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1944 - mercury arc lamp can be changed instantly from low to high intensities or vice versa

MERCURY ARC LAMP

CD 1966008 E&MP27.090

Electric Lighting

October 8, 1944

Mercury arc lamp, shown in the picture, is a new type that operates on 85 watts input and has specially designed heater coil to permit operation with a wide intensity range.

It can be changed instantly from low to high intensities or vice versa.

It was designed primarily for the motion picture industry. 





Original Caption by Science Service
Handy & Boesser Photographers
Hanovia Chemical & Mfg., Co.



National Museum of American History

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