Six lectures on light [electronic resource] : delivered in the United States in 1872-1873 (1882)
Tyndall, John, 1820-1893, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services, University College, London. Library Services · London : Longmans, Green, and Co. · leaf 205
183 DOUBLE EEFRACTION OF HEAT. Y. of light, our sifted beam of invisible heat. To deter- mine the positions of the two images, let us first operate upon the luminous beam. Marking the places of the light-images, we introduce between N and L our ray-filter (not in the figure) and quench the light.… … Pushing the pile across the interval separating the two marks, the needle first falls to 0°, and then rises again to 90° in the second position. This proves the double refraction of the heat. I now turn the Iceland spar: the needle remains fixed : there is no alteration of the deflection. Pass- ing…
Boyle, Robert, 1627-1691 · Young, Thomas, 1773-1829 · Arago, F. (François), 1786-1853 · Light · Wave theory of light · Optical illusions · Gravitation · Vision
Internet Archive · UCL Library Services, University College London (UCL) · Public domain (published before 1931). Free to use for anything.
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