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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 293

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 293
g case, by findingin a Traverse Table, the final Latitude and Departure of the desiredline (or a Latitude and Departure having the same ratio) and theBearing and Distance corresponding to these will be the angleand distance desued. (419) By similar triangles. Through A measure any line CD.Take a… … :^ EG, will give the distance EG, fromSo for other points. Fi-. 2£ (420) By triangnlation. Whenobstacles prevent the preceding me-thods being used, if a point, C, can befound, from which A and B are accessi-ble, measure the distances CA, CB,and the angle ACB, and thence calculate the angle CAB.…

Surveying

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