[File this Transmittal Sheet at the front of the set. It will provide a reference authority for changes, a method of
determining that all amendments have been received, and a check list of pages removed and inserted.]

The pages included in this transmittal are issued to replace specified pages on which changes have been made since issuance of the December 1977 edition of the looseleaf set.

August 13, 1980

THE UNWERSITY
OF MICHIGAN

OCT 17 1950

The vertical lines or circles in the margins of the new pages indicate the portions of text where substitutions, additions, or deletions have been made. The serial numbers, effective date of amendments, page number, and the transmittal number are shown in the bottom margin of the pages transmitted.

Additional descriptive information concerning this issuance is given below:

ENGINEERING

1/ Part 241 is published as a separate book and sold on subscription by the Superintendent of Documents: therefore it is not included in this volume