An aerial photograph of the sound mirrors at Denge. Just how close these structures were to disappearing into the flooded mineral extraction workings can be clearly seen.
Just how close these structures were to disappearing into the flooded mineral extraction workings can be clearly seen
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on Sunday, August 9th, 2009 at 19:00 and is filed under Individual mirrors, Sound mirrors.
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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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