laced on either the top or bottom of the bridge . If on the top , the girder is generally surmounted with a railing ; but when the roadway is between the main girders , no railing is required . If a footway is desired , it is carried on each side by cantilevers or prolongations of the cross girders… … Fig . 705 . — Wrought - iron Lattice Bridge . Roadway at Top . Fig . 706 . — Wrought - iron Trellis Bridge . Roadway at Bottom . plated parallel girders . The cost , however , is somewhat greater , owing to the plates requiring to be cut to waste , and the angle iron requiring setting and forging .…
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