Acoustic Defense: Photo Series Reflects on Derelict British “Sound Mirrors”

[ By WebUrbanist in Abandoned Places & Architecture. ]

In the wake of World War I, the United Kingdom developed a powerful yet relatively low-tech architectural system for detecting incoming enemy airplanes, the remnants of which can still be found across the countryside.

Starting in the 1920s, these concrete sound mirrors would passively gather, reflect and concentrate acoustic waves, directing the sound to a listening post on the ground as part of an early warning alert...

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