Compressed air jet blows through spinning disk with holes.

Air through holes on rotating disk generates sound. This apparatus can be mounted horizontally, as shown, or vertically,- with the disk facing the class. Compressed air is blown through the holes in a ring as it rotates, making a sound. The frequency of the sound is higher toward the outer ring, and depends on the speed of rotation.
UCB Index: 
B+45+30
PIRA Index: 
3C20.30
Demo Diagram: 

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