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 407
angles A and A. The angle Z A B is the observedzenith-distance (A) of /?, plus the re-fraction p—i. e., Z A B = A + p, andZBA = A + p\ Let 8 = A + p and 3 = A + //,Then 8 + 8 = A + A + p + p = ISO+ 0.The observations should be simul-taneous as well as reciprocal.When this is the case, we may take p… … BC sin. [180°-|(A;- A)]sin. [900 + JO +i (A-A)]s SIMPLE ANGULAR LEVELING. 393 COS. I (A — A + 0) When the angle 0 is very small compared with the other angles,this becomes : BC = L tan. £ (A — A). Or, using angles of elevation and depression (a and /?) we haye : bo=*. si°-*(:tgm [io.] COS. -J (a +…
Surveying
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