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 374
red qualities. Stephensons tri-pod has a ball-and-socket joint belowthe parallel plates, so as to admit of being at once set nearly levelon very steep slopes. Quick-leveling tripod-heads, for quickly setting the leveling-plates nearly level, are made of various patterns. Extension tripods are… … 360 LEVELING. vertically. To detect whether the rod leans to or from the instru-ment, its front may be angular or curved. If angular, when heldleaning toward the instrument, the lines of di-vision will appear as in Fig. 375. When lean-ing from the instrument, they will appear as inFig. 376. They…
Surveying
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