The Collaborative International Dictionary
Kaleidophone
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.
Wiktionary
kaleidophone
n. (context obsolete physics English) A device, consisting of a reflective ball attached to a vibrating rod or plate, that produces optical figures that correspond to the mode of vibration of the rod or plate