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YouTubeCurious Core
The Machine Behind Air Raid Sirens
Rotary sirens like this one were built on a simple mechanical principle: a slotted rotor spinning inside a matching slotted housing repeatedly chops off the airflow, turning it into a rapid series of pressure pulses. Those pulses are what your ear reads as a loud, continuous tone, and the faster the rotor turns, the higher the pitch climbs ...
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