Word: bulbs
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Dates: during 1888-1888
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...lifting the upper one a little by a mechanical arrangement. The powerful current, in overcoming the resistance offered by the air, heats the carbon tips to a white heat. In the incandescent lamp the resistance is offered by a filament of carbon encased in an air-tight glass-bulb. The current required to drive an are light will drive twenty-four 16-candle incandescent lamps...