Abstract
SIR WILLIAM GROVE described some experiments he had recently made with a modificition of Crookes's radiometer. After a few prefatory trials, such as coiling one-half of the bulb with tinfoil and electrising it, which gave no notable results, he devised a method, shown in the accompanying sketch, by which he could electrise the whole of the internal system. Four aluminium vanes, each blackened on one side, had metallic arms and 2 metal point at their crossing that rested in a metal cup. The latter was united to a platinum wire that passed through a glass tube and was fused into it, the platinum wire protruding. Lastly, the glass tube was fused inside the apparatus and hermetically sealed, the end of the platinum wire being exposed. The vacuum in this apparatus was considered by Mr. Crookes2 to be as perfect as in his radiometers generally, but Sir Willana Grove doubted that it was so The following were the results:—
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G., W. Sir William Grove on the Radiometer 1 . Nature 15, 435 (1877). https://doi.org/10.1038/015435a0
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DOI: https://doi.org/10.1038/015435a0