Joe Bader tried setting the two tones of his invention four notes apart on the musical scale, but the result sounded like music, not a siren. Same thing when he played around with a five-note interval.
From The New York Times
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The New Police Siren: You
By The New York Times
March 3, 2011
![[article image]](https://cacm.acm.org/system/assets/0000/4817/3311.nytimes.police.siren.large.jpg?1476779420&1299181843 "Police siren")
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