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ELECTRIC LIGHTS

About 1880 it was discovered that the passage of an electric current through a thin carbon filament caused it to give out light, and it was soon found that if the filament was enclosed in a glass bulb from which the air had been extracted, it would not burn away. The modern electric lamp is very similar, but the carbon filament is replaced by a fine coiled metal wire, and the bulb contains nitrogen and argon gas.

LIGHT BULBS

ELECTRIC TORCH

ELECTRICITY, EARLY DAYS

LIGHTING