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December 20 is the day when Thomas Edison demonstrated the working of the incandescent lamp
On December 1879, 20, American businessman Thomas Alva Edison demonstrated his invention - the incandescent lamp.
In 1878, Edison visited William Wallace of Ansonia, who was working on electric arc lamps with carbon electrodes.
Wallace presented Edison with a dynamo along with a series of arc lamps.
After that, Thomas begins to improve the lamps. In April 1879, the inventor discovered the crucial importance of vacuum in the production of lamps.
On October 1879, 21, Edison completed work on the carbon filament incandescent light bulb, which became one of the greatest inventions of the 19th century. Edison's greatest service was not in the development of the idea of the incandescent lamp, but in the creation of a practical, widespread electric lighting system with a strong filament, a high and stable vacuum and the possibility of using many lamps at the same time.