What did American scientist Bell invent?

American scientist Bell invented the telephone and hearing aid.

Bell also 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.

The life of the character

1847 On March 3rd, Alexander Graham Bell was born in Edinburgh, Scotland, where he received primary education.

Bell 1870 immigrated to Canada and arrived in the United States one year later. He became an American citizen on 1882.

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.