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Definition of telegraph - a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electri Definition of telegraph - a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electri
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. Telegraphy requires that the method used for encoding the message be known to both sender and receiver. Many 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 example