Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 290
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 … Fig. 64 sin £ D = — > and r = t tan \A.50 Whence, sin \ D = — cot £ A. EXERCISE X 1. The cross-section areas at five stations, 100 feet apart,of a railroad cut are, respectively, 576.8 square feet, 695.1square feet, 809.5 square feet, 652.0 square feet, and 511.7square feet. Compute the volume…
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