A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 87
h. sin. A - ., „. , ti. sin. A d= A + 7. „,_ -,,/, andd= a + &. sin. 1 ^.sin.r- [13.] The difference is in seconds. Instead of h and N some writers use dH. and dW; or dAand <£A/, meaning difference of height, and difference of alti-tude. For great exactness, instead of using the mean radius… … to find B B we measure two diameters, 2 E and 2 r, and thedistance apart, h. SIMPLE ANGULAR LEVELLING. Then, B B = 69 B-r &4-] If the oblique distance I be measured instead of A, then E B^ [* +(B-*■)] [J-(B-*•)]. [1.5.] BB = When the spire is very aeute, then this method is inac-curate. , Fig.…
Surveying
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