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Spiegel.de: Vergessene Technologien - DER SPIEGEL
Mit haushohen Stahlbetonschalen lauschten die Briten in den Zwanziger- und Dreißigerjahren nach feindlichen Flugzeugen. Die Akustik-Experimente entlang der...
Spiegel.de: Listening for the Enemy: Giant Ears on the British Coast - DER SPIEGEL
The enormous concrete shells are as tall as a house, and they were designed to listen for enemy aircraft in the 1920s and 30s. Pre-World War II acoustic...
A history of our editors | Warrington Guardian
www.warringtonguardian.co.uk
THE first editor of the Warrington Guardian was the man who set it up - Alexander Mackie.
Before Radar, they used these giant concrete "Sound Mirrors" to...
www.thevintagenews.com
Dr. William Sansome Tucker developed early warning systems known as 'acoustic mirrors' around 1915, and up until 1935, Britain built a ...
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