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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 138

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 138
* This is another example of the fruitful priuci jle of Reversion, first noticed laArt. (105;. CHAP II.] The Compass. 131 … its present and in its former positionThis makes it certain that the needle isstraight, or that its two ends and its cen-tie lie in the same straight line. Secondly, to put the pivot in the cen-tre. ]\Iove it till the straightened needlecuts opposite di^dsions. It is then certainthat the direction…

Surveying

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