Elements of natural philosophy (Volume 2-3) . Illustrations ; § 169. We will now consider briefly the case of biaxalcrystals. Let a plate of such a crystal be cut perpen- 360 NATURAL PHILOSOPHY. their fundamentalproperty; Effects of biaxai dicularly to the line bisecting the optic axes, and let itcrystals. ^q interposed, as before, between the polarizer and ana- lyzer. In this case, the bright and dark bands will nolonger be disposed in circles, as in the former, but willform curves which are symmetrical with respect to thelines drawn from the eye in the direction of the twoaxes. The points of
Elements of natural philosophy (Volume 2-3) . Illustrations ; § 169. We will now consider briefly the case of biaxalcrystals. Let a plate of such a crystal be cut perpen- 360 NATURAL PHILOSOPHY. their fundamentalproperty; Effects of biaxai dicularly to the line bisecting the optic axes, and let itcrystals. ^q interposed, as before, between the polarizer and ana- lyzer. In this case, the bright and dark bands will nolonger be disposed in circles, as in the former, but willform curves which are symmetrical with respect to thelines drawn from the eye in the direction of the twoaxes. The points of the same band are those for whichthe interval of retardation of the two waves, is and The curve formed by each band is the Lemniscata ofJames Bernouilli,—the fundamental property of whichis, that the product of the radii vectores, drawn fromany point to two fixed poles, is a constant quantity. Theexactness of this law has been verified, in the most com-plete manner, by the measurements of Sir John Her-schel. The cons
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