Letter | Published:

Flow of Smoke through a Hole in Resonant Cavity

Naturevolume 160page93 (1947) | Download Citation



Prof. G. D. West1 has used a smoke-filled cavity as a resonator and noted the stream of smoke issuing from a hole near the base; radiation pressure was suggested as a possible cause. In an alternative explanation2, Prof. E. N. da C. Andrade suggests that air is simply expelled during one half-cycle in a definite smoke-laden stream, and is drawn in during the next half-cycle, air being sucked in from all sides.

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  1. Nature, 158, 755 (1946).

  2. Nature, 159, 132 (1947).

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  1. National Research Council, Ottawa

    • F. W. SIMPSON


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