A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 246
sure a base from the ends of which allthe corners of the tract can be seen, and take their anglesof position. There will thus be a system of trianglesformed, giving data for calcu-lating the content of the tract.Thus, if ABODE (Fig. 165) re-present a field, measure a baseFG, and from F and G take… … Example. To determine the area of a field ABODE, I mea-sured a base line FG of 12.25 chains, and at F and GItook the angles of position, as follow:—GFA = 63° 15,27° 33, GFC = 35° 35, GFD = 58° 25, GFE =FGB = 58° 30, FGC = 97° 12,FGD = 72° 28, and FGE = 37° 32. Fig. 165 is a platof this tract, on a…
Surveying
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