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 55
willthus be divided iato trapezoids, (ex-ceptuig a triangle at each end),and their content can be calculatedby Art. (67). Otherwise ; a line may be drawnoutside of the figure, and per-pendiculars to it be drawn fromeach angle. In that case thedifierence between the trapezoidsformed by lines drawn… … (74) Division into Squares. Two sets of parallel lines, atright angles to each other, y- gg one chain apart (to the scaleof the plat) may be drawnover the plat, so as to divideit into squares, as in thefigure. The number ofsquares which fall within theplat represent so many squarechains; and the…
Surveying
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