Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 243
e area of the trapezoid ABB1 A1 the areas of thetriangles J.J.(7and BBB be deducted, the remainder will bethe area of the cross section. In like manner the cross section at the next station may bedetermined. These two cross sections will be the bases of afrustum of a quadrangular pyramid whose… … Fig. 51 represents the cross section of an embankmentwhich is lettered so as to show its relation to Fig. 50. § 39. Kailroad Curves. When it is necessary to change the direction of a railroad,it is done gradually by acurve, usually the arc ofa circle. Let AB and AO (Fig.52) represent two lines tobe…
Trigonometry · Surveying · Navigation
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