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 107
ound the end which was atP, or at A, till it meets the given line in apoint C, which will be the foot of the re-quired perpendicular. (154) Second Method. Take any point,as A, on the given line. Measure a dis-tance AB. Let the end of this distanceon the chain be held at B, and swing aroundthe end… … CH4>P. v.] Obstacles to Mcasnrement. 101 (155) Third Method. At any convenientpoint, as A, of the given line, erect a perpen-dicular, of any convenient length, as AB, andmark a point C on the given line, in the lineof P and B. Measure CA, CB and CP.Then the distance from C to the foot of the…
Surveying
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