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From: Webster's Revised Unabridged Dictionary (1913)

 Ka·lei·do·phon Ka·lei·do·phone  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.
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