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 368
ne of ° a each pair of opposite c piscrews is replaced by a strong spring, and insome instruments onlythree screws are used. The lower plate isscrewed on to the tripod-head. 517. Fig. 367 is atwenty - inch Y - level,and Fig. 368 is a longi-tudinal section of it,showing its construc-tion. In Fig.… … 354 LEVELING. end of the object-glass slide passes. The use of these sets of screwswill be explained under Adjustments. The interior spindle, D, which supports the instrument, and onwhich it turns, is made of steel, and is carefully fitted to the in-terior of a hollow socket of bell-metal, which…
Surveying
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