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 85
he curve at the extremity of a middle ordinate,is parallel to the chord of that ordinate. Thus MF, tangent to thecur\ e at E, is parallel to A B. rs PARABOLIC CURVES. V. If any two tangents, as yl C and B C, be bisected in M and /ihe line il/F, joining the points of bisection, will be a new… … Soluticm. Bisect A B in A and measure CD and the angle A CD^or calculate CD* and A CD from the original data. Divide the tan-gent A C into any number n of equal parts, and call the deflectionJM/for the first point a. Then {§ 84, II.) the deflection for the sec-ond point will be T M = 4 a, for the…
Railroad engineering · Ferrovias
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