Edison was born in Milan, Ohio, and died in West Orange, New Jersey, USA. Inventors and entrepreneurs. Edison was the first person in human history to make use of a large number of production principles and electrical engineering research laboratories to patent inventions, which had a far-reaching impact on the world. His invention of the phonograph, movie camera and electric light had a great influence on the world.
He had more than 2,000 inventions and 1000 patents in his life. Edison was named the ninth among the 65,438+000 people who influenced the United States by the authoritative American periodical Atlantic Monthly.
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1877, Edison found that the diaphragm in the telephone transmitter would vibrate with the voice of speech, so he took a short needle and did an experiment, from which he was greatly inspired. So he began to study the problem of sound reproduction. /kloc-In August of 0/5, Edison asked his assistant to make a "strange machine", which consisted of a big cylinder, a crank, a receiver and a diaphragm. When it was done, Edison took out a piece of tin foil.
It is wound on a metal cylinder with a spiral groove, so that one end of the needle gently rubs the tin foil and rotates, and the other end is connected with the receiver. Then Edison shook the handle, sang into the receiver, put the needle back, shook the handle again, and then the machine played back Edison's voice. In February 65438, Edison publicly demonstrated this "tin foil cylinder phonograph", which caused a sensation all over the world.
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