Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 1082
on, arid specially investigated by Sir D.Brewster. This property consists in the exhibition of differentcolours by these crystals, according to the direction in which thelight is transmitted through them, a crystal of chloride of plati-num, for example, appearing of a deep red when the light… … Fig. 755.—Spiral crystallisation of sulphate of copper. absorption of some of the coloured rays of the light which is polar-ised during its passage through the crystal, so that the two pencilsformed by double refraction become differently coloured, the degreeof difference being regulated by the…
Microscopy
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