Abstract: A high-precision foamed coaxial cable includes an internal conductor constructed by stranding conductors, an insulator constructed by winding a porous tape around an outer circumference of the internal conductor, and an external conductor constructed by braiding a plurality of thin conductor wires around an outer circumference of the insulator. The insulator is formed to have a right circle external shape, an outside diameter of the insulator is formed smaller at a reduction rate of 3 to 5% than the outside diameter, immediately after the winding, of the insulator. The external conductor is formed to have a right circle external shape, an outside diameter of the external conductor is formed smaller at a reduction rate of 2 to 4% than the outside diameter, immediately after the braiding, of the external conductor, and precision of its characteristic impedance is set at ±1 ?.

Abstract: A high-precision foamed coaxial cable includes an internal conductor constructed by stranding conductors, an insulator constructed by winding a porous tape around an outer circumference of the internal conductor, and an external conductor constructed by braiding a plurality of thin conductor wires around an outer circumference of the insulator. The insulator is formed to have a right circle external shape, an outside diameter of the insulator is formed smaller at a reduction rate of 3 to 5% than the outside diameter, immediately after the winding, of the insulator. The external conductor is formed to have a right circle external shape, an outside diameter of the external conductor is formed smaller at a reduction rate of 2 to 4% than the outside diameter, immediately after the braiding, of the external conductor, and precision of its characteristic impedance is set at ±1 ?.

Abstract: The high-voltage circuit breaker with gas insulation is equipped with a device for gas-blast and blowout of the arc generated between the stationary arcing contact and the movable arcing contact when the current is interrupted. Downstream from the blowout nozzle there is located a cooling tube provided with several holes for flow of the gas placed on the outlet path of the hot gas generated by the arc. When the hot gas flows in the cooling tube, the gas pressure difference at the level of the outlet holes causes cool gas to be sucked into the tube and gives rise to a mixture of the hot and cold gases. The gas outlet to the outside of the cooling tube is sufficiently cooled to ensure the dielectric characteristics of the circuit breaker.

Abstract: A resistor module which is small in size and easy to probe for measuring and in which a plurality of resistors are formed on the surface of an insulated substrate, an insulating layer is provided to extend over the resistors and conductor patterns for connection of the resistors, and a conductor bar to be connected with a power source pattern or grounding pattern of a printed circuit board is mounted on the insulating layer.

Abstract: A tension control device, particularly for an apparatus recording and/or reproducing video signals on a tape which is wound on and extends between supply and take-up reels, includes a pivoted tension control arm urged by a tensioning spring against a run of the tape between the reels for detecting the tape tension and correspondingly controlling a brake resisting rotation of the supply reel so as to maintain the tape tension at a level determined by the spring force, and the spring force is made adjustable for varying the tape tension which is to be maintained by connecting the tensioning spring to a movable anchor member which is substantially counter-balanced, for example, by another spring acting on the anchor member in opposition to the tensioning spring.