Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 232
F THE OrDINATES. II. The methods described thus far for locating railwaycurves, applj^ to points 100 feet apart. This is sufficientlyaccurate for the earthwork. In laying the track, however,stakes every ten or twelve feet are necessary. These are set bydrawing the chain or tape in a straight line… … ZM Let VW represent a 100-ft. chord of a railway curve, of whichC is the centre. Draw the diameter HK parallel to VW, anddrop the perpendicular VL. Then, VD = HL X LK, (Legen-dre, Bk. IV., Prop. 23, cor. 2). Since IIL = r—50, andLK = r + 50, the value of VL is readily calculated for knownvalues of…
Surveying
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