Kaleidophone : 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.

Example:


Taxonomy
Kaleidophone, rod, Koenig, bead, Charles Wheatstone, Lissajous figures, apparatus, Max Kohl, inventor, Philosophical, Toy, own right, optical device, Scottish physicist, physicist David, David Brewster, transverse vibrations, light source.

Defination from the web:
Kaleidophone, but in all cases a slender rod, fixed at one end, is set into transverse vibrations. ... The Kaleidophone at the left is essentially identical to the Koenig model above but it is clearly marked with the name of Max Kohl of Chemnitz, Germany. ...