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Regine April 9, 2005 sound, vintage

Acoustic radars

Acoustic location was used during mid-WW1 for the passive detection of aircraft by picking up the noise of the engines. It was rendered obsolete by the introduction of radar.

frloc1a[1].jpg

This one is French and each of the four hexagons carries 36 small hexagonal horns.

Via del.icio.us.

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