International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 68
from which it takes its name. SURVEYING. 657 The line of sight, or coUimation, is identical to that in thetransit explained in Art. 1225, and is parallel to the levelE F. The tube containing the eyepiece G has an exteriorring //, which is milled to assist the hand in turning thetube. This movement… … Fig. 887 clamped by the screw X. By means of the tangent screw X,the telescope can be slowly turned horizontally. The tele-scope is leveled by means of the leveling screws [ ^ Q, R, and 5.The level is supported by the tripod T. The cross-hairs areof either platinum wire or spider threads, and are…
Railroad engineering
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