A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 76
al circle, A, by which vertical angles aremeasured, is attached to the telescope axis, and is read with avernier on the lower side. A level, L, is attached to the tele-scope, in the same manner as that of the Y level. The ver- METHODS AND INSTRUMENTS. 57 nier-plate, which carries the telescope, is… … motion screw. Attached to the upper parallel plate is anotherclamp, C, and a pair of slow-motion screws, T T, by whichall of the instrument above the clamp may be given a slowmotion, horizontally. The vernier-plate is furnished with twolevels, at right angles to each other. One of them, D, is 58…
Surveying
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