Sound Ledger¹ (LRAD, Nollet, Leaf Blower Legislation)

Audio culture by the numbers

80,000: cost in $US of four LRADs (long-range acoustic devices) purchased by the Austin, Texas, police department between 2011 and 2016

1743: the year Jean-Antoine Nollet, French Catholic abbot and scientist, “confirmed that sound carried in water”

100: more than that number of U.S. cities “have put some restriction on gas-powered leaf blowers”


LRAD: Nollet: Blowers:

Originally published in the August 1, 2022, edition of the This Week in Sound email newsletter. Get it in your inbox via

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