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 222
7 Suppose 30 spaces on the vernier to be equal to 29 on the cir- 29 X 30cle. Each space on the vernier will be = —^— = 29, and will therefore be less than a space of the circle by 1, to which the ver-nier will then read. Fig. 220 shows this arrangement. The reading is 0°, or 360°. In Fig. 221 the… … In Fig. 222, the reading is 20° 40, the index being at apoint beyond 20° 3, and the additional space being shown bythe vernier to be 10. Sometimes 30 spaces on the vernier are equal to 31 on the circle. 31 X 30 Each space on the vernier will therefore be 30 = 31, and will be longer than a space on…
Surveying
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