OREGON METALLURGICAL CORP
SC 13D, 1997-09-08
ROLLING DRAWING & EXTRUDING OF NONFERROUS METALS
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                                   UNITED STATES
                        SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549

                                    SCHEDULE 13D

                     Under the Securities Exchange Act of 1934
                              (Amendment No.  )*


                        OREGON METALLURGICAL CORPORATION
- --------------------------------------------------------------------------------
                                 (Name of Issuer)

                                 Common Stock
- --------------------------------------------------------------------------------
                          (Title of Class of Securities)

                                   685899106
                     ----------------------------------------
                                  (CUSIP Number)


       Stuart B. Panish c/o Zweig-DiMenna Associates LLC, 900 Third Avenue,
                   New York, New York 10022   (212) 451-1100
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                   Communications)

                                August 28, 1997
                     ----------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report 
the acquisition which is the subject of this Schedule 13D, and is filing this 
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [_]. (A fee 
is not required only if the reporting person: (1) has a previous statement on 
file reporting beneficial ownership of more than five percent of the class of 
securities described in Item 1; and (2) has filed no amendment subsequent 
thereto reporting beneficial ownership of five percent or less of such class.) 
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed 
with the Commission. See Rule 13d-1(a) for other parties to whom copies are to 
be sent.

*The remainder of this cover page shall be filled out for a reporting person's 
initial filing on this form with respect to the subject class of securities, 
and for any subsequent amendment containing information which would alter 
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be 
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange 
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of 
the Act but shall be subject to all other provisions of the Act (however, see 
the Notes).


<PAGE>

                                 SCHEDULE 13D

CUSIP No. 6085899106                                      Page 2 of __ Pages


1  NAME OF REPORTING PERSON
   S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Zweig-DiMenna Partners, L.P., Zweig-DiMenna International Limited
        Zweig-DiMenna International Managers, Inc., on behalf of a
         discretionary account       
        Gotham Advisors, Inc., on behalf of a discretionary account
        Zweig/Glaser Advisers, on behalf of discretionary accounts

2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                 (a) [_]
                                                                     (b) [_]

3  SEC USE ONLY

4 SOURCE OF FUNDS*  WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
  ITEMS  2(d) or 2(e)                                                    [_]    

6  CITIZENSHIP OR PLACE OF ORGANIZATION
    
        Zweig-DiMenna Partners, L.P. - New York, Zweig-DiMenna International
        Limited - British Virgin Islands
        Zweig-DiMenna International Managers, Inc., on behalf of a 
          discretionary account - Delaware
        Gotham Advisors, Inc., on behalf of a discretionary account - Delaware
        Zweig/Glaser Advisers, on behalf of discretionary accounts -
          New York


NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7  SOLE VOTING POWER
 
        Zweig-DiMenna Partners, L.P.-215,400; Zweig-DiMenna 
          International Limited - 471,300
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-106,300
        Gotham Advisors, Inc., on behalf of discretionary account - 59,000
        Zweig/Glaser Advisers, on behalf of  discretionary accounts -36,500

8  SHARED VOTING POWER

        0

9  SOLE DISPOSITIVE POWER

        Zweig-DiMenna Partners, L.P.-215,400; Zweig-DiMenna 
          International Limited - 471,300
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-106,300
        Gotham Advisors, Inc., on behalf of discretionary account - 59,000
        Zweig/Glaser Advisers, on behalf of discretionary accounts -36,500

10 SHARED DISPOSITIVE POWER

        0

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
        Zweig-DiMenna Partners, L.P.-215,400; Zweig-DiMenna 
          International Limited - 471,300
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-106,300
        Gotham Advisors, Inc., on behalf of discretionary account - 59,000
        Zweig/Glaser Advisers, on behalf of discretionary accounts -36,500
                
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          [_]
                
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
        
        Total-5.4%
        
        Zweig-DiMenna Partners, L.P. - 1.3%; Zweig-DiMenna International
          Limited - 2.9%
        Zweig-DiMenna International Managers, Inc., on behalf of a
        discretionary account - 0.6%
        Gotham Advisors, Inc., on behalf of a discretionary account - 0.4%
        Zweig/Glaser Advisers, on behalf of discretionary accounts - 0.2%

14 TYPE OF REPORTING PERSON*
        
        Zweig-DiMenna Partners, L.P. - PN
        Zweig-DiMenna International Limited - CO
        Zweig-DiMenna International Managers, Inc. - CO
        Gotham Advisors, Inc. - CO
        Zweig/Glaser Advisers - PN

<PAGE>
 
                                 SCHEDULE 13D

ITEM 1  SECURITY AND ISSUER

     Oregon Metallurgical Corporation
     530 34th Avenue S.W.
     Albany, Oregon 97321;
     Common stock, par value $1.00 per share.
        
ITEM 2  IDENTITY AND BACKGROUND

A.   Zweig-DiMenna Partners, L.P.

     Zweig-DiMenna Partners, L.P., a New York limited partnership, is a private
     investment partnership which seeks appreciation of the Partnership's assets
     for the benefit of its partners. The address of its principal business and
     its principal office is 900 Third Avenue, New York, New York 10022. The
     following information is provided as to each general partner of Zweig-
     DiMenna Partners, L.P.:
 
     1.   Zweig-DiMenna Associates LLC, a New York limited liability company, is
          the managing general partner of Zweig-DiMenna Partners, L.P. Its
          principal business and office address is 900 Third Avenue, New York,
          New York 10022. Its managing directors are Martin E. Zweig and Joseph
          A. DiMenna, and its principals are Brenda M. Earl, Carol R. Whitehead
          and Jeffrey R. Perry. Dr. Zweig, Mr. DiMenna, Ms. Earl, Ms. Whitehead
          and Mr. Perry are the sole members of Zweig-DiMenna Associates LLC.
          The following information is provided as to each of the above
          mentioned managing directors and principals.

     i)   a)  Name - Martin E. Zweig

          b)  Residence or Business Address - 900 Third Avenue, New York, New
              York 10022.
 
          c)  Present Principal Occupation, etc. - Dr. Zweig is Chairman of the
              Board and President of The Zweig Fund, Inc. and The Zweig Total
              Return Fund, Inc., each of which is a New York Stock Exchange
              listed investment company. He is also President of Zweig Advisors
              Inc., Zweig Total Return Advisors, Inc., Gotham Advisors, Inc.,
              Zweig Associates, Inc., Zweig-DiMenna International Managers, Inc.
              and Zweig Securities Advisory Service, Inc. He is Chairman of
              Euclid Advisors LLC. He is President of the Zweig Series Trust
              mutual fund and Chairman of Zweig/Glaser Advisers, the investment
              manager of the Zweig Series Trust. Dr. Zweig is a Managing
              Director of the Managing General Partner of Zweig-DiMenna
              Partners, L.P. and Zweig-DiMenna Special Opportunities, L.P.,
<PAGE>
 
              each of which is an investment partnership. The business address
              of the principal entities referred to above is 900 Third Avenue,
              New York, New York 10022.

          d)  Dr. Zweig is a citizen of the United States.

     ii)  a)  Name - Joseph A. DiMenna.

          b)  Residence or Business Address - 900 Third Avenue, New York, New
              York 10022.

          c)  Present Principal Occupation, etc. - Mr. DiMenna is a Managing
              Director of the Managing General Partner of Zweig-DiMenna
              Partners, L.P. and Zweig-DiMenna Special Opportunities, L.P.,
              Executive Vice President and Treasurer of Zweig Associates, Inc.,
              Executive Vice President of Zweig-DiMenna International Managers,
              Inc. and Vice President of Gotham Advisors, Inc. The business
              address of the principal entities referred to above is 900 Third
              Avenue, New York, New York 10022.

          d)  Mr. DiMenna is a citizen of the United States.

     iii) a)  Name - Brenda M. Earl.

          b)  Residence or Business Address - 900 Third Avenue, New York, New
              York 10022.

          c)  Present Principal Occupation, etc. - Ms. Earl is a Principal of
              the Managing General Partner of Zweig-DiMenna Partners, L.P. and
              Zweig-DiMenna Special Opportunities, L.P., Vice President -
              Research of Zweig Associates, Inc., and Vice President - Research
              of Zweig-DiMenna International Managers, Inc. The business address
              of the principal entities referred to above is 900 Third Avenue,
              New York, New York 10022.

          d)  Ms. Earl is a citizen of the United States.

     iv)  a)  Name - Carol R. Whitehead.

          b)  Residence or Business Address - 900 Third Avenue, New York, New
              York 10022.

          c) Present Principal Occupation, etc. - Ms. Whitehead is a Principal
             of the Managing General Partner of Zweig-DiMenna Partners, L.P. and
             Zweig-DiMenna Special Opportunities, L.P., Vice President -
             Marketing of Zweig Associates, Inc., and Vice President - Business
             Development of Zweig-DiMenna International Managers, Inc. The
             business address of the principal entities referred to above is 900
             Third Avenue, New York, New York 10022.

<PAGE>
 
          d)  Ms. Whitehead is a citizen of the United States.

     v)   a)  Name - Jeffrey R. Perry.

          b)  Residence or Business Address - 900 Third Avenue, New York, New
              York 10022.

          c)  Present Principal Occupation, etc. - Mr. Perry is a Principal of
              the Managing General Partner of Zweig-DiMenna Partners, L.P. and
              Zweig-DiMenna Special Opportunities, L.P., Vice President -
              Research of Zweig Associates, Inc., and Vice President - Research
              of Zweig-DiMenna International Managers, Inc. The business address
              of the principal entities referred to above is 900 Third Avenue,
              New York, New York 10022.

          d)  Mr. Perry is a citizen of the United States.

     2.   Zweig Associates, Inc., a New York corporation, is a general partner
          of Zweig-DiMenna Partners L.P.  Its principal business and office
          address is 900 Third Avenue, New York, New York 10022.  Martin E.
          Zweig is President, Joseph A. DiMenna is Executive Vice President,
          Carol R. Whitehead is Vice President - Marketing and Brenda M. Earl
          and Jeffrey R. Perry is each a Vice President - Research of Zweig
          Associates, Inc.  Martin E. Zweig, Joseph A. DiMenna and Carol
          Whitehead are the directors and shareholders of Zweig Associates, Inc.
          Reference is made to Item 2.A.1, above, for information about such
          individuals.

          None of the above, i.e., Zweig-DiMenna Partners, L.P., Zweig-DiMenna
          Associates LLC, Zweig Associates, Inc., Martin E. Zweig, Joseph A.
          DiMenna, Brenda M. Earl, Carol R. Whitehead or Jeffrey R. Perry has,
          during the last five years, (i) been convicted in a criminal
          proceeding (excluding traffic violations or similar misdemeanors) or
          (ii) been a party to a civil proceeding of a judicial or
          administrative body of competent jurisdiction and as a result of such
          proceeding was or is subject to a judgment, decree or final order
          enjoining future violations of, or prohibiting or mandating activities
          subject to, Federal or State securities laws or finding any violation
          with respect to such laws.

B.   Zweig-DiMenna International Limited

          Zweig-DiMenna International Limited is incorporated in the Territory
          of the British Virgin Islands. Its business is investing and trading
          primarily in U.S. equity securities. The address of its principal
          business and its principal office is Maritime House, Frederick Street,
          Suite 200, P.O. Box N-9932, Nassau, Bahamas. The following information
          is provided as to each executive officer
<PAGE>
 
          and director of such corporation, each person controlling such
          corporation and each executive officer and director of any corporation
          or other person ultimately in control of such corporation:

     1.   a)  Name - Cedric B. Moss, Managing Director.

          b)  Residence or Business Address - c/o Dominion Management Services
              Limited, P.O. Box N-9932, Maritime House, Frederick Street,
              Nassau, Bahamas.

          c)  Present Principal Occupation, etc. - Mr. Moss is President of
              Dominion Management Services Limited, the Administrator of Zweig-
              DiMenna International Limited. The business address of the entity
              referred to above is Dominion Management Services Limited, P.O.
              Box N-9932, Maritime House, Frederick Street, Nassau, Bahamas.

          d)  Mr. Moss is a Bahamian citizen.

     2.   a)  Name - Frederick A. Mitchell, Director
 
          b)  Residence or Business Address - P.O. Box N3928, Gwendolyn House,
              Nassau, Bahamas. 

          c)  Present Principal Occupation, etc. - Mr. Mitchell is a practicing
              attorney in the firm Gwendolyn House in Nassau. He is a Senator
              in the Senate of the Commonwealth of The Bahamas.

          d)  Mr. Mitchell is a Bahamian citizen.
 
     3.   a)  Name - Michael D. Riegels, Director.
 
          b)  Residence or Business Address - Harney, Westwood & Riegels,
              Craigmuir Chambers, P.O. Box 71, Road Town, Tortola, British
              Virgin Islands.

          c)  Present Principal Occupation, etc. - Mr. Riegels is the Senior
              Partner of the law firm of Harney, Westwood & Riegels.

          d)  Mr. Riegels is a British Dependent Territories Citizen.

     4.   Zweig-DiMenna International Managers, Inc. - the Investment Manager of
          Zweig-DiMenna International Limited.  It is incorporated under the
          laws of the State of Delaware.  Its principal business address and the
          address of its principal office is 900 Third Avenue, New York, New
          York 10022. Dr. Martin E. Zweig and Mr. Joseph A. DiMenna are the
          directors and principal officers, and Ms. Carol R Whitehead is Vice
          President - Business Development, and Ms. Brenda M. Earl and Mr.
          Jeffrey R. Perry is each a Vice President - Research, of Zweig-DiMenna
          International Managers, Inc. Martin E. Zweig and Joseph A. DiMenna are
          the
<PAGE>
 
          principal stockholders of Zweig-DiMenna International Managers, Inc.
          Reference is made to Item 2.A.1, above, for information about such
          individuals.

          None of the above, i.e., Zweig-DiMenna International Limited, Cedric
          B. Moss, Frederick A. Mitchell, Michael D. Riegels, or Zweig-DiMenna
          International Managers, Inc. has, during the last five years, (i) been
          convicted in a criminal proceeding (excluding traffic violations or
          similar misdemeanors) or (ii) been a party to a civil proceeding of a
          judicial or administrative body of competent jurisdiction and as a
          result of such proceeding was or is subject to a judgment, decree or
          final order enjoining future violations of, or prohibiting or
          mandating activities subject to, Federal or State securities laws or
          finding any violation with respect to such laws.

C.   Zweig-DiMenna International Managers, Inc., investment manager for a
     foreign discretionary account. Reference is made to Item 2.B.4, above, for
     information about Zweig-DiMenna International Managers, Inc. and its
     officers, directors and stockholders.

     None of the above, i.e., Zweig-DiMenna International Mangers, Inc., Martin
     E. Zweig, Joseph A. DiMenna, Brenda M. Earl, Carol R. Whitehead or Jeffrey
     R. Perry has, during the last five years, (i) been convicted in a criminal
     proceeding (excluding traffic violations or similar misdemeanors) or (ii)
     been a party to a civil proceeding of a judicial or administrative body of
     competent jurisdiction and as a result of such proceeding was or is subject
     to a judgment, decree or final order enjoining future violations of, or
     prohibiting or mandating activities subject to, Federal or State securities
     laws or finding any violation with respect to such laws.

D.   Gotham Advisors, Inc., investment manager for an ERISA plan discretionary
     account. It is incorporated under the laws of the State of Delaware. Its
     principal business address and the address of its principal office is 900
     Third Avenue, New York, New York 10022. Dr. Martin E. Zweig is the sole
     director, and Dr. Zweig and Mr. Joseph A. DiMenna are the principal
     officers, of Gotham Advisors, Inc. Dr. Zweig, Mr. DiMenna and Ms. Brenda M.
     Earl are the stockholders of Gotham Advisors, Inc. Reference is made to
     Item 2.A.1, above, for information about such individuals.

     None of the above, i.e., Gotham Advisors, Inc., Martin E. Zweig, Joseph A.
     DiMenna or Brenda M. Earl has, during the last five years, (i) been
     convicted in a criminal proceeding (excluding traffic violations or similar
     misdemeanors) or (ii) been a party to a civil proceeding of a judicial or
     administrative body of competent jurisdiction and as a result of such
     proceeding was or is subject to a judgment, decree or final order enjoining
     future violations of, or prohibiting or mandating activities subject to,
     Federal or State securities laws or finding any violation with respect to
     such laws.
<PAGE>
 
E.   Zweig/Glaser Advisers is an investment adviser for mutual funds. It is a
     partnership organized under the laws of New York. Glaser Corp., a Delaware
     corporation controlled by Mr. Eugene J. Glaser, and Zweig Management Corp.,
     a Delaware corporation controlled by Dr. Martin E. Zweig, are the general
     partners of Zweig/Glaser Advisers. Mr. Glaser is President of Zweig/Glaser
     Advisers, Chairman, Chief Executive Officer and Director of Zweig Series
     Trust, President and Director of Zweig Securities Corp., President of
     Euclid Advisors LLC, and Director of The Zweig Fund, Inc. Reference is made
     to Item 2.A.1, above, for information about Dr. Zweig. The principal
     business and office address of Zweig/Glaser Advisers, Zweig Management
     Corp. and Glaser Corp. is 900 Third Avenue, New York, New York 10022.

     None of the above, i.e., Zweig/Glaser Advisers, Glaser Corp., Zweig
     Management Corp., Eugene J. Glaser or Martin E. Zweig has, during the last
     five years, (i) been convicted in a criminal proceeding (excluding traffic
     violations or similar misdemeanors) or (ii) been a party to a civil
     proceeding of a judicial or administrative body of competent jurisdiction
     and as a result of such proceeding was or is subject to a judgment, decree
     or final order enjoining future violations of, or prohibiting or mandating
     activities subject to, Federal or State securities laws or finding any
     violation with respect to such laws.

ITEM 3    SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATIONS

     The securities of Oregon Metallurgical Corporation were purchased at an
     aggregate cost of $23,087,660 with the investment capital of Zweig-DiMenna
     International Limited, Zweig-DiMenna Partners, L.P., the discretionary
     account managed by Zweig-DiMenna International Managers, Inc. (the "ZDIM
     Account"), the discretionary account managed by Gotham Advisors, Inc. (the
     "Gotham Account") and the discretionary accounts managed by Zweig/Glaser
     Advisers (the "Zweig/Glaser Advisers Accounts").  No part of the purchase
     price was made up of borrowed funds or funds otherwise obtained for the
     purpose of acquiring, holding, trading or voting such securities.

ITEM 4    PURPOSE OF TRANSACTION

     Transactions for the purchase of shares of Common Stock (the "Shares") of
     Oregon Metallurgical Corporation (the "Company") were executed by Zweig-
     DiMenna International Limited, Zweig-DiMenna Partners, L.P., the ZDIM
     Account, the Gotham Account and the Zweig/Glaser Advisers Accounts
     (collectively, the "Investors") for investment purposes only.  The
     Investors continue to evaluate their ownership and voting position in the
     Company and may consider the following future courses of action:  (i)
     continuing to hold the Shares for investment; (ii) disposing of all or a
     portion of the Shares in open market sales or in privately negotiated
     transactions; or (iii) acquiring additional shares of common stock in the
     open market or in privately negotiated transactions.  The Investors have
     not as yet determined which of the courses of action specified in this
     paragraph they may ultimately take.  The Investors' future actions with
     regard to this 
<PAGE>
 
     investment in the Company are dependent upon their evaluation of a variety
     of circumstances affecting the Company in the future, including the market
     price of the Company's common stock, the Company's prospects and their own
     portfolios.

     Other than as described above, the Investors do not have any present plans
     or proposals which relate to or would result in any of the following
     (although they reserve the right to develop such plans or proposals):  a)
     the acquisition by any person of additional securities of the Company, or
     the disposition of securities of the Company; b)  an extraordinary
     corporate transaction, such as a merger, reorganization or liquidation,
     involving the Company or any of its subsidiaries; c)  a sale or transfer of
     a material amount of assets of the Company or any of its subsidiaries; d)
     any change in the present board of directors or management of the Company,
     including any plans or proposals to change the number or term of directors
     or to fill any existing vacancies on the board; e)  any material change in
     the present capitalization or dividend policy of the Company; f)  any other
     material change in the Company's business or corporate structure; g)
     changes in the Company's charter, by-laws or instruments corresponding
     thereto or other actions which may impede the acquisition or control of the
     Company by any person; h)  causing a class of securities of the Company to
     be delisted from a national securities exchange or to cease to be
     authorized to be quoted in an inter-dealer quotation system of a registered
     national securities association; i)  a class of equity securities of the
     Company becoming eligible for termination of registration pursuant to
     Section 12(g)(4) of the Securities Exchange Act of 1934; or j)  any action
     similar to those enumerated above.
          
ITEM 5    INTEREST IN SECURITIES OF THE ISSUER

     a.   Aggregate number of shares beneficially owned:

            Zweig-DiMenna International Limited          -            471,300
                                                                             
            Zweig-DiMenna Partners, L.P.                 -            215,400
                                                                             
            ZDIM Account                                 -            106,300
                                                                             
            Gotham Account                               -             59,000
                                                                             
            Zweig/Glaser Advisers Accounts               -             36,500
                                                                             
          Percent of class beneficially owned:                               
                                                                             
            Zweig-DiMenna International Limited          -                2.9%
                                                                              
            Zweig-DiMenna Partners, L.P.                 -                1.3%
                                                                              
            ZDIM Account                                 -                0.6%
<PAGE>
 
            Gotham Account                               -                0.4%
                                                                              
            Zweig/Glaser Advisers Accounts               -                0.2%
                                                                              
 
     b.   Number of shares as to which there is sole power to vote:           
                                                                                
            Zweig-DiMenna International Limited          -            471,300 
                                                                              
            Zweig-DiMenna Partners, L.P.                 -            215,400 
                                                                               
            ZDIM Account                                 -            106,300   
                                                                              
            Gotham Account                               -             59,000 
                                                                              
            Zweig/Glaser Advisers Accounts               -             36,500   
 
          Number of shares as to which there is shared power to vote or to
          direct the vote:
 
            Zweig-DiMenna International Limited          -                  0
                                                                             
            Zweig-DiMenna Partners, L.P.                 -                  0
                                                                             
            ZDIM Account                                 -                  0
                                                                             
            Gotham Account                               -                  0
                                                                             
            Zweig/Glaser Advisers Accounts               -                  0
 
          Number of shares as to which there is sole power to dispose or to
          direct the disposition:
 
            Zweig-DiMenna International Limited          -            471,300 
                                                                              
            Zweig-DiMenna Partners, L.P.                 -            215,400 
                                                                              
            ZDIM Account                                 -            106,300 
                                                                              
            Gotham Account                               -             59,000 
                                                                              
            Zweig/Glaser Advisers Accounts               -             36,500   
<PAGE>
 
          Number of shares as to which there is shared power to dispose or to
          direct the disposition:
 
            Zweig-DiMenna International Limited          -                  0
                                                                             
            Zweig-DiMenna Partners, L.P.                 -                  0
                                                                             
            ZDIM Account                                 -                  0
                                                                             
            Gotham Account                               -                  0
                                                                             
            Zweig/Glaser Advisers Accounts               -                  0 

     c.   Since June 28, 1997, Zweig-DiMenna International Limited, Zweig-
          DiMenna Partners, L.P., the ZDIM Account, the Gotham Account, and the
          Zweig/Glaser Advisers Accounts purchased or sold, as indicated, the
          Shares on the open market on the following dates and at the following
          prices and in the following amounts:
          
            ZWEIG-DIMENNA INTERNATIONAL LIMITED

            DATE        DESCRIPTION OF TRANSACTION

            6/30/97     Purchased 13,800 shares at $27.2750 a share

            7/9/97      Purchased 1,400 shares at $27.50 a share

            7/10/97     Purchased 12,400 shares at $27.50 a share

            7/14/97     Purchased 5,500 shares at $26.75 a share

            7/15/97     Purchased 8,300 shares at $26.7083 a share

            7/18/97     Purchased 41,500 shares at $25.5833 a share

            7/21/97     Purchased 13,800 shares at $24.375 a share

            7/22/97     Purchased 27,700 shares at $24.2875 a share

            7/23/97     Purchased 27,700 shares at $24.5563 a share

            7/24/97     Purchased 13,800 shares at $23.95 a share

            7/25/97     Purchased 13,800 shares at $23.75 a share
<PAGE>
 
            7/28/97     Purchased 13,900 shares at $24.325 a share

            8/8/97      Purchased 13,900 shares at $24.55 a share

            8/13/97     Purchased 9,500 shares at $24.136 a share

            8/28/97     Purchased 27,800 shares at $22.30 a share

            9/2/97      Purchased 14,000 shares at $21.25 a share

            ZWEIG-DIMENNA PARTNERS, L.P.

            DATE        DESCRIPTION OF TRANSACTION

            6/30/97     Purchased 6,200 shares at $27.2750 a share

            7/9/97      Purchased 600 shares at $27.50 a share

            7/10/97     Purchased 5,600 shares at $27.50 a share

            7/14/97     Purchased 2,500 shares at $26.75 a share

            7/15/97     Purchased 3,700 shares at $26.7083 a share

            7/18/97     Purchased 18,700 shares at $25.5833 a share

            7/21/97     Purchased 6,200 shares at $24.375 a share

            7/22/97     Purchased 12,500 shares at $24.2875 a share

            7/23/97     Purchased 12,500 shares at $24.5563 a share

            7/24/97     Purchased 6,200 shares at $23.95 a share

            7/25/97     Purchased 6,200 shares at $23.75 a share

            7/28/97     Purchased 6,200 shares at $24.325 a share

            8/8/97      Purchased 6,200 shares at $24.55 a share

            8/13/97     Purchased 4,200 shares at $24.136 a share

            8/28/97     Purchased 12,500 shares at $22.30 a share

            9/2/97      Purchased 6,200 shares at $21.25 a share
<PAGE>
 
            ZDIM ACCOUNT

            DATE        DESCRIPTION OF TRANSACTION

            6/30/97     Purchased 3,200 shares at $27.2750 a share

            7/9/97      Purchased 300 shares at $27.50 a share

            7/10/97     Purchased 2,900 shares at $27.50 a share

            7/14/97     Purchased 1,300 shares at $26.75 a share

            7/15/97     Purchased 1,900 shares at $26.7083 a share

            7/18/97     Purchased 9,500 shares at $25.5833 a share

            7/21/97     Purchased 3,200 shares at $24.375 a share

            7/22/97     Purchased 6,300 shares at $24.2875 a share

            7/23/97     Purchased 6,300 shares at $24.5563 a share

            7/24/97     Purchased 3,200 shares at $23.95 a share

            7/25/97     Purchased 3,200 shares at $23.75 a share

            7/28/97     Purchased 3,200 shares at $24.325 a share

            8/8/97      Purchased 3,100 shares at $24.55 a share

            8/13/97     Purchased 2,100 shares at $24.136 a share

            8/28/97     Purchased 6,200 shares at $22.30 a share

            9/2/97      Purchased 3,100 shares at $21.25 a share

            GOTHAM ACCOUNT

            DATE        DESCRIPTION OF TRANSACTION

            6/30/97     Purchased 1,800 shares at $27.2750 a share

            7/9/97      Purchased 200 shares at $27.50 a share
<PAGE>
 
            7/10/97     Purchased 1,600 shares at $27.50 a share

            7/14/97     Purchased 700 shares at $26.75 a share

            7/15/97     Purchased 1,100 shares at $26.7083 a share

            7/18/97     Purchased 5,300 shares at $25.5833 a share

            7/21/97     Purchased 1,800 shares at $24.375 a share

            7/22/97     Purchased 3,500 shares at $24.2875 a share

            7/23/97     Purchased 3,500 shares at $24.5563 a share

            7/24/97     Purchased 1,800 shares at $23.95 a share

            7/25/97     Purchased 1,800 shares at $23.75 a share

            7/28/97     Purchased 1,700 shares at $24.325 a share

            8/8/97      Purchased 1,800 shares at $24.55 a share

            8/13/97     Purchased 1,200 shares at $24.136 a share

            8/28/97     Purchased 3,500 shares at $22.30 a share

            9/2/97      Purchased 1,700 shares at $21.25 a share

            ZWEIG/GLASER ADVISERS ACCOUNTS

            DATE        DESCRIPTION OF TRANSACTION

            8/13/97     Sold 200 shares at $25.0625 a share

d.   Not applicable.

e.   Not applicable.
          
ITEM 6    CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
          TO SECURITIES OF THE ISSUER

     None.
<PAGE>
 
ITEM 7    MATERIAL TO BE FILED AS EXHIBITS

     Exhibit A - Joint Filing Agreement among Zweig-DiMenna International
     Limited, Zweig-DiMenna Partners, L.P., Zweig-DiMenna International
     Managers, Inc., Gotham Advisors, Inc., and Zweig/Glaser Advisers.
<PAGE>
 
                                   SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


Date: September 5, 1997


                        ZWEIG-DiMENNA INTERNATIONAL LIMITED


                        By:  Zweig-DiMenna International Managers, Inc.,
                             Investment Manager


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Executive Vice President


                        ZWEIG-DiMENNA PARTNERS, L.P.


                        By:  Zweig-DiMenna Associates LLC,
                             Managing General Partner


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Managing Director of Managing General Partner


                        ZWEIG-DiMENNA INTERNATIONAL MANAGERS, INC.


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Executive Vice President


                        GOTHAM ADVISORS, INC.


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Vice President


                        ZWEIG/GLASER ADVISERS


                        By:  /s/  Marc Baltuch
                           ----------------------------------------
                        Name:  Marc Baltuch
                        Title: First Vice President
<PAGE>
 
                                   EXHIBIT A
                     JOINT FILING AGREEMENT AMONG INVESTORS

     This Joint Filing Agreement is entered into this 5th day of September, 1997
by Zweig-DiMenna International Limited, a British Virgin Islands corporation,
Zweig-DiMenna Partners, L.P., a New York limited partnership, Zweig-DiMenna
International Managers, Inc., a Delaware corporation, Gotham Advisors, Inc., a
Delaware corporation and Zweig/Glaser Advisers, a New York partnership,
collectively the "Investors".  In lieu of filing separate statements on Schedule
13D, the Investors hereby agree to file a joint statement on Schedule 13D
pursuant to Rule 13d-1(f)(1) under the Exchange Act of 1934 with respect to the
Common Stock of Oregon Metallurgical Corporation.

     This Agreement shall be filed as an exhibit to the statement on Schedule
13D filed on behalf of the Investors and constitutes the Investors' consent to
file a joint Schedule 13D.


                        ZWEIG-DiMENNA INTERNATIONAL LIMITED


                        By:  Zweig-DiMenna International Managers, Inc.,
                             Investment Manager


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Executive Vice President


                        ZWEIG-DiMENNA PARTNERS, L.P.


                        By:  Zweig-DiMenna Associates LLC,
                             Managing General Partner


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Managing Director of Managing General Partner


                        ZWEIG-DiMENNA INTERNATIONAL MANAGERS, INC.


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Executive Vice President


                        GOTHAM ADVISORS, INC.


                        By:  /s/  Joseph A. DiMenna
                           ----------------------------------------
                        Name:  Joseph A. DiMenna
                        Title: Vice President


                        ZWEIG/GLASER ADVISERS


                        By:  /s/  Marc Baltuch
                           ----------------------------------------
                        Name:  Marc Baltuch
                        Title: First Vice President


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