Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 102
Fig. 63 RAILROAD SURVEYING 93 PBP, • • -, each equal to\D, 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. 50Whence, 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…
Surveying
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-168-96.webp)
