Alexander Graham Bell
(1847—1922) teacher of deaf people and inventor of the telephone
Inventor of the telephone. Bell followed his father in teaching his system of ‘visible speech’ to the deaf. In 1870 he emigrated to Canada and in 1873 was appointed professor of vocal physiology at Boston University. During his research Bell conceived the idea of the electrical transmission of speech. In March 1876 the first intelligible sentence was transmitted. He won a 50,000‐franc prize for his invention, which he used to establish the Volta laboratory for research into deafness.