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1937 - testing high intensity mercury vapor lamp is really a tube within a tube

TESTING MERCURY VAPOR LAMP “INNER TUBES”

CD 1964066 E&MP27.028

Electric Lighting

1937

A high intensity mercury vapor lamp is really a tube within a tube. The smaller tube contains mercury vapor and is the source of light.

Here at the Westinghouse Lamp Division, Bloomfield, N.J., a worker is testing the inner tube, checking operating characteristics.

This is the type of lamp used to light working areas in the Douglas Aircraft Company plant in Long Beach, California. 


Original Caption by Science Service
©Westinghouse



National Museum of American History

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