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Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code ...
Alexander Graham Bell was a professor of elocution at Boston University and tutor of deaf children. He had begun electrical experiments in Scotland in 1867 and, after emigrating to Boston from Canada, pursued research into a method of telegraphy that could transmit multiple messages over a single wire simultaneously, a so-called "harmonic telegraph".
Alexander Graham Bell (/ ˈ ɡ r eɪ. ə m /; born Alexander Bell; March 3, 1847 – August 2, 1922) [4] was a Scottish-born [N 1] Canadian-American inventor, scientist, and engineer who is credited with patenting the first practical telephone. He also co-founded the American Telephone and Telegraph Company (AT&T) in 1885. [7]
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 January 2025. Technical and legal issues surrounding the development of the modern telephone For broader coverage of this topic, see History of the telephone. Replica of Antonio Meucci's telettrofono Reis's telephone The invention of the telephone was the culmination of work done by more than one ...
Alexander Graham Bell, about to call San Francisco from New York. A telephone call, which for marketing purposes is claimed to be the first transcontinental telephone call, occurred on January 25, 1915, a day timed to coincide with the Panama–Pacific International Exposition celebrations.
Watson in his later years, holding Bell's original telephone. Born in Salem, Massachusetts, [1] United States, Watson was a bookkeeper and a carpenter before he found a job more to his liking in the Charles Williams machine shop in Boston in 1872. [2] He was then hired by Alexander Graham Bell, who was then a professor at Boston University.
(Photo courtesy: IEEE) Parks Canada plaque at the Alexander Graham Bell National Historic Park, Baddeck, Nova Scotia, adjacent to the A.G. Bell Museum on the same site The Walk of Fame 'Bell Star' on Toronto's Simcoe Street Commemorative marker at 109 Court Street in Boston, where Bell and Watson transmitted their first harmonic 'twang' in 1875.
The first incarnation of the New England Telephone and Telegraph Company was a short-lived company set up to develop the then-new telephone.New England Telephone and Telegraph lasted only a year as a separate entity, from 1878 to 1879, and had no direct relationship with the later company of the same name, which after the breakup of the Bell System in 1984 became part of the NYNEX Corporation ...