Abstract
THE polarization of the light reflected from coal surfaces has been examined by use of the same apparatus which served for an examination of the intensity of the light reflected at different angles of incidence1. As the photocell used had a response spreading from 4500 A. to 10000 A. with a maximum at 7500 A., a water cell was used to absorb the unwanted infra-red radiation. A No. 70 Wratten Monochromat filter was placed in front of the source, and an analysing Nicol prism before the photocell unit.
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References
Cannon and George, NATURE, 150, 690 (1942).
Fisher, Amer. Min., 19, 133 (1934).
McCabe, Fuel, 16, 309 (1937).
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CANNON, C., GEORGE, W. Refractive Index of Coals. Nature 151, 53–54 (1943). https://doi.org/10.1038/151053a0
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DOI: https://doi.org/10.1038/151053a0
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