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 68
CD: AC. Bnt CAD = ^AOD = ili^ 2, III. and VI.), and as the sine of an angle is the same as the sine of its supplement, sin. A D C == sin A D E = cos. DA E = cos 4 /. Moreover, CD = b and A C = T. Substituting these values in the prectrding pro- b cos, -^ ^portion, we have sin. ^ I: cos. ^ I = b :… … Fig. 23. hxample. Given 7 = 30°, 6 = 130, to find Tan! R. Here h = 130^7=7° 30 7 = 987.4517= 15° 72 = 368.5.21 2.113943cot. 0.880571 2.994514col. 0.571948 3.566462 71. Problem. Given the angle of intersection KC B = 1 [Jig. 23). %nd the tangent A C = T, or the radius A 0 = R, to find C D -^ b.…
Railroad engineering · Ferrovias
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