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
s larger vertical angles to bemeasured than would be possible without it. The Transit. 301. The Engineers Transit (Fig. 213). This instrument issimilar in general construction to that shown in Fig. 199, butdiffers from it in several important particulars. The sockets forthe axes of the plates are… … as is usual, are placed near the north and south points of thecompass-circle, so that the observer can read the vernier withoutstepping to the side of the instrument. The slow motion, both ofthe upper and lower plate, is given by one tangent-screw. In each THE INSTRUMENTS. 199 case an opposing…
Surveying
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