Bell's main achievement was the invention of the telephone. He also made hearing AIDS; Improved the phonograph invented by Edison; He made great contributions to the invention of deaf-mute language; He wrote 100 articles and pamphlets.
188 1 year, in order to find the bullet in American President james garfield, he designed a metal inspection device, which is the predecessor of the X-ray machine. He also founded the British Association for the Promotion of Deaf Education.
Bell was born in Scotland, England on 1847. His father has been engaged in deaf education all his life. Influenced by his family, he was interested in acoustics and linguistics since he was a child.
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Bell is also the oldest and best friend of Helen Keller, an American blind and deaf woman writer, educator, philanthropist and social activist.
Bell himself is an acoustic physiologist and a deaf-mute language teacher. Before him, the German Philip Rice had invented the telephone, but its sound transmission effect was too poor to be used in practice. On March 1876, Bell and his colleagues tested the world's first available telephone.
1877, the year after Bell invented the telephone, the first telephone line in Boston was opened, connecting Charles Williams' factory with his private residence in Somerville. It was also in this year that someone sent news information to the Boston Globe by telephone for the first time, and the era of using public telephones began.
1877, Bell Telephone Company, composed of Bell, Watson, Sandoz and Hubert, began to install telephones for some of the earliest families by renting telephones and telephone lines and charging royalties.
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