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 213
198 LAND-SUR VEYING. Fig. 211. … 300. The Diagonal Prism (Fig. 211). This is a prism attachedto the eye-piece of the telescope, so that therays of light, coming from the object sightedto, and passing through the telescope, are re-flected to the eye at an angle of 90° to theline of sight of the telescope. The prism isattached to a…
Surveying
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