100 Things to Know About Inventions by Clive Gifford
Author:Clive Gifford
Language: eng
Format: epub
Publisher: Happy Yak
Published: 2021-12-15T00:00:00+00:00
LIGHT BULB
The first practical electrical lighting relied on incandescent light bulbs. These contain a thin filament of material that heats up, glows and emits light when electricity passes through. To stop the filament catching fire, the bulbs need to be emptied of air, a tricky process back then. In 1880, English scientist Joseph Swan demonstrated his airtight light bulbs (with cotton filaments) by first lighting a building (his home), then an entire street in Newcastle, England. Thomas Edison was also making light bulbs with longer-lasting filaments. In 1883, Edison and Swan formed a company to make electric lighting available for everyone.
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