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Your search for "sound mirror" resulted in the following result(s).

monument Word or Phrase:SOUND MIRROR (200 FEET) *  
Definition:A concrete, concave wall 200 feet in length used as an acoustic listening device to detect approaching enemy aircraft.
monument Word or Phrase:SOUND MIRROR (20 FEET) *  
Definition:A concrete, circular concave dish 20 feet in diameter used as an acoustic listening device to detect approaching enemy aircraft.
monument Word or Phrase:SOUND MIRROR (30 FEET) *  
Definition:A concrete, circular concave dish 30 feet in diameter used as an acoustic listening device to detect approaching enemy aircraft.
monument Word or Phrase:SOUND MIRROR BUILDING *  
Definition:A building housing the acoustic detection equipment for a sound mirror
monument Word or Phrase:SOUND MIRROR *  
Definition:An early warning structure built during and after WWI along the south and east coasts of England. Sound detecting acoustic dishes and walls could detect the sound of approaching enemy aircraft at a distance of 8 to 15 miles.

* Copyright of English Heritage (1999)

English Heritage National Monuments Record

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