Britain used these “Concrete Acoustic Mirrors” to detect enemy aircraft before radar

Arch2O.com
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Have you ever wondered if there was a way to detect aircraft before the invention of the radar system in 1935? Well, yes there was, actually, a system known as ‘acoustic mirrors’ which the British started to use 20 years before that. The system was developed by William Sansome Tucker, a pioneer in acoustical research, […]

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