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All the United Kingdom England Greatstone Greatstone Sound Mirrors
AO Edited

Greatstone Sound Mirrors

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Greatstone, England

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Joshua Foer
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The sound mirrors.   Tom Lee/CC BY-ND 2.0
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The sound mirrors.   Jksolomon/CC BY-SA 3.0
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About

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.

Built between 1927-30, the sound mirrors were part of Britain's national defense strategy. Their parabolic shape collected and magnified sound waves in the air over the English Channel and directed them at a microphone positioned just in front of the parabola. Anti-aircraft defenses were then deployed. The mirrors effectively gave Britain a fifteen-minute advance warning of an impending attack.

The site features three different reflectors, including a 200-foot-long curved wall, a 30-foot-tall parabolic dish, and a smaller 20-foot-tall shallow dish. All three can be seen in Greatstone, located on the northeast side of the Dungeness Nature Reserve.

Check the RSPB website for occasional open days and tours.

Update as of June 2021: This site is now gated. 

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Josh

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desraypreston, danshortwork, Kerry Wolfe, europafox

  • desraypreston
  • danshortwork
  • Kerry Wolfe
  • europafox

Published

July 28, 2012

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  • http://www.theromneymarsh.net/history/mirrors.htm
Greatstone Sound Mirrors
Greatstone, England, TN28 8SB
United Kingdom
50.955607, 0.953612
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Photo of England

England

United Kingdom

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Stories 144

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Photo of England

England

United Kingdom

Places 2,199
Stories 144

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