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1938 - a few of the many experimental mercury vapor lamps which Dr. J.W. Marston and his associates at the Westinghouse Co. developed in their research to find a more efficient light source

EXPERIMENTAL LAMPS

CD 1964046 E&MP27.004

Electric Lighting

February 1938

Here are a few of the many experimental mercury vapor lamps which Dr. J.W. Marston and his associates at the Westinghouse Co. developed in their research to find a more efficient light source. 


Original Caption by Science Service
©Westinghouse



National Museum of American History

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