TRANSACTIONS
OF THE
AMERICAN SOCIETY
OF
CIVIL ENGINEERS
(INSTITUTED 1852)
VOL. LXX
DECEMBER, 1910
Edited by the Secretary, under the direction of the Committee on Publications.
Reprints from this publication, which is copyrighted, may be made on condition that the full title of Paper, name of Author, and page reference are given.
Entered according to Act of Congress, in the year 1910, by the American Society of Civil Engineers, in the Office of the Librarian of Congress, at Washington.