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 367
m -\- nTaking it from the area BCDEH,the remainder will be the areaBPQH. The quadrilateralBCEH, CE being supposed to be drawn, can then be divided bythe method of Art. (548), into two parts, BPQH and PQEC,having to each other a known relation. If DK were the given direction, at right angles to the… … X A W B P of the given polygon, both ways, and reduce the polygon to a singleequivalent triangle, XYZ, by the method of Art. (82). Thendivide the base, XY, in the required ratio, as at W, and drawZW, which will be the division line desired. In this figure thepolygon is divided into two equivalent…
Surveying
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