Abstract
The formation of dust striations by electric spark has been investigated by many observers. The Paper attempts to explain their formation as being due to hydrodynamic forces existing between the dust particles while the wave motion is passing over them. The application of this theory to the striations in a Kundts tube has been made by Koenig and Robinson. The wave motion is assumed to be of the spherical progressive type and expressions are obtained for the intervals between consecutive striae and the distances of the striae from origin. Measurements were made of striae formed on a glass plate with vertical central spark. The agreement between theory and experiment is within the experimental error. Experiments with channels of various shapes were made. Illustrations of the various striae patterns obtained with small obstacles and reflecting surfaces are given, and the use of these as a convenient means of indicating reflection interference and diffraction of sound waves is pointed out.
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