a website collaboration between Science Service and the Smithsonian Institution

possibly 1939 - lumps are 1/100th of an inch across, they are the carbon grains for transmitter-filling

CARBON GRAINS

CD 1966088 E&MP33.022

Electric Power

11/4/19??
possibly 1939

Looks like a coal-pile; but the lumps are 1/100th of an inch across. They are the "carbon grains" for transmitter-filling.  


Original Caption by Science Service
Western Electric



National Museum of American History

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