INSTRUCTIONS

ON

MODERN AMERICAN

BRIDGE BUILDING.

WITH

PRACTICAL APPLICATIONS AND EXAMPLES,

ESTIMATES OF QUANTITIES, AND
VALUABLE TABLES.

Illustrated by four Plates and Thirty Figures.

BY G.B.N. TOWER,

CIVIL AND MECHANICAL ENGINEER,

_Formerly Chief Engineer U.S. Navy, and late Chandler Instructor in Civil_
_Engineering at Dartmouth College._

BOSTON:

A. WILLIAMS & COMPANY,

135 WASHINGTON STREET.