Exhibit 4(i) November 12, 1997 BankBoston, N.A. Corporate Banking 1 Landmark Square Stamford, CT 06901 Attention: Jo Ann Keller, Director The Chase Manhattan Bank Global Chemicals and Related Industries 270 Park Avenue - 38th Floor New York, NY 10017-2070 Attention: Robert T. Sacks, Managing Director Citibank, N.A. 399 Park Avenue, 4th Floor, Zone 16 New York, NY 10043 Attention: Joronne J. Jeter, Vice President Credit Suisse First Boston New York Branch 11 Madison Avenue - 20th Floor New York, NY 10010-3629 Attention: Lynn Allegaert Morgan Guaranty Trust Company of New York 60 Wall Street New York, NY 10260-0060 Attention: Martin R. Atkin, Managing Director 2 NationsBank, N.A. Corporate Finance Group 767 Fifth Avenue New York, NY 10153-0083 Attention: George F. Van, Senior Vice President Wachovia Bank, N.A. 152 West 57th Street, 37th Floor New York, NY 10019 Attention: John Paul Mathis, Vice President Re: Third Amendment --------------- Dear Sirs: We refer to the Credit Agreement, dated as of September 30, 1993, as amended through October 26, 1996 ("Credit Agreement"), among Olin Corporation ("Borrower"), Bank of Boston Connecticut (now known as BankBoston, N.A.), The Chase Manhattan Bank, Citibank, N.A., Credit Suisse First Boston, Morgan Guaranty Trust Company of New York and NationsBank, N.A. Capitalized terms utilized but not defined herein have the meanings specified in the Credit Agreement. The following sets forth the agreement of the undersigned: 1. Upon effectiveness of this third amendment, (i) the Commitment of BankBoston, N.A. will be terminated and BankBoston, N.A. will no longer be a "Bank", lender, or a party to, the Credit Agreement, (ii) the Commitment of The Chase Manhattan Bank will be reduced from $90,000,000 to $70,000,000 and (iii) Wachovia Bank, N.A. will become a party to the Agreement as a "Bank" with its Commitment being $40,000,000 with its address as set forth in Schedule 1 hereto. 2. Except as amended hereby, the provisions of the Credit Agreement remain in full force and effect. 3. This third amendment shall become effective immediately prior to the effectiveness of the fourth amendment to the Credit Agreement attached hereto as Exhibit A. 4. This third amendment may be executed in any number of counterparts and each counterpart shall be deemed to be an original document. 3 The Borrower confirms that the representations and warranties contained in Section 4.01 of the Credit Agreement are correct as though made on and as of the date hereof (for this purpose the term "Agreement" as used in Section 4.01 shall mean the Credit Agreement as amended hereby). Kindly confirm by your signature below your agreement to the foregoing. BORROWER OLIN CORPORATION By /s/J. M. Pierpont ----------------------------------- Title: Vice President and Treasurer Commitment BANKS - ---------- ----- $ 20,000,000 BANKBOSTON, N.A. (formerly known as Bank of Boston Connecticut) By: /s/JoAnn Keller ------------------------------ Name: JoAnn Keller Title: Senior Vice President $ 50,000,000 CITIBANK, N.A. By: /s/James N. Simpson ------------------------------- Name: James N. Simpson Title: Attorney-in-Fact $ 20,000,000 CREDIT SUISSE FIRST BOSTON By: /s/Lynn Allegaert ------------------------------- Name: Lynn Allegaert Title: Vice President By: /s/Daniel R. Wenger ------------------------------- Name: Daniel R. Wenger Title: Associate 4 $ 40,000,000 MORGAN GUARANTY TRUST COMPANY OF NEW YORK By: /s/Penelope J. B. Cox ------------------------------- Name: Penelope J. B. Cox Title: Vice President $ 30,000,000 NATIONSBANK, N.A. By: /s/Eileen C. Higgins ------------------------------ Name: Eileen C. Higgins Title: Vice President $ 90,000,000 THE CHASE MANHATTAN BANK By: /s/Robert T. Sacks ------------------------------ Name: Robert T. Sacks Title: Managing Director $250,000,000 Total of the Commitments AGREED TO: WACHOVIA BANK, N.A. By: /s/James McCreary ----------------------------- Name: James F. McCreary Title: Senior Vice President 5 Schedule 1 Eurodollar Domestic Lending Lending Name of Bank Office CD Lending Office Office - ------------ ---------------- ----------------- ---------- Wachovia Bank, N.A. 191 Peachtree St. NE Same Same 28th Floor Atlanta, GA 30303 All Notices and A/B Advance Payments ------------------------------------ Wachovia Bank, N.A. 152 West 57th Street 37th Floor New York, NY 10019 Attention: John Paul Mathis Wire Instructions (A/B Advance Payments) ---------------------------------------- Wachovia Bank, N.A. 191 Peachtree Street, NE Atlanta, GA 30303 ABA# 061000010 FW Money Transfer Suspense Account No. 18171498 Attention: Complex Unit Re: Olin