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 53
nically the proper position of a givenfrog. Solution. Denote the length of the switch rail by /, the length of thefrog by/, and its width by w. From B as a centre with a radiusBH= 2/, describe on the ground an arc G H K {fig. 15), and fromthe inside of the rail at G measure G H = 2 d, and from H… … tTOg. For the angle HB K has been made equal to h ^ and if B Mbe drawn parallel to the main track, the angle MBH is seen to beequal to h S. Therefore, MBK = BFC = ^ (F-[• S), and thiswas shown (§ 50) to be the true value of B F C. 53. If the turnout is to reverse, and become parallel to the…
Railroad engineering · Ferrovias
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