Crookes radiometer(redirected from Light-mill)
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Crookes radiometer[′kru̇ks ‚rād·ē′äm·əd·ər]
A radiometer used to demonstrate that radiant energy from the sun can produce motion; a miniature four-vane windmill is mounted in a glass-envelope vacuum tube, with each vane polished on one side and black on the other.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.