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
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… … VERNIERS. 209 41 X 20space on the vernier will be = —^— = 20£, and the vernier will therefore read to 20J- — 20 = 30. It will be retrograde. InFig. 223 the reading is 360°, or 0°; and it will be seen that the Fig. 224. 50 € 40 10 9 8 SM6 5 4 3 2 * <f 40 spaces on the vernier (numbered to whole…
Surveying
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