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 82
2 3- 3 7 48 15.0 1 6 2 6 4 0 23.5 0 2 4 3 10 40 24.7 1 5 3 5 7 .U) 51.8 3 3 3 4 10 30 54.0 2 3 5 3 0 25f 52.8 As the given quantities are here arranged, the approximate valuesof Fare all too great; but if the columns n and n and the columns Dand Dwere interchanged, and Fcalculated, the approximntc… … Solution. First Method. Let A B (fig. 33) be the required distanceMeasure a line A C along the bank, and take the angles B A C andACB. Then in the triangle ^1 C Cwe have one side and two angles to nnd A B. 1( A Cis of such a length that an angle A CB = ^D A C can helaid off to a point on the…
Railroad engineering · Ferrovias
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