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    Acoustic mirrors

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    • Jacqueline Samm

      Greatstone Sound Mirrors | Atlas Obscura ~ The massive concrete acoustic mirrors, or “listening ears,” lining the southeast coast of England were built between the world wars to monitor the skies for the telltale sounds of airborne invasion.

    • Ken McCarthy

      A primitive form of radar, acoustic mirrors were used as early-warning devices prior to WWII, with someone standing in front of the concave concrete holding a microphone to pick up the sound of aircraft approaching over the English Channel.

    • Tuvet

      Acoustic Architecture Engineering Structures War Parabolic Reflector Radar Sound Kent, England

    • Kathy Black

      Acoustic Mirrors at Denge, England - Sitting in the Kent countryside is a bizarre sight – abandoned, futuristic and incredibly archaic at the same time, the Sound Mirrors were once used as a monitoring system to detect aircraft approaching British shores. Also known as Listening Ears, Acoustic Mirrors and Concrete Dishes, the massive concave structures were designed to pick up the sound of approaching craft and magnify it into a microphone positioned at the center.

    • DeManneN VanNoorD

      Listening Ears These are concrete listening ears built in the 1930s (before World War 2). Airplanes flying across the channel could be heard by observers positioned near these "ears". Whilst they worked when the wind was favourable, the speed of sound v the speed of aircraft meant that they gave only a few minutes notice of impending attack. Annecdotally it was said that observers could hear the "Golden Arrow" train leaving Calais. They were made redundant with the advent of radar in 1938.

    • Ville Kansanen

      Acoustic Mirror Kent Great Britain - Acoustic mirror - Wikipedia, the free encyclopedia

    • Gianni Renda

      Denge acoustic mirrors -March2005 - Acoustic mirror - Wikipedia, the free encyclopedia

    • Natalie Rocha

      Refletores Acústicos de Denge, na Inglaterra. Fantásticos!

    • Jake Murphy

      Acoustic mirror - Wikipedia, the free encyclopedia

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