<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: [ ]
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CUSIP NO. 45631G-10-6
_____________________________________________________________________________
(1) Names of Reporting Persons Kent D. McElhattan
Corporation
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
_______________________________________________________________________________
(4) Citizenship or Place United States of America
of Organization
_______________________________________________________________________________
Number of Shares (5) Sole Voting Power 991,520*
Beneficially
Owned by Each (6) Shared Voting Power 24,680**
Reporting Person
With (7) Sole Dispositive Power 991,520*
(8) Shared Dispositive 24,680**
Power
_______________________________________________________________________________
(9) Aggregate Amount Beneficially Owned by Each 1,016,200
Reporting Person
_______________________________________________________________________________
(10) Check if the Aggregate Amount in Row (9) Not Applicable
Excludes Certain Shares
_______________________________________________________________________________
(11) Percent of Class Represented by Amount in Row 9 30
_______________________________________________________________________________
(12) Type of Reporting Person IN
(See Instructions)
* See Exhibit A
** See Exhibit B
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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:
----------------------
Kent D. 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.
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Item 4 Ownership:
----------
(a) Amount beneficially owned: 1,016,200*
(b) Percent of class: 30
(c) Number of shares as to
which person has:
(i) Sole power to vote or 991,520*
to direct the vote:
(ii) Shared power to vote 24,680**
or to direct the vote:
(iii) Sole power to dispose or 991,520*
to direct the disposition
of shares:
(iv) Shared power to dispose or 24,680**
to direct the disposition
of shares:
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.
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Item 9 Notice of Dissolution of Group:
-------------------------------
Not Applicable.
Item 10 Certification:
--------------
Not Applicable.
* See Exhibit A
** See Exhibit B
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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/ Kent D. McElhattan
- ----------------------
Kent D. McElhattan
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EXHIBIT A
---------
* Includes 100,480 shares held by various family trusts as to which the
reporting person serves as trustee. The reporting person disclaims
beneficial ownership of such shares.
EXHIBIT B
---------
** Includes 14,400 shares held by a charitable foundation to which the
reporting person serves as a Director, 1,000 shares held by the reporting
person's spouse and 9,280 shares held by children of the reporting person.
The reporting person disclaims beneficial ownership of such shares.
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