On the Radar: The “Acoustic Mirrors” of Denge–a Pre-Radar Warning System

denge_acoustic_mirrors_-march2005

Located along British coastlines, parabolic concrete structures such as these once served as interwar, pre-radar warning systems. They focused and concentrated sounds from the Channel, with the goal of detecting the approach of enemy planes. Image: Wikipedia.

Read more here: Acoustic Mirror – Wikipedia, and the succeeding radar system: Chain Home – Wikipedia

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