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accoustic mirrors

Photos Accoustic Mirrors

https://www.bbc.com/news/in-pictures-46348917?fbclid=IwAR3mUNMEfsrkQnJgnfUGvlR7lKF_MHC8ymr69wcnA2sbMNWXOdfdtXQtSlI "More than 100 years ago acoustic mirrors along the coast of England were used to detect the sound of approaching German zeppelins. The concave concrete structures were designed to...
- ENGINEER
- Thread
- Jan 7, 2019
- accoustic mirrors sound mirrors
- Replies: 4
- Forum: World war one

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