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 227
nier from 10 toward the right, where the lines coin-cide, is 3 20 (or it is 10 — 6 40 = 3 20), and the entire readingis therefore 4° 23 20. 318. Double Verniers. To avoid the inconveniences of read-ing backward, double verniers are sometimes used. Fig. 228 212 LANDSUR VETING. shows one applied to a… … the left-hand vernier is to be read, as in Art. 312; but when thedegrees are counted to the right, from the 360° line, the right-hand vernier is to be used. 319. Oompass-Vernier. Another form of double vernier, oftenapplied to the compass, is shown in Fig. 229. The limb is Fig. 229. — ^ 2|0 25 30…
Surveying
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