How does a telegraph transmit messages?

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"Telegraph operators sent signals using a device that interrupted the flow of electric current along a wire. They used shorter and longer bursts of current, with spaces in between, to represent the letters of the message in what became known as Morse code. A device at the receiving end converted the signals to a series of clicks that a telegraph operator or a mechanical printer translated into words." http://reference.howstuffworks.com/telegraph-encyclopedia.htm Sep 23 07, 3:41 AM