Can you hear me NOW?

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Acoustic radar was widely used from mid-WW1 to the early years of WW2 for the detection of aircraft by picking up the noise of the engines. It was rendered obsolete during WW2 by the introduction of radar, which was far more effective as you might imagine.

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via thechive.com

Vintage shots of acoustic tracking devices.

http://thechive.com/2010/05/06/vintage-shots-of-acoustic-radar-19-photos

Posted via web from Fred's posterous