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The Daily Dispatch: November 7, 1860., [Electronic resource], Railroad bridges. (search)
ich the exterior is painted as soon as the timber is perfectly seasoned; the seasoned checks cemented, and other exposed points protected, so as almost completely to secure the timber from the effects of the weather and preserve it from premature decay. Bridges built, as they often are, of inferior timber, with little or no mechanical skill and of light proportions, may eke out from eight to fifteen years, according to circumstances and the care bestowed in repairs. Trestle bridges, costing on an average, and aside from their foundation masonry, about eight dollars a lineal foot for single track, are found to hold out for about six years only. Stringer bridges --large timber girders supported at the ends by masonry and at intermediate points by braces below, resting upon the abutments — cost about five dollars a running foot, and appear to last about eight years. All these estimates are irrespective of the contingency of fire, to which all wooden structures are constantly exposed.