Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 180
as elsewhere, the different lengths of the light-wavesgive rise to iris-colom-s when white light is employed.Besides the regular crystals which produce double Fia. 49. … refraction in no direction, and tlie uniaxal crystalswhich produce it in all directions but one, Brewsterdiscovered that in a large class of crystals there arehuo directions in which double refraction does not takeplace. These are called hiaxal crystals. When platesof these crystals, suitably cut,…
Light
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