The kaleidophone devised by Charles Wheatstone in 1827 gives these figures in a simple way.
Various modifications of the kaleidophone have been made (Rayleigh, Sound, § 38).
The kaleidophone, intended to present visibly the movements of a sonorous body, consisted of a vibrating wire or rod carrying a silvered bead reflecting a point of light, the motions of which, by persistence of the successive images on the retina, were thus represented in curves of light.
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