Abstract: A portable flashlight assembly utilizes a flat battery energy source containing slide contact electrodes. One embodiment includes the use of a film pack from a self-developing camera as an energy source.

Abstract: Corrosion resistance is provided to metal substrates by the application of a hydrophobic resinous substance containing slightly alkaline particles in suspension. When applied to the metal substrate surface the cured resin provides a controlled diffusion barrier to the particles contained therein. Upon exposure to a liquid medium containing dissolved acid salts the alkaline substance leaches through the coating to neutralize the solution. The corrosion resistant coating is especially effective as an automotive finish primer and an autobody undercoat.

Abstract: A clarinet barrel having fixed internal dimensions is provided with a plurality of throat members having a fixed outer dimension for insertion within the clarinet barrel. The inner dimensions of the individual throats are varied in order to provide varying tonal qualities to the clarinet. The throat member can be fabricated from materials other than wood to provide further tonal qualities.

Abstract: The invention provides an improved circuit for determining rates of rise of energy in metal oxide varistor devices. A high voltage transformer is employed to trigger a protective air gap for bypassing the metal oxide varistor device. One application for the invention is for use within a series capacitor protective circuit.

Abstract: An electrically insulating wire coating material comprised of the heat cured product of a mixture of polyvinylacetal and phenol-aldehyde resins, or a mixture of these resins with epoxy resins, and a catalyst from the special metal containing group of cyclic organic compounds known as chelates and which can be further defined as being a non-ionic inner complex salt. These materials give insulating coatings with improved flexibility and thermal aging properties.

Abstract: Insulating coating compositions for electrical wire are prepared by a method which includes a dehydration process to prevent any reaction from occurring between adsorbed moisture and the catalyst before the coating is electrostatically applied to the transformer wire.

Abstract: The addition of a polyisocyanate to high solids wire coating compositions of the type consisting of a mixture of polyvinylacetal, phenol-aldehyde and epoxy resin systems improves the properties of the coated wire over a wide range of operating conditions.

Abstract: A carrying case for the accessories including reeds used with woodwind instruments. An insert is provided within the case and has a multiplicity of flat surfaces located longitudinally on its outside surface for holding reeds with an opening extending longitudinally within the insert for storage.

Abstract: Transformer coils wound with disk winding sections nonsequentially arranged are provided with shields between the turns of mechanically adjacent sections to increase the series capacitance of the winding. The increased series capacitance of the winding allows a reduction in insulation between the individual winding turns and between the winding discs.

Abstract: Zinc oxide varistors are thermally treated, after sintering, at temperatures between 400.degree. C. and 800.degree. C. in air for a period of one to ten hours. The thermal treatment apparently removes residual strains resulting from the sintering process and substantially reduces voltage drift.

Abstract: A device to monitor dissolved gases in electrical insulating liquids such as transformer oils. The monitoring device includes a sampling means to obtain a liquid sample from the electrical device whose liquid is being monitored, a gas extraction means to extract the dissolved gases from the liquid sample, an injection means to inject the extracted gases into a gas chromatograph, and a gas chromatograph to analyze the dissolved gases to determine the concentration of various dissolved gases.

Abstract: Feedthrough bushings containing electrically conductive coatings on the porcelain outer shell are provided with means for electrically monitoring the state of conductivity of the coatings. An electrical feedthrough connecting with the electrically conductive coating at one end provides an efficient means for connecting with current measuring devices to determine the current through the coating while the bushing remains energized.

Abstract: A vaporization cooled transformer of the type comprising a transformer tank in combination with a heat exchanger employs temperature sensing means in both the tank and the heat exchanger for sensing a predetermined temperature differential to indicate the presence of air in the transformer. When the temperature differential exceeds a predetermined range, an alarm and a transformer disconnect relay become actuated. The temperature differential sensor can also be calibrated to provide excess moisture indication above a threshold moisture content caused by the saturation of the molecular sieve water scavenger within the transformer assembly.

Abstract: A three-phase electrical transformer utilizes a conductor independent of the transformer windings for sensing zero sequence current upon the occurrence of a ground fault. A current transformer coupled with the independent conductor provides polarization to protective relay devices. One embodiment utilizes the transformer internal tank shield in combination with the current transformer for providing zero sequence current.

Abstract: A dual-hinged case adaptable for holding various items and in particular one or more types of reeds used in musical woodwind instruments. A dual-hinged case is provided capable of utilizing varying holding means to permit the safe retention of various types of items, as for example, reeds such as those used by a clarinet or saxophone and those used by an oboe, English horn or bassoon.

Abstract: This invention relates to a gauge for measuring the internal diameter of a passage. The gauge comprises a tapered calibrated cone with an extendable rod member. The tapered cone is inserted within the passage and the rod is extended to contact the edge of interior surface of the passage adjacent the diameter to be determined.

Abstract: A heat transfer system for voltage surge arresters employs a dual radius arrester housing in combination with a plurality of sleeved zinc oxide varistors to efficiently cool the varistors during operation. The sleeved varistors are held in thermal contact with a large portion of the porcelain housing. The porcelain housing provides a heat sink facility to the arrester both during normal operating and voltage surge conditions.

Abstract: A solid state, reverse power flow detector and control circuit which samples the line voltage and current, once each cycle. The voltage sampling circuit includes a pulse generator providing a voltage pulse of short duration at a given time or phase angle in each cycle. The voltage signals are applied to an SCR through a gate operated by the current signals. In one embodiment, the gate comprises a single transistor. With forward or no current, the gate does not allow the voltage signals to reach the SCR. When current reverses, the gate allows the voltage signals to trigger the SCR. The SCR turns on a transistor energizing a relay, after a brief delay. The relay acts to set the regulator or other device in power reverse condition. When current again is forward, the relay is deenergized and the device returned to the forward condition.

Abstract: A plurality of series connected main spark gaps are connected in shunt circuit relation with a voltage grading impedance network which includes a trigger gap that is connected though frequency responsive coupling means in shunt relation with approximately one-half of the series connected main spark gaps. The trigger gap is operative, as a substantially linear function of a voltage impressed across the series connected gaps, to cause the main gaps to spark over in cascade fashion. The triggered control network allows use of a large number of main gaps but with a controlled total sparkover very much less than the sum of the sparkover of the individual main gaps, thus, providing a desirably high ratio of reseal voltage to sparkover voltage for the main gap series circuit.