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Harmonograph

48 resonance PicTures and how to sing a daisy A more complete set of Chladni figures is shown opposite, all two or fourfold because they were produced on a square plate. Below, however, we see some circular pictures. They were photo graphed by Margaret Watts Hughes, a keen singer, in the 1880s on an ingenious device called an Eidophone, which consisted of a hollow funnel with a membrane stretched across it and a tube attached to its base with a mouthpiece at the other end. As Mrs. Hughes sang diatonic scales down the tube, fine lycopodium powder scattered on the taut membrane suddenly came to life, bouncing away from some places and staying still at others, producing shapes which she likened to various flowers. Yet again, we see recognisable forms and shapes appearing from simple resonance and harmony.
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