Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 335
cribed thus far for locating railwaycurves, apply to points 100 feet apart. This is sufficiently 328 ELEMENTS OF SURTETIXG. [BOOK IX. accurate for the earthwork. In laying the track, however, stakesevery ten or twelve feet are necessary. These are set by drawingthe chain or tape in a straight line… … 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, FX2 = EL X LK. (Legendre, Bk. IV., Prop. 23, cor. 2). Since EL = r — 50, and LE = r + 50, the value of VL is readily calculated for known yalues of…
Surveying
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