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 143
ject and that ofthe former, will be the angular distance of the objects in question.Thus, suppose the former bearing to be 40^ 30, and the latter10^ 15, both east, or both west,from the noHh or south, the anglewiU be 30^ 16. The divisions aregenerally numbered 5°, 10°, 15°,&c. around the circle… … CHAP II.] The Compass. 137 (233) The prismatic compass is generally held in the hand, thebearing being caught, as it were, in passing; but more accuratereadings would of course be obtained if it rested on a support, suchas a stake cut flat on its top. In the former mode, the needle never comes…
Surveying
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