SI HANDLING SYSTEMS INC
SC 13G, 1998-02-17
CONSTRUCTION, MINING & MATERIALS HANDLING MACHINERY & EQUIP
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                  SCHEDULE 13G

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



 SI Handling Systems, Inc.
- -------------------------------------------------------------------------------
                               (Name of Issuer)

 SI Handling Systems, Inc. Common Stock par value 1.
- -----------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   784255101
                     -------------------------------------
                                (CUSIP Number)



*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).

                               Page 1 of 4 pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 784255101                   13G                PAGE 2 OF 4 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Emerald Advisers, Inc.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      Pennsylvania

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            305,993  
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             513,743
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      513,743

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
      13.5%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
      IA

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 2 of 4 pages

<PAGE>
 
Schedule 13G                                       Page 3 of 4
Emerald Advisers, Inc.

Item 1.

     (a)      The name of the issuer is SI Handling Systems, Inc.

     (b)      The address of issuer's principal executive offices is 600 Keubler
              Road, Easton, PA 18040.

Item 2.

     (a)      The name of the person filing is Emerald Advisers, Inc.

     (b)      The address of the principal business office of person filing is
              1857 William Penn Way, Lancaster, Pennsylvania 17601.

     (c)      The state of organization is Pennsylvania.

     (d)      The title of the class of security is common stock par value 1.

     (e)      The CUSIP number is 784255101.

Item 3.

     (e)      The person filing is an Investment Adviser registered under
              section 203 of the Investment Advisers Act of 1940.

Item 4.

     (a)      The amount beneficially owned is 513,743.

     (b)      The percent of class is 13.5%

     (c)(i)   The number of shares as to which Emerald Advisers, Inc. has sole
              voting power is 305,993.

     (c)(ii)  The number of shares as to which Emerald Advisers, Inc. has shared
              voting power is 0.

     (c)(iii) The number of shares as to which Emerald Advisers, Inc. has sole
              dispositive power is 513,743.

     (c)(iv)  The number of shares as to which Emerald Advisers, Inc. holds
              shared dispositive power is 0.
<PAGE>
 
Schedule 13G                                       Page 4 of 4
Emerald Advisers, Inc.

Item 5.

     Not applicable.

Item 6.

     Other persons have the right to receive and/or the power to direct the
receipt of dividends from, and the proceeds from the sale of, such securities.

Item 7.

     Not applicable.

Item 8.

     Not applicable.

Item 9.

     Not applicable.

Item 10.

     By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were acquired in the ordinary course of
business and were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purposes or effect.

                                   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



                                        --------------------------------------
                                                        Signature

                                        Scott L. Rehr, Senior Vice President

 


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