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 49
s of x and y found above, wa have R = q^y^r ^^^ ^ = M=^M= T< • Exampie. Given a = 500, T = 250, and T = 290, to find x and yHere a + 7 + I = 500 + 250 + 290 = lOtO ; whence a: = 500 ><250 -r 1040 = 120.19, and ^ = 500 X 290 -r- 1040 = 139.42. 48. Probleaea. Given the tangents Al = T, Bl… … ^ututiirn. feince IDG = lGD = hl^yf& have ID = 1 G. Rep■escnt the line Ih ~ 1 Ghy x. Then if the perpendicular IHhe let ♦ The radii of an oval of given length and breadth, or of a three-centre arch of givenepan and rise, may also be found from these formulae In these cases A-^ B = 90-, and the…
Railroad engineering · Ferrovias
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