Positioning or moving the cathode spot on the surface of a liquid-pool cathode

Full Title

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps (details of electron-optical or ion-optical arrangements H01J3/00) > Main electrodes > Liquid electrodes, e.g. liquid cathode > Positioning or moving the cathode spot on the surface of a liquid-pool cathode