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Ultrascope, New Aid to Medical and Industrial Research.-L4 new electron tube, called the "ultrascope," which is expected to be a substantial help in medical and industrial research was demonstrated recently by the Radio Corporation of America. The tube is the "eye" of ;I new simple attachment for a microscope, which for the first time allows direct visual focusing of an image under ultra- violet light.
It converts invisible ultraviolet images of specimens into visi-
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