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 153
formula: — 1. sin, A = 2. COS. A = - . 3. tan. A = 4. cosec. -^-l 5. sec. ■^-l 6. cot. a Given-a. c a, b J., a A,b 10 11 :.4. c Solution ofRijht Triangles (fig. 57).Sought.A,B,l A, B, cB,b,c B, a, cB,a,b Formulae. a sin.^=-, cos. C = -, b=-^ic-\-a){c — a) c c tan. A = :^ , cot. B = -^ , c = ya* -f… … 121314 15 1617 18 Given.A, B, a A, a, b a,b, C a, 6, c A,B,C,aA, b, c a, b, c Sought. Ib B b = sin. B a sin. Bsin. A b sin. Aa Formulae. A — Btan.^ {A — B) ja — b) can, i (A + B) •Ifs=i(a + 6 + c), sm. ^A=^l^^l^.cos4^= J^\ tan.i^= J(f^i^>, •^ y/ be ^ > 5(5 —O) . sin. A = 2 .^A* (5 — a){s — b)…
Railroad engineering · Ferrovias
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
