Scottish inventor Alexander Graham. Bell (1847-1922) devised the first apparatus capable of transmitting the human voice at a distance with the aid of electricity, which he called phone. Bell, a graduate of the Universities of Edinburgh and London, moved to his native Canada and from there he moved to Boston, United States, where he founded a school for deaf and was appointed professor of vocal physiology at the local university. With the assistance of Thomas Watson electric instruments designed to teach you to speak to people with hearing disabilities. From these studies, in 1875 first succeeded in transmitting the sounds and in 1876, an intelligible sentence. The phone was quickly refined and just invented a year later founded the Bell Telephone Company and began mass-produced.
Telephony experienced tremendous growth in the early twentieth century, with the spread of automatic central communications gained independence from human operators.
The entrepreneur and inventor Alexander Graham Bell, surrounded by his colleagues, do one of the first submissions in the history of telephony.
On the basis of a microphone and a receiver, that were created previously. The microphone control the flow of a circuit to operate the receiver. This generated a similar sound emitted through the microphone.