Abstract: The present invention is directed to an electrode structure which is most applicable for plasticating barrels having wound, wire resistance heaters. Electrode structure includes at least one lower electrode plate and an upper electrode plate. A closely wound electrode band connected to the wound wire resistance heater is formed over the lower electrode plate to assure maximum electrical, and thus, thermal transfer. An upper ceramic layer is formed over the electrode band and wound wire resistance heaters. This upper ceramic layer can be ground down to accommodate the addition of an external plate on top of the upper electrode plate.

Abstract: A resistive structure has an improved electric field profile deposited on the surface of a cylindrical insulating substrate. At least one resistive path or trace is provided with a helix-looking shape and is directly printed on the surface of the insulating substrate. A resistive voltage divider includes first and second resistors electrically connected in series, where each resistor is made of one or more traces of electrically resistive film material applied onto a cylindrical insulating substrate. At least one of the traces is shaped like a helix and is applied onto the substrate by direct printing.

Abstract: An axial resistance sheathed heater is presented. The axial resistance sheathed heater includes a retaining sheath having a first end and a second end and a resistance wire completely disposed within the retaining sheath. The heater further includes a first conductor rod partially disposed within the retaining sheath and extending beyond the first end of the retaining sheath, the first conductor rod in direct electrical communication and direct mechanical communication with the resistance wire; and a second conductor rod partially disposed within said retaining sheath and extending beyond the second end of the retaining sheath, the second conductor rod in direct electrical communication and direct mechanical communication with the resistance wire. The resistance wire, the first conductor rod and the second conductor rod comprise a circuit achieving a power to voltage rating of about 5000:24.

Abstract: A potentiometer network includes a first main terminal, a second main terminal, a plurality of resistive elements connected in parallel between the first main terminal and the second main terminal, and means for embedding calibration of said resistive elements in said potentiometer network.

Abstract: A high-voltage resistor element which is superior to heat resistance, dielectric breakdown strength, vibration resistance and durability performance, and is advantageous to maintenance, inspection, adjustment, replacement and repair, is made up of: a cylindrical outer tube made of metal; a resistive heat-generating wire in a coiled shape tensionally extending between inner ends of electrode rods inserted respectively from both ends of the outer tube; an insulating material filing up a space between the resistive heat-generating wire with the electrode rods and the internal surface of the outer tube and fired; and insulating sleeves extractably encasing and anchored in the portions adjacent to the both ends of the outer tube penetratingly bridging between arrangement boards.

Abstract: A heater for heating a rigid fluid line or hose for freeze protection. The heater has a base made of an outer base layer, a middle base layer attached to the outer base layer; and an inner base layer attached to the middle base layer. The inner base layer can be uncured silicone (before assembly processing). A resistance wire is wound around an electrically non-conductive core and located on the inner base layer. The resistance wire can be a high gauge wire providing for a small moment of flexure. A cover includes an inner cover layer covering said resistance wire. This inner cover layer can be uncured silicone (before assembly processing). A middle cover layer is attached to the inner cover layer, and an outer cover layer is attached to the inner cover layer. The outer cover layer protects the heater from abrasion.

Abstract: Provided is an electronic material composition which is capable of forming a cured film exhibiting a desired glass transition temperature, a desired stiffness modulus in a rubbery state and a desired extensibility at low temperatures. Also provided is an electronic component comprising a molded body, a packed body, a covering body, an electrode or a joining body, all being formed of the aforementioned electronic material composition. Also provided is a method of using the aforementioned electronic material composition, which is featured in that the electronic material composition is applied in a semi-cured state, and after the application thereof, completely cured.

Abstract: A heater/sensor with an electric heating coil has an insulating pipe with a bore therein has nonheating wire threaded therethrough. The nonheating wire is attached to a first end of a heating wire which is wound about the periphery of the insulating pipe. A second end of the heating wire is attached to a second nonheating wire. A first ceramic coating of a binder and a coarse grade alumina is formed on the pipe and wires through a dip process. A second ceramic coating of a binder and a fine alumina coating is formed on the first ceramic coating though a second dip process. The twice coated heater/sensor complex is secured in a soldering iron tip.

Abstract: A resistor element for determining a parameter, including a ceramic support, an electrically resistive body formed on the ceramic support, at least one lead wire electrically connected to the electrically resistive body, and an adhesive containing platinum for securing the lead wire(s) to the ceramic support. Each lead wire includes a wire rod having a lower thermal conductivity than platinum, and a covering layer which covers the wire rod and is formed of an alloy including platinum as a major component.

Abstract: A resistor element including a cylindrical ceramic support having two openings open on longitudinally opposite end faces thereof, an electrically resistive layer formed on an outer circumferential surface, a pair of electrical conductors for connecting the electrically resistive layer to an external circuit, each of which has an end portion inserted into a corresponding one of the openings of the ceramic support, and an electrically conductive adhesive filling each opening of the ceramic support, for securing the end portion of the corresponding conductor to the ceramic support. The electrically resistive layer has two integrally formed extensions for covering the opposite end faces of the ceramic support, respectively, and respective inner wall surfaces of the openings of the ceramic support. The conductors are electrically connected to the extensions of the resistive layer by the electrically conductive adhesive filling each opening of the ceramic support.

Abstract: A winding (12) is wound around a core (10) having a circular cross-section. The wound core (10) is then deformed by pressure between flat surfaces (14, 16) until a flat contact surface is created which allows the use of sliding brushes, for example.

Abstract: An electrical heating element module particularly useful for heating the teeth of a hair comb or pick includes a pair of parallel, side-by-side spaced elongated central conductors having wound thereon a fibrous inorganic electrical insulation material, such as glass yarn, with the opposite ends of each central conductor exposed. An electrical resistance heater wire is wound over the glass insulation yarn on one central conductor and then over the yarn of the other central conductor and making contact with a corresponding end of each central conductor thereby providing effectively one electrical resistance heater. The central conductors are vertically supported by a flat insulator having a pair of sockets provided with spring contacts for establishing electrical connection to the remaining exposed ends of the central conductors.

Abstract: A resistance heater for performing heat treatment of the braze-affected area of a metallic sleeve attached by brazing within and to a metallic tube, comprises a metal tube (10) of which a portion (16) is formed with a spiral groove (11) which penetrates the wall thickness of the tube (10) and thereby defines a heating coil. The radial thickness of the convolutions of the coil varies lengthwise of the coil so that, when energized with electrical current, the coil develops a temperature profile which is determined by the variation in radial thickness. The temperature profile may be selected according to the needs of the brazed joint to be heat treated.

Abstract: An improved heater assembly and method for applying a brazing heat across a selected longitudinal section of a tube is disclosed herein. The heater assembly generally comprises a heater mandrel having an electrical resistance heating element coiled thereabout, and a support mandrel for supporting and centering this heating element. The heater mandrel further includes a means for directing a flow of inert gas in the space between the coiled heating element and the inner walls of the tube being brazed in order to purge this space of ambient atmospheric oxygen and prevent the heater mandrel from oxidizing. The support mandrel includes a centering means in the form of two roller assemblies, each of which has three spring-loaded rollers equidistantly spaced 120.degree. around its diameter. In the method of the invention, the heater mandrel is inserted into the tube and slid across the longitudinal section to be brazed.

Abstract: A resistance element causing less sliding noise for use in wound-type variable resistors and a method of making the same are disclosed. A resistance element obtained by winding a metallic resistance wire on a core is subjected to etching treatment. With this etching treatment, the metallic oxides, chlorides and sulfides considered acting as insulators, and organic molecules, adsorbed gases and other contamination forming the surface layer of the resistance wire are dissolved and removed. Furthermore, by immersing the etched resistance element in an ammonia solution, etc., the copper precipitated on the surface of the resistance wire is dissolved.

Abstract: Both an apparatus and a process for accurately applying a correct amount of brazing heat to a conduit are disclosed herein. The apparatus generally comprises a mandrel including an electrical resistance wire heating element and a heat sensor for sensing the temperature of the inside walls of the conduit which were heated. The mandrel is preferably formed from a refractory material, and the heat sensor is located beneath the surface of the mandrel in order to insulate it from heat radiated from the electrical resistance wire wound about the mandrel body. The mandrel further includes an opening in the portion of the mandrel which surrounds the heat sensor in order that the sensor may be selectively exposed to a section of conduit to which heat was applied by sliding the mandrel to a position which aligns the opening with the wall of the heated conduit. The temperature of the conduit may then be determined as a function of the radiant heat received by the heat sensor.

Abstract: An electronic stringed instrument which uses electrical resistance wires as strings to control the frequency of electrically generated sounds. By shorting a string at various points along its length a variable voltage output is obtained and converted into a known frequency. A fretted instrument provides a means to incrementally control the voltage output and a non-fretted type instrument with a conducting fingerboard can provide a means to variably control the voltage output. A separate current source may be provided for each string to faciliate chord playing and a control for the intensity and harmonic content of the signals is provided. An internal power supply and speaker may also be employed to make the instrument readily portable.

Abstract: A surge suppressing resistor for a disconnect switch is provided which has its interior and exterior surfaces in fluid communication with the atmosphere to achieve a greater cooling effect. A glass epoxy stacking rod is supported between the end flanges of the resistor assembly and is used when two or more resistor bodies are to be joined together to form a unitary resistor assembly. The stacking rod is stressed and compressive forces hold the resistor bodies together as a unit for structural rigidity and electrical contact.

Abstract: An improved electric resistance heater assembly for soldering tools, glue guns, hair dryers, heat pencils, paint removers, etc., includes, as the core of the assembly, an open-ended tube of a ceramic material having good electrical insulation properties with good thermal conductivity, low heat capacity and a high softening temperature. A conduit extends lengthwise through the wall of the tube from end to end thereof and first and second spring-tempered split metallic compression bands of smaller diameter than the tube are placed at each end of the tube and retained thereon by compressive stress. A plurality of turns of resistance wire are wound about the outer periphery of the tube between the bands with each end of the wire welded to a respective one of the bands. An first electric lead is welded to the first band. A second electric lead is welded to the second band and extends lengthwise through the conduit and exits the conduit near the first band.

Abstract: Small portable electrical resistance heated radiant heating unit useful for insertion in tube bores to effect localized high temperature heating. Useful for the internal heating of tubes and tube/sleeve assemblies in steam generators, having bores as small as 0.75 cm. or less, for brazing, stress relieving, and other applications.

Abstract: The leads to a heater for an electrothermal hydrazine monopropellant thruster comprise tungsten conductors wrapped with smaller diameter tungsten support wire and insulated with beads of alumina (Al.sub.2 O.sub.3). A transition section connects the leads to regular leads. An attaching support wire is attached to the heater at one end and to the transition section at the other end. The insulated conductors and attaching wire are wrapped together with nickel ribbon to form a sheath.

Abstract: A miniature resistive temperature detector is fabricated by winding wire about a ceramic, or equivalent, cement coated graphite mandrel or form having a greater length than the resulting detector, coating the wire except for the lead portion with a ceramic, or equivalent, cement and cutting the wire and breaking the form to produce the miniature detector. A plurality of miniature detectors may be fabricated on a single form or mandrel with space between each detector to facilitate breaking.

Abstract: A suction-type desoldering device includes an elongated tubular heater assembly secured to the forward end of a hollow handle by a radial flange on the assembly. A removable solder collecting chamber adapted to have a vacuum created therein is disposed within the handle and has an open end connected in solder flow communication with the heater assembly by means of a compressible sealing member disposed between the flange and the open end of the chamber. The heater assembly includes a tubular sleeve secured to and extending through the flange adjacent the seal. A tubular support having a length of electric resistance heating wire wrapped therearound is mounted coaxially within and spaced from the tubular sleeve and has one end thereof extending freely into the collection chamber and the other end thereof receiving a removable tubular desoldering tip.

Abstract: An electric heater assembly for tools having a removable heated tip includes a tubular metal base having an open end adapted to removably receive and hold the end of the tool tip. A coating of ceramic electrical insulation material is provided on a portion of the exterior of the base and a length of Nickel-Iron alloy resistance wire is wound on the ceramic coated portion. Electrical lead wires are connected in lapped relationship to the respective ends of the resistance wire. Each lead wire includes a first portion lying between several turns of resistance wire and the ceramic coating on the base and a second portion bent back and overlaying the several turns of resistance wire. The second portion is wrapped with at least one additional turn of the resistance wire. A coating of ceramic electrical insulation material is provided over the resistance wire and the terminals to seal the same from the deliterious effects of the atmosphere.

Abstract: A glow-plug ignitor for diesel engines and the like, comprising a tubular body having external screw threads and an adjoining hexagonal formation by which a tool such as a wrench can be applied to the body to screw it into the threaded cavity of a cylinder. Next to the hexagonal formation is a spade lug connector for bringing current to the plug, the connector being so arranged as to permit the application of either a socket-type wrench or else a box-end wrench. The inner end of the body has an elongate projecting pin on which there is a tightly wound resistance coil that becomes incandescent when excited with the proper electric current. The valleys of the coil show higher temperatures, for a given heating current, due to the radiation and reception of radiated heat involving the opposed surfaces; therefore, starts at lower engine temperatures are improved.

Abstract: Wire-wound resistor covered with a layer of enamel on the basis of a zinc borosilicate having a composition:______________________________________ SiO.sub.2 6-18 CaO 5-12 B.sub.2 O.sub.3 35-60 Al.sub.2 O.sub.3 5-15 Na.sub.2 O 2-12 ZrO.sub.2 5-10 ZnO 10-25 CoO 0,1-2 ______________________________________wherein Al.sub.2 O.sub.3 +ZrO.sub.2 exceeds twice the Na.sub.2 O-content and some maxima for permissible contents of other oxides, including coloring oxides, are indicated.This enamel provides a proper solution of the problem of composing an enamel being adequately alkali-proof and being located in the proper range of coefficients of expansion for Ni-Cr and Ni-Cu-wire.

Abstract: An electric heat storage apparatus comprises an electric heating element, a ceramic heat storage pipe, an air passageway in communication with the pipe, and a thermostatically controlled air circulation means. The ceramic pipe has a scalloped-shaped outer surface providing a plurality of crests and troughs and a series of parallel grooves cut in at least some of the crests. The heating element is located in the grooves in contact with the pipe. In a preferred embodiment, the pipe is provided with a plurality of internal ribs of at least two different lengths. The pipe is supported on a ceramic cradle and a ceramic sponge or metal turnings are inserted into the pipe between the ribs to increase the heat transfer area.

Abstract: An electric contact or circuit breaker device comprises a base member and an operating member. In a surface of the base member, there is provided at least one elongated indentation wherein an electric conductor is inserted and is without electrical connection with the base member. The operating member includes a cover layer of a resilient material which extends over each indentation in the base member. The cover layer is electrically conducting in order to establish electric connection between the cover layer and the conductor, when a pressure is applied to the cover layer in a direction towards or into the indentation. When the pressure ceases, the resiliency of the cover layer will break the electric connection. The electric contact device thus provided can be sealed in a simple and effective manner against intrusion of dirt and damp and the parts of the device are subjected to minimum mechanical wear.

Abstract: The present invention is directed to an electric cartridge-type heater for use as a simulator for a nuclear fuel pin in reactor studies. The heater comprises an elongated cylindrical housing containing a longitudinally extending helically wound heating element with the heating element radially inwardly separated from the housing. Crushed cold-pressed preforms of boron nitride electrically insulate the heating element from the housing while providing good thermal conductivity. Crushed cold-pressed preforms of magnesia or a magnesia-15 percent boron nitride mixture are disposed in the cavity of the helical heating element. The coefficient of thermal expansion of the magnesia or the magnesia-boron nitride mixture is higher than that of the boron nitride disposed about the heating element for urging the boron nitride radially outwardly against the housing during elevated temperatures to assure adequate thermal contact between the housing and the boron nitride.

Abstract: A probe-like, vibration-resistant fast-heating electrical heater assembly for use in a pollution sensor of an exhaust monitoring system for internal combustion engines, which comprises an elongate metal tube having concentrically disposed therein a metal conductor rod which is insulated from the tube. At one pair of corresponding ends, the tube and rod carry a ceramic coil form having an open winding on it comprising a helical resistance coil that is disposed in a helical groove of the coil form. Ceramic cement is utilized to secure the coil form in place, and also to mount the conductor rod in the conductor tube whereby a rigid, vibration-resistant assemblage is had that can also withstand high temperatures. The conductor tube is carried in a terminal post that has an annular flange at one end for the purpose of mounting the heater assembly in the associated equipment.

Abstract: An electric air stream heater adapted to operate directly on 120 volts with a wattage output of less than 500 watts without the need for any special control module, comprising, a cylindrical heating assembly having at least two spaced apart, parallel electrically connected lengths of crimped metallic foil provided with electrical power connections and secured to an insulating backing and rolled around an insulating core. Ceramic pins and a thermostatic control element which extend radially through the heating unit provide respectively, support means to prevent sagging of the heating elements in use and a means for detecting heat build-up across a large cross sectional area of the heater while creating a minimum of air flow resistance.

Abstract: This specification discloses a cut-in resistance for motor vehicle heating fans with a first resistance wire winding which can be cut into an electric fan motor either alone or in series with a second resistance wire winding. The first winding is arranged in the interior of a ceramic tube and the second winding is arranged on the outside of the ceramic tube. The ceramic tube is retained solely by the ends of the resistance wires which are passed upwards to a ceramic plate and clamped by flat plug contacts. This produces a compact arrangement wherein the ceramic material can safely store generated heat without danger of heat damage to adjacent plastic components.

Abstract: A coil assembly is formed by an elastic metal wire helical extension spring coil having convolutions resiliently urged towards each other and held apart by spacers pinched between the convolutions and held there by the spring-back of the convolutions. The spacers can interspace the coil convolutions and be made to extend radially inwardly and outwardly beyond the inside and outside of the coil, so as to radially space the coil from a coil center and the inside of a tubular casing enclosing the coil. In this way a tubular radiant heater can be made by using electric resistance wire to form the coil and making the spacers from refractory insulating material.

Abstract: An electric air heating element is designed for positioning in the cylindrical or conical outlet tube of a hair dryer. It consists of a star-shaped coil carrier in the shape of four fins extending radially from a common center line in the axis of the outlet tube towards the tube walls. The fin edges are serrated by adjacent rectangular slots, the slots on each edge penetrating alternately to a shallow and to a greater depth, and a ribbon-shaped resister laid into these slots is helically wound around the coil carrier. In this way successive windings lie in different planes and air turbulence around the heating coil is thereby increased, improving the heat transfer between the resistor windings and the throughflowing air.

Abstract: A wire wound resistor is vertically disposed in a vessel. The resistor has a former of between 20 mm and 45 mm diameter and resistance wire of a resistance of between 1 and 4 ohms per turn connected in the circuit of an A.C. bridge circuit. Impedance change is indicated on a display unit calibrated to indicate the change in level of liquid e.g. milk in the vessel. The resistance wire is laid on the former by applying ultrasonic sound energy to soften the former which is of polysulfone or polycarbonate and the wire embedded in the softened former material. The vessel is shaped at the lower end to assist in giving linear readings when the level of liquid is low.

Abstract: A porcupine wire coil of electric resistance wire is positioned in a tube having an electrically insulating inside in which the peaks or looped ends of the coil convolutions are embedded so as to hold the coil convolutions spaced from each other. When the coil is energized, fluid flowed through the tube can be heated.

Abstract: An electrical heater is combined with a thermostat in a sealed enclosure itself sealed in a glass tube, the enclosure comprising two tubes telescoped together, one being translucent and containing the thermostat and the other being of electrically insulating material, e.g. ceramic.

Abstract: A probe-like temperature sensor assembly has a body carrying thereon a length of electrical resistance wire coiled thereabout and having ends of such coiled resistance wire electrically connected to respective terminal means; the resistance wire changes its electrical resistance in response to the temperature of such wire resulting primarily from the heat communicated thereto from the sensed environment; the portion of the body about which the resistance wire is coiled is provided with a slot-like or relieved portion as to accommodate for difference in the rates of thermal expansion in the materials forming the body and resistance wire as to thereby preclude the mechanical fracturing of the resistance wire by the body which would otherwise occur due to a comparatively excessive rate of thermal expansion in such body.

Abstract: Stamped and formed connecting device for splicing a small diameter lead wire to a larger diameter resistor core comprises a U-shaped connecting member having a web and sidewalls. The web has a semicylindrical central depression for the lead wire and has arcuate portions on each side of the depression which conform to the resistor core. The sidewalls are reversely folded at their outer ends to provide inner and outer layers. The ends of the inner layers are located adjacent to the depression. In use, the lead wire is located in the depression, the resistor core is positioned between the sidewalls, and the sidewalls are crimped onto the resistor. The ends of the inner layers move relatively towards, and against, the lead wire during crimping and establish contact with the lead wire. Contact with the resistor core is established by the inner surfaces of the inner layers of the sidewalls.

Abstract: An electrical temperature sensing device for food heating appliances such as toasters and the like which is constructed to provide rapid thermal response, significant resistance variation as a function of temperature, and good mechanical strength so as to be suitable for mounting within the food heating compartment of said appliances in close thermal coupling with the bread or other food article to be heated. The temperature sensing device is in the form of an elongated tubular structure shaped in a U configuration, comprising a central core of low mass insulating material upon which is wound a helical wire of temperature sensitive resistance material. A thin walled sleeve of insulating material fits tightly over the wire wound core, and a thin walled metal tubing of good heat conduction characteristics fits tightly over the insulating sleeve.

Abstract: A heater comprising a metallic tubular sheath in which an elongate electrical center conductor is coaxially disposed therewithin. A fibrous, inorganic electrical insulation material is wrapped around the center conductor and an electrical resistance heating element surrounds the enwrapped center conductor, the heating element being coaxial with the center conductor and electrically connected thereto with the heating element and the conductor being adapted to be connected to a source of electrical power to energize the heating element. Other electrical insulation material is disposed between the heating element and the sheath to electrically insulate the heating element from the sheath and to provide a conductive heat transfer path between the heating element and the sheath. A method of manufacturing a heater is also disclosed.

Abstract: An electrical heater comprises a sealed glass tube containing a sealed tubular structure formed by, (a) a metal tube containing an electrical heating element insulated from the metal tube, and (b) a plastics tube sealed to one end of the metal tube and containing a thermostat for the heating element.

Abstract: A precision resistor wherein the resistor wire is deposited in a sinuous pattern on the adhesive surface of a thin, flexible tape of electrical insulating material. In winding the tape onto a multibobbin coil form the intermediate flanges of the coil form have a flat portion of reduced radius. A coil of tape is wound on one bobbin with the adhesive side against the bobbin and is passed over the flat portion of an intermediate flange. At the crossover the tape is pressed to conform to the shape of the flange and then passed around the axial body of the adjacent bobbin to commence the winding of the next coil of tape on the adjacent bobbin.

Abstract: This electric heating device comprises a support surrounded by a resistance wire and located within a vacuum outer tube, said resistance being spaced from the inner surface of the outer tube. In order properly to position the support and resistance wire on the center axis of the tube, a mounting assembly is provided at each end of the support. Said mounting assembly comprises a resilient cap-shaped centering member having an annular ring portion surrounding the support, clips limiting the engagement of said cap-shaped member onto said support, and outwardly extending resilient arms engaging the inner surface of the outer tube in order to center the support and resistance wire within said outer tube. A supply lead is connected between said resistance wire and an output/input conductor. Said supply lead comprises a longitudinal portion extending along the support and a radial portion connected to said conductor within a supporting glass case or bead projecting into the outer tube from its end.

Abstract: A control apparatus for determining the pitch of the sound produced by an electronic music synthesizer incorporates a conductive ribbon having a manually adjustable contact with a second conductive element, the second element comprising an elongate helically wound resistance element supported by being cemented in a groove in a base member.

Abstract: A resistor with a low temperature coefficient comprises, by way of example, a main wire wound resistor having a low temperature coefficient on the order of -4.0 PPM and a resistance on the order of 1 K.OMEGA. connected in series with an auxiliary resistor having a temperature coefficient the magnitude of which is substantially greater than that of the main resistor and the polarity of which is opposite to that of the latter, for example, on the order of 4000 PPM and having a resistance which is greatly reduced as compared with that of the main resistor, for example, on the order of 1.OMEGA.. The composite resistor has a resistance of approximately 1 K.OMEGA. and a temperature coefficient which is less than 0.5 PPM.

Abstract: A hand manipulated electrically heated stylus tool for transferring insignia to an article from a ribbon or sheet having a coating on one face thereof subject to release and transfer to an article to be printed which operates on a 115 volt power supply without use of a voltage reducing transformer or temperature control means. The tool includes an aluminum mandrel with a surrounding sleeve of heat shrinkable Teflon on which a heating element of high resistance insulated wire is wound so that the sleeve provides back-up insulation between the wire and mandrel. The mandrel is provided with a bore which receives the tip portion of a conventional ball point pen, thus forming a heated stylus. The heated stylus assembly is disposed within a hollow frusto-conical support and is secured therein by a hardenable mixture forming heat insulation between the assembly and the support.

Abstract: A resistance thermometer sensor is provided by forming a path of electrically conducting material secured on an insulating base. The path is shaped as a loop having two side-by-side portions. A shorting bar connecting across these portions to short circuit part of the loop is adjusted along their length to trim the ice point resistance of the sensor as required. When suitably adjusted, the shorting bar is fastened in position, for example by welding. In one example, the sensor comprises a bifilar helix of resistance wire wound and secured on a cylindrical former.

Abstract: A glow-plug .[.ignitor for diesel engines and the like,.]. comprising a tubular body having external screw threads and an adjoining hexagonal formation by which a tool such as a wrench can be applied to the body to screw it into .[.the.]. .Iadd.a .Iaddend.threaded cavity .[.of a cylinder.].. Next to the hexagonal formation is a spade lug connector for bringing current to the plug, the connector being so arranged as to permit the application of either a socket-type wrench or else a box-end wrench. The inner end of the body has an elongate projecting pin on which there is a tightly wound resistance coil that becomes incandescent when excited with the proper electric current. The valleys of the coil show higher temperatures, for a given heating current, due to the radiation and reception of radiated heat involving the opposed surfaces.[.; therefore, starts at lower engine temperatures are improved.]..