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1931 - engineers study ultraviolet invisible to the unaided eye rays by means of photoelectric tubes

SEEING THE INVISIBLE

E&MP 95.004

Photo Electric Cells

February 11, 1931

Engineers of the research laboratories of the Westinghouse Electric and Manufacturing Company study ultraviolet invisible to the unaided eye rays by means of photoelectric tubes.

 


Original Caption by Science Service
© Westinghouse Electric



National Museum of American History

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