Abstract
IN 1870 Dr. Tyndall described the dark or dust-free plane which rises from a hot body in illuminated dusty air, and gave two explanations of the dust-freeness of this dark space. Another explanation was suggested by Dr. Frankland. In 1881 Lord Rayleigh re-examined the phenomenon, and discovered that a cold body gave a similar down-streaming plane. He also suggested a totally different explanation. The writers discuss all these suggested explanations, and see reasons for rejecting them all. They have, moreover, observed that the dark plane rising from a hot body is only a prolongation of a well-defined dust-free coat of nearly uniform thickness under ordinary circumstances surrounding the body, and they point out that this dark coat is the thing really requiring explanation, the dark plane being merely due to the up-carrying of portions of this coat by convection currents.
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On the Phenomena Exhibited by Dusty Air in the Neighbourhood of Strongly Illuminated Bodies 1 . Nature 29, 417–418 (1884). https://doi.org/10.1038/029417a0
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DOI: https://doi.org/10.1038/029417a0