The site gizmodo published this photo with reference as “SCR-270 Radar in the United States”
The product of nearly two decades of work by the US Signal Corps, the SCR-270 was the first radar detection system ever used by the Army. It took a team of nine to operate, and was only good up to 150 miles-more than enough to detect a Japanese plane on the morning of Pearl Harbor, though the warning went unnoticed.
It does not look exactli as other knoun photos (one, two, three). But what is it and what is the source of this photo?
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