Military Wednesday - Acoustic Mirrors

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Wednesday, Jun 30 2010 by

An acoustic mirror is a passive device used to reflect and perhaps to focus (concentrate) sound waves.

Prior to World War II and the invention of radar, acoustic mirrors were built as early warning devices around the coasts of Great Britain, with the aim of detecting airborne invasions. Acoustic mirrors had a limited effectiveness, and the increasing speed of aircraft in the 1930s meant that they would already be too close to deal with by the time they had been detected. The development of radar put an end to further experimentation with the technique.

200' Sound Mirror (Bing Maps)
200' Sound Mirror

200' Sound Mirror (StreetView)
200' Sound Mirror
Boulby Sound Mirror (Bing Maps)
Boulby Sound Mirror

Boulby Sound Mirror (StreetView)
Boulby Sound Mirror

Abbot's Cliff Sound Mirror (Google Maps)
Abbot's Cliff Sound Mirror

WWI Sound Mirror (Google Maps)
WWI Sound Mirror
WW1 concrete acoustic mirror (Google Maps)
WW1 concrete acoustic mirror