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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 169

An illustration from 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, leaf 169
e bearing isto be laid off. It is then turned tiU one of its cross-lines coincideswith some one of the luies on the paper, which represent East andWest fines. The long side of the protractoi wiU then be on ameridian and the proper angle (40° in the figure) can be at oncemarked off. The length of… … CHAP. IV.] Platting the Survey. 163 (270) A common rectangular protractor without any cross-lines,or a semi-circular one, can alsobe used for the same purpose.The parallel lines on the paper(which, in this method, maybe equi-distant, as in commonruled writing paper) will nowrepresent meridians.…

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