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 130
nd Cil/the extremeside lines, and 0 the centre of the curve. Then the calculation of tlieQrst section would include all between the lines .41 Ci and B^Di\^-hile the true section lies between A C and B D. In like manner, thecalculation of the second section would include all between HK andNP, while… … ^n ■mull by the mass represented by BiFB These masses balance 112 EARTH-WORK. each other, when the distances out on each side of the centre line areequal, that is. when the cross-section may be represented hy ADFRE(fig. 56). But if the excavation is on the side of a hill, so that thedistances out…
Railroad engineering · Ferrovias
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