A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 240
are some-times thus arranged. If 60 spaces on the Vernier are equal to 59 on the circle, theVernier can read to one-sixtieth of a division on the circle, i. e. to 1. (350) Circle divided to 3j. Such a graduation is a verycommon one. The Vernier may be variously constructed. Suppose 30 spaces on the… … The above figure shows tliis arrangement. The reading is 0°,or 360°. In the followino; fiorure, the dotted and crossed line shows whatdivisions coincide, and the reading is 20° 10; the Vernier beingthe same as in the preceding figure, and its zero being at a pointof the circle 10 beyond 20\ 234…
Surveying
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