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1937 - new high-efficiency tungsten filament, section of coiled filament, and a strand of human hair

FILAMENT SILHOUETTES

CD 1964014 E&MP25.072

Electric Lamps

May 10, 1937

At the top is shown enlarged silhouettes of a portion of a new high-efficiency tungsten filament for 60 watt Mazda lamps;

in the center, a section of coiled filament as has been used in 60-watt lamps,

and below the filament is a curved strand of human hair similarly enlarged.  


Original Caption by Science Service
General Electric



National Museum of American History

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