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PugJesus@piefed.socialM to HistoryPhotos@piefed.socialEnglish · 1 day ago

Concrete acoustic mirror for long-range aircraft detection, Kent, UK, 1930

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Concrete acoustic mirror for long-range aircraft detection, Kent, UK, 1930

PugJesus@piefed.socialM to HistoryPhotos@piefed.socialEnglish · 1 day ago
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  • JustTesting@lemmy.hogru.ch
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    24 hours ago

    They’re still around, Tom Scott had a great video on these

  • username_1@programming.dev
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    1 day ago

    Future archeologists will be sure that satellites were already a thing in the '30s.

  • 🇰 🌀 🇱 🇦 🇳 🇦 🇰 🇮 @pawb.social
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    1 day ago

    Imagine standing in front of this thing and making jet noises.

  • PugJesus@piefed.socialOPM
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    1 day ago

    https://en.wikipedia.org/wiki/Acoustic_mirror

  • Evil_Shrubbery
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    1 day ago

    Along with a convenient microphone perch for birds right at the focal point …

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