Telegraphy n. : The science or art of constructing, or of communicating by means of, telegraphs; as, submarine telegraphy.

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Taxonomy
Telex, Western Union, telegram, telegraph, TWX, Wireless telegraphy, service, Internet, Telex service, Telex network, electrical telegraph, the Bell, wire, invention, London, company, Telex machine, Morse code.

Defination from the web:
Telegraphy is the long-distance transmission of written messages without physical transport of letters. ... Radiotelegraphy or wireless telegraphy transmits messages using radio. ... Wireless telegraphy is also known as "CW", for continuous wave (a carrier modulated by on-off keying) ...