Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 243
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… … RAILROAD CURVES. 71 of curvature will depend on the angle A and the tangent AD.For, in the right triangle ADC, tan 2X4 C=Hence, r- ——-, or tan + ^1 = —AD 2 t t tan-J J.. First Method,
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
