Photo Gallery: Britain's Forgotten Sound Mirrors
Foto: Robert Riddle
Fotostrecke

Photo Gallery: Britain's Forgotten Sound Mirrors

Listening for the Enemy Giant Ears on the British Coast

The enormous concrete shells are as tall as a house, and they were designed to listen for enemy aircraft in the 1920s and 30s. Pre-World War II acoustic experiments led to some extraordinary architecture -- and to a remarkably effective technology which ultimately succumbed to the invention of radar.
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