An acoustical device used before the invention of radar to detect incoming planes by sound. The stereo horns ran right into the operators ears, like gigantic headphones. To the right is a spotlight for nighttime operation.
Via Wikipedia
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An acoustical device used before the invention of radar to detect incoming planes by sound. The stereo horns ran right into the operators ears, like gigantic headphones. To the right is a spotlight for nighttime operation.
Via Wikipedia
