Odpowiedź:
On February 14, 1876, Graham Bell patented the telephone, one of the most important inventions in the history of mankind, which brought him fame and fortune.
Graham Bell was born in Scotland, he was a speech therapist, teacher of the deaf and also a music teacher. In 1870 he went to Canada and became professor of sound physiology at the University of Boston there. Bell wanted to construct a sound amplification device that would help the hearing impaired. These efforts, however, ended in failure. The constructed device was too large for a hearing aid. It turned out, however, that by combining two such devices, you will receive a tool for transmitting sound over a distance, i.e. a telephone.
Wyjaśnienie:
nie wiem reszty
