Preston, Thomas, Joly, Charles Jasper, 1864-1906, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Macmillan and Co. · leaf 365
of the wave theory, based on very different assumptions, lead to Fresnel's wave surface exactly. The existence of conical refraction cannot therefore be regarded as deciding in favour of Fresnel's particular doctrine. Direction of Vibration. — It is easy to determine the direction of the vibrations… … circle of contact drawn from M to the points where the rays meet this circle. It follows therefore that two rays meeting this circle at diametrically opposite points are such that their 1 Stokes, Brit. Assoc. Report, 1862.
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