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 101
86 LAND-SUR VEYING. point, as D. Make another equilateral triangle, DEF, as be-fore, and thus fix the point F. Prolong DP to a length equalto that of AD, and thus fix a point, G. At G form a thirdequilateral triangle, GHK, and thus fix a point, K. Then willK G give the direction of A B prolonged.… … Let A B be the line to be pro-longed. Take any convenientpoint, as C. Kange out theline, AC, to a point A, suchthatCA = CA. Eange outC B, so that C B = C B.Eange backward A B to somepoint D, such that D 0 pro-longed will pass the obstacle.Find, by ranging, the inter-section at E of D B and A C.…
Surveying
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