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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 137

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 137
to examine if the needle bestraight. Fix the pivot temporarily, sothat the ends of the needle may cut oppo-site degrees, i. e. degrees differing by180^. The condition of things at thisstage of progress, will be represented byFig. 151. Then turn the compass-boxhalf way around. The error will now… … * This is another example of the fruitful priuci jle of Reversion, first noticed laArt. (105;. CHAP II.] The Compass. 131

Surveying

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