About 1,600 times, Edison invented electric light and tested nearly 1,600 materials.
On October 21, 1879, electric light was successfully developed. For this, Edison tested nearly 1,600 materials. After 45 hours of continuous use, the lamp filament burned out. It is mankind's first lamp of widespread practical value. This type of electric lamp has different names such as "high-strength incandescent lamp" and "carbonized cotton filament lamp" and is made of carbonized cotton filament.
In 1880, Edison sent assistants and experts to find suitable bamboos around the world, approximately 6,000 species. Among them, Japanese bamboo fiber is the most practical. It can continuously illuminate for more than 1,000 hours to achieve the goal of durability. This type of lamp is called "carbonized bamboo filament lamp".
Detailed information:
The twists and turns of Edison's invention of electric light:
In 1874, two Canadian electrical technicians applied for an electric lighting project Patent: fill with nitrogen gas under a glass bubble to emit light on a charged carbon electrode, but electrical technicians did not have enough money to continue improving the invention, so the patent was sold to Edison in 1875. Edison purchased a patent and attempted to improve the filament.
Finally, in 1880, Edison produced a carbonized bamboo filament lamp that lasted 1,200 hours. However, the U.S. Patent Office ruled that Edison's invention of the carbon fiber incandescent lamp was invalid. After years of legal battles, Henry Goebbels won the patent, which Edison eventually purchased from Goebbels' impoverished widow.
In England, Swann sued Edison for patent infringement. The matter was later settled out of court and a joint venture was formed in 1883. Swann later sold his shares and patents to Edison.
Baidu Encyclopedia - Electric Light
Baidu Encyclopedia - Thomas Alva Edison
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