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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
er the 0 points on the circle. The surveyor can also examine for himself, by the principle ofKeversion, whether the hne of the sights passes through the centreor not. Sight to any very near object. Read oflf the number ofdegrees mdicated by one end of the needle. Then turn the com-pass half around,…

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