Powder Ridges in a Sound Field


I HAVE found that the distance between powder ridges, formed on a flat surface in a sound field1, increases rapidly with the size of the particle. Those who describe Kundt powder ridges make no mention of this fact. My results, however, appear to be a ‘rediscovery’ of some of Kundt's2 original observations which, in view of their importance, are reproduced in the accompanying illustration. Whereas his fine striæ were formed with lycopodium spores of diameter 20 µ, the wider Rippen shown on their right consisted of fine sand grains of peak diameter c. 200 µ.

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  1. 1

    Waller, Nature, 166, 961 (1950).

  2. 2

    Kundt, Ann. Physik, 127, 497 (1866).

  3. 3

    Andrade, Proc. Roy. Soc., A, 134, 445 (1931); Phil. Trans., A, 230, 417 (1932).

  4. 4

    Bagnold, Proc. Roy. Soc., A, 187, 1 (1946).

  5. 5

    Soellner and Bondy, Trans. Farad. Soc., 32, 616 (1936).

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WALLER, M. Powder Ridges in a Sound Field. Nature 174, 368–369 (1954) doi:10.1038/174368a0

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