SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
Under the Securities and Exchange Act of 1934
(Amendment No. 6 )
WESTON (ROY F.), INC.
(Name of Issuer)
Common
(Title of Class of Securities)
Date of Event Which Requires Filing of this Statement
December 15, 1998
Check the appropriate box to designate the rule
pursuant to which this Schedule is filed
Rule13d-2(b)
961137106
(CUSIP NUMBER)
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1) Name of Reporting Pioneer
Person Investment
Management Inc
IRS Identification (a/k/a Pioneering
No. of Above Management Corp.)
13-1961193
2) Check the Appropriate Box (a)
of A Member of Group
(See Instructions) (b) X
3) SEC Use Only
4) Citizenship of Place of
Organization Delaware
Number of (5) Sole Voting Power 387300
Shares
Beneficially Owned (6) Shared Voting 0
Power
by Each Reporting
Person With (7) Sole Dispositive 387300
Power
(8) Shared 0
Dispositive
Power
9) Aggregate Amount Beneficially 387300
Owned by Each
Reporting Person
10 Check if the aggregate
Amount in Row (9) Exclude Certain
Shares (See
Instructions)
11 Percent of Class Represented
By Amount in Row 9. 4.93%
12) Type of Reporting
Person (See Instructions) IA
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Item 1(a) Name of Issuer.
WESTON (ROY F.), INC.
Item 1(b) Address of Issuer's Principal Executive Office's
Mr.William C. MeczugheyChief Financial Officer
WESTON (ROY F.), INC.
1 Weston Way
West Chester, PA 193801499
Item 2(a) Name of Person Filing.
Pioneering Investment Management, Inc. a/k/a
Pioneering Management Corp.
Item 2(b) Address of Principal Business Office:
60 State Street, Boston, MA 02109
Item 2(c) Citizenship:
State of Delaware - Pioneer Investment Management ,
Inc. a/k/a Pioneering Management Corp
Item 2(d) Title of Class of Securities.
Common Stock
Item 2(e) CUSIP Number.
961137106
Item 3 The person filing this statement pursuant to Rule 13-1(b)
Or 13d-2 is:
(d) Investment Adviser registered under Section 203 of
the Investment Advisers Act of 1940.
<PAGE>
Item 4. Ownership
(a) Amount Beneficially Owned 387300
(b) Percent of Class 4.93%
(c) Number of shares as to which such person has
(i) sole power to vote or to direct the vote 387300
(ii) shared power to vote or to direct vote 0
(iii) sole power to dispose or to direct disposition of 387300
(iv) shared power to dispose or to direct disposition 0
Item 5. Ownership of Five Percent or Less of a Class.
If this statement is being filed to report the fact that as of the date
Hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check here: X
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
Inapplicable.
Item 7. Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported On By the Parent Holding Company.
Inapplicable.
Item 8. Identification and Classification of Members of the Group.
Inapplicable.
Item 9. Notice of Dissolution of the Group.
Inapplicable.
<PAGE>
Item 10. Certification.
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 transactions having
such purposes or effect.
After reasonable inquiry and to the best of my knowledge and believe, I
certify that the information set forth in this statement is true, complete and
correct.
December 14, 1998
Date
s/Robert P. Nault
Signature
Robert P. Nault
Assistant Secretary
Type Name and Title
