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Hy-Lo light bulb, ca. 1904

Hy-Lo light bulb, ca. 1904

Item 74873 zoom send e-card Share this on Facebook Share this on Twitter

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This "Hy-Lo" light bulb, developed by the Economical Lamp Division of General Electric, used two carbon filaments connected to different poles of a rocker switch on the side of the bulb base. One filament gave brighter light than the other.

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