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A telegraph is a device for transmitting and receiving messages over long distances, i.e., for telegraphy. The word telegraph alone generally refers to an electrical telegraph. Wireless telegraphy is transmission of messages over radio with telegraphic codes.

Apr 14, 2025 · telegraph, any device or system that allows the transmission of information by coded signal over distance.

Nov 9, 2009 · Developed in the 1830s and 1840s by Samuel Morse and other inventors, the telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid...

The timeline of North American telegraphy is a chronology of notable events in the history of the electric telegraphy in the United States and Canada, including the rapid spread of telegraphic communications starting from 1844 and completion of the …

Telegraphy facilitated faster and more profitable freight and passenger railway traffic, consolidated financial and commodity markets, sped political news and commentary, and lowered information costs for companies.

Apr 14, 2025 · A variant that ultimately became known as the International Morse Code was adopted in 1851 for use on cables, for land telegraph lines except in North America, and later for wireless telegraphy. Except for some minor improvements in 1938, the International Morse Code has remained unchanged.

With telegraphy (from the Greek words tele (τηλε) = far and graphein (γραφειν) = write), messages are sent over long distances without any need to physically transport letters. To send messages, a telegraph sends pulses of electricity through wires in a special code .

This section is broken into four parts, each reviewing an era of telegraphy: precursors to the electric telegraph, early industrial organization of the industry, Western Union’s dominance, and the decline of the industry.

The meaning of TELEGRAPHY is the use or operation of a telegraph apparatus or system for communication.

Telegraphy is a form of long-distance communication that uses a device known as a telegraph to transmit electrical signals over wires. The telegraph sends a series of pulses and taps electronically over the length of a wire to another device.