Example image of eyePlorer eyePlorer map for 'Thermionic emission': Charge carrier Electron Archaism Cathode Vacuum tube Solid-state physics Thermionic converter J. J. Thomson 1873 Frederick Guthrie Eugen Goldstein Johann Wilhelm Hittorf 1880 Incandescent light bulb Thomas Edison Galvanometer William Henry Preece John Ambrose Fleming Diode Heat engine Owen Willans Richardson Nobel Prize in Physics Work function Electron volt Arrhenius equation Boltzmann constant Current density Kelvin Planck constant Electron gun Field electron emission Rydberg matter Thermotunnel cooling Vacuum arc Dynatron Field emission gun Hot cathode List of effects Fleming valve Free electron model Electron ionization Grid leak Lester Germer Nixie tube RF antenna ion source Australian Synchrotron Cathode heater Sandra Magnus Scientific phenomena named after people Space charge