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Sound Mirrors/Acoustic Locators

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A military curiosity was intriguing me for years, my first contact with the concept was in an old Tintin inter-wars comic book.

Today, some minutes ago, I've received a spam mail with photos of sonic locators, it had remembered me the matter, some minutes of web search, and here post some links about the topic:

http://www.aqpl43.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm

http://en.wikipedia.org/wiki/Acoustic_mirror

http://en.wikipedia.org/wiki/Sound_ranging

http://www.doramusic.com/Radar.htm

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