. A manual of the principles and practice of road-making: comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads . oblique as to lose much of their efficiency. A straimng-piece is therefore interposed between them. Thirty-fivefeet may thus be spanned. For longer stretches, the bolsters, braces, and straining-beams may be combined, as in Fig. 93. The principle ofthis method may be extended to very wide openings. 12 176 THE CONSTRUCTION OF But in many cases supports from below may be objectionable, as exerting too much
. A manual of the principles and practice of road-making: comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and rail-roads . oblique as to lose much of their efficiency. A straimng-piece is therefore interposed between them. Thirty-fivefeet may thus be spanned. For longer stretches, the bolsters, braces, and straining-beams may be combined, as in Fig. 93. The principle ofthis method may be extended to very wide openings. 12 176 THE CONSTRUCTION OF But in many cases supports from below may be objectionable, as exerting too much thrust against the abutments, and being liable to be carried away by freshets,&c. The beams must in such cases be strengthened bysupports from above The simplest form of such is shown in Fig. 94, inwhich the horizontal beam is supported by an upright Fig. 94.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroa, bookyear1853
