Siren: large, electric motor driven.

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

Siren. Siren is powered by 12 V. D.C. car battery. It is very loud!
UCB Index: 
B+45+25
PIRA Index: 
3C20.30
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

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B+45+30 Compressed air jet blows through spinning disk with holes.