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 215
d from the divided edge of the lower halfof the cylinder, by means of a vernier on the upper half.* * The proper care of instruments must not be overlooked. If varnished, theyshould be wiped gently with fine and clean linen. If polished with oil, they shouldbe rubbed more strongly. The parts… … VERNIERS. 201 VERNIERS. S05. Definition. A vernier is a contrivance for measuringsmaller portions of space than those into which a line is actuallydivided. It consists of a second line or scale, movable by the sideof the first, and divided into equal parts, which are a very littleshorter or longer…
Surveying
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