SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 1 )*


                                 SPX Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                    784635104
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                            with a copy to:
Alexander J. Roepers                        Allen B. Levithan
Atlantic Investment Management, Inc.        LOWENSTEIN SANDLER PC
666 Fifth Avenue                            65 Livingston Avenue
New York, New York  10103                   Roseland, New Jersey  07068
(212) 484-5050                              (973) 597-2500
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 August 2, 2004
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule l3G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), (f) or (g), check the following box [ ].

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all  exhibits.  See Rule l3d-7(b) 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).


CUSIP NO. 784635104 - -------------------------------------------------------------------------------- 1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons (entities only): Atlantic Investment Management, Inc. - -------------------------------------------------------------------------------- 2) Check the Appropriate Box if a Member of a Group (See Instructions): (a) (b) ------- ------ - -------------------------------------------------------------------------------- 3) SEC Use Only - -------------------------------------------------------------------------------- 4) Source of Funds (See Instructions): AF, OO - -------------------------------------------------------------------------------- 5) Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e): Not Applicable - -------------------------------------------------------------------------------- 6) Citizenship or Place of Organization: Delaware - -------------------------------------------------------------------------------- Number of 7) Sole Voting Power: 4,613,400* ---------------------------------------- Shares Beneficially 8) Shared Voting Power: 0 ---------------------------------------- Owned by Each Reporting 9) Sole Dispositive Power: 4,613,400* ---------------------------------------- Person With: 10) Shared Dispositive Power: 0 ---------------------------------------- - -------------------------------------------------------------------------------- 11) Aggregate Amount Beneficially Owned by Each Reporting Person: 4,613,400* - -------------------------------------------------------------------------------- 12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions): Not Applicable - -------------------------------------------------------------------------------- 13) Percent of Class Represented by Amount in Row (11): 6.06%* - -------------------------------------------------------------------------------- 14) Type of Reporting Person (See Instructions): IA - -------------------------------------------------------------------------------- * Includes: (i) 895,500 shares (1.2%) of the Issuer's common stock, par value $10.00 per share ("Shares"), beneficially owned by AJR International (BVI), Inc., a British Virgin Islands company, (ii) 472,850 Shares (0.6%) beneficially owned by Quest Capital Partners, L.P., a Delaware limited partnership, (iii) 1,311,600 Shares (1.7%) beneficially owned by Cambrian Fund (BVI), Ltd., a British Virgin Islands company, (iv) 569,750 Shares (0.7%) beneficially owned by Cambrian Partners, L.P., a Delaware limited partnership, (v) 1,357,700 Shares (1.8%) held in several Managed Accounts ("Managed Accounts") and (vi) 2,400 Shares (0.003%) beneficially owned by Atlantic Investment Management's 401k/Profit Sharing Plan. In addition, the sole shareholder of the Reporting Person, Mr. Alexander J. Roepers, beneficially owns 3,600 Shares (0.005%). The Reporting Person, serving as the investment advisor of the foregoing parties and the Managed Accounts, has sole voting and dispositive power over all Shares beneficially owned by such parties or held in the Managed Accounts. See Items 2 and 5 for additional details.

Item 2. Identity and Background ----------------------- Item 2 is hereby restated in its entirety as follows: (a) This statement is filed by Atlantic Investment Management, Inc., a Delaware corporation (the "Reporting Person"), with respect to 4,613,400 Shares over which the Reporting Person has sole dispositive and voting power by reason of serving as the investment advisor to (i) AJR International (BVI) Inc., a British Virgin Islands company ("AJR"), (ii) Quest Capital Partners, L.P., a Delaware limited partnership ("Quest"), (iii) Cambrian Fund (BVI), Ltd., a British Virgin Islands company ("Cambrian Fund"), (iv) Cambrian Partners, L.P., a Delaware limited partnership ("Cambrian Partners"), (v) several managed accounts (the "Managed Accounts"), (vi) Atlantic Investment Management's 401k/Profit Sharing Plan (the "Plan") and (vii) Alexander J. Roepers, the president and sole shareholder of the Reporting Person. Mr. Roepers also serves as the general partner of Quest and Cambrian Partners. (b) The business address of the Reporting Person and Mr. Roepers is 666 Fifth Avenue, 34th Floor, New York, New York 10103. (c) The principal business of the Reporting Person is that of an investment advisor engaging in the purchase and sale of securities for investment with the objective of capital appreciation on behalf of AJR, Quest, Cambrian Fund, Cambrian Partners, the Managed Accounts, the Plan and Mr. Roepers. The principal occupation of Mr. Roepers is serving as the president and managing officer of the Reporting Person. (d) Neither the Reporting Person nor Mr. Roepers has, during the past five (5) years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). (e) Neither the Reporting Person nor Mr. Roepers has, during the past five (5) years, been a party to any civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is now 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. (f) Mr. Roepers is a citizen of The Netherlands. Item 3. Source and Amount of Funds or Other Consideration ------------------------------------------------- Item 3 is hereby restated in its entirety as follows: The Shares purchased by the Reporting Person on behalf of AJR, Quest, Cambrian Fund, Cambrian Partners, the Managed Accounts and the Plan were purchased with the investment capital of such entities and accounts. The Shares purchased individually by Mr. Roepers were purchased with the personal funds of Mr. Roepers. The aggregate amount of funds used in making the purchases reported on this Schedule 13D was $30,327,041.93.

Item 5. Interest in Securities of the Issuer ------------------------------------ Item 5 is hereby restated in its entirety as follows: (a) Based upon the information contained in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 2, 2004, there were issued and outstanding 76,112,978 Shares as of July 29, 2004. (b) The Reporting Person does not directly own any Shares. The Reporting Person has entered into an investment advisory agreement with each of AJR, Quest, Cambrian Fund, Cambrian Partners, the Managed Accounts and the Plan, pursuant to which the Reporting Person has investment authority with respect to the securities held by such entities or in such accounts. Such power includes the power to dispose of and the power to vote the Shares. By reason of the provisions of Rule 13d-3 of the Securities Exchange Act of 1934, as amended, the Reporting Person is deemed to be the beneficial owner of the Shares held by such entities and accounts. In addition, the Reporting Person has sole dispositive and voting power over the 3,600 Shares beneficially owned by Mr. Roepers. Accordingly, the Reporting Person is deemed the beneficial owner of 4,613,400 Shares, or 6.06% of the outstanding Shares. (c) The following table details the transactions by the Reporting Person, on behalf of AJR, Quest, Cambrian Fund, Cambrian Partners, the Managed Accounts and the Plan, as well as transactions by Mr. Roepers, in the Shares during the past sixty (60) days: Date Quantity Price Type of Transaction ---- -------- ----- ------------------- 08/02/04 300,000 $37.8300 Open Market Purchase 08/03/04 169,800 $36.9906 Open Market Purchase 08/04/04 170,500 $36.0055 Open Market Purchase 08/05/04 150,000 $36.7180 Open Market Purchase 08/06/04 29,000 $36.2207 Open Market Purchase Except for the transactions listed above, neither the Reporting Person, any entity for which the Reporting Person serves as investment advisor, nor any person or entity controlled by the Reporting Person, nor Mr. Roepers has traded Shares during the past sixty (60) days.

SIGNATURE After reasonable inquiry and to the best of the undersigned's knowledge and belief, the undersigned hereby certifies that the information set forth in this statement is true, complete and correct. August 9, 2004 ATLANTIC INVESTMENT MANAGEMENT, INC. By: /s/ Alexander J. Roepers ----------------------------------- Alexander J. Roepers, President ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).