Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 187
havethirty spaces on each side of the zero line, it is always readdirectly. The usual form of the double vernier, shown in 14 SURVEYING. Fig. 12, has only fifteen spaces on each side of the zero line.When the vernier is turned to the right less than 15 past adivision line of the limb, read the… … Uses of the Compass Vernier. The most important use of thevernier of the vernier compass is in setting off the variationof the needle (§ 23). If 4he variation of the needle at anyplace is known, by means of the vernier screw the compasscircle may be turned through an arc equal to the variation.If…
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