Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 228
Fig. 181. SEC. I.] MAKING THE SURVEY. 221 … Fig. 122. 254. To illustrate the principle of repetition in ttie measure-ment of angles, suppose the 0 of the vernier to coincide with the0 of the limb, and the telescope to be directed, from the stationA, Fig. 122, upon one of the objects, as the signal at B.Clamp the limb and, unclamping the…
Surveying
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