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SOS, the internationally
recognized distress signal,
does not stand for any particular
words. Instead, the letters were chosen because they are easy to transmit in Morse code: "S" is three dots,
and "O" is three dashes.

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Today the foundation of modern telecommunication means, constitutes a telegram.
Telegraph refers to the technology and the communications system.
A telegram is a message via telegraph.
A 'telegraph' is a device for transmitting and receiving messages over long distances.*

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http://sciencing.com/cons-telegraph-8246524.html
https://en.m.wikipedia.org/wiki/Electrical_telegraph
http://www.encyclopedia.com/science-and-technology/computers-and-electrical-engineering/electrical-engineering/telegraph
http://www.history.com/topics/inventions/telegraph

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Poor Quality Communication
Slow Speed
Message Length and Access

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FIRST MESSAGE WITH TELEGRAPH

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Developed in the 1830s and 1840s by Samuel Morse (1791-1872) and other inventors, the telegraph revolutionized long-distance communication.*

In 1844, Morse sent his first telegraph message, from Washington, D.C., to Baltimore, Maryland*

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The telegraph allowed a person to transmit a message over hundreds and, eventually, thousands of miles in the space of perhaps an hour.but it was normally calculated at twenty-five cents per hundred miles for ten words or less in the early 1850s.

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It worked by transmitting electrical signals over a wire laid between stations.  In addition to helping invent the telegraph, Samuel Morse developed a code (bearing his name) that assigned a set of dots and dashes to each letter of the English alphabet and allowed for the simple transmission of complex messages across telegraph lines. *

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Electric telegraphs, a transmitter, a receiver and ground occurs between the two power line.