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
Fig. 145. Fig. 146. … it, which is screwed on the lower half. Fig. 145 is called theshell-joint. In it the two shell-shaped pieces inclosing the ballare tightened by a thumb-screw. Fig. 146 is Cugnots joint.It consists of two cylinders placed at right angles to each other,and through the axes of which pass bolts, which…
Surveying
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