00 hinged arched iron bridges and roofs have been .con- iron columns to support the chains or girders ; as at lb. per square inch, having 20 to 30 per cent elongation Frankfort, Pittsburg, Wheeling, Brooklyn, Niagara, structed ; a notable example being the roof of the in 20 em. = 7°87 inches. The… … access to summits and bases, and, on each side a footway 2°06 meters in fact, to all parts, of the pillars, = 6°75 feet ; the clear distance be- tween railings being 11°12 meters = for the purpose of inspection, 36°5 feet. Provision is made to attach brackets tween 30,000 to 40,000 lb. per square…
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