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1933 - sodium vapor lamp set up for test in a spherical photometer

SODIUM VAPOR LAMP

CD 1966003 E&MP27.085

Electric Lighting

December 4, 1933

A sodium vapor lamp set up for test in a spherical photometer at Nela Park, Cleveland, General Electric Lamp headquarters. The light given off by such a lamp is monochromatic, assisting vision at the low intensities which prevail out of doors. 


Original Caption by Science Service
General Electric



National Museum of American History

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