On October 21, 1879 American inventor Tomas Edison tested one of the most important inventions of the XIX century - the electric light bulb. His bulb worked for 40 hours. Later Edison managed to increase this time to a few hundred hours and made it practical and cheap enough for mass-production to begin. Edison’s predecessors used a carbon fiber filament. Edison patented the bulb with a platinum filament, but continued the search for cheaper metal and did a total of 1,500 studies of different materials. Nowadays only filaments made of tungsten are used for bulbs.
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