Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 162
Fig. 85. called the limb of the instniment. Fitted to the upperconical surface of the main socket is a second socket to whichis united a thin circular plate, A A, called the Vernier Plate, SEC. I.J surveyors transit. 155 which rests on the limb of the instrument and carries a compass-circle,… … Fig. 86. 178. The sectional view, Fig. 86, shows the interior construc-tion of the sockets of the transit, the manner in which it isdetached from the spindle, and the means by which it can betaken apart if desired. In the figure, the limb BB is attached to the main socket ofLL, which is itself…
Surveying
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