Echoes from the Sky: A Story of Acoustic Defence |
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200 foot mirror 200ft mirror 30 foot Abbots Cliff Acoustic Research Station Acoustical Mirror Acoustical Station ADEE aeroplane Air Defence Experimental Air Ministry aircraft Anti-Aircraft apparatus Bawdsey beam Biggin Hill Britain Captain Tucker carried centre coast Colonel Commander concrete construction control room Defence Experimental Establishment Denge mirror detection device disc system Dover Dr Tucker Dungeness electrical equipment experiments Faraday Building feet Ferguson flights Flying Boat forecourt front Handford height Hythe Imber Court included installation involved Joss Gap July June Kent letter Lieutenant Maghtab Malta Mark VIII memorandum method microphones miles mirror at Denge mirror at Hythe mirror system mounted noise North Foreland observer Office operation paraboloid photographs Plate plotting position problem proposed radar Railway range reference Romney Marsh Royal Engineers Board searchlight sight Signals Experimental Establishment sound collector sound mirrors stethoscopes Superintendent tests Thames Estuary Tizard trumpet Valletta wrote