Abstract: The present invention is an electrical terminal unit adapted for supporting an electrical circuit element, for example, a moisture responsive resistor or the like and a sensing device employing this terminal unit. The terminal unit makes the influence of the reduction in insulation resistance between the terminals due to adhesion of pollutants to the terminal unit negligible by providing a grounded electrically conductive member or electrode member between the conductive terminal leads extending through a base or substrate of the terminal unit for electrically separating these terminal leads.

Abstract: A compact variable resistor adapted for use in balance adjusting circuits for stereo tape players or the like has an insulating substrate plate, lead conductor, insulating film and a resistance body. The lead conductor is connected to the resistance body through a central tap conductor provided at the central portion of the resistance body. The portions of the lead conductor other than the central conductor are insulated from the resistance body by the insulating film.

Abstract: A resistor comprises a ceramic plate on the opposite surfaces of which a thick film is arranged in a pattern forming respective electrically resistive circuits which are connected by continuing the film or coating over the edge of the substrate plate or by using a bonded metal clip to bridge the gap between the resistive circuits on the opposite surfaces.

Abstract: A controllable electric heating device uses a PTC resistance body having first areal electrode on one surface and two spaced apart areal electrodes of different areal size on the opposite surface in overlapping relation with a part of the first electrode to provide at least two current paths through the resistance body between the opposite surfaces. The first electrode is connected to one terminal of a voltage source. A switching device selectively connects one or more of the two spaced apart electrodes to the other terminal of the voltage source so that the effective electrode areas are altered thereby adjusting the current flow in the PTC body to produce different temperature levels of the heating device.

Abstract: An apparatus for the control of variable speed electrical positioning drives, especially for sewing machine positioning drives, is disclosed in two exemplary embodiments. The apparatus provides a preset nominal value of speed and a range of adjustment for additional signals in digital form, thus making possible a continuous or incremental change in the nominal value as well as additional digital signals. The apparatus includes lamellar contact elements of a potentiometer arranged on a base element in the path of a slider for the nominal value of speed and at least one low resistance lamellar contact element arranged in the slider path for producing an additional digital signal.

Abstract: Each pair of two pairs of terminals is connected by a conducting strip formed of a metallic material deposited on a fragile support block. The terminal connectors are shaped in an interwoven pattern, with an intervening space, such that the support block will not break along the space pattern. The connector strips are connected by a resistance material deposited along the space pattern and overlapping the adjoining strips. The four terminals are connected into a circuit arrangement so that the resistance material forms part of a vital resistor network which if interrupted causes that circuit arrangement to assume a safe condition. Any rupture of the resistance material and/or the support block due to thermal differences or mechanical force interrupts the continuity of one or both connector strips to create a safe failure condition.

Abstract: An electric resistance heating element, comprising at least two elongated dielectric bodies, each having a plurality of openings extending longitudinally thereon in radially displaced, parallel relation. Three metal pins fit into openings in the dielectric bodies and at least certain maintain the latter in longitudinally aligned relation. A resistance wire is wound on each of the bodies, each wire having longitudinally spaced terminals. One of the terminals of each resistance wire is electrically connected to one pin; the opposite terminal of one resistance wire is electrically connected to a second pin; and the opposite terminal of the other resistance wire is electrically connected to the third pin, whereby the one pin serves as a common electrical connection for both resistance wires, and the second and third pins serve as separate electrical connections to the respective resistance wires, whereby separate electrical circuits may be established within the heating element.

Abstract: An elongated electrical heating element comprises intertwisted helical strands of metal wire. Some of the strands extend the full length of the heating element and other strands extend predetermined shorter distances to provide two or more zones having differing electric resistances and therefore differing operating temperatures.

Abstract: The invention concerns a humidity or moisture sensor, with a relatively thick sensitive monolithic ceramic volume. The sensitive volume is defined by a porous ceramic material with multiple electrodes buried therein in parallel planes which extend substantially entirely across two dimensions of the structure. Moisture entering the porous crystalline matrix is subjected to a high electric field giving rise to a current which is a function of the ambient moisture. By virtue of the inert ceramic surface and the buried precious metal electrodes, the device is sensitive, fast, yet electrically, chemically, thermally and mechanically stable.

Abstract: A superconductive switch having a high operating rhythm. The superconductive material in a thin layer is cooled by a permeable fibre glass strip which brings the cryogenic fluid into contact with it. Application to the feeding of a device by successive discharges of a superconductive storage winding.

Abstract: Measuring cell for determining oxygen concentrations in a gas mixture, which cell comprises two elements made of a semiconductive oxidic material which is doped so as to have n-type and p-type conductivity respectively and which are separated by a metal layer, the electric resistance of the said semiconductive oxide depending upon the oxygen pressure. The cell is used for carburation control in an internal combustion engine.

Abstract: A precision electrical resistance network device comprising an electrically insulating substrate having at least two film electrical resistance elements supported thereon, the resistance elements having substantially the same temperature coefficient of resistance, characterized in that the device is constructed and arranged in such a way that temperature differences resulting through connection of the device in an electric circuit are minimized, which may be done by providing the substrate with heat transfer means through which heat can flow, so that a tendency for temperature differences in the film elements to occur is counteracted, and/or by twining and locating the resistance elements adjacent one another on the substrate, whereby the mean temperature of each element is substantially the same.

Abstract: An electrical resistance package comprises:A. an insulative substrate,B. a network in film form on the substrate, the network including resistance branches,C. there being terminals on the substrate and associated with the respective branches for registration with contact pins, whereby the resistance branch may be selectively electrically connected via said terminals with the pins in registration therewith.

Abstract: A four terminal varistor is shown as a device for providing fail-safe circuit protection under certain conditions. The failure of any lead connected to the four terminal varistor will shut down the protected load so that the load cannot operate under unsafe conditions. By its nature, a varistor can absorb voltage peaks and protect a load from high voltage and/or a current resulting from high voltage. One pair of leads from the varistor is connected to the power supply and the other pair of leads to the load. Thus, if any lead is broken, there will be no power to the load. A variation provides additional protection in the event the metal coating on the semiconductor, to which two of the leads are attached, becomes detached from the semiconductor. In case of such detachement, the electrical connection between the two leads is broken. For this purpose, the metalized coating on the semiconductor is divided into two separate areas, one for each lead.

Abstract: A printed resistor is proposed which has a laminated structure comprising a substrate and a foil current-carrying pattern attached to the substrate and provided with two current terminals and with at least one potential terminal. The current-carrying pattern is made as a network of series-parallel arms. A section of one of the parallel arms of the pattern is made of a material whose temperature coefficient of resistance exceeds that of the material of the rest of the current-carrying pattern. One side of said section is connected to one of the current terminals and the other, to one of the potential terminals. Proposed also is a method of manufacturing such printed resistors which consists in that, first, an area of the foil with a size sufficient for the temperature compensating element of the resistor to be accommodated thereon is coated with a metal layer whose temperature coefficient of resistance and the rate of solution in an etching substance are higher than those of the foil material.