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 172
d two squares were counted to theright, then 2 x 2.75 = 5| squares, should be counted upward, toE, and AE would be the required course. (272) With a paper protractori Engraved paper protractorsmay be obtained from the instrument-makers, and are very conve^ * This and all the following ratios may be… … nient. A circle of large size, divided into degrees and quartei-a,is engraved on copi^er, and impressions from it are taken on draw-ing paper. The divisions are not numbered. Draw a straight lineto represent a meridian, chrough the centre of the circle, in anyconvenient direction. Number the…
Surveying
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