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 410
: sin. A B a : sin. A : : li :li sin. A Then in the triangle Jc. or, sin. A B a =and a B A = ksm.r>h sin. Ak sin. V = A-f h . sin. A and 8 = A -f li. sin. Ak . sin. 1 [13.] k. sin. 1 The difference is seconds. Instead of li and h, some writers use d H and d H; or d A andd A, meaning difference… … 588. When the height of the signal above the instrument cannot be measured, if the sig-nal be conical, like a spire,etc., to find B B we meas-ure two diameters, 2 Eand 2 r, and the distanceapart, h. Then,BB=i^. [14] If the oblique distanceI be measured instead of h, then BB=E37^[H(E-r)] [i-(B-r)].…
Surveying
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