A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 409
2 . 82589. The quantity * ~2m K2 has been tabulatedZ r 2 r for values of K up to 18,000 metres for office use. Fig. 427. 587. Reduction to the Summits of the Signals. Stations aand b can not be seen from each other.Signals are erected at each point, andfrom a the angle B a C = A is observed ;and… … a= A P=B + h . sin. 1h. cos. B [12.] k . sin. 1The difference is in seconds. Usually, in such cases, zenith-distances are taken, and the ob-served angles are called A and A. The reduced angles are 8and 8. Draw a line in the figure from A to B.A B a we have : sin. A B a : sin. A : : li :li sin. A…
Surveying
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