Dalgleish, Sharon
January 2003
Bright Ideas;2003, p18
Book Chapter
In the 1830s, the telegraph was invented. It sent a code of beeps along wires over long distances. The code had to be sorted back into words at the other end. In 1876, Alexander Graham Bell invented the telephone through which the human voice could be sent along a wire and heard at the other end. At the telephone exchange, operators had to join telephone wires so people could talk to each other.


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