FIELD: electric signalling devices. SUBSTANCE: hollow cathode is fabricated in the form of ring from conductive material coated with thermal emission material. Anode is manufactured in the form of conductor placed inside electric insulation tube protruding from its open end. Length of protruding part amounts to 8-10% of total length of tube. EFFECT: expanded application field, facilitated manufacture. 1 dwg
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Authors
Dates
1995-02-09—Published
1990-03-02—Filed