Thomas? Is Edison the greatest inventor in history?

Some people think that Thomas is the greatest inventor on the grounds of him? Alva? Thomas Alva Edison (1847- 193 1), known as the "genius of Menlo Park", has more than 1 300 invention patents in his life, more than any inventor in American history. His most famous inventions are: automatic telegraph, stock price machine, phonograph (1877), incandescent lamp (1878) and film projector (189 1). Edison also made important scientific discoveries. He found that when the cathode of an electronic vacuum tube is heated, it will release electrons, which is later known as the "Edison effect". Edison set up a laboratory in his twenties. There are more than 50 engineers in the laboratory doing experiments with him. He called the workshop in Newark, New Jersey an "invention factory". This laboratory lasted for 6 years, and Edison completed nearly 200 patented inventions here.