Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 473
bra-tions in the ordinary ray will everywhere be at right angles bothto the optic axis and to the direction of propagation. In the ex-traordinary wave the vibrations are in general oblique both to theoptic axis and to the direction of propagation of the disturbance.In this case we have an exception… … Fig. 326. DOUBLE REFRACTION. 455
Physics
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