kaleidophone


From The Collaborative International Dictionary of English v.0.48:

Kaleidophon \Ka*lei"do*phon\, Kaleidophone \Ka*lei"do*phone\,
   [Gr. ? beautiful + ? appearance, form + ? sound.] (Physics.)
   An instrument invented by Professor Wheatstone, consisting of
   a reflecting knob at the end of a vibrating rod or thin
   plate, for making visible, in the motion of a point of light
   reflected from the knob, the paths or curves corresponding
   with the musical notes produced by the vibrations.
   [1913 Webster]
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