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

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Gas-filled discharge tubes with solid cathode (H01J25/00, H01J27/00, H01J31/00 - H01J41/00 take precedence; gas filled spark gaps H01T; Marx converters H02M7/26) > Details > Electrodes; Screens > Cathodes > having mercury or liquid alkali metal deposited on the cathode surface during operation of the tube