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 405
s approximately formoderately great distances), formula [1] givesB C as the height of B above A. But B 0is the true difference of heights of A and B.A correction for the curvature of theearth must therefore be made. It may bedone in two ways: either by calculatingCC, and adding it to B C, obtained… … In feet 0 0 = ^ = = 0-0000000239097c;2. 2 R 2 x 20912405Then, calling A C B a right angle, we have :BC = ^X tang. B A C + 0-000000023909^ in feet. . . [2.]The arc A C and the straight lines A C and A C are all threeapproximately equal. 582. Correcting the Angle. The angle CAO = }AOC, thecentral…
Surveying
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