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 88
90. Problem. Given the tangents A C and B C, equal or unequalHg. 39,) and the chord A B, to lay out a parabola by intersections. Fig. 39 … Solution. Bisect A B in D, draw CD, and bisect it in E. Dividethe tangents A Cand B C, the half-chords A D and D B, and the lineCE, into the same number of equal parts ; five, for example. Thenthe intersection M of A a and F G will be a point on the curve. ForFM = I Ca, and Ca = i CE. Therefore.…
Railroad engineering · Ferrovias
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