. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 76. upper stories of uniform height and let the odd amount go to thelowest story, as shown in Figs. 75 and 76. 172. Span. The shorter the span the greater the number oftrestle bents; the longer the span the greater the required strengthof the stringers supporting the floor. Economy demands theadoption of a span that shall make the sum of these require-. FiG. 77. ments a minimum. The higher the trestle the greater the costof each bent, and the greater the span that would be
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 76. upper stories of uniform height and let the odd amount go to thelowest story, as shown in Figs. 75 and 76. 172. Span. The shorter the span the greater the number oftrestle bents; the longer the span the greater the required strengthof the stringers supporting the floor. Economy demands theadoption of a span that shall make the sum of these require-. FiG. 77. ments a minimum. The higher the trestle the greater the costof each bent, and the greater the span that would be all trestles have bents of variable height, but the advan-tage of employing uniform standard sizes is so grea^ that many .1. §173. TRESTLES, 209
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