The 'war tubas' we used to spot warplanes before radar - CNN Style - discu.eu

Hacker News

The 'war tubas' we used to spot warplanes before radar (2018) https://edition.cnn.com/style/article/war-sound-locators-before-radar/index.html 24 comments 28/5/2020

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The 20th century 'war tubas' used to spot warplanes before radar http://edition.cnn.com/style/article/war-sound-locators-before-radar/index.html 4 comments 16/12/2018 worldnews

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Ukraine Using Thousands Of Networked Microphones To Track Russian Drones https://www.twz.com/land/thousands-of-networked-microphones-are-tracking-drones-in-ukraine 21 comments

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