1878: Edison creates his prototype incandescent light bulb: a thin strip of paper, attached to wires, enclosed in a vacuum inside a glass bulb. When electricity flowed into the paper "filament," it heated up, and glowed.
1882: Edison and partners form the Edison Electric Illuminating Company of New York, bringing electric light to parts of Manhattan. But progress was slow. Most American will still light their homes with gas light and candles for another fifty years. In 1925, only half of all homes in the U.S. will have electric power.
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Learn more about Edison at the NPS Thomas Edison National Historic Site.