Thomas Edison, Thomas Edison lightbulb,

In Menlo Park, California, Thomas Edison secretly tested incandescent light in 1879.

December 20 Thomas Edison, Thomas Edison lightbulb,

An incandescent light bulb, incandescent lamp, or incandescent light globe is a type of electric light that uses a wire filament that is heated until it lights. To protect the filament from oxidation, it is encased in a glass bulb with a vacuum or inert gas. The filament was the source of the difficulty with Swan's design, Edison understood. A thin filament with a high electrical resistance would make a lamp feasible since it would only take a little amount of electricity to light up. In December 1879, he displayed his lightbulb.

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