DESIGNED for the Use of Students, ENGINEERS, AND CONTRACTORS

BY

J. B. JOHNSON, C. E.

PROFESSOR OF CIVIL ENGINeering, WashiNGTON UNIVERSITY, ST. Louis, Mo.
MEMBER OF THE INSTITUTION OF CIVIL ENGINEERS.

MEMBER OF THE AMERICAN SOCIETY OF CIVIL ENGINEERS.

MEMBER OF THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS, ETC.

FIRST EDITION.

ENGINEERING NEWS PUBLISHING CO., NEW YORK.

1895.

1

さと

62036

Entered according to Act of Congress in the year eighteen hundred and ninety-five, by

J. B. JOHNSON, C. E.,

in the office of the Librarian of Congress, Washington, D. C.