Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 99
cross section. In like manner the crosssection at the next station may be • determined. These twocross sections, if similar, are the bases of a frustum of aquadrangular pyramid whose volume will be the amount ofthe excavation. In case the cross sections are not similar,the computations should be… … Fig. 59 represents the.cross section of an embankment whichis lettered so as to show its relation to the excavation of Fig. 58- RAILROAD SURVEYING 91 SECTION XXIV CURVES Piinciples. When it is necessary to change the directionof a railroad it is done gradually by a curve, usually thearc of a…
Surveying
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