Abstract: A composite glow discharge lamp having an elongated glass tube, in which an electrode assembly is located in said elongated glass tube at each of opposite ends thereof, the electrode assembly comprising a center electrode for emitting electrons and a glow electrode surrounding the center electrode, and the glow electrode being formed of an enclosure having an opening and a closed bottom and laid so that the opening faces the opposite end of the glass tube which is near thereto, and the closed bottom faces the longitudinally middle part of the glass tube, thereby it is possible to prevent blackening of the glass tube, and to prolong the use life of the composite discharge lamp.

Abstract: A discharge tube includes a pair of electrode devices mounted within a discharge tube body in an opposed relation to each other, each of the pair of electrode devices including an arc discharge electrode and a glow discharge electrode. An electron-radiating substance vaporized and emitted in a scattered manner from the arc discharge electrode is captured by the glow discharge electrode. The arc discharge electrode is composed of a sintered body containing the electron-radiating substance therein.

Abstract: A discharge tube having a pair of opposite electrode assemblies disposed in a discharge space defined by a peripheral wall and charged with gas, and an a.c. source connected at one end to one of the pair of electrode assemblies and at the other end to the other of the electrode assemblies, each of said opposite electrode assemblies comprising a sintered metallic electrode for emitting electrons and a filament electrode disposed closely adjacent to the sintered metallic electrode, for emitting thermoelectrons, and the sintered metallic electrode and the filament electrode being electrically connected in parallel by means of the associated lead wires.