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Early warning sound mirrors

  Link Details for: Early warning sound mirrors
Link Title: Early warning sound mirrors Open in a new window
Link URL: http://www.ajg41.clara.co.uk/mirrors/
Link Details: 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.
Category: Top : Science : Technology : Aerospace : Aeronautics : History
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Early warning sound mirrors