Sound Mirrors

There’s an interesting article on the BBC News website about the concrete sound mirrors erected on the British coast during the First World War. These were designed to catch and amplify the sound of incoming aircraft, and so give warning of air raids. The technology was apparently still being developed till the thirties, when it was supplanted by radar.

The article is here, at https://www.bbc.co.uk/news/in-pictures-46348917

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