Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 287
e 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 299 SECTION XXIV CURVES Principles. When it is necessary to change the directionof a railroad it is done gradually by a curve, usually thearc of a…
Trigonometry · Surveying · Navigation
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