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 132
Fig. 153. … tion must be at C, and the forwardbearing must be corrected by the dif-ference just found between the fore-and back-sights, adding or subtractingit, according to circumstances. Aneasy method is to draw a figure for thecase, as in Fig. 153. In it, supposethe true bearing of B C, as given bya…
Surveying
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