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The Collaborative International Dictionary
Otheoscope

Otheoscope \O"the*o*scope\, n. [Gr. ? to push + -scope.] (Physics) An instrument for exhibiting the repulsive action produced by light or heat in an exhausted vessel; a modification of the radiometer.
--W. Crookes.

Wiktionary
otheoscope

n. An instrument for exhibiting the repulsive action produced by light or heat in a vacuum; a modification of the radiometer.