The Birth of the Telephone

In 1876, Alexander Graham Bell invented a 'talking device' which could transmit a human voice to a listener.
However, Bell's device produced an extremely weak flow of audio current from the sending device, accompanied by a high level of static that made it difficult to hear. Research in transmitters continued until in 1878 Thomas Edison invented the carbon transmitter, a more practical device with much better characteristics which is still used today. The principle of the receiver has not changed.

How the Bell Telephone works

Alexander Graham Bell
Born in Great Britain in 1847, Bell came to the U.S. at age 26 as professor of vocal physiology at Boston University.


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