Experimental acoustic sound mirrors 20' 30' 200' forerunner of radar provide early warning incoming enemy aeroplanes airships 1916 - 1930s ww1 ww2


Size: 4912px × 7360px
Location: Denge, Dungeness, Romney Marsh, Kent, UK
Photo credit: © Yon Marsh / Alamy / Afripics
License: Licensed
Model Released: No

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