Abstract: The existent current and thermal path of a diaphragm and a movable rod contained within an electronic switch are paralleled with a shunt which does not have to support external loads, and can thus be made of material more ideally suited for the transfer and dissemination of heat generated by the passage of current upon actuation of the switching device.

Abstract: A plurality of dual feed half square wave antenna element (each of U-shaped onfiguration) are arranged in a log-periodic structure. The antenna elements are feed at the current loops; i.e., at the corners of the U-shaped antenna elements. A dual inphase feed produces vertical polarization signals of low angle radiation, and a dual antiphase feed produces horizontal polarization signals of high angle radiation.

Abstract: The cycle life of rechargeable lithium batteries is significantly prolonged y applying to the battery as a charging mode a current interrupted at intervals of 1 milliseconds to 9 seconds in a frequency range of about 0.1 to about 10 Hertz.

Abstract: The face of a cathode surface is machined to provide a spiral surface fin with microscopic sharp symmetrical protrusions. The cathode gives enhanced emission due to field emission generated at the sharp symmetrical protrusions and due to the increased surface area.

Abstract: A broadband H.F. directional sky-wave antenna system comprises a plurality f interconnected, vertical, zig-zag, antenna sections of predetermined increasing height. A counterpoise is utilized to balance the antenna. Power is coupled to the shortest zig-zag section via an impedance matching transformer. A resistance is used to terminate the antenna in its characteristic impedance.

Abstract: A device is disclosed which uses permanent magnets to manipulate charged ticle beams, such as those employed in traveling wave tubes, wigglers, and undulators. Tapered pole pieces are inserted between magnets in a periodic permanent magnet array, and the taper is oriented away from the beam path. The magnets themselves may also be tapered, but the taper is oriented toward the beam path. Tapering is described according to the cross sections formed when the plane which contains the beam path intersects the magnets and pole pieces.

Abstract: A housing for optical fibers to be spliced including a pair of movable sleds for supporting the opposing fibers and directing the fibers into opposite ends of a central alignment guide. Retainer sleeves crimped about the cable ends and locator sleeves crimped around individual coated fibers are positioned in slots in each sled to provide precise locations for the fibers. Grooves in the sleds align the fibers for insertion into the guide upon positioning the sleds in recesses at each end of the housing. Movement of the sleds feeds the stripped and cleaved fiber ends through internally tapered rings and into the ends of the alignment guide. Two or more fibers from respective cable ends may be supported on each sled to provide two or more splices in the same housing. The housing device is readily assembled with the fibers aligned and held securely in place so that negligible optical losses result.

Abstract: A method and digital system for the compression and reconstruction of culal data for use with display systems, such as a system for producing a real time moving map display of terrain, provides a modified footprint/common boundary technique for data compression in which the footprint extends forward of the last point generated along a line in the direction of the line to that point. The particular scheme for compressed data reconstruction employs the storage of footprint data in such a manner that change in line direction information is automatically provided along with the necessary delta data information so that the direction of the line can be constantly updated as each point is generated. The compression of area cultural features involves a double compression of data based on a common boundary approach and the inner compression techniques of the modified footprint technique.

Abstract: The physical and electrical condition of electrochemical cells of a battery s monitored on a continuous basis so that corrective action can be taken before explosion and/or venting occurs by a method including the steps of:(A) coating the electrically conductive shell of each cell of the battery with a thin non electrically conductive layer,(B) applying a sensor stripe over the non electrically conductive layer so that the sensor stripe does not make electrical contact to the shell of the cell,(C) connecting leads to the sensor and then coating the sensor with a protective layer, and(D) connecting the sensor leads of individual cells of the battery into an electrical series circuit, the remaining leads of the series sensor circuit being connected to an alarm/control network that monitors the conductivity of the series electrical path.

Abstract: A low aging piezoelectric resonator is made from a plate of piezoelectric terial using standard resonator fabrication techniques with identical electrodes applied to both major faces of the plate; the electroded plate mounted in a suitable enclosure and the unit vacuum baked and sealed under high vacuum to remove as much contamination as possible, and a DC voltage impressed between the resonator electrodes and the enclosure to create a static electric filed within the enclosure.

Abstract: A wide range radiation dose rate meter for civil defense use, including a iger-Mueller tube used in a continuous counting mode and for measuring dose rates from the natural background to about 30. rads/hr., with an ion chamber arranged to measure higher dose rates up to 10,000 rads/hr. The instrument has a sample and record capability in which the selected radiation detector will have its output connected to a selected storage capacitor for a precise interval of time determined by a timing circuit and the storage capacitor will accumulate and hold a voltage proportional to the dose rate, which can be read by means of an electrometer at a later time. The instrument has a self contained hand cranked power supply and all components are selected for long shelf life.

Abstract: A ring-supported quartz crystal resonator having a circular peripheral surt region encircling an inner resonator region which is configured in the form of a domed arch wherein the top and bottom surfaces thereof are, respectively, convex and concave. In one embodiment the radius of curvature of the convex and concave top and bottom surfaces are substantially equal so that an arch of substantially uniform thickness is provided. In a second embodiment, the convex and concave top and bottom surfaces have different radii of curvature and, more particularly, the radius of curvature of the top surface is less than the radius of curvature of the bottom surfaces whereby a thickness of the inner region gradually increases uniformly toward the center. Such structures exhibit low resistance and improved mode spectrum.

Abstract: An optical fiber graded index connector wherein a graded index rod is emped having a bore extending along the longitudinal axis thereof, the ends of the optical fibers to be connected being inserted into opposite ends of the rod bore and positioned to a focal length until a maximum power output is detected at the required destination for which the connection is made.

Abstract: Dual waveguide lasers which are transversely excited in parallel from a con source of radio frequency are provided with one or more channels or bores connecting the laser cavities. The dimensions and configuration of the connecting channels are chosen so that the electric field from the applied RF excitation source will be higher in the connecting channels than in either of the paralleled waveguide gas discharge cavities, or that the electron collision loss to the nearby ceramic and metallic walls will be lower in the connectiong channels than in the aforementioned waveguide cavities. The initial gas breakdown is thus made to preferentially occur in the connecting channels and thus force initiation of both laser cavities simultaneously.

Abstract: A stripline transformer pulse generator includes a flat ribbon multiple conductor cable and a ground plane of electrically conductive material placed side-by-side and wound together in a coil to form a transformer. The extremities of at least some of the conductors are joined in parallel and connected to a load. A voltage supply and switch connected between the ground plane and one end of the cable brings about charging and discharging of the device.

Abstract: The apparatus is part of an optical radar set and comprises a high powered O.sub.2 pulsed transmitter laser which is injection controlled to operate at a fixed frequency offset from a lower powered CO.sub.2 local oscillator laser. A portion of the output of the local oscillator laser is applied to an acousto-optic Bragg cell, together with an RF signal equal to the desired intermediate frequency of the radar set. The upshifted first order output of the Bragg cell is injected into the transmitter laser for stabilization purposes. This results in a stable intermediate frequency for the optical radar set.

Abstract: A low voltage trigger pulse is coupled to a three-stage driver which genees therefrom a high amplitude (e.g., 20 amp.) decaying current spike of predetermined width. The current pulse or spike from the driver is coupled to the gates of a multiplicity (i.e., 12) of parallel-connected field effect transistors (FETs) to turn or switch the same to the "ON" state. A laser diode array is series-connected with the parallel connected FETs so that when the latter is switched ON a very high (100 amp.) current pulse is delivered to the laser diode array to enable the same. At the cessation of the pulser current drive, a passive pull-down technique is used to enhance the turn-off of the parallel-connected FETs so that the laser diode array is quickly disabled. A protective overload circuit sets a limit to the average current through the laser diode array without affecting the pulse burst current.

Abstract: A cathode suitable for use in a lithium electrochemical cell is made from a ixture of active cathode material, carbon, and non fluorinated linear chain polymer by a method including the steps of(A) dissolving the non fluorinated linear chain polymer in a non polar solvent at a temperature near the melting point of the polymer,(B) adding the active cathode material and carbon and evaporating the solvent, and(C) grinding the dried mixture into a fine powder and making it into a cathode by pressing the powdered mixture onto both sides of an expanded metal screen and then cutting to the desired dimensions.The cathode can be combined with lithium as the anode and a solution of 0.8 mol dm.sup.-3 LiAlCl.sub.4 in a mixed organic solvent of 24 mass percent 4-butyrolactone in 1, 2 dimethoxyethane as the electrolyte to provide a mechanically stable, relatively inexpensive lithium electrochemical cell having good cell performance.

Abstract: A cathode is provided for use in high energy primary lithium-thionyl chloe cell systems or calcium-thionyl chloride cell systems. The cathode comprises an expanded metallic current collector screen into which has been pasted a mixture of a low surface area conductive carbon black and a high surface area conductive carbon black previously mixed with a binder.

Abstract: A millimeter-wave circulator for microstrip use. The device employs an hexagonal ferrite element to selectively direct the propagation of electromagnetic energy through a Y-junction circulator. The device does not require an external biasing magnet and provides improved bandwidth for high frequency operation.