Camera Tubes
Graphechon Storage Tube
Prototype double sided target magnetic deflection Graphechon tube, early 1940's. The Graphechon tube was developed to make long time storage of television quality pictures possible. Its original use was to store RADAR PPI patterns and generate television pictures from this. There are two electron guns, one at each end of the tube and a target in the center, one gun would "write" the picture on to the target while the other would "read" the pictures and develop the television signal .
From RCA Review, March 1949
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