Telegraph
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The electric telegraph, which was developed in the mid-19th century, was the principal means of transmitting printed information by wire or radio wave for more than 100 years. The idea of using electricity to communicate over distance is said to have occurred to Samuel F. B. Morse during a conversation aboard ship when he was returning from Europe in 1832. Michael Faraday's recently invented electromagnet was much discussed by the ship's passengers, and when Morse came to understand how it worked, he speculated that it might be possible to send a coded message over a wire. In 1843, Morse asked Congress for the $30,000 that would allow him to build a telegraph line from Washington to Baltimore, forty miles away.
Morse had hired the ingenious construction engineer Ezra Cornell to lay the pipe carrying the wire, and although Cornell did his job superbly, one of Morse's partners, Congressman F. O. J. Smith, had purchased wire with defective insulation. Too much time had been wasted laying bad wire, and with the project on a rigid deadline, something had to be done quickly. Cornell suggested that the fastest and cheapest way of connecting Washington and Baltimore was to string wires overhead on trees and poles. The desperate Morse gave the go-ahead, and the line was completed in time for the dramatic and spectacularly successful link between the Supreme Court chamber of the Capitol building and the railroad station in Baltimore.
Soon, as overhead wires connected cities up and down the Atlantic coast, the dots-and-dashes method that recorded messages on a long moving strip of paper was replaced by the operator's ability to interpret the code in real time (once the receiver was given two different types of "stop" pin that each made a different sound) and transcribe it into English letters as he heard it. Telegraph lines soon extended westward, and within Morse's own lifetime they connected the continents of Europe and America.
Morse had hired the ingenious construction engineer Ezra Cornell to lay the pipe carrying the wire, and although Cornell did his job superbly, one of Morse's partners, Congressman F. O. J. Smith, had purchased wire with defective insulation. Too much time had been wasted laying bad wire, and with the project on a rigid deadline, something had to be done quickly. Cornell suggested that the fastest and cheapest way of connecting Washington and Baltimore was to string wires overhead on trees and poles. The desperate Morse gave the go-ahead, and the line was completed in time for the dramatic and spectacularly successful link between the Supreme Court chamber of the Capitol building and the railroad station in Baltimore.
Soon, as overhead wires connected cities up and down the Atlantic coast, the dots-and-dashes method that recorded messages on a long moving strip of paper was replaced by the operator's ability to interpret the code in real time (once the receiver was given two different types of "stop" pin that each made a different sound) and transcribe it into English letters as he heard it. Telegraph lines soon extended westward, and within Morse's own lifetime they connected the continents of Europe and America.