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 74
205.1 X cot. 100° =-212.49. This value is positive, because it is the product of two nega-tive factors, cot. 100° being the same as —cot. 80°, a negative quanti-ty. Then AC= AG + GC= 1620.23 + 212.49 = 1832.72, and BC = -.—^bn = 1223 69. Having thus found the distances of Asin. 1UU- ° and B from… … ^ig. 27 Solution. First Method. Suppose the instrument to be placed atA (fig. 27), and that a house, for instance, covers the station at B, andalso obstructs the view from A to the stations at D and E. Lay offfrom A C, the tangent at yl, such a multiple of the deflection angle Z),iis will be…
Railroad engineering · Ferrovias
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