However, Edison failed many times and soon spent 50 thousand dollars. The beliefs of some shareholders began to waver. Edison tried hard to persuade the shareholders to give Edison another $50,000.
1879 65438+1October 2 1, the electric lamp was successfully developed. He tried nearly 1600 materials for this purpose, and the filament of this electric lamp was burned out after 45 hours of continuous use. This is the first electric lamp with wide practical value. This kind of electric lamp includes "high resistance incandescent lamp" and "carbonized cotton filament lamp".
From 65438 to 0880, Edison sent assistants and experts all over the world to find suitable bamboos, about 6000 species, of which carbon fibers made of Japanese bamboo are the most practical, which can last for more than 1000 hours, achieving the purpose of durability. This kind of lamp is called "carbonized bamboo filament lamp".
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Character evaluation:
Hoover, the 3rd1President of the United States: "He is a great inventor and a benefactor of mankind." Facing everything around him calmly and facing life optimistically until death is Edison's attitude all his life. ?
Edison's cultural level is extremely low, but his contribution to mankind is so great. Edison not only has a curious heart and an instinct to try by himself, but also has unlimited energy and courage beyond ordinary people to work hard.
Edison made so many inventions in his 84-year life, and he has been persistently devoted to inventions. In addition to his inventions and contributions in phonograph, electric light, telephone, telegraph and film, he also has many creations and opinions in mining, architecture and chemical industry, and has made great contributions to the progress of human civilization.
Baidu encyclopedia-Edison