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Fight Against Maturity

Museum Waalsdorp: Air Acoustics

sounddetectionparabol.gifIn the 1930’s, before the development of radar, early warning detection of the approach of enemy aircraft was haphazard at best and propposals were made for setting up listening locations distributed over a wide area. The unaided ear proved inadequate to the task and so some sort passive listening devices with better capabilities than the ear were needed to trace the sound of incoming airplanes. The general idea was “the bigger the ear, the better” and some strange looking devices were developed. Here’s one example.

Starting about 1930 different versions were tested and it appeared that a miniature version of  parabolic reflectors (left) produced the best results, among other things because these preserved the “sound image” best. According to a report from 1935 a number of these devices were produced.

More at Museum Waalsdorp: Air Acoustics

August 8, 2006 - Posted by | Uncategorized

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