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From Wikipedia (Creative commons license)
Prior to World War II and the invention of radar, acoustic mirrors were built as early warning devices around the coasts of Great Britain, with the aim of detecting incoming enemy aircraft by the sound of their engines. The most famous of these devices still stand at Denge on the Dungeness peninsula and at Hythe in Kent.
The acoustic mirror at Abbot’s Cliff is located between Folkestone and Dover. It is a five to ten minute walk from the Folkestone road. Just follow the tarmac path along the cliff top and you really can't miss the concrete mirror.
Do you think that this kind of mirror was very effective?
|Published :||07/11/2015 (d/m/y) 17:22|
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