suspension bridge

A bridge sustained by flexible supports secured at each extremity. The points of support are the tops of strong pillars or small towers, erected for the purpose at each extremity of the bridge. Over these pillars the chains pa , and are attached behind them to rocks or ma ive frames of iron firmly secured underground. These ma es of masonry are named anchorages. The flooring is connected with the chains by means of strong, upright iron rods. Menai Suspension-bridge. ( In half elevation.) a. One of the piers, having ma ive iron saddle on top, seated on rollars for free motion. b. c. Extreme stonework and arches on the Angle sea coast. d. Backstays, 3952 which are allowed room for expansion and contraction; these movements being a isted by rollers at angles, the backstays themselves being carried through tunnels in subterranean wedged-shaped ma es of masonry, and firmly bolted in the rock. e. Roadway, stiffened to prevent oscillation, of which there are two kinds in suspension bridges-horizontal and vertical; thus a heavy load at e above it, at the same time the center of the roadway will will cause a depre ion and pull down the curved chain rise. f. f. Vertical rods, an inch square, supporting the sleepers in the flooring of the roadway IMG:content-0642.png:[blocks in formation] ent rods from levers above, in contra-distinction to the usual platform-scales, whose levers are beneath. sŭs-pěn'-sive, a. [ Eng.suspens ( e ); -ive.] Su ex-marble