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
its middle point ilf will be a point on the curve. Bisect £ F andF Bin K and L, join KL, and its middle point iVwill be a point onthe curve. We have now four pairs of third tangents, A G and G M,M H and U E, E K and KN, and NL and L B. Bisect each pair inturn, join the points of bisection, and the… … 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
Railroad engineering · Ferrovias
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