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Crookes radiometer

noun, Optics.
radiometer (def 1).
1880-85; after Sir W. Crookes
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for crookes-radiometer

Crookes radiometer

(physics) a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side. The vanes are mounted on a vertical axis and revolve when light, or other radiant energy, falls on them
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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