SI HANDLING SYSTEMS INC
SC 13G/A, 1999-02-08
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. 2 )*



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


     SI Handling Systems, Inc. Common Stock par value $1.00  
- --------------------------------------------------------------------------------
                        (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    S.S. or 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            
                          369,232
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          
     OWNED BY             0  
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             
                          601,305
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      601,305
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11           
      16.1%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
      IA
- ------------------------------------------------------------------------------

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
                                                                 PAGE 3 OF 4

SCHEDULE 13G                          
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, Pennsylvania 18040.

Item 2.

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

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

         (c)       The state of organization is Pennsylvania.

         (d)       The title of class of security is common stock par value
                   $1.00.

         (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 601,305 shares of common
                   stock.

         (b)       The percent of class is 16.1%.

         (c)(i)    The number of shares as to which Emerald Advisers, Inc. has
                   sole voting power is 369,232.

         (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 601,305.

         (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.


                                                      1/21/99          
                                        -------------------------------------
                                                        Date

                                                     /s/ Scott Rehr
                                        ----------------------------------------
                                                        Signature

                                        Scott L. Rehr, Senior Vice President


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