Westinghouse metallized carbon-filament incandescent lamp, circa 1905. Brass medium-screw base with glass insulator. Two single-arch metallized carbon filaments with a center support/connector, carbon paste connectors, two-piece leads, cotton insulator. Tipped straight-sided envelope.
First generation GEM (General Electric Metallized) lamp. GE's Willis Whitney used his new electric resistance furnace to bake regular carbon filaments at high temperatures in a hydrocarbon atmosphere. The resulting filament took on properties more akin to metal filaments than carbon, and gave 20 percent better energy efficiency. GE introduced the product in 1904 and Westinghouse licensed and produced their own version of these lamps.
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