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 265
OBSTACLES TO MEASUREMENT. A. When Both Ends of the Line aee accessible. 373. The methods given in the preceding articles for prolong-ing a line and for interpolating points in it will generally give thelength of the line by the same operation. The method of latitudesand departures is very generally… … 374. By Triangulation. Let AB be the inaccessible distance. Fromany point, 0, from which both Aand B are accessible, measure CA,C B, and the angle A C B. Then inthe triangle ABO two sides and theincluded angle are known to find theside A B. * 375. By Angles to Known Points. The length of a line,…
Surveying
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