Ka-leï'do-phōne, n.

n. [Gr. καλός, beautiful, εἶδος, appearance, and φωνή, sound.] A contrivance 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.