Thorpe, William Henry · London, E. & F.N. Spon, limited; New York, Spon & Chamberlain · leaf 151
rposes, the height above ground levelbeing very great. A girder was therefore designed, havingopen latticing at an angle of 60 degrees, with a bottom boomto be below the cross-girders, the top being as high abovethe rails as could be permitted (see Figs. 75 and 76). Atemporary boom was arranged at… … — Cros3 Section —Pig. 7S. The girder for some time carried itself from bearing to bear-ing, with the temporary boom in tension, the deflection beingthen 2 inches. The permanent boom was then put in place,and the girder restored as nearly as was practicable to thecamber it was intended to have when…
Bridges
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