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 214
o 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 spiral spring prevents any shake in the tangent-screw. The vertical arc is attached… … 200 LAND-SUB VEYING. Attached to the right-hand standard is the Gradienter(shown in detail in Fig. 245). 302. A vertical section through the body of the engineerstransit is given in Fig. 212. The lower plate, or divided limb/B, is supported by the hollow socket C. Through this hollowsocket passes…
Surveying
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