Observations have been made on the sound radiated by a self‐excited underwater jet‐edge system, in which a flat jet of water impinges on the sharp edge of a wedge or blade. Comparison made between the sound (edge tones) generated when a rigid wedge is used, and that when a fixed‐free vibrating blade is employed. A characteristic kind of “resonance” is found, similar to that reported by others for analogous systems in air.

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