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 517
Z- SURVEYING AND LEVELING OLD LINES. 503 transit an extra telescope is attached on one side, as shown in Fig.561, and is balanced by a weight on the opposite side. The ad-vantage of this form is, that sights may be taken vertically up ordown, as is sometimes necessary in connecting the…
Surveying
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