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STORIES OF INVENTIONS AND DISCOVERIES


Invented by: Joseph Swan, Thomas Edison
Nationality: Scottish, American Date: 1879, 1880
Purpose: to provide an electric light-source, to replace gas light or candles
The electric light bulb was an almost unbelievable coincidence: two inventors produced almost the same idea, independently, at about the same time.
Joseph Swan was first, by a whisker, but didn't patent his idea. Edison started making bulbs, and accused Swan of copying. Luckily for Swan, there was a small difference between the processes. The problem was solved by Edison and Swan forming a joint company to produce bulbs.
The modern light bulb consists of a filament (coiled tungsten wire) through which electricity flows. The filament becomes extremely hot and glows brightly inside the glass bulb. Early bulbs used bamboo, and even coated cotton thread, as a filament. Tungsten is better.