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Stone ears (3 photos)




Huge stone sounding board (mirror) were used for experiments in England during World War II to determine the aircraft flying up. In the center was a microphone, which amplifies the sound and analyzed already lyudmi



Pictures
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76 rare, 02-carat diamond, formerly owned by Archduke of Austria.
...
Unbelievable aviaproekty WWII
...
50 facts about gold
...
Gadgets CIA agents
...
70 bridges over 150 years
...
Secrets of the Egyptian pyramids
...
Powerful fortress in Landskrona
...
Set CIA spy (23 photos)
...
Monuments like the wreckage of an alien civilization
...
Drawings on Soviet aircraft of World War II
...
76 rare, 02-carat diamond, formerly owned by Archduke of Austria.
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