Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 331
thoutusing the transit. In such case, the following method is gen-erally employed. Let A represent the point of tangency, G the centre, andV, 10, X, located points of the curve, one chain apart. From V, draw vu perpendicular to the tangent, and it willbe the first offset, which denote by o. Denote… … jomecr with v, and vn then drawn parallel to the tangent, weshall have (Leg., Bk. IV, P. 23), 1%Av^ = 2r • An ; hence, o = ^ (4) If, DOW, we prolong Av till vt := Av, and join t and w, rv BOOK IX.] RAILWAY CURVES. 325 tw will be the second offset, and will be double vu. For, thetriangles in the…
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