Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 289
g. 62 mP = Vr2 + t2 — r. 3. Place transits at B and E (Fig. 63). Direct the tele-scope of the former to E, and of the latter to A. Turneach toward the curve thesame number of degrees,and mark P, the point ofintersection of the lines ofsight. P is a point in thecircle to which AB and AEare tangents… … Fig. 63 RAILROAD SURVEYING 301 PBP, •••, each equal toiD, and take BP, PP, PP,■ • -, each 100 feet, the lengthof the tape. Then, P, P,P, • • • lie on the requiredcurve. If the angle A and thetangent distance BA = tare given, D can be foundfrom the formulas 50
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