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alkali metals amperes atom bath temperature bridge bulb Caesium candle cathode constant current flows curves device distance elec electric electrons emitted emission energy equation ergs escape experimental fila filament fraction free electrons frequency galvanometer suspension glass gradient grid bias heating current hot cathode hydrogen illumination increased instrument insulated ionization jaws leak resistance lens less light beam light sensitive cells maximum megohm mercury metal meter milliameter mils needle negative number of electrons ohms operate oxides photo-electric cell photo-electric current photo-electric effect plate current plate voltage platinum positive potential positively charged potential difference potentiometer pressure quantum radiation radio RADIOTRON resis resistance thermometer reversed potential Roebuck selenium cell shown in Fig shunted shutter space current stop sufficient surface tance tests thermionic valve thermometer thermostat tion trons unit volume vacuum tube variation varied velocity visible spectrum Visitron voltmeter volts wave length wiring layout zero