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Telegraphy

1:31

Invention of the Telegraph

5:32

Morse Telegraph Key | Development History

6:28

How to build a Telegraph

19:30

Telegraph History: "Telegram for America" 1951 Western Union; Telegraphy in the 1950s

10:52

Telegraph to Telephone - AT&T - A History from Early Invention to 1950's

Telegraphy is the long-distance transmission of textual or symbolic messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.
    • Terminology 

    • Early signalling 

    • Drum telegraph 

    • Optical telegraph 

    • Electrical telegraph 

    • Railway telegraphy 

    • Wigwag 

    • Heliograph 

    • Teleprinter 

    • Automated punched-tape transmission 

    • Oceanic telegraph cables 

    • Facsimile 

    • Wireless telegraphy 

    • Telegram services 

    • Telex 

    • Decline 

    • Social implications 

    • Popular culture