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 38
R = ^b— ~ —2b— ~ 2b- Therefore ..a = y2 6(A-t-A).Having found a, we have (§ 34) a a Example. Given A = 900, A = 700 and 6 = 8, to find a, a, aim a. Here a = ^2 X 8 (900 + 700) = ^16 X 1600 ^- 160, a =- 8 X 900 X 8 ^^ - ,, 2X700X8 _—jg^j = 90, and a = ^ = 70. REVERSED CURVES. 19 37. Problem. Given… … 3l B K ^^ Fig. 8. Solution. With the given radius run the curve to the point Z), where thetangent D Nbecomes parallel to D K The point D is found thus. Sincethe angle N G K, which is double the angle IIA D {(j 2, II.), is to bemade equal to A KB = K, lay off from FIA the angle HA D=\EMeasure in the…
Railroad engineering · Ferrovias
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