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 364
adeparallel to the level—i. e., this line is so adjusted as to be horizon-tal when the bubble of its level is in the center. There are many different forms of the telescope-level, of whichthe most important ones will now be given. 511. The Y-Level. This is so named from the shape of thesupports of… … wyes by tapering pins, so that the telescope can be clamped in anyposition. The milled-headed screws at M and M are used to move 350 LEYELIXG. Fig. 365. the object-glass and eye-piece in and out, so as to adjust them forlong and short sights, and for short-sighted and long-sighted per-sons. L is a…
Surveying
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