INDUSTRIAL SCIENTIFIC CORP
SC 13G/A, 1998-02-13
INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20059
                                        
                                        
                                  SCHEDULE 13G
                   Under the Securities Exchange Act of 1934
                                (Amendment No. 4)
                                        


NAME OF ISSUER:  Industrial Scientific Corporation


TITLE OF CLASS OF SECURITIES:  Common Stock


CUSIP NUMBER:  45631G-10-6


Check the following box if a fee is being paid with this statement:  [  ]


                                  Page 1 of 7
<PAGE>
 
CUSIP NO.  45631G-10-6
________________________________________________________________________________
(1)   Names of Reporting Persons                   Kenton E. McElhattan

      SS or IRS Identification Nos.                  SSN:  ###-##-####
      of Above Person
________________________________________________________________________________
(2)   Check the Appropriate Box (See Instructions): (a)_________________________
       if a Member of a Group

 
           (See Instructions)
           (b)_______________X________________
               Membership in any group is
                disclaimed
- --------------------------------------------------------------------------------
(3)        SEC Use Only                                United States of America


- --------------------------------------------------------------------------------
(4)        Citizenship or Place                        United States of America
           of Organization


- --------------------------------------------------------------------------------
Number of Shares           (5)  Sole Voting Power                       681,960
Beneficially
Owned by Each              (6)  Shared Voting Power                     764,400*
Reporting Person 
With                       (7)  Sole Dispositive Power                  681,960
 
                           (8)  Shared Dispositive                      764,400*
                                Power
________________________________________________________________________________
(9)   Aggregate Amount Beneficially Owned by Each
      Reporting Person                                                1,446,360


________________________________________________________________________________
(10)  Check if the Aggregate Amount in Row (9)
      Excludes Certain Shares                                    Not Applicable


________________________________________________________________________________
(11)    Percent of Class Represented by Amount in Row 9                    42.9


________________________________________________________________________________
(12)    Type of Reporting Person                                             IN
        (See Instructions)

*  See Exhibit A




                                  Page 2 of 7
<PAGE>
 
CUSIP NO.  45631G-10-6

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                        
                                  SCHEDULE 13G
                (Under the Securities and Exchange Act of 1934)
                                        
Item 1(a)      Name of Issuer:
               -------------- 

                   Industrial Scientific Corporation

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

                   1001 Oakdale Road
                   Oakdale, PA  15071

Item 2(a)      Name of Person Filing:
               ----------------------

                   Kenton E. McElhattan

Item 2(b)      Address of Principal Business Office:
               -------------------------------------

                   Industrial Scientific Corporation
                   1001 Oakdale Road
                   Oakdale, Pennsylvania 15071

Item 2(c)      Citizenship:
               ------------

                   United States of America

Item 2(d)      Title of Class of Securities:
               -----------------------------

                   Common Stock, Par Value $.01 Per Share

Item 2(e)      CUSIP Number:
               -------------

                   45631G-10-6

Item 3         Statement filed pursuant to Rules 13d-1(b), or
               13d-2(b).

                   Not Applicable.



                                  Page 3 of 7
<PAGE>
 
Item 4         Ownership:
               ----------

               (a) Amount beneficially owned:  1,446,360*

               (b) Percent of class:  42.9
 
               (c) Number of shares as to
                   which person has:
 
                   (i)   Sole power to vote or
                         to direct the vote:                   681,960

                   (ii)  Shared power to vote
                         or to direct the vote:                764,400*

                   (iii) Sole power to dispose or
                         to direct the disposition
                         of shares:                            681,960

                   (iv)  Shared power to dispose or to
                         direct the disposition
                         of shares:                            764,400*

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 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.



                                  Page 4 of 7
<PAGE>
 
Item 10        Certification:
               --------------

                     Not Applicable.


*  See Exhibit A











                                  Page 5 of 7
<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:  February 13, 1998



/s/ Kenton E. McElhattan
- ------------------------
Kenton E. McElhattan








                                  Page 6 of 7
<PAGE>
 
                                 EXHIBIT A
                                 ---------


*    Includes 750,000 shares held by Florence L. McElhattan, the wife of
     reporting person, and 14,400 shares held in a charitable foundation of
     which the reporting person is a Director.  The reporting person disclaims
     beneficial ownership of such shares.











                                  Page 7 of 7


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