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Non-electric telegraph was invented by Claude Chappe
1794~ Non-electric telegraph was invented by Claude Chappe,This system was visual and used semaphore, a flag-based alphabet, and depended on a line of sight for communication. -
Period: to
Communication through telegraphs
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A crude telegraph was invented by Samuel Soemmering
1809~ A crude telegraph was invented by Samuel Soemmering,
He used 35 wires with gold electrodes in water and at the receiving end 2000 feet the message was read by the amount of gas caused by electrolysis. -
First telegraph
1828~ First telegraph in the U.S.A by Harrison Dyar, who sent electrical sparks through chemically treated paper tape to burn dots and dashes.
proved that signals could be transmitted by wire. -
Samuel Murse created the “Morse Code”
1835~ Samuel Murse created the “Morse Code” , He used pulses of current to deflect an electromagnet, which moved a marker to produce written codes on a strip of paper -
News about telegraphs
1851~ The telegraph spreads , Small telegraph companies, meanwhile began functioning in the East, South, and Midwest. -
Western Union
1861~Western union is the first transcontinental telegraph line in 1861 mainly along “Railroad of way.” -
long-distance communication
Until 1877, all rapid long-distance communication depended upon the telegraph -
Arguemment of two companys
By 1879, patent litigation between Western Union and the infant telephone system was ended in an agreement that largely separated the two services. -
Western Union developed multiplexing
In 1913 Western Union developed multiplexing, which it made possible to transmit eight messages simultaneously over a single wire (four in each direction). -
Automatic transmission
Automatic transmission, introduced in 1914, handled more than twice that number. Canadian, Fredrick Creed invented a way to convert Morse code to text in 1900 called the Creed Telegraph System.
