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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 223

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 223
ite, the large level b, and the semi*circle NN are for the purposes of Levelhng, and of measurinoVertical angles. Thej will therefore not be described in this place. (328) As the value of either of these instruments dependagieatlj on the accurate fitting and bearings of the two concentricvertical… … mverted frustum of a cone, marked AA, supports the upper plateBB, which carries the index, or Verniers, V, V, and the Telescope.The whole bearing of this plate is at C, C, on the top of the hollowinverted cone EE, in which the spindle turns freely, but steadily.This interior position of the…

Surveying

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