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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] [additional ...
Alexander Graham Bell. Bell's March 10, 1876, laboratory notebook entry describing his first successful experiment with the telephone. Alexander Graham Bell had pioneered a system called visible speech, developed by his father, to teach deaf children. In 1872 Bell founded a school in Boston, Massachusetts, to train teachers of the deaf.
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...
A diagram from one of Bell's 1880 papers. The photophone is a telecommunications device that allows transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his assistant Charles Sumner Tainter on February 19, 1880, at Bell's laboratory at 1325 L Street in Washington, D.C. [1][2] Both were later to become ...
t. e. A Bell test, also known as Bell inequality test or Bell experiment, is a real-world physics experiment designed to test the theory of quantum mechanics in relation to Albert Einstein 's concept of local realism. Named for John Stewart Bell, the experiments test whether or not the real world satisfies local realism, which requires the ...
Bell's theorem. Bell's theorem is a term encompassing a number of closely related results in physics, all of which determine that quantum mechanics is incompatible with local hidden-variable theories, given some basic assumptions about the nature of measurement. "Local" here refers to the principle of locality, the idea that a particle can only ...
The Volta Laboratory which Bell used from 1885 to 1922 Side of the Volta Bureau in 2022. From about 1879 Bell's earliest physics research in Washington, D.C., was conducted at his first laboratory, a rented house, at 1325 L Street NW, [8] and then from the autumn of 1880 at 1221 Connecticut Avenue NW.
Bell's 1893 Volta Bureau building in Georgetown, Washington, D.C.. In 1880, when the French government awarded Alexander Graham Bell the Volta Prize of 50,000 francs for the invention of the telephone (equivalent to about US$10,000 at the time, or about $330,000 now), [2] he used the award to fund the Volta Laboratory (also known as the "Alexander Graham Bell Laboratory") in Washington, D.C ...