England, Kent, Denge, 20ft and 30ft Experimental Sound Mirrors built in 1928 and 1930, precursor to RADAR, at Greatstone.

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Size: 3411px × 5125px
Photo credit: © Bob Battersby / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 1920s, 1930s, air, concrete, defence, denge, device, dr, england, english, experimental, greatstone, historic, kent, lakes, listening, mirrors, monument, radar, reserve, rspb, sansome, sound, tucker, uk, william