otheoscope


From The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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