August 8, 2006 11:46 AM Subscribe
"From the first world war until the 30's air acoustics
played an important role in the air defence. Air vehicles carrying a weapon could not be located from the ground e.g. at night time or under cloudy conditions. As radar was still to be discovered, vision had to be supplemented
using the sound of the engines."
posted by mr_crash_davis (8 comments total)
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