http://www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm
Here's the Japanese device:
Wednesday, May 24, 2006
Japanese War-Tubas
Check out this page of "Acoustic Locators," which includes this an incredible photo of so-called Japanese War-Tubas: devices that were supposed to pick up an extraordinary amount of sound to help locate enemy aircraft (pre-radar days, obviously). There are several devices from many countries on this page:
http://www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm
Here's the Japanese device:
http://www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm
Here's the Japanese device:
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