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The phonograph becomes faster and more convenient due to an electric motor. The electric motor brings on the first juke box with cylinders – even before flat disk records were widely available. Thomas Edison discovers thermionic emission. This effect forms the basis for the vacuum tube and the cathode ray tube.
Electric Motor Chronology Selected Patents 1905, Alfred Zehden German, a feasible linear induction motor described in patent form for driving trains or lifts. U.S. patent 782,312: 1935, Hermann Kemper: German, built a working linear induction motor 1945–1949, Eric Laithwaite: British, first full-size working model of linear induction motor
The linear motor and its application to tracked hovercraft (1971) Linear electric motors (1971) Mills & Boon Monographs and Technical Library; Experiments with a linear induction motor (1971) Exciting electrical machines (1974) All things are possible: an engineer looks at research and development (1976) Transport without wheels ed. (1977)
Frank Dance's helical model of communication was initially published in his 1967 book Human Communication Theory. [161] [162] [163] It is intended as a response to and an improvement over linear and circular models by stressing the dynamic nature of communication and how it changes the participants. Dance sees the fault of linear models as ...
The electric motor exploits an important effect of electromagnetism: a current through a magnetic field experiences a force at right angles to both the field and current. This relationship between magnetic fields and currents is extremely important, for it led to Michael Faraday's invention of the electric motor in 1821.
Ferraris discussed the elementary theory of the apparatus, pointing out that the inductive action would be proportional to the slip, that is to say to the difference between the angular velocity of the magnetic field and that of the rotating cylinder, that the induced current in the rotating metal would also be proportional to this; and that ...
André-Marie Ampère (UK: / ˈ æ m p ɛər /, US: / ˈ æ m p ɪər /; [1] French: [ɑ̃dʁe maʁi ɑ̃pɛʁ]; 20 January 1775 – 10 June 1836) [2] was a French physicist and mathematician who was one of the founders of the science of classical electromagnetism, which he referred to as electrodynamics.
Joseph Henry (December 17, 1797 [1] [2] – May 13, 1878) was an American physicist and inventor who served as the first secretary of the Smithsonian Institution.He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smithsonian Institution. [3]