Early warning sound mirrors - Andrew Grantham provides photographs and details of surviving early 20th-century acoustic mirrors on the British coast designed to provide early warning of enemy aircraft.

		Sunday, 23 November, 2008
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Early warning sound mirrors

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	Andrew Grantham provides photographs and details of surviving early 20th-century acoustic mirrors on the British coast designed to provide early warning of enemy aircraft. Sponsored Links:
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Title:	Early warning sound mirrors on the British coast
Description:	Photographs of accoustic early warning sound mirrors on the British coast
Category:	World - System - First - Acoustic - Sound - Early - Mirror - Coastal - Britain - Zeppelin - Warning - Defences

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