Preston, Thomas, Joly, Charles Jasper, 1864-1906, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Macmillan and Co. · leaf 422
COLOURS OF THIN CRYSTALLINE PLATES 398 CHAP. XY making y zero in the above equation. It consists of two branches, one having asymptotes parallel to the optic axes, the other interior to it is … degree. (1) Section Parallel to the Plane of the Axes. — The sections of the isochromatic surface by a plane parallel to that containing the optic axes difi'er little near the centre from hyperbolas. [The equation of these hyperbolas is found by replacing y by e and neglecting powers and products…