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Echoes from the Sky: A Story of Acoustic Defence Paperback – 1 Sep 1999
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Between the World Wars, before the invention of radar, parabolic sound mirrors were used experimentally as early-warning devices by military air defence forces to detect incoming enemy aircraft by listening for the sound of their engines. During World War 2 on the coast of southern England, a network of large concrete acoustic mirrors was in the process of being built when the project was canceled due to the development of the Chain Home radar system. Many of these mirrors are still standing. This book tells their story.
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