Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 157
the former reading. 150 ELEMENTS OF SUKVEYING. [book III. 170. In order to read a vernier correctly, especially if it beone with which we are not familiar, it is necessary to estimate,hy the eye alone, the fractional part of one unit to be added ;then if the vernier reading is nearly the same as… … -6,5^; a^^^^ ^s. FiQ. 84. 171. In a vernier compass, the vernier is attached, asshown in the figure. A small arc HI is described on the barAB, having its centre at the centre of the compass-box. Thisarc is divided to degrees, and sometimes to the parts of a degree.The vernier is permanently…
Surveying
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