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History of the telephone. Actor portraying Alexander Graham Bell in a 1932 silent film. Shows Bell's second telephone transmitter ( microphone ), invented 1876 and first displayed at the Centennial Exposition, Philadelphia.
Telephone, an instrument designed for the simultaneous transmission and reception of the human voice. It has become the most widely used telecommunications device in the world, and billions of telephones are in use.
A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.
9 nov 2009 · Alexander Graham Bell is known for his many inventions, especially the telephone and a metal detector. He later created the Bell Telephone Company, now AT&T.
In the 1870s two American inventors, Elisha Gray and Alexander Graham Bell, each independently, designed devices that could transmit speech electrically. Gray’s first device made use of a harmonic telegraph, the transmitter and receiver of which consisted of a set of metallic reeds tuned to different frequencies.
An actor portraying Alexander Graham Bell speaking into an early model telephone. The invention of the telephone was the culmination of work done by more than one individual, and led to an array of lawsuits relating to the patent claims of several individuals and numerous companies.
19 apr 2024 · Alexander Graham Bell, Scottish-born American inventor, scientist, and teacher of the deaf whose foremost accomplishments were the invention of the telephone (1876) and refinement of the phonograph (1886).
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