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 105
d to the height at every station on A C, andij denotes what is added to the height at every station on CB],huisince CB is a descending grade, the C[uantity added is a minus quan-tity, and (/ will therefore be negative. The parabola furnishes a verysimple method of putting in a vertical curve. 107.… … Solution. Let A E B he the required parabola. Through B and Cdraw the vertical lines FK and C H, and produce A C to meet FKin F. Through .1 draw the horizontal line A K, and join A B, cut-ting C H in D. Then, since the distance from C to A and B is meas-ured horizontally, we have A H =^ HK. and…
Railroad engineering · Ferrovias
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