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Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
ength of 35 feet 4 inches at top of caisson, and a width of 7 feet 3 inches at top of cut-stone. Beside the piers which carry the superstructure, there are at the draw 2 guard-piers, one above and one below, which serve to protect the draw from injury and to aid vessels in passing. It is substantially the Howe truss. The bridge across the entrance to the Niagara River, at Black Rock, designed for the use of the Grand Trunk, Great Western, Canada Southern, New York Central, Erie, and New York West Shore, and Chicago Railways, has a total length of 3,550 feet, 1,300 feet of which are over trestle-work upon Squaw Island, 450 feet over Black Rock Harbor, and the remainder over the main branch of the river. The river portion of the bridge has 8 piers and 2 abutments. Owing to the depth of water, from 12 to 45 feet, and a current of from 5 1/2 to 10 miles an hour, varying with the state of the wind, considerable difficulty was experienced in the construction of the piers, which wer