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
e 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 triangles andtrapezoids which fall outsideof these, may then be calcu-lated and added to the entire square chains which have… … OHAP. IV.] Calculating the Content. 49 same paper will ianswer for any number of plats drawn to the samescale. This method is a valuable and easy check on the results ofother calculations. To calculate the fractional parts, prepare a piece. of tracingpaper, or horn, by drawing on it one square of…
Surveying
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