The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ^^sJitJvJtJ^^ ^ UJ^^^^^^^^^^Wss^sAA ?^ ?^ ^T ^^B. ?^ ^jit*^-^ ^-*<ka^ ^ , ^ 4 w ^ ^ y i =1 y^sg&^^^ •2/0 »)<• -sa-. . . ; ^.. Qfo — Fig. 32.—Niagara Falls and Clifton Bridge. — — — zJ^V— ? —^-^ — /so. -. The main girders rest .on the revolving platform, and the, endsof the bridge are circular arcs fitting the fixed roadway. Threearrangements are found: (a)the axis of rotation is on a pier atthe centre of the river and the bridge is equal armed (fig. 33 c), sothat two navigation passages
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The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ^^sJitJvJtJ^^ ^~ UJ^^^^^^^^^^Wss^sAA ?^ ?^ ^T ^^B. ?^ ^jit*^-^ ^-*<ka^ ^ , ^ 4 w ^ ^ y i =1 y^sg&^^^~ •2/0 »)<• -sa-. _ ._. ;_^.. Qfo — Fig. 32.—Niagara Falls and Clifton Bridge. — — — zJ^V— ? —^-^ — /so. -. The main girders rest .on the revolving platform, and the, endsof the bridge are circular arcs fitting the fixed roadway. Threearrangements are found: (a)the axis of rotation is on a pier atthe centre of the river and the bridge is equal armed (fig. 33 c), sothat two navigation passages are opened simultaneously. (6) The axis of rotation-is on oneaTDUtmpnt, and! the bridgeis then usually unequalarmed(fig., 33d), the shorterarm being over the land, (c) In some sing, !! bridgesthe shorter arm is vertical-and the bridge t^rns on a.kind of vertical crane postat-the abutment (fig. 336).(s) Floating Bridges, theroadway being carried onpontoons moored in thestream. The movable-bridge in its closed position must be .proportioned like a fixed.