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 251
ires are called Stadia Wires. The stadia wires may be eitherfixed or adjustable. In the former case they may be attacheddirectly to the cross-hair ring. When they are adjustable, eachmay be fastened to a separate slide, actuated by a capstan-screw onthe outside of the telescope-tube, as shown in… … It is evident that, in looking through the telescope at a gradu-ated rod, a certain portionof the rod will be inter-cepted between the stadiawires, and that the greaterthe distance at which therod is held, the longer willbe the space on the rod in-tercepted by the stadiawires. Referring to Art.…
Surveying
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