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at the 11:32 mark, the “japanese war
tuba” ?w
vhttp://mashable.com/2015/02/16/war-tubas-radar-wwi/
Aircraft engines produced unprecedented sound, so in order to hear them at a distance, the war efforts developed listening devices. Some were small and portable, for the use of one person. The operator listened using stethoscope-style headphones.
But detecting engine noises at greater distances allowed more time to prepare a response. Large and elaborate detectors were experimental, and their efficiency varied widely. A number of designs were quite striking, such as the Japanese acoustic locators nicknamed “war tubas.”
Their use continued until the early years of WWII, but increases in aircraft speeds and the development of radar rendered them obsolete.
1930s
An early radar system in operation at an aerodrome in the south of England.
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