Abstract: A triggered vacuum gap tube includes an evacuated envelope with high voltage terminals at opposite ends of the envelope. The envelope is divided into two chambers by a mid-plate therein having a centrally located aperture therethrough. The first of the two chambers has an end plate mounting one of the high voltage terminals and also mounting an array of rods or electrodes which extend inwardly toward the mid-plate. The second of the two chambers also has an end plate mounting the other high voltage terminal and also having an array of rods or electrodes extending therefrom toward the mid-plate. The mid-plate has mounted therein an array of through rods or electrodes which extend in one direction into the first chamber and in the opposite direction into the second chamber. The through mid-plate mounted electrodes lie in side-by-side spaced relation with the end plate mounted electrodes in both the first and second chambers.

Abstract: A non-destructive screening device for a glass diode includes a first circuit which determines a semiconductor element is acceptable when detecting a current oscillation caused by a micro plasma oscillation arising when the semiconductor current avalanche, and a second circuit which determines that the semiconductor element is unacceptable when detecting a void discharge due to a detrimental void, when a saw tooth signal pulse, which is to be built up to a level corresponding to the avalanche operation of the semiconductor and restricted to a current from a constant current source, is applied in a reverse direction to a circuit including the semiconductor element passivated with glass and a resistor connected in series thereto. According to the above discriminating operations, a material to be inspected may be screened in a non-destructive condition.

Abstract: A method and apparatus for providing output indications in response to the presence of an electromagnetic energy receptor within a predetermined distance of a glow discharge device the electrodes of which have a voltage applied thereacross at least equal to the maintaining voltage but less than the breakdown voltage, including an excitor for generating an electromagnetic field around the glow discharge device at a strength less than the ionization level but sufficient to ionize the gas when the electromagnetic energy receptor is within the predetermined distance of the glow discharge device.

Abstract: A thyratron is provided with a baffled structure between its cathode and first control electrode. The baffled structure consists of a series (e.g. three) annular baffle plates, each having a central aperture aligned with the axis of the cathode, mounted on the end of a cylindrical heat shield surrounding the cathode. The final annular baffle plate, adjacent the first control electrode includes a solid disc within its central aperture.

Abstract: Crossed-field switch device has a continuous elongated closed path active plasma discharge region between adjacent electrodes. A magnet produces a magnetic field at an angle to the electric field to define the elongated active region in the interelectrode space where glow mode discharge occurs. The electrodes and magnetic field are shaped so that the glow mode discharge in the active region is elongated.

Abstract: An oscilloscope includes means for intermittently or periodically adding electrical values to the horizontal and vertical deflection signals thereby producing a convenient juxtaposition or superposition of selectable portions of an input signal.

Abstract: A method and apparatus for detecting predetermined operating conditions of a machine driven by an electric motor, in which a filtered electric signal is utilized. The filter is designed to signal the occurrence of frequencies within a predetermined band, thereby enabling detection of an event characterized by the occurrence of such frequencies. The output of the filter can be used, for example, in a further device to operate an alarm, turn off the motor, reduce the feed to the machine, or any other suitable control action.

Abstract: A probe for testing an electrical circuit includes a dielectric support body and a pair of spring arms each having an inner end fixed to the support body and an outer end free to deflect with respect to the support body. Means for connecting the outer ends of the arms supports a probe tip having a point movable with the deflection of the arms into contact with a predetermined point on the electrical circuit to be tested. Means responsive to a signal provides for the deflection of the arms and the movement of the probe tip into contact with the chip. The arms have different lengths providing the probe tip with movement along a substantially straight line with respect to the plane of the electrical circuit.

Abstract: For HID lamps, and particularly high-pressure sodium-mercury HID lamps, the electron-emissive material portion of the lamp electrodes is a solid solution of dibarium calcium tungstate and dibarium calcium molybdate wherein the molar ratio of tungstate to molybdate is from 9:1 to 1:9. Emissive properties of the electrode are good and vapor pressure of emissive material is low.

Abstract: A source for generating singly and/or multiply charged ions composed essentially of a glow cathode, an intermediate electrode and an anode electrode having a common axis of symmetry and bordering a gas discharge chamber and each presenting a passage opening coaxial with the axis of symmetry, and a system producing a magnetic field having an axial component along the axis of symmetry, with the anode electrode opening being at a location where the magnitude of the axial component of the magnetic field is substantially equal to its maximum value.

Abstract: A gas-discharge tube especially adapted for use as an over-voltage arrestor containing a radioactive material for pre-ionizing the gas filling is provided in which a radioactive material is applied to at least a portion of the surface of a pair of spaced electrodes located in the tube.

Abstract: A method and apparatus for producing high power, coherent microwave radiaton in which a beam of high speed (above 0.5 light speed) electrons are propagated through a linear path in a waveguide tube including low dielectric constant material adjacent the path so that the electromagnetic radiation is slowed in the material and the beam coupled to the radiation. The beam is focussed and guided to destabilize the guided electro-magnetic modes and to convert the beam energy into high power, high frequency, coherent microwave radiation.

Abstract: Spark plug for internal combustion engines with center and ground electrodes consisting of base metals, base metal alloys, or metallic composite materials, said center electrode or both electrodes being coated at least on their ignition areas with a metal or metal alloy having an average atomic weight of more than 100 and a melting point above 1500.degree. C. The metal coating is deposited by crystalline growth on the electrode surface in a thickness of 5 to 100 microns, preferably 15 to 60 microns using the vapor deposition technique or molten salt electrolysis. The cap-shaped coating is applied to the frustro-conical ignition area of the center electrode.

Abstract: An electrical meter for use with a standard watthour meter and a standard meter socket having a housing which includes a display area, a meter receiving section having a base plate which supports a plurality of jaw members positioned to receive the blades of a standard watthour meter, meter socket engaging blades extending rearwardly of the housing and positioned to engage the jaws of a standard meter socket, an electrical meter assembly supported within a longitudinally disposed part of the housing and in tandem relation with the watthour meter and the meter socket including an indicator located adjacent the display area, a plurality of conductors connecting the blades to the jaw members, the electrical meter assembly being coupled to at least one of said conductor means to provide a power measurement on the indicator, the housing and the electrical meter assembly in said housing being located within a circumference defined by the rearward projection of the circumference of the base of the standard watthour

Abstract: A high voltage measuring device used to measure the amount of voltage in an alternating current carrying line. When in use no connections or physical contact are made between the line and the measuring device. Generally, the measuring device acts according to the capacitor divider principle with two capacitors. One electrode of one capacitor is the high voltage line itself and the other electrode of this same capacitor is a spaced flat circular plate located on the measuring device. The measuring device electrode is insulated near its periphery and connected to a low voltage capacitor having a low loss and good temperature coefficient. This capacitor forms the other part of the capacitor divider.

Abstract: The disclosure is of a display panel which includes a gas-filled envelope which contains cathodes and anodes spaced apart from each other and formed into rows and columns of dotlike cells by an insulating cell sheet. The insulating sheet is of a glassy material and is coated with an opaque, slightly reflective, resistive material such as silicon. The coating provides good display contrast by hiding the cathode glow of the priming cathodes in the panel.

Abstract: A system for tracing electrical cables within a building utilizing in combination a pulsing electrical load and a standard clamp-on type ammeter. In operation the intermittent current flow can easily be detected and cables can readily be traced from outlet to circuit breaker. The novel pulsing electrical load draws current at a characteristic rate that is independent of the amount of current drawn, so that various load resistances can be used, to suit the circuit being traced. If desired, the standard clamp-on ammeter could be replaced by a detector designed for use with the pulsing load.

Abstract: An electric trouble finding apparatus comprises means to test either hot or cold circuits with a single unit. The apparatus comprises a first pair of binding posts which serve as the coupling means to a hot output and a second pair of binding posts which may serve simultaneously as connecting means to a cold or inert circuit. The unit includes a four pole double throw switch having a single lever control and a plurality of twelve terminals in the switch arrangement. A first pair of oppositely positioned switch terminals are connected to an AC power source while a second pair of opposite terminals in the switch are connected to respective hot binding posts. One of the cold binding posts is connected through a lamp to a terminal in the switch while the opposite terminal is coupled to the other cold binding post. A pair of terminals in the switch are interconnected while another pair of terminals in the switch are coupled to the hot outlet from the power supply.

Abstract: A method for making a heat sensitive fault detecting and indicating device for a watthour meter is disclosed herein. The illustrated method is particularly useful for a watthour meter that conventionally includes a potential stator and a current stator both of which are mounted thereon one or more permanent magnets and a rotatable disk assembly with disk rotation being recorded on the recording dials of a register assembly visible through the enclosing glass cover of the meter. The current stator of such a meter normally includes a pair of current coils that are heat responsive and a method is disclosed for providing a heat sensitive fault detecting and indicating device that may be associated with such coils.

Abstract: An electromagnetic sensing apparatus includes one or more magnetic cores coupled by windings to a pair of transmission line conductors for sensing the presence, and in some cases the magnitude and direction of loop currents flowing in the transmission line, without interfering with the transmission of signal information therealong. In one embodiment, the direction of loop current flow in the transmission line conductors is detected by applying a steady-state electromagnetic bias to the magnetic core to cause a polarity or direction determining asymmetrical response in a sense circuit that is electromagnetically coupled to the core by a sense winding. In another embodiment, a pair of separate magnetic cores are used, each having associated drive windings connected in series with the transmission line conductors, and associated sense windings.