A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 245
zero of the Vernier is 4° 20, and something more, and the readingof the Vernier from 10 towards to the right, where the lines coin-cide, is 3 20, (or it is 10 — 6 40 = 3 20), and the entirereading is therefore 4° 23 20. (356) Double Verniers. To avoid the inconveniences of read-ing backwards,…
Surveying
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