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Many electrical telegraph systems were invented that operated in different ways, but the ones that became widespread fit into two broad categories. First are the needle telegraphs, in which electric current sent down the telegraph line produces electromagnetic force to move a needle-shaped pointer into position over a printed list.
According to Morse, telegraph dates only from 1832 when Pavel Schilling invented one of the earliest electrical telegraphs. [3] A telegraph message sent by an electrical telegraph operator or telegrapher using Morse code (or a printing telegraph operator using plain text) was known as a telegram.
Earth-return telegraph is the system whereby the return path for the electric current of a telegraph circuit is provided by connection to the earth through an earth electrode. Using earth return saves a great deal of money on installation costs since it halves the amount of wire that is required, with a corresponding saving on the labour ...
Sir Charles Wheatstone (/ ˈ w iː t s t ə n /; [1] 6 February 1802 – 19 October 1875) was an English physicist and inventor best known for his contributions to the development of the Wheatstone bridge, originally invented by Samuel Hunter Christie, which is used to measure an unknown electrical resistance, and as a major figure in the development of telegraphy.
Georges-Louis Le Sage (French: [lə saʒ]; 13 June 1724 – 9 November 1803) was a Genevan physicist and is most known for his theory of gravitation, for his invention of an electric telegraph and his anticipation of the kinetic theory of gases. He was a contributor to Diderot's Encyclopédie. [1]
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.
He invented a precursor to the electric doorbell (specifically a bell that could be rung at a distance via an electric wire, 1831) [7] and electric relay (1835). [8] His work on the electromagnetic relay was the basis of the practical electrical telegraph , invented separately by Samuel F. B. Morse and Sir Charles Wheatstone .
The Electric Telegraph: An Historical Anthology (1977) Smethers, J. Steven. "Pounding Brass for the Associated Press: Delivering News by Telegraph in a Pre-Teletype Era." American Journalism 19.2 (2002): 13-30. Sussman, Gerald. "Nineteenth-century telegraphy: Wiring the emerging urban corporate economy." Media History 22.1 (2016): 40–66.