Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 531
he bridge isadjusted to the load on the boat, and by which a part of the weight of thebridge is held, the upper ends of the chains being attached to the frame over-34 514 ENGINEERING DRAWING. head. The details (Figs. 1227 and 1228) in section and plan explain the con-struction of the land-hinge; a… … Fig. 1231. For motives of economy in cost or space, it has become very common amongengineers to construct bridges with frequent wrought-iron piers or trestles ofgreat height rather than extended truss spans; one of the most remarkable ofthese is the Kinzua Viaduct, of which Fig. 1229 represents a…
Mechanical drawing
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