Refractory-oxide-based elongated incandescent radiator has a body portion which principally comprises refractory oxide with from about 8 volume percent to 20 volume percent of refractory metal dispersed therein. Such members are normally not sufficiently conducting to enable them to be self-resistance heated to a condition of incandescence. The room-temperature conductivity of such a member is greatly increased by heating the initially sintered member during fabrication thereof to a temperature ...

A dipole array antenna includes a conducting substrate, a feeder layer, and a dipole layer. The feeder layer is spirally formed by etching a first thin film on the foamed dielectric layer. The feeder layer is placed on a conducting substrate and a connector is attached to the feeder layer. The dipole layer is placed on a second foamed dielectric layer deposited on the feeder layer so as to prevent the energy loss of the feeder layer by etching a second thin film.

Nondestructive testing of heat exchangers (12), such as a radiator, measures the percentage of good bonds between air centers and cooling tubes based on natural or resonant frequencies of the exchanger (12). The exchanger (12) is excited by an audio speaker (38) and measured for a first natural frequency in the center thereof by an accelerometer (44). The natural frequency is indicative of the percentage of good bonds in the center portion of the exchanger (12) based on the stiffness thereof. Th...

A plurality of radiating elements fabricated of flexible thin steel is secured to a telescoping mast. A ground plane is formed of a plurality of similar steel members which are mounted in a plane perpendicular to the mast. Within the mast are cables and auxiliary electrical equipment. The radiating elements, the ground plane elements, and the mast are completely collapsible into a compact package.

Alkylene glycol-based coolants free of nitrites, amines, and phosphates are metal corrosion inhibited with at least one nucleus-substituted benzoic acid and at least one conventional corrosion inhibitor for metals.

A fluid flow assembly for solar heat absorbers, radiators and the like formed of a pair of tubular headers, defining respectively an inlet header and an outlet header, and placed in fluid flow communication by a plurality of tubular members disposed substantially coplanar and parallel, and connected at each end to one of the headers. The end portions of the tubular members project into the headers through a collective slot disposed in the sidewall of each header. The lengths of the tubular membe...

A radiator for motor vehicles is provided which has several tubes opening to respective upper and lower radiator tanks and arranged parallel to one another for the guidance of heat exchange fluid. Heat exchange fins are disposed perpendicularly to the tubes and are fixedly connected thereto. The fins exhibit respective cut-out openings forming a groove at at least one of the surfaces of the fin blocks, which groove expands toward the inside and serves for connecting lateral parts, which lateral ...

One or more radiating elements are coupled to a source of microwave energy by one or more quarter-wave lines of alternately high and low characteristic impedance.

A support assembly for radiators and air conditioning condensors for motor vehicles which includes a support frame having a central opening and a center brace of roughly crank shaped cross section provided in the center of the frame and vertically cutting across the opening therein. The crank shaped cross section is formed by two parallel attachment faces which project laterally with respect to the opening in opposite directions and a member connecting the two faces. The two attachment faces are...

Contact pins are mechanically fixed to hollow cylindrical insulation sleeves surrounding the contact pins at both ends of an infrared bright radiator by way of a circumferential recess within the inner wall of the hollow cylindrical sleeve or the opposed surface of the contact pin which receives a radial projection carried by the other of the two members to limit axial movement of the pin relative to the insulation sleeve.