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Telegraph Sounder. A telegraph sounder is an antique electromechanical device used as a receiver on electrical telegraph lines during the 19th century. It was invented by Alfred Vail after 1850 to replace the previous receiving device, the cumbersome Morse register [1] and was the first practical application of the electromagnet.
In 1878, Jesse created his own company, J. H. Bunnell and Co. Jesse constantly developed telegraphic instruments. In 1868 he received a patent for telegraph repeater, [4] printing telegraph, [5] created different telegraph sounders [6] and improved telegraph switchboard. [2] [7] He is famous for his steel lever key, which was patented on 15 ...
telegraph key, recording telegraph, ‘dot-and-dash’ telegraph alphabet Alfred Lewis Vail (September 25, 1807 – January 18, 1859) was an American machinist and inventor. Along with Samuel Morse , Vail was central in developing and commercializing American electrical telegraphy between 1837 and 1844.
Cooke and Wheatstone's five-needle telegraph from 1837 Morse telegraph Hughes telegraph, an early (1855) teleprinter built by Siemens and Halske. Electrical telegraphy is a point-to-point text messaging system, primarily used from the 1840s until the late 20th century.
In some applications, a pair of headphones replaced the telegraph sounder, being much more sensitive to weak signals, or a Morse recorder which recorded the dots and dashes of the signal on paper tape. A coherer with electromagnet-operated "tapper" (decoherer), built by early radio researcher Emile Guarini around 1904.
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It is the site of the first public demonstration of the Morse electromagnetic telegraph on January 11, 1838. Although Morse and Alfred Vail had conducted most of the research and development in the ironworks facilities, they chose the factory house for demonstration. Without the repeater, the range of the telegraph was limited to two miles (3 ...
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