A cathode ray tube is a device for producing electronic images by directing a beam of electrons on a screen coated with some fluorescent material. The beam of electron is produced by a cathode. The direction of this beam can be manipulated by suitable means. This enables the beam of electron to strike different pars of the fluorescent screen in a desired sequence and lighting up that part of the screen. In this way different pictures are produced by the CRT. These are used in many different equipments such as TV screens, computer monitors, and oscilloscopes.
A hot CRT is a type of CRT which uses a cathode that is intentionally heated to produce the electron beam. The first CRT with hot cathode were developed independently by John B Johnson and Harry Weiner Weinhart. It became a commercial product in 1922.
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