History of electric light

The earliest practical electric lamp was an incandescent lamp, but before the birth of the incandescent lamp, the British Humphrey Davy made an arc lamp with 2000 batteries and two carbon rods, but this arc lamp was too bright and produced too much heat. Many and not durable, general places can not be used at all.

In 1854, Henry Goebel, a German watchmaker who immigrated to the United States, used a carbonized bamboo wire in a vacuum glass bottle to make the first practical electric light, which lasted for 400 hours, but he did not make it in time. apply for patent.

In 1860, the British Joseph Swan also made a carbon filament lamp, but he failed to obtain a good vacuum environment for the carbon filament to work for a long time. It was not until 1878 that the British vacuum technology developed to a desirable level that he invented a light bulb that was powered by carbon filaments under vacuum and obtained a British patent. Swann’s own house was the first private house in Britain to be lit by electricity.

In 1874, two electrical technicians in Canada applied for a patent for an electric lamp: nitrogen gas was filled under the glass bubble to emit light from an electrified carbon rod, but they did not have enough financial resources to continue to perfect the invention, so they sold the patent in 1875. to Edison. Edison tried to improve the filament after purchasing the patent, and finally manufactured a carbonized bamboo filament lamp in 1880 that could last for 1,200 hours.