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 223
ndex 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 the circle by 1, to which it… … If 15 spaces on the vernier are equal to 16 on the circle, each 15 1 fi v 3(Yspace on the vernier will be = —^— = 32, and the vernier will therefore read to 2. 313. Circle divided to 20. If 20 spaces of the vernier areequal to 19 on the circle, each space of the latter will be =19 X 20 20 19, and…
Surveying
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