A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 366
vision by linesstarting from two given■points, P and Q. Reducethe quadrilateral to an equi-valent triangle CBE, as inArt. (87). Divide EB intothree equal parts at F and /sl Z G. Join CQ, and, from G,draw GK parallel to it. Jom CP, and from F draw FL parallelto it.- Join PL and QK, and they will be… … FiR. 392.
Surveying
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