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Key, Telegraph


Nom de l'objet : Key, Telegraph
Catégorie de l'objet : Telecommunication device
Matériaux : Metal
Numéro d'accession : 1996.30.11
Date de début de production : 1932-01-01
Date de fin de production : 1996-12-31
Description : Key, Morse Type D, Ref. No. 10F/7373 AM.
Commentaires : This telegraph key is a Morse type D with a reference number of 10F/7373 AM. A telegraph key, also known as a Morse key, is a generic term for any switching device used primarily to send Morse code. There are multiple types of keys from the most familiar straight key type to sideswiper type. Morse code was invented by an American named Samuel Finley Breese Morse (1791-1872). Before the invention of the telegraph, most long-distance messages were carried by messengers who memorised them or carried them in writing. In 1830, Joseph Henry (1797-1878) made the first long-distance telegraphic device. Morse invented a telegraph system which was the first device for sending messages using electricity. Messages sent by tapping out a code for each letter in the form of long and short signals dash/dashes and dits/dots. The code was converted into electrical impulses and sent over telegraph wires. A telegraph receiver at the other end of the wire converted the impulses back into dots and dashes and decoded the messages. In 1844, Morse demonstrated the telegraph and his code to the United States Congress and in 1851, a conference in Berlin established the international version of the Morse code. With his code, Morse aimed for efficiency and speed by keeping it as short as possible. This meant that the commonest letters were assigned the shortest code. That is why there appears to be no obvious relationship between alphabetical order and the symbols used.
Établissement : Atlantic Canada Aviation Museum
Ville de l'établissement : Enfield
Province de l'établissement : Nova Scotia
Site web de l'établissement : http://www.acam.ednet.ns.ca   Facebook-Atlantic Canada Aviation Museum 

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