Cathodes having mercury or liquid alkali metal deposited on the cathode surface during operation of the tube

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 > Cathodes having mercury or liquid alkali metal deposited on the cathode surface during operation of the tube