Sound Mirrors
Built between 1927-30, the sound mirrors were part of Britain’s national defence strategy. They were designed to pick up the sound of approaching enemy aircraft; sound waves were caught in the belly of the mirror and relayed back through microphones and a stethoscope to an operator who raised the alarm. The trouble was that as planes got bigger, better and faster, it was no longer possible to identify the enemy – it turned out they couldn’t tell the difference between a Zeppelin and a Spitfire. This, together with the massive advances in radar technology and increased noise pollution, rendered the mirrors obsolete. (Greatstone, England)
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