feb 4, 1878 - Light bulb

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Thomas Edison invented the incandescent ligh bulb witht lots of more inventions, just like the telegraf. Thomas realized that lot of scientifics had started to fing a way to produce light the most effectively and economically it could be, so he decided to create his own. He started the research and finally got an example of and incandescent ligh bulb. THis light was made with a glass bulb that had gas(nitrogen) , a filament , two wires and finally at the bottom it had an electrical contact.
It was a very important invention because it create a new way to have light without being that dangerous as the incandescent light was and also because it helped to work in better conditions.

http://www.history.com/topics/inventions/thomas-edison

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