Bell ringing in a jar evacuated with pump.

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(B)Waves - B+45: Sound Spectrum/Sources

Bell ringing in a slowly evacuated (or aerated) chamber. The vacuum flask apparatus has a valve to either pump air out or let air in. The sound diminishes fairly rapidly as air is pumped out of the chamber.
UCB Index: 
B+45+15
PIRA Index: 
3B30.30
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

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B+45+10 Ultrasound transducers (40 kHz) as both sources and receivers.
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B+45+20 Savart's wheel: Toothed wheel and cardboard or air jet.