How Edison invented the electric light.

1874, two electrical technicians in Canada applied for a patent for electric light: nitrogen was filled under a glass bulb and charged carbon rods were used to emit light, but they did not have enough financial resources to continue to improve this invention, so they sold the patent to Edison in 1875. Edison tried to improve the filament after purchasing the patent, and finally made a carbonized bamboo filament lamp that could last for 1200 hours in 1880.

However, after the US Patent Office ruled that Edison invented the carbon filament incandescent lamp, the patent was invalid. After years of litigation, Henry Goebbels won the patent, and finally Edison bought it. In Britain, Swan accused Edison of patent infringement. Later, they settled out of court and set up a joint venture company in Britain on 1883. Swan later sold his shares and patents to Edison.

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Edison was not only an inventor, but also an inventor entrepreneur. Thomas p Hughes, an American technical historian, called him a "system builder". According to Hughes' research, Edison was problem-oriented at the beginning of designing and building the power system, that is, how to make the power system more competitive than the original gas lighting system in price.

After determining this core problem, Edison determined the defect of the system-filament material through market research, cost analysis and theoretical calculation, turned a commercial problem into a scientific problem, and finally put forward the solution of high resistance spiral filament. At the same time, Edison did not fight alone, but managed a talented team, including experts in mathematics and physics, experienced technicians, and people who were good at socializing and familiar with the financial industry.

Thanks to the efforts of Edison and his team, the electric lighting system has moved from Menlo Park's laboratory to new york, the United States and even the whole world. It can be said that Edison really completed the transformation from electric lamp to electric lamp lighting system, which is of milestone significance in the history of electric lamp invention.

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