________
*        This Cross-Reference Table does not constitute part of the Guarantee
         Agreement and shall not affect the interpretation of any of its terms
         or provisions.

 
                                TABLE OF CONTENTS
                                -----------------
 
                                                                                                                       
ARTICLE I
         DEFINITIONS............................................................................    2
                           SECTION 1.1  Definitions.............................................    2

ARTICLE II
         TRUST INDENTURE ACT....................................................................    5
                           SECTION 2.1  Trust Indenture Act; Application........................    6
                           SECTION 2.2  List of Holders.........................................    6
                           SECTION 2.3  Reports by the Guarantee Trustee........................    6
                           SECTION 2.4  Periodic Reports to Guarantee Trustee...................    6
                           SECTION 2.5  Evidence of Compliance with Conditions
                  Precedent.....................................................................    7
                           SECTION 2.6  Events of Default; Waiver...............................    7
                           SECTION 2.7  Event of Default; Notice................................    7
                           SECTION 2.8  Conflicting Interests...................................    7

ARTICLE III
         POWERS, DUTIES AND RIGHTS OF THE GUARANTEE TRUSTEE....................................     8
                           SECTION 3.1  Powers and Duties of the Guarantee Trustee
                   .............................................................................    8
                           SECTION 3.2  Certain Rights of Guarantee Trustee.....................    9
                           SECTION 3.3  Indemnity...............................................   11

ARTICLE IV
         GUARANTEE TRUSTEE.....................................................................    12
                           SECTION 4.1  Guarantee Trustee; Eligibility.........................    12
                           SECTION 4.2  Appointment, Removal and Resignation of the
                  Guarantee Trustee............................................................    12

ARTICLE V
         GUARANTEE.............................................................................    13
                           SECTION 5.1  Guarantee..............................................    13
                           SECTION 5.2  Waiver of Notice and Demand............................    13
                           SECTION 5.3  Obligations Not Affected...............................    14
 

                                        i

 
 
                                                                                                  

                           SECTION 5.4  Rights of Holders......................................    15
                           SECTION 5.5  Guarantee of Payment...................................    15
                           SECTION 5.6  Subrogation............................................    15
                           SECTION 5.7  Independent Obligations................................    16
                           SECTION 5.8  Subordination..........................................    16

ARTICLE VI
         COVENANTS.............................................................................    16
                           SECTION 6.1  Certain Covenants of the Guarantor.....................    16

ARTICLE VII
         TERMINATION...........................................................................    18
                           SECTION 7.1  Termination............................................    18

ARTICLE VIII
         SUBORDINATION OF GUARANTEE............................................................    18
                           SECTION 8.1  Guarantee Subordinate to Guarantor Senior
                  Debt.........................................................................    18
                           SECTION 8.2  Payment Over of Proceeds Upon Dissolution,
                  Etc..........................................................................    18
                           SECTION 8.3  No Payment When Guarantor Senior Debt in
                  Default......................................................................    19
                           SECTION 8.4  Guarantee Trustee to Effectuate Subordination
                   ............................................................................    20
                           SECTION 8.5  No Waiver of Subordination Provisions..................    20
                           SECTION 8.6  Notice to Guarantee Trustee............................    20
                           SECTION 8.7  Reliance on Judicial Order or Certificate of
                  Liquidating Agent............................................................    21
                           SECTION 8.8  Guarantee Trustee Not Fiduciary for Holders
                  of Guarantor Senior Debt.....................................................    21
                           SECTION 8.9  Rights of Guarantee Trustee as Holder of
                  Guarantor Senior Debt; Preservation of Guarantee Trustee's Rights
                   ............................................................................    21
                           SECTION 8.10  Certain Conversions or Exchanges Deemed
                  Payment......................................................................    21
 

                                       ii

 

                                                                                               
ARTICLE IX                                                            
         MISCELLANEOUS.........................................................................  22
                           SECTION 9.1  Successors and Assigns.................................  22
                           SECTION 9.2  Amendments.............................................  22
                           SECTION 9.3  Notices................................................  22
                           SECTION 9.4  Benefit................................................  23
                           SECTION 9.5  Interpretation.........................................  23
                           SECTION 9.6  Governing Law..........................................  24
 

                                       iii

 
                              GUARANTEE AGREEMENT


          This GUARANTEE AGREEMENT, dated as of _______, 19__, is executed and
delivered by ALUMINUM COMPANY OF AMERICA, a Pennsylvania corporation (the
"Guarantor") and THE CHASE MANHATTAN BANK, a corporation organized and existing
under the laws of the State of New York, as trustee (the "Guarantee Trustee"),
for the benefit of the Holders (as defined herein) from time to time of the
Preferred Securities (as defined herein) of Alcoa Trust I, a Delaware statutory
business trust (the "Issuer").

          WHEREAS, pursuant to an Amended and Restated Trust Agreement (the
"Trust Agreement"), dated as of _______, 19__, among the Trustees named therein,
the Guarantor, as Depositor, and the Holders from time to time of undivided
beneficial interests in the assets of the Issuer, the Issuer is issuing
_____________ of its _% [Convertible] Quarterly Income Preferred Securities
(liquidation amount $50 per preferred security) (the "Preferred Securities")
representing preferred undivided beneficial interests in the assets of the
Issuer and having the terms set forth in the Trust Agreement;

          WHEREAS, the Preferred Securities will be issued by the Issuer and the
proceeds thereof, together with the proceeds from the issuance of the Issuer's
Common Securities (as defined below), will be used to purchase the Debentures
(as defined in the Trust Agreement) of the Guarantor which will be deposited
with The Chase Manhattan Bank, as Property Trustee under the Trust Agreement, as
trust assets;

          WHEREAS, as incentive for the Holders to purchase Preferred
Securities, the Guarantor desires irrevocably and unconditionally to agree, to
the extent set forth herein, to pay to the Holders of the Preferred Securities
the Guarantee Payments (as defined herein) and to make certain other payments on
the terms and conditions set forth herein; and

          NOW, THEREFORE, in consideration of the purchase by each Holder of
Preferred Securities, which purchase the Guarantor hereby agrees shall benefit
the Guarantor, the Guarantor executes and delivers this Guarantee Agreement for
the benefit of the Holders from time to time of the Preferred Securities.

 
                                   ARTICLE I
                                  DEFINITIONS

          SECTION 1.1  Definitions.  As used in this Guarantee Agreement, the
terms set forth below shall, unless the context otherwise requires, have the
following meanings.  Capitalized or otherwise defined terms used but not
otherwise defined herein shall have the meanings assigned to such terms in the
Trust Agreement as in effect on the date hereof.

          "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct common control with such
specified Person, provided, however, that an Affiliate of the Guarantor shall
not be deemed to include the Issuer.  For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

          "Common Securities" means the securities representing common
beneficial interests in the assets of the Issuer.

          "Common Stock" shall mean the common stock, par value $1.00 per share,
of the Guarantor.

          "Debt" means, with respect to any Person, whether recourse is to all
or a portion of the assets of such Person and whether or not contingent, (i)
every obligation of such Person for money borrowed; (ii) every obligation of
such Person evidenced by bonds, debentures, notes or other similar instruments,
including obligations incurred in connection with the acquisition of property,
assets or businesses; (iii) every reimbursement obligation of such Person with
respect to letters of credit, bankers' acceptances or similar facilities issued
for the account of such Person; (iv) every obligation of such Person issued or
assumed as the deferred purchase price of property or services (but excluding
trade accounts payable or accrued liabilities arising in the ordinary course of
business); (v) every capital lease obligation of such Person; and (vi) every
obligation of the type referred to in clauses (i) through (v) of another Person
and all dividends of another person the payment of which, in either case, such
Person has guaranteed or for which such Person is responsible or liable,
directly or indirectly, as obligor or otherwise.

                                       2

 
          "Event of Default" means a default by the Guarantor on any of its
payment or other obligations under this Guarantee Agreement; provided, however,
that, except with respect to a default in payment of any Guarantee Payments, no
Event of Default shall be deemed to have occurred under this Guarantee Agreement
unless and until the Guarantor shall have received written notice of default and
shall not have cured such default within 60 days after receipt of such notice.

          "Guarantee Payments" means the following payments or distributions,
without duplication, with respect to the Preferred Securities, to the extent not
paid or made by or on behalf of the Issuer:  (i) any accumulated and unpaid
Distributions (as defined in the Trust Agreement) required to be paid on the
Preferred Securities, to the extent the Issuer shall have funds on hand legally
available therefor at such time, (ii) the redemption price set forth in the
Trust Agreement, including premium, if any, all accrued and unpaid Distributions
to the date of redemption (the "Redemption Price"), with respect to the
Preferred Securities called for redemption by the Issuer to the extent the
Issuer shall have funds on hand legally available therefor, and (iii) upon a
voluntary or involuntary dissolution, winding-up or liquidation of the Issuer,
other than in connection with the distribution of Debentures to the Holders or
the redemption tion of all Preferred Securities issued by the Issuer, the lesser
of (a) the aggregate of the liquidation amount of $50 per Preferred Security
plus accrued and unpaid Distributions on the Preferred Securities to the date of
payment to the extent the Issuer shall have funds on hand legally available to
make such payment and (b) the amount of assets of the Issuer remaining available
for distribution to Holders in liquidation of the Issuer (in either case, the
"Liquidation Distribution").

          "Guarantee Trustee" means The Chase Manhattan Bank, until a Successor
Guarantee Trustee has been appointed and has accepted such appointment pursuant
to the terms of this Guarantee Agreement and thereafter means each such
Successor Guarantee Trustee.

          "Guarantor Senior Debt" means the principal of (and premium, if any)
and interest, if any (including interest accruing on or after the filing of any
petition in bankruptcy or for reorganization relating to the Guarantor whether
or not such claim for post-petition interest is allowed in such proceeding), on
Debt of the Guarantor, whether incurred on or prior to the date of the Indenture
or thereafter incurred, unless, in the instrument creating or evidencing the
same or pursuant to which the same is outstanding, it is provided that such
obligations are not superior in right of payment to the Debentures.

                                       3

 
          "Holder" means any holder, as registered on the books and records of
the Issuer, of any Preferred Securities; provided, however, that in determining
whether the holders of the requisite percentage of Preferred Securities have
given any request, notice, consent or waiver hereunder, "Holder" shall not
include the Guarantor, the Guarantee Trustee or any Affiliate of the Guarantor
or the Guarantee Trustee.

          "Indenture" means the Indenture dated as of ____,19__ with
respect to the Debentures, between the Guarantor and The Chase Manhattan Bank,
as trustee, as the same may be supplemented and amended from time to time.

          "List of Holders" has the meaning specified in Section 2.2 (a).

          "Majority in Liquidation Amount of the Securities" means, except as
provided by the Trust Indenture Act, a vote by the Holder(s), voting separately
as a class, of more than 50% of the aggregate liquidation amount of all the
outstanding Preferred Securities issued by the Issuer.

          "Officers' Certificate" means, with respect to any Person, a
certificate signed by (i) the Chairman, Chief Executive Officer, President or a
Vice President, and by (ii) the Treasurer, an Assistant Treasurer, the
Controller, the Secretary or an Assistant Secretary of such Person, and
delivered to the Guarantee Trustee.  Any Officers' Certificate delivered with
respect to compliance with a condition or covenant provided for in this
Guarantee Agreement shall include:

              (a) a statement that each officer signing the Officers' Certifi-
cate has read the covenant or condition and the definitions relating thereto;

              (b) a brief statement of the nature and scope of the examination
or investigation undertaken by each officer in rendering the Officers'
Certificate;

                                       4

 
              (c) a statement that each such officer has made such examination
or investigation as, in such officer's opinion, is necessary to enable such
officer to express an informed opinion as to whether or not such covenant or
condition has been complied with; and

              (d) a statement as to whether, in the opinion of each such
officer, such condition or covenant has been complied with.

          "Person" means a legal person, including any individual, corporation,
estate, partnership, joint venture, association, joint stock company, limited
liability company, trust, unincorporated association, or government or any
agency or political subdivision thereof, or any other entity of whatever nature.

          "Responsible Officer" means, with respect to the Guarantee Trustee,
any officer of the Guarantee Trustee with direct responsibility for the
administration of this Guarantee Agreement, which may be an Executive Vice
President, Senior Vice President, any First Vice President, any Vice President,
any Assistant Vice President, the Secretary, any Assistant Secretary, the
Treasurer, any Assistant Treasurer, any Trust Officer or Assistant Trust Officer
or any other officer of the Corporate Trust Services Division of the Guarantee
Trustee customarily performing functions similar to those performed by any of
the above designated officers, and also means, with respect to a particular
corporate trust matter, any other officer to whom such matter is referred
because of that officer's knowledge of and familiarity with the particular
subject.

          "Successor Guarantee Trustee" means a successor Guarantee Trustee
possessing the qualifications to act as Guarantee Trustee under Section 4.1.

          "Trust Indenture Act" means the Trust Indenture Act of 1939, as
amended.


                                  ARTICLE II
                              TRUST INDENTURE ACT

          SECTION 2.1  Trust Indenture Act; Application.  (a)  This Guarantee
Agreement is subject to the provisions of the Trust Indenture Act that are
required to be part of this Guarantee Agreement and shall, to the extent
applicable, be governed by such provisions.

                                       5

 
          (b) If and to the extent that any provision of this Guarantee
Agreement limits, qualifies or conflicts with the duties imposed by Sections 310
to 317, inclusive, of the Trust Indenture Act, such imposed duties shall
control.

          SECTION 2.2  List of Holders. (a)  The Guarantor shall furnish or
cause to be furnished to the Guarantee Trustee (unless the Guarantee Trustee is
acting as Securities Registrar with respect to the Debentures under the
Indenture) (i) semi-annually, on or before __________ and _______ of each year,
a list, in such form as the Guarantee Trustee may reasonably require, of the
names and addresses of the Holders ("List of Holders") as of a date not more
than 15 days prior to the delivery thereof, and (ii) at such other times as the
Guarantee Trustee may request in writing, within 30 days after the receipt by
the Guarantor of any such request, a List of Holders as of a date not more than
15 days prior to the time such list is furnished, in each case to the extent
such information is in the possession or control of the Guarantor and is not
identical to a previously supplied list of Holders or has not otherwise been
received by the Guarantee Trustee.  Notwithstanding the foregoing, the Guarantor
shall not be obligated to provide such List of Holders at any time the Preferred
Securities are represented by one or more Global Securities (as defined in the
Indenture). The Guarantee Trustee may destroy any List of Holders previously
given to it on receipt of a new List of Holders.

          (b) The Guarantee Trustee shall comply with its obligations under
Section 311(a), Section 311(b) and Section 312(b) of the Trust Indenture Act.

          SECTION 2.3  Reports by the Guarantee Trustee. Within 60 days of May
15 of each calendar year, the Guarantee Trustee shall provide to the Holders
such reports as are required by Section 313 of the Trust Indenture Act, if any,
in the form and in the manner provided by Section 313 of the Trust Indenture
Act. The Guarantee Trustee shall also comply with the requirements of Section
313(d) of the Trust Indenture Act.

          SECTION 2.4  Periodic Reports to Guarantee Trustee.  The Guarantor
shall provide to the Guarantee Trustee, the Securities and Exchange Commission
and the Holders such documents, reports and information, if any, as required by
Section 314 of the Trust Indenture Act and the compliance certificate required
by Section 314 of the Trust Indenture Act in the form, in the manner and at the
times required by Section 314 of the Trust Indenture Act.

                                       6

 
          SECTION 2.5  Evidence of Compliance with Conditions Precedent. The
Guarantor shall provide to the Guarantee Trustee such evidence of compliance
with such conditions precedent, if any, provided for in this Guarantee Agreement
that relate to any of the matters set forth in Section 314(c) of the Trust
Indenture Act. Any certificate or opinion required to be given by an officer
pursuant to Section 314(c)(1) may be given in the form of an Officers'
Certificate.

          SECTION 2.6  Events of Default; Waiver.  The Holders of a Majority in
Liquidation Amount of the Securities may, by vote, on behalf of the Holders,
waive any past default or Event of Default and its consequences. Upon such
waiver, any such default or Event of Default shall cease to exist, and any
default or Event of Default arising therefrom shall be deemed to have been
cured, for every purpose of this Guarantee Agreement, but no such waiver shall
extend to any subsequent or other default or Event of Default or impair any
right consequent therefrom.

          SECTION 2.7  Event of Default; Notice. (a)  The Guarantee Trustee
shall, within 90 days after the occurrence of an Event of Default, transmit by
mail, first class postage prepaid, to the Holders, notices of all Events of
Default known to the Guarantee Trustee, unless such defaults have been cured
before the giving of such notice, provided, that, except in the case of a
default in the payment of a Guarantee Payment, the Guarantee Trustee shall be
protected in withholding such notice if and so long as the Board of Directors,
the executive committee or a trust committee of directors and/or Responsible
Officers of the Guarantee Trustee in good faith deter  mines that the
withholding of such notice is in the interests of the Holders.

          (b) The Guarantee Trustee shall not be deemed to have knowledge of any
Event of Default unless the Guarantee Trustee shall have received written
notice, or a Responsible Officer charged with the administration of the Trust
Agreement shall have obtained written notice, of such Event of Default.

          SECTION 2.8  Conflicting Interests.  The Trust Agreement and the
Indenture shall be deemed to be specifically described in this Guarantee
Agreement for the purposes of clause (i) of the first proviso contained in
Section 310(b) of the Trust Indenture Act.

                                       7

 
                                  ARTICLE III
              POWERS, DUTIES AND RIGHTS OF THE GUARANTEE TRUSTEE

          SECTION 3.1  Powers and Duties of the Guarantee Trustee. (a) This
Guarantee Agreement shall be held by the Guarantee Trustee for the benefit of
the Holders, and the Guarantee Trustee shall not transfer this Guarantee
Agreement to any Person except a Holder exercising his or her rights pursuant to
Section 5.4(iv) or to a Successor Guarantee Trustee on acceptance by such
Successor Guarantee Trustee of its appointment to act as Successor Guarantee
Trustee.  The right, title and interest of the Guarantee Trustee shall
automatically vest in any Successor Guarantee Trustee, upon acceptance by such
Successor Guarantee Trustee of its appointment hereunder, and such vesting and
cessation of title shall be effective whether or not conveyancing documents have
been executed and delivered pursuant to the appointment of such Successor
Guarantee Trustee.

          (b) If an Event of Default actually known to the Responsible Officer
of the Guarantee Trustee has occurred and is continuing, the Guarantee Trustee
shall enforce this Guarantee Agreement for the benefit of the Holders.

          (c) The Guarantee Trustee, before the occurrence of any Event of
Default and after the curing of all Events of Default that may have occurred,
shall undertake to perform only such duties as are specifically set forth in
this Guarantee Agreement, and no implied covenants shall be read into this
Guarantee Agreement against the Guarantee Trustee.  In case an Event of Default
has occurred (that has not been cured or waived pursuant to Section 2.6) and is
actually known to the Responsible Officer of the Guarantee Trustee, the
Guarantee Trustee shall exercise such of the rights and powers vested in it by
this Guarantee Agreement, and use the same degree of care and skill in its
exercise thereof, as a prudent person would exercise or use under the
circumstances in the conduct of his or her own affairs.

          (d) No provision of this Guarantee Agreement shall be construed to
relieve the Guarantee Trustee from liability for its own negligent action, its
own negligent failure to act or its own willful misconduct, except that:

              (i) prior to the occurrence of any Event of Default and after
     the curing or waiving of all such Events of Default that may have occurred;

                                       8

 
                (A) the duties and obligations of the Guarantee Trustee shall be
     determined solely by the express provisions of this Guarantee Agreement,
     and the Guarantee Trustee shall not be liable except for the performance of
     such duties and obligations as are specifically set forth in this Guarantee
     Agreement; and

                (B) in the absence of bad faith on the part of the Guarantee
     Trustee, the Guarantee Trustee may conclusively rely, as to the truth of
     the statements and the correctness of the opinions expressed therein, upon
     any certificates or opinions furnished to the Guarantee Trustee and
     conforming to the requirements of this Guarantee Agreement; but in the case
     of any such certificates or opinions that by any provision hereof or of the
     Trust Indenture Act are specifically required to be furnished to the
     Guarantee Trustee, the Guarantee Trustee shall be under a duty to examine
     the same to determine whether or not they conform to the requirements of
     this Guarantee Agreement;

          (ii)  the Guarantee Trustee shall not be liable for any error of
     judgment made in good faith by a Responsible Officer of the Guarantee
     Trustee, unless it shall be proved that the Guarantee Trustee was negligent
     in ascertaining the pertinent facts upon which such judgment was made;

          (iii) the Guarantee Trustee shall not be liable with respect to
     any action taken or omitted to be taken by it in good faith in accordance
     with the direction of the Holders of not less than a Majority in
     Liquidation Amount of the Securities relating to the time, method and place
     of conducting any proceeding for any remedy available to the Guarantee
     Trustee, or exercising any trust or power conferred upon the Guarantee
     Trustee under this Guarantee Agreement; and

          (iv)  no provision of this Guarantee Agreement shall require the
     Guarantee Trustee to expend or risk its own funds or otherwise incur
     personal financial liability in the performance of any of its duties or in
     the exercise of any of its rights or powers, if the Guarantee Trustee shall
     have reasonable grounds for believing that the repayment of such funds or
     liability is not reasonably assured to it under the terms of this Guarantee
     Agreement or adequate indemnity against such risk or liability is not
     reasonably assured to it.

                                       9

 
          SECTION 3.2  Certain Rights of Guarantee Trustee. (a)  Subject to the
provisions of Section 3.1:

          (i)    The Guarantee Trustee may rely and shall be fully protected in
     acting or refraining from acting upon any resolution, certificate,
     statement, proxy, instrument, opinion, report, notice, request, direction,
     consent, order, bond, debenture, note, other evidence of indebtedness or
     other paper or document believed by it to be genuine and to have been
     signed, sent or presented by the proper party or parties.

          (ii)   Any direction or act of the Guarantor contemplated by this
     Guarantee Agreement shall be sufficiently evidenced by an Officers'
     Certificate unless otherwise prescribed herein.

          (iii)  Whenever, in the administration of this Guarantee Agreement,
     the Guarantee Trustee shall deem it desirable that a matter be proved or
     established before taking, suffering or omitting to take any action
     hereunder, the Guarantee Trustee (unless other evidence is herein
     specifically prescribed) may, in the absence of bad faith on its part,
     request and rely upon an Officers' Certificate which, upon receipt of such
     request from the Guarantee Trustee, shall be promptly delivered by the
     Guarantor.

          (iv)   The Guarantee Trustee may consult with legal counsel, and the
     written advice or opinion of such legal counsel with respect to legal
     matters shall be full and complete authorization and protection in respect
     of any action taken, suffered or omitted to be taken by it hereunder in
     good faith and in accordance with such advice or opinion. Such legal
     counsel may be legal counsel to the Guarantor or any of its Affiliates and
     may be one of its employees. The Guarantee Trustee shall have the right at
     any time to seek instructions concerning the administration of this
     Guarantee Agreement from any court of competent jurisdiction.

          (v)    The Guarantee Trustee shall be under no obligation to
     exercise any of the rights or powers vested in it by this Guarantee
     Agreement at the request or direction of any Holder, unless such Holder
     shall have provided to the Guarantee Trustee such adequate security and
     indemnity as would satisfy a reasonable person in the position of the
     Guarantee Trustee, against the costs, expenses (including attorneys' fees
     and expenses) and liabilities that might be incurred by it in complying
     with such request or

                                      10

 
     direction, including such reasonable advances as may be requested by the
     Guarantee Trustee; provided that nothing contained in this Section
     3.2(a)(v) shall be taken to relieve the Guarantee Trustee, upon the
     occurrence of an Event of Default, of its obligation to exercise the rights
     and powers vested in it by this Guarantee Agreement and use the same degree
     of care and skill in the exercise thereof as a prudent person would
     exercise or use under the circumstances in the conduct of his or her own
     affairs.

          (vi)   The Guarantee Trustee shall not be bound to make any
     investigation into the facts or matters stated in any resolution,
     certificate, statement, instrument, opinion, report, notice, request,
     direction, consent, order, bond, debenture, note, other evidence of
     indebtedness or other paper or document, but the Guarantee Trustee, in its
     discretion, may make such further inquiry or investigation into such facts
     or matters as it may see fit.

          (vii)  The Guarantee Trustee may execute any of the trusts or
     powers hereunder or perform any duties hereunder either directly or by or
     through its agents or attorneys or any Affiliate, and the Guarantee Trustee
     shall not be responsible for any misconduct or negligence on the part of
     any such agent or attorney appointed with due care by it hereunder.

          (viii) Whenever in the administration of this Guarantee Agreement
     the Guarantee Trustee shall deem it desirable to receive instructions
     with respect to enforcing any remedy or right or taking any other action
     hereunder, the Guarantee Trustee (A) may request instructions from the
     Holders of a Majority in Liquidation Amount of the Securities, (B) may
     refrain from enforcing such remedy or right or taking such other action
     until such instructions are received, and (C) shall be protected in acting
     in accordance with such instructions.

          (ix)   Any action taken by the Guarantee Trustee or its agents
     hereunder shall bind the Holders, and the signature of the Guarantee
     Trustee or its agents alone shall be sufficient and effective to perform
     any such action. No third party shall be required to inquire as to the
     authority of the Guarantee Trustee to so act or as to its compliance with
     any of the terms and provisions of this Guarantee Agreement both of which
     shall be conclusively evidenced by the Guarantee Trustee's or its agent's
     taking such action.

                                      11

 
          (b) No provision of this Guarantee Agreement shall be deemed to impose
any duty or obligation on the Guarantee Trustee to perform any act or acts or
exercise any right, power, duty or obligation conferred or imposed on it in any
jurisdiction in which it shall be illegal, or in which the Guarantee Trustee
shall be unqualified or incompetent in accordance with applicable law, to
perform any such act or acts or to exercise any such right, power, duty or
obligation.  No permissive power or authority available to the Guarantee Trustee
shall be construed to be a duty to act in accordance with such power and
authority.

          SECTION 3.3  Indemnity.  The Guarantor agrees to indemnify the
Guarantee Trustee for, and to hold it harmless against, any loss, liability or
expense incurred without negligence or bad faith on the part of the Guarantee
Trustee, arising out of or in connection with the acceptance or administration
of this Guarantee Agreement, including the reasonable costs and expenses of
defending itself against any claim or liability in connection with the exercise
or performance of any of its powers or duties hereunder.  The Guarantee Trustee
will not claim or exact any lien or charge on any Guarantee Payment as a result
of any amount due to it under this Guarantee Agreement.


                                  ARTICLE IV
                               GUARANTEE TRUSTEE

          SECTION 4.1  Guarantee Trustee; Eligibility. (a)  There shall at all
times be a Guarantee Trustee which shall:

               (i)     not be an Affiliate of the Guarantor; and

               (ii)    be a Person that is eligible pursuant to the Trust
     Indenture Act to act as such and has a combined capital and surplus of at
     least $50,000,000, and shall be a corporation meeting the requirements of
     Section 310(a) of the Trust Indenture Act. If such corporation publishes
     reports of condition at least annually, pursuant to law or to the
     requirements of the supervising or examining authority, then, for the
     purposes of this Section and to the extent permitted by the Trust Indenture
     Act, the combined capital and surplus of such corporation shall be deemed
     to be its combined capital and surplus as set forth in its most recent
     report of condition so published.

                                      12

 
          (b) If at any time the Guarantee Trustee shall cease to be eligible to
so act under Section 4.1(a), the Guarantee Trustee shall immediately resign in
the manner and with the effect set out in Section 4.2(c).

          (c) If the Guarantee Trustee has or shall acquire any "conflicting
interest" within the meaning of Section 310(b) of the Trust Indenture Act, the
Guarantee Trustee and Guarantor shall in all respects comply with the provisions
of Section 310(b) of the Trust Indenture Act.  The Trust Agreement and the
Indenture shall not be deemed to constitute conflicting interests of the
Guarantee Trustee.

          SECTION 4.2  Appointment, Removal and Resignation of the Guarantee
Trustee.  (a)  Subject to Section 4.2(b) the Guarantee Trustee may be appointed
or removed without cause at any time by the Guarantor.

          (b) The Guarantee Trustee shall not be removed in accordance with
Section 4.2(a) until a Successor Guarantee Trustee has been appointed and has
accepted such appointment by written instrument executed by such Successor
Guarantee Trustee and delivered to the Guarantor.

          (c) The Guarantee Trustee appointed to office hereunder shall hold
office until a Successor Guarantee Trustee shall have been appointed or until
its removal or resignation.  The Guarantee Trustee may resign from office
(without need for prior or subsequent accounting) by an instrument in writing
executed by the Guarantee Trustee and delivered to the Guarantor, which
resignation shall not take effect until a Successor Guarantee Trustee has been
appointed and has accepted such appointment by an instrument in writing executed
by such Successor Guarantee Trustee and delivered to the Guarantor and the
resigning Guarantee Trustee.

          (d) If no Successor Guarantee Trustee shall have been appointed and
accepted appointment as provided in this Section 4.2 within 60 days after
delivery to the Guarantor of an instrument of resignation, the resigning
Guarantee Trustee may petition, at the expense of the Guarantor, any court of
competent jurisdiction for appointment of a Successor Guarantee Trustee.  Such
court may thereupon, after prescribing such notice, if any, as it may deem
proper, appoint a Successor Guarantee Trustee.

                                      13

 
                                   ARTICLE V
                                   GUARANTEE

          SECTION 5.1  Guarantee.  The Guarantor irrevocably and uncondi-
tionally agrees, subject to Section 5.8 and Article 8, to pay in full to the
Holders the Guarantee Payments (without duplication of amounts theretofore paid
by or on behalf of the Issuer), as and when due, regardless of any defense,
right of set-off or counter  claim which the Issuer may have or assert other
than the defense of payment.  The Guarantor's obligation to make a Guarantee
Payment may be satisfied by direct payment of the required amounts by the
Guarantor to the Holders or by causing the Issuer to pay such amounts to the
Holders.

          SECTION 5.2  Waiver of Notice and Demand.  The Guarantor hereby waives
notice of acceptance of the Guarantee Agreement and of any liability to which it
applies or may apply, presentment, demand for payment, any right to require a
proceeding first against the Guarantee Trustee, Issuer or any other Person
before proceeding against the Guarantor, protest, notice of nonpayment, notice
of dishonor, notice of redemption and all other notices and demands.

          SECTION 5.3  Obligations Not Affected.  The obligations, covenants,
agreements and duties of the Guarantor under this Guarantee Agreement shall in
no way be affected or impaired by reason of the happening from time to time of
any of the following:

          (a)   the release or waiver, by operation of law or otherwise, of the
performance or observance by the Issuer of any express or implied agreement,
covenant, term or condition relating to the Preferred Securities to be performed
or observed by the Issuer;

          (b)   the extension of time for the payment by the Issuer of all or
any portion of the Distributions, Redemption Price, Liquidation Distribution or
any other sums payable under the terms of the Preferred Securities or the
extension of time for the performance of any other obligation under, arising out
of, or in connection with, the Preferred Securities (other than an extension of
time for payment of Distributions that results from the extension of any
interest payment period on the Debentures as so provided in the Indenture);

                                      14

 
          (c)   any failure, omission, delay or lack of diligence on the part of
the Holders to enforce, assert or exercise any right, privilege, power or remedy
conferred on the Holders pursuant to the terms of the Preferred Securities, or
any action on the part of the Issuer granting indulgence or extension of any
kind;

          (d)   the voluntary or involuntary liquidation, dissolution, sale of
any collateral, receivership, insolvency, bankruptcy, assignment for the benefit
of creditors, reorganization, arrangement, composition or readjustment of debt
of, or other similar proceedings affecting, the Issuer or any of the assets of
the Issuer;

          (e)   any invalidity of, or defect or deficiency in, the Preferred
Securities;

          (f)   the settlement or compromise of any obligation guaranteed hereby
or hereby incurred; or

          (g)   any other circumstance whatsoever that might otherwise
constitute a legal or equitable discharge or defense of a guarantor, it being
the intent of this Section 5.3 that the obligations of the Guarantor hereunder
shall be absolute and unconditional under any and all circumstances.

          There shall be no obligation of the Holders or the Guarantee Trustee
to give notice to, or obtain the consent of, the Guarantor with respect to the
happening of any of the foregoing.

          SECTION 5.4  Rights of Holders.  The Guarantor expressly acknowledges
that: (i) this Guarantee Agreement will be deposited with the Guarantee Trustee
to be held for the benefit of the Holders; (ii) the Guarantee Trustee has the
right to enforce this Guarantee Agreement on behalf of the Holders; (iii) the
Holders of a Majority in Liquidation Amount of the Securities have the right to
direct the time, method and place of conducting any proceeding for any remedy
available to the Guarantee Trustee in respect of this Guarantee Agreement or to
direct the exercise of any trust or power conferred upon the Guarantee Trustee
under this Guarantee Agreement;  (iv) any Holder may institute a legal
proceeding directly against the Guarantor to enforce its rights under this
Guarantee Agreement, without first instituting a legal proceeding against the
Guarantee Trustee, the Issuer or any other Person; and (v) if an Event of
Default with respect to the Debentures constituting the failure to pay interest
or principal on the Debentures on the date such interest or principal is
otherwise payable has occurred and is continuing, then any Holder shall

                                      15

 
have the right, which is absolute and unconditional, to proceed directly against
the Guarantor to obtain Guarantee Payments without first waiting to determine if
the Guarantee Trustee has enforced this Guarantee Agreement or instituting a
legal proceeding against the Issuer, the Guarantee Trustee or any other Person.

          SECTION 5.5  Guarantee of Payment.  This Guarantee Agreement creates a
guarantee of payment and not of collection.  This Guarantee Agreement will not
be discharged except by payment of the Guarantee Payments in full (without
duplication of amounts theretofore paid by the Issuer) or upon distribution of
Debentures to Holders as provided in the Trust Agreement.

          SECTION 5.6  Subrogation.  The Guarantor shall be subrogated to all
(if any) rights of the Holders against the Issuer in respect of any amounts paid
to the Holders by the Guarantor under this Guarantee Agreement and shall have
the right to waive payment by the Issuer pursuant to Section 5.1; provided,
however, that the Guarantor shall not (except to the extent required by
mandatory provisions of law) be entitled to enforce or exercise any rights which
it may acquire by way of subrogation or any indemnity, reimbursement or other
agreement, in all cases as a result of payment under this Guarantee Agreement,
if, at the time of any such payment, any amounts are due and unpaid under this
Guarantee Agreement.  If any amount shall be paid to the Guarantor in violation
of the preceding sentence, the Guarantor agrees to hold such amount in trust for
the Holders and to pay over such amount to the Guarantor Trustee for the benefit
of the Holders.

          SECTION 5.7  Independent Obligations.  The Guarantor acknowledges
that its obligations hereunder are independent of the obligations of the Issuer
with respect to the Preferred Securities and that the Guarantor shall be liable
as principal and debtor hereunder to make Guarantee Payments pursuant to the
terms of this Guarantee Agreement notwithstanding the occurrence of any event
referred to in subsections (a) through (g), inclusive, of Section 5.3 hereof.

          SECTION 5.8  Subordination.  The Guarantee Agreement will constitute
an unsecured obligation of the Guarantor and will rank (i) subordinate and
junior in right of payment to all other liabilities of the Guarantor; (ii) pari
passu with the most senior preferred stock or preference stock, if any,
hereafter issued by the Guarantor and with any guarantee hereafter entered into
by the Guarantor in respect

                                      16

 
of any preferred or preference stock or interests of any affiliate of the
Guarantor** and (iii) senior to the Guarantor's Common Stock. Each Holder of
Preferred Securities, by its acceptance thereof, agrees to the subordination
provisions and other terms of this Guarantee Agreement.

          If an "Event of Default" (as defined in the Indenture) has occurred
and is continuing, the rights of holders of Common Securities to receive
Guarantee Payments under the Common Securities Guarantee Agreement are
subordinate to the rights of the Holders of Preferred Securities to receive
Guarantee Payments under this Guarantee Agreement.


                                  ARTICLE VI
                                   COVENANTS

          SECTION 6.1  Certain Covenants of the Guarantor.  (a)  Guarantor
covenants and agrees that if and so long as (i) the Issuer is the holder of all
the Debentures, (ii) a Tax Event (as defined in the Trust Agreement) in respect
of the Issuer has occurred and is continuing and (iii) the Guarantor has
elected, and has not revoked such election, to pay Additional Sums (as defined
in the Trust Agreement) in respect of the Preferred Securities and Common
Securities, the Guarantor will pay to the Issuer such Additional Sums.

          (b)   The Guarantor covenants and agrees that so long as any Preferred
Securities remain outstanding, it will not (i) declare or pay any dividends on
make any distributions with respect to, or redeem, purchase or make a
liquidation payment with respect to, any of its Common Stock (other than (i)
purchases or acquisitions of shares of Common Stock in connection with the
satisfaction by the Guarantor of its obligations under any employee benefit
plan, (ii) as a result of a reclassification of the Guarantor's Common Stock or
the exchange or conversion of one class or series of the Guarantor's Common
Stock for another class or series of the Guarantor's Common Stock, (iii) the
purchase of fractional interests in shares of the Guarantor's Common Stock
pursuant to the conversion or exchange provisions of such Common Stock of the
Guarantor or the security being converted or exchanged or (iv) purchases or
acquisitions of shares of Common Stock to be used in connec-

_____________________

**   Should we differentiate between operating subsidiaries and financing 
     subsidiaries?

                                      17

 
tion with acquisitions of Common Stock by shareholders pursuant to the
Guarantor's dividend reinvestment plan) or make any guarantee payments with
respect to the foregoing and (b) the Guarantor shall not make any payment of
principal or premium, if any, on or repurchase any debt securities (including
guarantees) other than at stated maturity issued by the Guarantor which rank
pari passu with or junior to the Debentures if at such time (x) there shall have
occurred any event of which the Guarantor has actual knowledge that (A) with the
giving of notice or the lapse of time, or both, would constitute an Event of
Default under this Guarantee Agreement or the Trust Agreement and (B) in respect
or which the Guarantor shall not have taken reasonable steps to cure or (y) the
Guarantor shall have given notice of its selection of an Extension Period (as
defined in the Indenture) with respect to the Debentures and shall not have
rescinded such notice, or such Extension Period, or any extension thereof, shall
be continuing.


          (c)   The Guarantor covenants and agrees (i) to maintain directly or
indirectly 100% ownership of the Common Securities, provided that certain 
successors which are permitted by the Indenture may succeed to the Guarantor's
ownership of the Common Securities, (ii) not to voluntarily terminate, wind-up
or liquidate the Issuer, except (a) in connection with a distribution of the
Debentures to the holders of the Preferred Securities in liquidation of the
Issuer or (b) in connection with certain mergers, consolidations or
amalgamations permitted by the Trust Agreement, (iii) to use its reasonable
efforts, consistent with the terms and provisions of the Trust Agreement, to
cause the Issuer to remain classified as a grantor trust for United States
Federal income tax purposes, (iv) for so long as Preferred Securities are
outstanding, not to convert Debentures except pursuant to a notice of conversion
delivered to the Conversion Agent (as defined in the Trust Agreement) by a
Holder, (v) to maintain the reservation for issuance of the number of shares of
Common Stock that would be required from time to time upon the conversion of all
the Debentures then outstanding, (vi) to deliver shares of Common Stock upon an
election by the Holders to convert such Preferred Securities into Common Stock
and (vii) to honor all obligations relating to the conversion or exchange of the
Preferred Securities into or for Common Stock or Debentures.


                                  ARTICLE VII
                                  TERMINATION

                                      18

 
          SECTION 7.1  Termination.  This Guarantee Agreement shall terminate as
to each Holder with respect to the Preferred Securities of the Issuer and be of
no further force and effect upon the earliest of (i) full payment of the 
redemption price of all Preferred Securities, (ii) distribution of the
Debentures of the Guaran tor held by the Issuer to the Holders or (iii) full
payment of the amounts payable in accordance with the Trust Agreement upon
liquidation of the Issuer. Notwithstanding the foregoing, this Guarantee
Agreement will continue to be effective or will be reinstated, as the case may
be, if at any time any Holder must restore payment of any sums paid under such
Preferred Securities or this Guarantee Agreement.


                                  ARTICLE VII
                           SUBORDINATION OF GUARANTEE

          SECTION 8.1  Guarantee Subordinate to Guarantor Senior Debt. The
Guarantor covenants and agrees, and each Holder, by its acceptance thereof,
likewise covenants and agrees, that the payment of the Guarantee Payments
pursuant to this Guarantee Agreement is hereby expressly made subordinate and
subject in right of payment to the prior payment in full in cash of all amounts
then due and payable in respect of all Guarantor Senior Debt (whether
outstanding on the date hereof or hereafter created, incurred, assumed or
guaranteed), and that the subordination is for the benefit of the holders of
Guarantor Senior Debt and that no payment of the Guarantee Payments pursuant to
this Guarantee Agreement may be made unless full payment of all amounts then due
for principal, premium, if any, and interest then due on all Guarantor Senior
Debt (by lapse of time, acceleration or otherwise) has been made or duly
provided for in cash or in a manner satisfactory to the holders of such
Guarantor Senior Debt.

          SECTION 8.2  Payment Over of Proceeds Upon Dissolution, Etc. Upon any
distribution of the Guarantor's assets in connection with any dissolution,
winding-up, liquidation or reorganization of the Guarantor, whether voluntary or
involuntary, in bankruptcy, insolvency or receivership proceedings (each such
event, if any, herein sometimes referred to as a "Proceeding"), or upon an
assignment for the benefit of creditors or otherwise:  (i) all Guarantor Senior
Debt (including without limitation all interest accruing on or after the filing
of any petition in bankruptcy relating to the Guarantor at the relevant
contractual rate, whether or not such claim for post-petition interest is
allowed in such Proceeding) must be paid in

                                      19

 
full in cash before the Holders are entitled to any payments or distributions of
any kind or character on account of any Guarantee Payments pursuant to this
Guarantee Agreement, and (ii) any payment or distribution of the Guarantor's
assets of any kind or character, whether in cash, securities or other property,
which would otherwise (but for these subordination provisions) be payable or
deliverable in respect of the Guarantee Payments shall be paid or delivered
directly to the holders of such Guarantor Senior Debt (or their representative
or trustee) in accordance with the priorities then existing among such holders
until all Guarantor Senior Debt shall have been paid in full in cash before any
payment or distribution is made to the Holders.

          In the event that, notwithstanding the subordination provisions set
forth herein, any payment or distribution of assets of any kind or character is
made at a time when the respective payment is not permitted to be made as a
result of the subordination provisions described above and before all Guarantor
Senior Debt is paid in full in cash, the Guarantee Trustee or the Holders
receiving such payment will be required to pay over such payment or distribution
to the holders of such Guarantor Senior Debt.

          The consolidation of the Guarantor with, or the merger of the
Guarantor into, another Person or the liquidation or dissolution of the
Guarantor following the sale of all or substantially all of its properties and
assets as an entirety to another Person upon the terms and conditions set forth
in Article VIII of the Indenture shall not be deemed a Proceeding for the
purposes of this Section if the Person formed by such consolidation or into
which the Guarantor is merged or the Person which acquires by sale such
properties and assets as an entirety, as the case may be, shall, as a part of
such consolidation, merger, or sale comply with the conditions set forth in
Article 8.

          SECTION 8.3  No Payment When Guarantor Senior Debt in Default. In the
event and during the continuation of any default in the payment of principal of
(or premium, if any) or interest on, or any other amounts owing with respect to,
any Guarantor Senior Debt when the same becomes due and payable or in the event
any judicial proceeding shall be pending with respect to any such default, then,
unless and until such default shall have been cured or waived or shall have
ceased to exist, no payment or distribution of any kind or character, whether in
cash or properties shall be made by the Guarantor on account of any Guarantee
Payment.

          The Guarantor shall give prompt written notice to the Guarantee
Trustee of any default in payment of principal of or interest on any Guarantor
Senior

                                      20

 
Debt; provided that no failure to give such a notice shall have any effect
whatsoever on the subordination provisions described herein.

          In the event that, notwithstanding the foregoing, the Guarantor shall
make any payment to the Guarantee Trustee or any Holder prohibited by the
foregoing provisions of this Section, and if such fact shall, at or prior to the
time of such payment, have been made known as set forth in Section 8.6, to the
Guarantee Trustee or, as the case may be, such Holder, then and in such event
such payment shall be paid over and delivered forthwith to the Guarantor.

          The provisions of this Section shall not apply to any payment with
respect to which Section 8.2 would be applicable.

          SECTION 8.4  Guarantee Trustee to Effectuate Subordination.  Each
Holder by his or her acceptance thereof authorizes and directs the Guarantee
Trustee on his or her behalf to take such action as may be necessary or
appropriate to acknowledge or effectuate the subordination provided in this
Article and appoints the Guarantee Trustee as his or her attorney-in-fact for
any and all such purposes.

          SECTION 8.5  No Waiver of Subordination Provisions.  No right of any
present or future holder of any Guarantor Senior Debt to enforce subordination
as herein provided shall at any time in any way be prejudiced or impaired by any
act or failure to act on the part of the Guarantor or by any act or failure to
act, in good faith, by any such holder, or by any noncompliance by the Guarantor
with the terms, provisions and covenants of this Guarantee Agreement, regardless
of any knowledge thereof that any such holder may have or be otherwise charged
with.

          SECTION 8.6  Notice to Guarantee Trustee.  The Guarantor shall give
written notice as soon as commercially practicable to the Guarantee Trustee of
any fact actually known to the Guarantor which would prohibit the making of any
payment to or by the Guarantee Trustee in respect of the Guarantee Payments.
Notwithstanding the provisions of this Article or any other provision of this
Guarantee Agreement, the Guarantee Trustee shall not be charged with knowledge
of the existence of any facts which would prohibit the making of any payment to
or by the Guarantee Trustee in respect of the Guarantee Payments, unless and
until the Guarantee Trustee shall have received written notice thereof from
the Guarantor or a Person representing itself as a holder of Guarantor Senior
Debt or from any trustee, agent or representative therefor (whether or not the
facts contained in such notice are true).

                                      21

 
          SECTION 8.7  Reliance on Judicial Order or Certificate of Liquidating
Agent.  Upon any payment or distribution of assets of the Guarantor referred to
in this Article, the Guarantee Trustee, subject to the provisions of Article 3,
and the Holders shall be entitled to rely upon any order or decree entered by
any court of competent jurisdiction in which a Proceeding is pending, or a
certificate of the trustee in bankruptcy, receiver, liquidating trustee,
custodian, assignee for the benefit of creditors, agent or other Person making
such payment or distribution, delivered to the Guarantee Trustee or to the
Holders, for the purpose of ascertaining the Persons entitled to participate in
such payment or distribution, the holders of the Guarantor Senior Debt and other
indebtedness of the Guarantor, the amount thereof or payable thereon, the amount
or amounts paid or distributed thereon and all other facts pertinent thereto or
to this Article.

          SECTION 8.8 Guarantee Trustee Not Fiduciary for Holders of Guarantor
Senior Debt. With respect to the holders of the Guarantor Senior Debt, the
Guarantee Trustee undertakes to perform or observe only such of its obligations
and covenants as are set forth in this Article 8, and no implied covenants or
obligations with respect to the holders of such Guarantor Senior Debt shall be
read into this Guarantee Agreement against The Chase Manhattan Bank and/or the
Guarantee Trustee. The Chase Manhattan Bank and/or the Guarantee Trustee shall
not be deemed to owe any fiduciary duty to the holders of such Guarantor Senior
Debt and, subject to the provisions of Section 3.2, neither the Guarantee
Trustee nor The Chase Manhattan Bank shall be liable to the holder of any
Guarantor Senior Debt if it shall pay over or deliver to Holders, the Guarantor,
or any other person, money or assets to which any holder of such Guarantor
Senior Debt shall be entitled by virtue of this Article 8 or otherwise.

          SECTION 8.9  Rights of Guarantee Trustee as Holder of Guarantor Senior
Debt; Preservation of Guarantee Trustee's Rights.  The Guarantee Trustee in its
individual capacity shall be entitled to all the rights set forth in this
Article with respect to any Guarantor Senior Debt which may at any time be held
by it, to the same extent as any other holder of Guarantor Senior Debt, and,
subject to the requirements of the Trust Indenture Act, nothing in this
Guaranty Agreement shall deprive the Guarantee Trustee of any of its rights as
such holder.

          SECTION 8.10  Certain Conversions or Exchanges Deemed Payment.  For
the purpose of this Article only, (a) the issuance and delivery of junior
securities upon conversion or exchange of Debentures shall not be deemed to

                                      22

 
constitute a payment or distribution on account of the principal of (or premium,
if any) or interest (including any Additional Interest) on the Debentures or on
account of the purchase or other acquisition of Debentures, and (b) the payment,
issuance or delivery of cash (including any payments for fractional shares),
property or securities (other than junior securities) upon conversion or
exchange of a Debenture shall be deemed to constitute payment on account of the
principal of such security.  For the purpose of this Section, the term "junior
securities" means (i) shares of any stock of any class of the Guarantor and (ii)
securities of the Guarantor which are subordinated in right of payment to all
Guarantor Senior Debt which may be outstanding at the time of issuance or
delivery of such securities to substantially the same extent as, or to a greater
extent than, the Debentures which are so subordinated as provided in this
Article.


                                  ARTICLE IX
                                 MISCELLANEOUS

          SECTION 9.1  Successors and Assigns.  All guarantees and agreements
contained in this Guarantee Agreement shall bind the successors, assigns,
receivers, trustees and representatives of the Guarantor and shall inure to the
benefit of the Holders of the Preferred Securities then outstanding.  Except in
connection with a consolidation, merger or sale involving the Guarantor that is
permitted under Article 8 of the Indenture and pursuant to which the assignee
agrees in writing to perform the Guarantor's obligations hereunder, the
Guarantor shall not assign its obligations hereunder.

          SECTION 9.2  Amendments.  Except with respect to any changes which do
not adversely affect the rights of the Holders in any material respect (in which
case no consent of the Holders will be required), this Guarantee Agreement may
only be amended with the prior approval of the Holders of not less than a
Majority in Liquidation Amount of the Securities.  The provisions of Article 6
of the Trust Agreement concerning meetings of the Holders shall apply to the
giving of such approval.  The Guarantor shall furnish the Guarantee Trustee with
an Officers' Certificate and an Opinion of Counsel to the effect that any
amendment of this Agreement is authorized and permitted and that all conditions 
precedent, if any, in this Guarantee Agreement, to the execution and delivery of
such amendment have been satisfied.

          SECTION 9.3  Notices.  Any notice, request or other communication
required or permitted to be given hereunder shall be in writing, duly signed by
the party giving such notice, and delivered, telecopied or mailed by first class
mail as

                                      23

 
follows:  (a)  if given to the Guarantor, to the address set forth below
or such other address as the Guarantor may give notice of to the Holders:

       Aluminum Company of America
       201 Isabella Street
       Pittsburgh, Pennsylvania 15212-5858
       Attention: Treasurer

          (b)   if given to the Issuer, in care of the Guarantee Trustee, at the
Issuer's (and the Guarantee Trustee's) address set forth below or such other
address as the Guarantee Trustee on behalf of the Issuer may give notice of to
the Holders:

       Alcoa Trust I
       c/o Aluminum Company of America
       201 Isabella Street
       Pittsburgh, Pennsylvania 15212-5858
       Attention: Treasurer

       with a copy to:

       The Chase Manhattan Bank
       450 West 33/rd/ Street, 15th Floor
       New York, New York 10001
       Attention: Global Trust Services

          (c)   if given to any Holder, at the address set forth on the books
and records of the Issuer.

          All notices hereunder shall be deemed to have been given when received
in person, telecopied with receipt confirmed, or mailed by first class mail,
postage prepaid, except that if a notice or other document is refused delivery
or cannot be delivered because of a changed address of which no notice was
given, such notice or other document shall be deemed to have been delivered on
the date of such refusal or inability to deliver.

          SECTION 9.4  Benefit.  This Guarantee Agreement is solely for the
benefit of the Holders and is not separately transferable from the Preferred
Securities.

                                      24

 
          SECTION 9.5  Interpretation.  In this Guarantee Agreement, unless the
context otherwise requires:

          (a)   capitalized terms used in this Guarantee Agreement but not
defined in the preamble hereto have the respective meanings assigned to them in
Section 1.1;

          (b)   a term defined anywhere in this Guarantee Agreement has the same
meaning throughout;

          (c)   all references to "the Guarantee Agreement" or "this Guarantee
Agreement" are to this Guarantee Agreement as modified, supplemented or amended
from time to time;

          (d)   all references in this Guarantee Agreement to Articles and
Sections are to Articles and Sections of this Guarantee Agreement unless
otherwise specified;

          (e)   a term defined in the Trust Indenture Act has the same meaning
when used in this Guarantee Agreement unless otherwise defined in this Guarantee
Agreement or unless the context otherwise requires;

          (f)   a reference to the singular includes the plural and vice versa;
and

          (g)   the masculine, feminine or neuter genders used herein shall
include the masculine, feminine and neuter genders.

          SECTION 9.6  Governing Law.  THIS GUARANTEE AGREEMENT SHALL BE
GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK WITH  OUT REGARD TO THE CONFLICTS OF LAW PRINCIPLES THEREOF.

          This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                      25

 
          THIS GUARANTEE AGREEMENT is executed as of the day and year first
above written.


                              ALUMINUM COMPANY
                              OF AMERICA


                              By: ____________________________
                                  Name:
                                  Title:


                              THE CHASE MANHATTAN BANK
                              as Guarantee Trustee


                              By: ____________________________
                                  Name:
                                  Title:

                                      26