Bell Telephone, Exterior and Cutaway View, 1876

Exterior and cut-away views of the Bell telephone, 1876. A telephone converts sound, typically and most efficiently the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances, and replays such signals simultaneously in audible form to its user. In 1876, Scottish-American Alexander Graham Bell was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice. This instrument was further developed by many others

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Colorised Colorization Diagram Enhancement Impulses Method Receiver Technological Tele-communication Telecommunication Transmission Transmitter

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