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 225
he vernier areequal to 59 on the circle, each space on the vernier will be =59 X 15 60 14 45, and the vernier will read to 15. In Fig. 225 the reading is 10° 20 45, the index pointing to 10° 15, andsomething more, which the vernier shows to be 5 45. 315. Circle divided to 10. If 60 spaces on the… … 10 987 6| 54321 316. Reading backward. When an index carrying a vernier ismoved backward, or in a contrary direction to that in which thenumbers on the circle run, if we wish to read the space which ithas passed over in this direction from the zero-point, the verniermust be read backward (i. e.,…
Surveying
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