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 108
e, till C E isequal to OB. Measure E D, andit will be equal to A B, the distance required. If more convenient, make CD and CE equal, respec-tively, to half of A 0 and C B; then will A B be equal to twiceDE. Let A B be the required distance. Seta stake, C, in the line prolonged ;set another stake,… … Measure AC, A F, and FE. Then is AB = ^(FE-AF). B. When One End of the Line is inaccessible.149. By Perpendiculars. This principle may be applied in avariety of ways. In Fig. 118 let AB be therequired distance. At the point A set off ACperpendicular to AB, and of any convenientlength. At C set off…
Surveying
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