International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 32
isattached to the telescopeaxis and adjusted by thetangent screw E. Thestandards G and G, whichsupport the telescope, arefastened to the upper orvernier plate, as is one ofthe levels H, the otherbeing carried by one of thestandards at H. The com-pass circle A, which isdivided like that of… … 023 SURVEYING. screw which clamps the vernier plate to the divided limb isshown at /•. Slow motion is given to the upper plate byt;) the tangent screw J/, and to the divided limb by the screw L. The transit is fastened to the plateN by a ball and socket joint, and is leveled bymeans of the screws…
Railroad engineering
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