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Telegraphy

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Telegraphy
DbpediaThing
Wikipedia articleDbpedia source
Telegraphy (from Greek: tele τῆλε "at a distance", and graphein γράφειν "to write") is the long distance transmission of textual/symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy whereas pigeon post is not.Telegraphy requires that the method used for encoding the message be known to both sender and receiver. Such methods are designed according to the limits of the signalling medium used. The use of smoke signals, beacons, reflected light signals, and flag semaphore signals are early examples. In the 19th century, the harnessing of electricity brought about the means to transmit signals via electrical telegraph. The advent of radio in the early 1900s brought about radiotelegraphy and other forms of wireless telegraphy. In the Internet age, telegraphic means developed greatly in sophistication and ease of use, with natural language interfaces that hide the underlying code, allowing such technologies as electronic mail and instant messaging.
Telegraphy
English Wikipedia http://en.wikipedia.org/wiki/Telegraphy
Spanish wikipedia http://es.wikipedia.org/wiki/Telegraf�a
Wiki page external link http://americanhistory.si.edu/archives/d8073.htm http://distantwriting.co.uk/ http://technikum29.de/en/communication/fax http://www.porthcurno.org.uk/ http://www.remuseum.org.uk/rem_his_special.htm http://www.telegrams.ca/ http://www.telegraph-office.com/pages/telegram.html http://eh.net/encyclopedia/article/nonnenmacher.industry.telegraphic.us http://books.google.com/?id=gtQWAAAAYAAJ&pg=PA197 http://books.google.com/?id=tnjfe4vEBGwC&pg=PA639 http://www.scribd.com/doc/123278691/International-Communications-Facilities-of-the-American-Carriers http://invention.smithsonian.org/resources/fa_wu_index.aspx

Conceptual map: Telegraphy

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Fecha publicación: 27.5.2015

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