Abstract: This invention relates to a method of and an apparatus for baking the silicate films, which are formed on the front glass panels of cathode-ray tubes by a spraying or coating operation, so as to fix the films stably to the front glass panels. The front glass panels only, which are positioned in opposition to infrared ray radiation panels provided in the upper portion of a heating furnace body, are heated with the radiant heat from the infrared ray radiation panels. The radiant heat-screening isolation plates are provided between the front glass panels and funnels, and at least a part, which is below these isolation plates, of the furnace body is opened or cooled.

Abstract: A corrugated elliptical waveguide medium comprises a corrugated hybrid mode excitation member having an elliptical transverse cross-section for propagating electromagnetic energy therethrough. The excitation member is provided with longitudinally spaced apart parallel corrugations with the teeth of the corrugations defining an inner ellipse and the grooves of the corrugations defining an outer ellipse. The depths of the corrugation grooves on the major and minor axes of the ellipsis are dimensioned such that the tangential electric and magnetic field components of the energy in a circumferential direction are zero on the inner ellipse.

Abstract: An electrical conductor device is connected between an anode voltage supply terminal on the funnel and an electron gun assembly in the neck in parallel with a conductive inner graphite film for electrical connection of the terminal and the assembly. The conductive inner graphite film has a high-resistance portion and a low-resistance portion, and the electrical conductor device has a smaller resistance than that of the high-resistance portion. Upon spot knocking, high voltage is selectively supplied to the electron gun assembly through the electrical conductor device and in operation, through the conductive inner graphite film.

Abstract: In a method of fabricating a cathode-ray tube, an evacuated and sealed bulb provided with a phosphor screen and an electron gun including a cathode is subjected to a process of flashing a getter attached to the inner wall of the bulb. Thereafter, the bulb is subjected to a scanning process of causing the electron gun to emit an electron beam therefrom while deflecting the electron beam. The scanning process is followed by an aging process for the cathode of the electron gun.

Abstract: In an exhaust gas recirculation system for an internal combustion engine of the back pressure control type which provides, by a vacuum-operated control valve, a pressure chamber of substantially constant and nearly atmospheric pressure at a middle portion of an exhaust gas recirculation passage, a thermostatic control means is incorporated in a vacuum passage which supplies control vacuum to the vacuum-operated control valve so as to modify the vacuum conducted therethrough in accordance with the temperature of the engine so that a partial ratio of exhaust gas recirculation is effected in cold operation of the engine.

Abstract: An exhaust gas recirculation system for an internal combustion engine, having an exhaust gas recirculation control valve of the diaphragm type which controls the opening of an exhaust gas recirculation passage and is actuated by intake vacuum of the engine modified by a vacuum control valve which in turn is actuated by the pressure of exhaust gases in the exhaust gas recirculation passage controlled by the exhaust gas recirculation control valve, the system further including a relief valve which opens a diaphragm chamber of the exhaust gas recirculation control valve to the atmosphere when the engine is decelerated so that the exhaust gas recirculation control valve immediately closes the exhaust gas recirculation passage when the engine is decelerated.

Abstract: An exhaust gas recirculation system for an internal combustion engine of the back pressure control type wherein a back pressure chamber formed in a recirculation passage for recirculating exhaust gases is controlled to be substantially at atmospheric pressure by co-operation of a vacuum-operated diaphragm type exhaust gas recirculation control valve and a vacuum control valve which modifies the vacuum supplied to the exhaust gas recirculation control valve, wherein the system further includes a vacuum switching valve which selectively supplies intake manifold vacuum to a second diaphragm chamber of the exhaust gas recirculation control valve so as to close the control valve temporarily when the engine is decelerated.