Skinner, Frank W. (Frank Woodward), 1858-1932 · New York, McGraw · leaf 372
of medium steel propor-tioned for maximum stresses of 10,900 lbs. per sq. in. and anultimate minimum strength of 60,000 lbs. per sq. in. Thegirders for each span are 5 ft. apart on centers, and the ties arelaid across their top flanges. The summits of the gradesare near the centers of the longest… … NX 35^ BRIDGE CONSTRUCTION The lengths and positions of the longest spans are determinedby the locations of the supporting single vertical columns whichare set as close together as possible and clear the railroad tracks.This brings them about 94 ft. apart and very much skewed, asshown at points…
Bridges
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