Century Dictionary and Cyclopedia
- n. A bridge in which the support is afforded by girders or beams. At the period of development of railway construction many bridges were built with cast-iron girders; the limit of safe span of such was generally accepted as 40 feet. This limitation, and the treacherous nature of the material, led to the substitution of wrought-iron formed into plates, which were placed vertically and strengthened and stiffened by angle-irons. The latter form of construction culminated in the box-girder bridge or tubular bridge. Bridges with framed girders are more generally called
truss-bridgesor arched-girder bridges. See arched-beam bridge, under bridge, 1.
“-- If a person stand beneath a railway girder-bridge with an open umbrella over his head, when a train is passing, the vibration of the air will be distinctly felt in the hand which grasps the umbrella, because the outspread surface collects and concentrates the waves into the focus of the handle.”
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