UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549

                                  Schedule 13G

                    Under the Securities Exchange Act of 1934
                             (Amendment No.   14  )*

                             A.O. SMITH CORPORATION    
                                (Name of Issuer)

                      Class A Common Stock, $5.00 par value    
                         (Title of Class of Securities)

                                   831-865-10-0  
                                 (CUSIP Number)


   Check the following box if a fee is being paid with this statement /_/. 
   (A fee is not required only if the filing 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.)

   *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 the disclosures provided in a prior cover page.

   The information required in 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).

                        (Continued on following page(s))
   

   CUSIP No. 831-865-10-0              13G


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

              Smith Investment Company                    IRS ID #39-6043416 
              Lloyd B. Smith                                  SS ####-##-####
              Arthur O. Smith                                 SS ####-##-####

     2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                            (a)  //          
              Not Applicable                                (b)  //          

     3   SEC USE ONLY


     4   CITIZENSHIP OR PLACE OF ORGANIZATION

              Smith Investment Company                        - Delaware     
              Lloyd B. Smith                                  - United States
              Arthur O. Smith                                 - United States

                     5  SOLE VOTING POWER
      NUMBER OF
                             Smith Investment Company - 5,378,168
        SHARES
                     6  SHARED VOTING POWER
     BENEFICIALLY
                              -0-
       OWNED BY                
                     7  SOLE DISPOSITIVE POWER
         EACH
                             Smith Investment Company - 5,378,168
      REPORTING

        PERSON

         WITH

                    8   SHARED DISPOSITIVE POWER
      
                               -0-
 
    9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              Smith Investment Company                        - 5,378,168    
              Lloyd B. Smith                                  - 0            
              Arthur O. Smith                                 - 0            

    10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES*

              Lloyd B. Smith                                              /X/
              Arthur O. Smith                                             /X/

    11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

              Smith Investment Company                        - 88.4%        
              Lloyd B. Smith                                  - 0%           
              Arthur O. Smith                                 - 0%           


    12   TYPE OF REPORTING PERSON*

              Smith Investment Company                        - CO           
              Lloyd B. Smith                                  - IN           
              Arthur O. Smith                                 - IN           

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
   

   Item 1(a).      Name of Issuer:

             A.O. Smith Corporation


   Item 1(b).      Address of Issuer's Principal Executive Offices:

             11270 West Park Place
             Milwaukee, Wisconsin  53224

   Item 2(a).      Name of Person Filing:

             Smith Investment Company I.R.S. I.D. No. 39-6043416
             L.B. Smith -- S.S. No. ###-##-####
             Arthur O. Smith -- S.S. No. ###-##-####

   Item 2(b).      Address of Principal Business Office or, if none,
                Residence:

             Smith Investment Company
             11270 West Park Place
             Milwaukee, Wisconsin  53224

             L.B. Smith
             11270 West Park Place
             Milwaukee, Wisconsin  53224

             Arthur O. Smith
             11270 West Park Place
             Milwaukee, Wisconsin  53224


   Item 2(c).      Citizenship:

             Delaware -- Smith Investment Company
             United States -- L.B. Smith and Arthur O. Smith


   Item 2(d).      Title of Class or Securities:

             Class A Common Stock, $5.00 par value 


   Item 2(e).      CUSIP Number:

             831-865-10-0


   Item 3.   If this statement is filed pursuant to Rules 13d-1(b), or 13d-
             2(b), check whether the person filing is a:

             Not applicable.


   Item 4.   Ownership:

                  As of December 31, 1993, Smith Investment Company owned
             5,378,168 shares* of A.O. Smith Corporation Class A Common Stock
             or approximately 88.4% of the outstanding stock.  Smith
             Investment Company has sole power to vote and dispose of such
             shares.

                  Mr. Arthur O. Smith is Chairman and Chief Executive Officer
             and a director of Smith Investment Company.  During 1993, Mr.
             Lloyd B. Smith retired as Vice President and a director of Smith
             Investment Company.

                  On December 31, 1993, Arthur O. Smith owned beneficially
             121,845 shares, and his wife owned of record and beneficially
             3,485 shares of the outstanding capital stock of Smith
             Investment Company ("SICO") and 195,730 shares were held in
             various trusts for the benefit of the wife and issue of Arthur
             O. Smith.  On December 31, 1993, Lloyd B. Smith owned
             beneficially 9,502 shares of the outstanding capital stock of
             SICO and 303,503 shares were held in various trusts for the
             benefit of the wife and issue of Lloyd B. Smith.  In addition,
             Messrs. Smith were trustees of various trusts for the benefit of
             persons other than themselves, their wives and issue, which
             trusts held an aggregate of 524,460 shares of the capital stock
             of SICO outstanding on December 31, 1993.  Messrs. Smith have
             shared investment and voting power on all trusts for which they
             are co-trustees.  On all other trusts one or the other shares
             trust powers with at least one other person.  The shares of
             capital stock of SICO held beneficially by Messrs. Smith and
             their wives, together with shares held by Messrs. Smith in trust
             for others comprised 69.5% of the 1,667,635 outstanding shares
             of capital stock of SICO on December 31, 1993.  Messrs. Smith
             disclaim that any of the foregoing interests in the capital
             stock of SICO constitute beneficial ownership of any Class A
             Common Stock of A.O. Smith Corporation.

   *    Of these, 200,000 shares are held by SCAP Corporation, a wholly owned
        subsidiary of Smith Investment Company.

   Item 5.   Ownership of Five Percent or Less of a Class:

             Not applicable

   Item 6.   Ownership of More than Five Percent on Behalf of Another Person:

             Not applicable

   Item 7.   Identification and Classification of the Subsidiary Which
             Acquired the Security Being Reported on By the Parent Holding
             Company:

             Not applicable


   Item 8.   Identification and Classification of Members of the Group:

             Not applicable


   Item 9.   Notice of Dissolution of Group:

             Not applicable


   Item 10.  Certification:

             Not applicable



                                    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.

                                      SMITH INVESTMENT COMPANY



                                      /s/ Arthur O. Smith
                                      Arthur O. Smith, Chairman & CEO 
                                      January 25, 1994



                                      /s/ L. B. Smith
                                      L. B. Smith
                                      January 25, 1994



                                      /s/ Arthur O. Smith
                                      Arthur O. Smith
                                      January 25, 1994