Lines on the Surface of Moving Water

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SINCE reading the interesting accounts of this phenomenon by Prof. W. Schmidt1 and Prof. H. Stansfield2, I have noticed several striking instances which yield a clue to their cause. They occurred on the surfaces of clear country streams bridged by planks that touched the water, obstructions which, mechanically, resemble the mill-stream example described by Prof. Stansfield. Evidently the macroscopic agent causing the sudden change in velocity need penetrate only to a very small depth.

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  1. 1

    NATURE, 137, 777 (1936).

  2. 2

    NATURE, 137, 1073 (1936).

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