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Thomas Edison observes Thermionic emission.
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Thomas Edison
American inventor and businessman (1847–1931)
Thomas Alva Edison was an American inventor and businessman. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventions, which include the phonograph, the motion picture camera, and early…Source: Wikipedia (CC BY-SA)
Thermionic emission
Thermally induced flow of charge carriers from a surface
Thermionic emission is the liberation of charged particles from a hot electrode whose thermal energy gives some particles enough kinetic energy to escape the material's surface. The particles, sometimes called thermions in early literature, are now known to be ions or electrons.…Source: Wikipedia (CC BY-SA)