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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
Introduction. Developed in the 1830s and 1840s by Samuel Morse (1791-1872) and other inventors, the telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid between stations.