![](//photos1.blogger.com/blogger/6674/1214/400/japaneswartubasacoustic2.jpg)
These
Japanese War Tubas (actually Imperial Japanese Military Acoustic locators) were used to acoustically detect planes in Japan during World War II before radar.
(via the
Utility Fog Blog via the
Athanasius Kircher Society via
Cabinet Magazine)
tags:
tuba,
history,
World War II,
acoustic locators
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