Abstract: An electrodeless low-pressure discharge lamp having a sealed discharge vessel filled with a metal and a rare gas and having a cavity. An inductive device is disposed in the cavity for generating a high-frequency electric field inside the discharge vessel during lamp operation. The inductive device includes a winding of metal wire surrounding a cylindrical core of magnetizable material. A cooling body is in contact with the cylindrical core for removing heat generated in the core during lamp operation. The cooling body is closed in a gastight manner and includes a condenser, an evaporator, a liquid, and a capillary structure (T, U) which comprises a winding (U) of gauze surrounding a vapor channel (V) for transporting the liquid from the condenser to the evaporator. The capillary structure has a central partition wall (T), which divides the vapor channel in two, and is connected along two opposing longitudinal sides thereof to the gauze winding (U).

Abstract: A method of manufacturing a color display tube comprising an envelope having a display window and a color selection electrode and suspension means for suspending the color selection electrode, which four suspension means each contain a member which is fused into the envelope. In the method these members are heated by means of a laser. The members may be provided with bores on which the laser beam is incident, the surfaces of which may be blackened to increase heat absorption. The method is more energy efficient and less cumbersome than the prior method which relied upon coils to heat the members by induction of eddy currents.

Abstract: Electrodeless low-pressure discharge lamp having a discharge vessel which is sealed in a gastight manner and is filled with an ionisable metal vapor and a rare gas, which lamp has a cylindrical core of a magnetic material in which during lamp operation an electromagnetic field is generated in the discharge vessel by a metal wire winding surrounding the core and a high-frequency electric power supply unit connected thereto, the magnetic material core being provided with a cooling body consisting of a heat pipe which is located at the area of the longitudinal axis of the core and is surrounded by the core at least as far as the proximity of its first end, while the second end of the heat pipe is maintained at a relatively low temperature.

Abstract: There is provided a solar collector comprising a heat pipe having an evaporator section and a condenser section, together with an absorber plate thermally conductively connected to the evaporator section, one side of the absorber plate being provided with a layer for the selective absorption of incident solar heat. An evacuated transparent envelope encloses the absorber plate and the evaporator section. A part of the evaporator section is free of the absorber plate and is provided with a separate layer for the selective absorption of incident solar heat, such separate layer having the same heat absorption coefficient as but a higher heat emission coefficient than the layer on the absorber plate per unit of length of the evaporator section.

Abstract: There is provided a solar collector comprising a metal heat pipe having an evaporator section and a condenser section. A metal tube is spaced from and surrounds the evaporator section, one end of such metal tube being closed and the other end being open. A metal solar heat absorber plate is thermally conductively connected to the metal tube. An evacuated transparent glass envelope is spaced from and surrounds the metal tube and the absorber plate connected thereto, such envelope being joined to the open end of the metal tube by means of a glass-metal seal. A thermally conductive medium fills the space between the metal tube and the evaporator section of the heat pipe.