21. The figure below displays commercial examples of thermionic emitters and electron guns produced at Heatwave Labs Inc. 22. Valve electrometers use a specialized vacuum tube ( thermionic valve ) with a very high plate ) circuit. 23. Thermionic emission can be used to measure the work function of both the hot emitter and cold collector.24. Example of an electron emitting a ) Thermionic Emitter and an electron accelerating b ) Electron Gun Assembly. 25. This " shadow " led to discovery of Thermionic emission, the basis for Vacuum tubes and electronics. 26. It was also called a thermionic valve, vacuum diode, kenotron, thermionic tube, or Fleming valve. 27. It was also called a thermionic valve, vacuum diode, kenotron, thermionic tube, or Fleming valve. 28. Cold cathode lamps are generally less efficient than thermionic emission lamps because the cathode fall voltage is much higher. 29. The thermionic cameras were made from brass, using round daguerreotype plates which exposed a diameter of 8 cm. 30. Plasma is produced via discharge from a barium-oxide coated cathode, which emits electrons via thermionic emission.
