Who invented the electric light?

It is generally believed that the electric light is American Thomas? Edison invented it. But if you examine the evidence carefully, another American, Henry? Goebbels (Heinrich? Bell) had invented the reliable light bulb with the same principle and materials decades before Edison, and many people had made many contributions to the invention of the light bulb before Edison. 180 1 year, British chemist David electrified platinum wire to make it glow. 18 10, he also invented the electric candle, which was illuminated by an arc between two carbon rods. 1854 Henry? Goebbels used a carbonized bamboo filament and put it under a vacuum glass bottle to make it glow. Today, his invention seems to be the first incandescent lamp with practical value. The light bulb he tested at that time could last for 400 hours, but he didn't apply for a design patent immediately.

1850, English Joseph? Wilson? Joseph Wilson Swan began to study electric lights. 1878, he obtained a British patent for a light bulb powered by carbon wire under vacuum, and started to set up a company in Britain to install electric lights in every household.

1874, two Canadian electrical technicians applied for a patent for electric lamps. They filled helium gas under the glass bubble, and the charged carbon rod would glow. But they didn't have enough financial resources to continue developing this invention, so they sold the patent to Edison at 1875.

Edison tried to improve the filament after buying the patent. 1879, he changed to carbon filament to make a light bulb, which successfully lasted 13 hours. By 1880, his carbonized bamboo filament bulb had been successfully maintained in the laboratory for 1200 hours. But in Britain, Swan sued Edison for patent infringement and won. Edison's electric light company in England was forced to make Swan a partner. But later Swan sold his rights and patents to Edison. In America, Edison's patent has also been challenged. The United States Patent Office once ruled that his invention had a criminal record and was invalid. Finally, after years of litigation, Edison obtained the patent right of carbon filament incandescent lamp.