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 89
illustration of several of thepreceding methods. Example. Given AC = B C ^ 832 (fig. 40), and -1 B = 1536 tolay out a parabola A EB. We here find CD = 320. To begin withthe method by tangent deflections (§ 85), divide the tangent A C into C E ^(\0 eight equal parts. Then a = —^ = -wr = 2.5. Lay off… … find a new tangent at E, by bisecting A Cand B C {^ 89), and draw-ing KL through the points of bisection. Divide the new tangentKE =^ ^ AD ^ 384 into four equal parts, and lay oflT from KE the RADIUS OF CURVATURE. 71 same tangent deflections as were laid off from .fi iiT, namely, 3/5-22.5 A^6 = 10,…
Railroad engineering · Ferrovias
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