A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 123
108 LAND-SUR YEYING. The joints by which the instrument is connected with thetripod are also various. Fig. 144 is the ball-and-socket joint,most usual in this country. It takes its name from the ball inwhich terminates the covered spindle which enters a correspondingcavity under the compass-plate… … Fig. 145. Fig. 146.
Surveying
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