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 122
lysupported on a tripod, consisting ofthree legs, shod with iron, and so con-nected at top as to be movable in anydirection. There are many forms ofthese. Lightness and stiffness are thequalities desired. The most usual formis shown in the figures of the transitand the level. Of the two… … 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…
Surveying
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