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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
11 feet. The longest bridge in England is that built by Bernard Abbot of Burton, over the Trent at Burton, in the twelfth century. It is all of squared freestone, is strong and lofty, is 1,545 feet in length, and consists of 34 arches Most of the 339 bridges of Venice are of stone. The Union arch of the Washington Aqueduct over Cabin John Creek has 220 feet span, is 450 feet long, 20 feet 4 inches wide; the elevation of the roadway above the bed of the stream is 100 feet. Cost to May, 1872, $237,000. Stone-cem′ent. A hard composition of the nature of mortar, which will harden and form a watertight joint. A mineral compound for uniting stone and resisting water is male by mixing 19 lbs. of sulphur with 42 lbs. of powdered glass or stone ware Over a gentle heat the sulphur melts, and the whole is stirred till a homogeneous mass is obtained, when it may be run into molds. It melts at 248° Fah., and becomes hard as stone, and will resist boiling at 230° Fah. It may be