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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 219

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 219
index for the divided circle, like the hand ofa clock. When the Telescope is directed to one object, and thenturned to the right or to the left, to some other object, this index,which moves with it and passes around the divided edge of theother plate, pouits out the arc passed over by this change… … CHAP. I.J The Instruments. THE THEODOLITE. FiR. 213 213

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