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Diagram of alphabet used in a 5-needle Cooke and Wheatstone Telegraph, indicating the letter G At first, Gauss and Weber used the telegraph to coordinate time, but soon they developed other signals and finally, their own alphabet.
A telegraph code is one of the character encodings used to transmit information by telegraphy. Morse code is the best-known such code.Telegraphy usually refers to the electrical telegraph, but telegraph systems using the optical telegraph were in use before that.
The Cooke and Wheatstone telegraph was an early electrical telegraph system dating from the 1830s invented by English inventor William Fothergill Cooke and English scientist Charles Wheatstone. It was a form of needle telegraph , and the first telegraph system to be put into commercial service.
The electric telegraph was slower to develop in France due to the established optical telegraph system, but an electrical telegraph was put into use with a code compatible with the Chappe optical telegraph. The Morse system was adopted as the international standard in 1865, using a modified Morse code developed in Germany in 1848. [1]
Nahin, Paul J., Oliver Heaviside: The Life, Work, and Times of an Electrical Genius of the Victorian Age, Johns Hopkins University Press, 2002 ISBN 978-0-8018-6909-9. Nickles, David Paull, How the Telegraph Changed Diplomacy, Harvard University Press, 2003 ISBN 0-674-01035-3.
A telegraph key, clacker, tapper or morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. [1] Keys are used in all forms of electrical telegraph systems, including landline (also called wire) telegraphy and radio (also called wireless) telegraphy .
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A single needle telegraph (1903) A needle telegraph is an electrical telegraph that uses indicating needles moved electromagnetically as its means of displaying messages. It is one of the two main types of electromagnetic telegraph, the other being the armature system, [1] as exemplified by the telegraph of Samuel Morse in the United States.