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    • Brass, spherical helmholtz resonator
    Rights: CC BY-SA 2.5 Published 7 October 2016 Size: 470 KB Referencing Hub media

    This is a brass, spherical helmholtz resonator based on Hermann von Helmholtz original design, circa 1890–1900.

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      Underwater acoustics – timeline

      This timeline gives key dates relating to the key developments in underwater acoustics. 1490 – First reports Leonardo da Vinci writes the first reports of listening to sound under water. “If you ...

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