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 127
n b^gins on each side of tlie road-bed, and the section may be calcu- I Ob EARTH-WORK. [ated as a pyramid, having its Aertex at the first of these points, andfor its base the cross-section at the second. The preceding methodgives the same result, since w and h in this case become 0, and reduce;he… … ^ution. Let A HE FE - Ar CD Bi F^ Ei (fig. 54) represent oneside of a section, the surface of -which is too irregular to be dividedinto two planes. Suppose, for instance, that the ground changes atH^ C, and Z), making it necessary to divide the surface into five trian-gles running from station to…
Railroad engineering · Ferrovias
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