Skinner, Frank W. (Frank Woodward), 1858-1932 · New York, McGraw · leaf 318
lly, varying from 30 to 55 ft. inextreme cases. Transversely they are all 26 ft. apart on thetwo-track section of division No. 2, and 30 ft. apart on the four-track section of division No. 4. The standard columns are made with two 15-in. channels withtheir flanges turned in and their webs riveted… … 302 BRIDGE CONSTRUCTION seated, about i J ft. below the surface of the street, on concretefootings to which they are secured by four i^-in. vertical bolts4 ft. long- with screw ends. The lower nuts take bearing againsthorizontal anchor plates built into the concrete, and the uppernuts, at about the…
Bridges
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