Crookes radiometer
noun Optics.
Origin of Crookes radiometer
First recorded in 1880–85; after Sir W.
Crookes
British Dictionary definitions for crookes radiometer
Crookes radiometer
noun
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