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 493
ME OR HYDRO GRAPHICAL SURVEYING. distance measured will be, in the first case, twice, and in the sec-ond case three times the desired one. When the distance A D can not be measured, as in Fig. 523, fixD as before. Set the index at 26° 34, and go along the line to E,where the objects are seen to… … set to half that angle, looking at A directly, and B by reflection,till you come to some point, C, at which they coincide. Then isCA= AB. 710. To measure a Line when Both Ends are inaccessible. Let AB be the required line. At any point, C, measure the angleA C B. Set the sextant to half that angle,…
Surveying
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