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Aircraft detection before radar, 1917-1940
Jan 30, 2017 21:38:02 #
Jan 30, 2017 21:45:12 #
Here one made of stone. During World War 2
https://en.m.wikipedia.org/wiki/Acoustic_mirror
http://www.andrewgrantham.co.uk/soundmirrors/
Watched this on PBS.
Not very mobile though.
https://en.m.wikipedia.org/wiki/Acoustic_mirror
http://www.andrewgrantham.co.uk/soundmirrors/
Watched this on PBS.
Not very mobile though.
Jan 30, 2017 21:50:35 #
Very interesting read/images my we have come a long way. Thanks for the share.
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Jan 30, 2017 21:56:00 #
dirtpusher wrote:
Here one made of stone. During World War 2
https://en.m.wikipedia.org/wiki/Acoustic_mirror
http://www.andrewgrantham.co.uk/soundmirrors/
Watched this on PBS.
Not very mobile though.
https://en.m.wikipedia.org/wiki/Acoustic_mirror
http://www.andrewgrantham.co.uk/soundmirrors/
Watched this on PBS.
Not very mobile though.
True.Jan 30, 2017 21:56:51 #
lightcatcher wrote:
Very interesting read/images my we have come a long way. Thanks for the share.
My pleasure.
Jan 30, 2017 22:00:07 #
Dan Downie
Loc: Rochester, NY
Fascinating! Many of them are comical looking. I wonder how they distinguished between friend and foe? Thank you for sharing!
Jan 30, 2017 22:03:28 #
Dan Downie wrote:
Fascinating! Many of them are comical looking. I wonder how they distinguished between friend and foe? Thank you for sharing!
As I recall the German aircraft engine sounds were a little different than the British planes. But I would imagine any sound of an approaching aircraft would have been reason for concern.
Jan 31, 2017 07:25:46 #
Jan 31, 2017 11:19:17 #
tom cody wrote:
Fascinating, thanks for the link. The B&W photos have great resolution
My pleasure Tom.
Jan 31, 2017 17:36:59 #
Jan 31, 2017 17:38:41 #
Spectre wrote:
This would make a great commercial. "Can you hear me now?"
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