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 403
Fig. 421. … SIMPLE ANGULAR LEVELING. 389 The sights are on the top or sides, according as it is used as acompass or slope-measurer. It is used by sighting to the object,and at the same time reading off the angle, the hair covering thezero-mark when the instrument is level. Fig. 422. <rn> 577. German…
Surveying
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