Joss Gap sound mirror
During World War I there was a sound mirror at Joss Gap in Kent. Details
Sound Mirrors
Acoustic early warning systems, spectacular remnants of a dead-end technology on the British coast
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A forerunner of radar, acoustic mirrors were built on the south and northeast coasts of England between about 1916 and the 1930s. The ‘listening ears’ were intended to provide early warning of incoming enemy aircraft.
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Sound mirrors
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