TRANSACTIONS OF THE AMERICAN SOCIETY OF CIVIL ENGINEERS

(INSTITUTED 1852)

VOL. LXVIII

SEPTEMBER, 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.

NEW YORK

PUBLISHED BY THE SOCIETY

1910

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.

Note.—This Society is not responsible, as a body, for the facts and opinions advanced in any of its publications.