Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 469
f the second crystal be turned round the line s s as anaxis, the plane of vibration of the ray falling on itssurface will no longer coincide with the plane in whichan ordinary ray vibrates in the crystal, and it thereforebecomes split up into two, one vibrating in the plane asan ordinary ray, and… … Fig. 205.—Appearance of the Spots of Light ou the Screen shown in the precedingFigure, allowing the ordinar}^ ray to pass and rotating the second Crystal. refraction becomes more and more coincident with theplane of vibration of the incident ray, until, when ithas revolved through 90°, it coincides…
Astronomy · Telescopes
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