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 35
n. Solution. I/ay out the first portion of the curve from A to B Cfig. 5),by one of the usual methods. Find B F, the tangent to A B at thepoint B (§ 16 or ^ 21). Then B F will be tlie tangent also of the sec-ond portion B C oi a reversed, or Zi D of a compound curve, and fromthis tangent cither of… … t\ Demonstration. Let A CB (fig. 6) be a reversed curve, uniting tinparallel tangents HA and B K, having its radii equal or unequal, andreversing at C. If now the chords A Cam] CB are drawn, we haveto prove that these chords are in the same straight line. The radiiE C and C F, being perpendicular…
Railroad engineering · Ferrovias
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