Field-book for railroad engineers. Containing formulas for laying out curves, determining frog angles, levelling, calculating earth-work, etc., etc., together with tables of radii, ordinates deflections, long chords, magnetic variation, logarithms, logarithmic and natural sines, tangents, etc., etc (1877)
Henck, John Benjamin, 1816-1903 · New York : D. Appleton · leaf 41
ed by measuring from D aiistance J. Z) = 72 tan |- 7, and from G a distance B G — R tan. \ I, Example. Given a = 600, 1 = 12°, and F = 8° to find R. Here a = 600 2.778151 i7=6° cos. 9.997614 f 7 = 4° cos. 9.998941 R = 3427.96 2.774706sin. 9.239670 3.535036 22 CIRCULAR CURVES 40. Problem. Given the… … Solution. Find Jirst the auxiliai-y angle A KE = B KF, ivhich inmjbe denoted by K. For this purpose the triangle A E K gives A E: E K= sin. K: sin. E A AT. Therefore E K sin. K = A E sin. E A K ~R cos. A, since EAK = 90^ — A. In like manner, the triangleBFK gives FK sin K= BF sin. FBK = R cos. B.…
Railroad engineering · Ferrovias
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