sirens (sound devices)

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  8. sound signaling devices
  9. sirens
Scope note
Devices for producing sounds, consisting essentially of a disk pierced with holes arranged in a circle, rotated over a stream of compressed air, steam, or fluid, so that the stream is alternately interrupted and allowed to pass; their uses include giving signals or warnings and producing musical tones.
sirens
Accepted term: 27-May-2024