Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 204
tal to the second position, it is obviously necessary to revolvethe face a c through the arc mnp, which is the supplement ofthe required angle. If, then, we can measure the angle throughwhich the crystal must be turned in order to reproduce the coin-cidence, we can easily calculate the angle of the… … Fig. 195. on a firm support, p g r. The circle is graduated on its rim tohalf-degrees, and may be revolved by means of the milled headV, which is fastened to one end of the axis. A vernier,* u, per-manently attached to the support at lo, indicates the angle throughwhich the circle is revolved, and…
Matter · Heat
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