Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 165
rew Q, Fig. 85, after which the smaller motions are made bythe tangent-screw R. There is a compass on the vernier plate that is concentricwith it, the uses of which have been explained under the headCompass. It also may be made to serve as a check upon themeasurement of angles with the transit, as… … ^^|^~W^ = telescope with its attached level, rest on and are made fast to theTernier plate. The vertical circle MM, Fig. 85, called theVertical Limb, is securely fastened tothe axis of the telescope; it is platedwith silver, graduated to half degrees,and with its vernier enables the sur-veyor to…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
