Abstract: Substrate for nickel hydrogen battery electrode is etched from nickel sheet metal to provide inner and outer rims 54, 56 for self centering, a tab 62 on which a lead can be welded and properly distributed openings through conductors for optimum ion flow and electric conduction.

Abstract: A cross-field discharge plasma is used to supply charge carriers for a grid controlled cold cathode discharge device. A dc magnetic field is employed to sustain the crossed-field discharge when the source grid is active. The device comprises an anode, a cathode, a source grid, and in alternate embodiments, additional control grids. Preferably the magnetic field exists only in the source grid-cathode space and penetrates only weakly, or not at all, into other electrode gaps or spaces. The source grid-cathode plasma is effectively a source of charge carriers, electrons or ions, controlled by the source grid current, the anode current being an approximate linear function of source grid current within limits, and/or controllable by adjustment of control grid potentials.

Abstract: The faulted cable is connected in a loop with a spark gap at one end. Voltage is applied until the spark gap breaks down and the arrival time of the resultant forward wave is measured at both ends of the loop to measure total cable length. Next, the spark gap is opened and the voltage is built up until the fault breaks down. The time of receipt of the wavefront at the two ends of the loop is measured to determine the location of the fault. The apparatus comprises the power supply equipment, the spark gap and the time measuring equipment with its voltage divider and clamp.

Abstract: Regenerator for a cryogenic system has lead sphere 58 packing and has grooves 54 and 56 in the regenerator walls to prevent gas bypass. Felt packing 66 between screens 64 and 68 causes continued compression of the regenerator packing as it changes size due to temperature changes. Gas spaces between the regenerator spheres is maintained low and regenerator sphere damage due to high intersphere loading is minimized.

Abstract: Screw expander is employed in closed cycle steam power cycle and employs heat extraction during steam expansion to improve Rankine cycle efficiency.

Abstract: Electron beam microfabrication apparatus has spherically concave photocathode pattern 40 which when excited produces patterned electron beam 48 which is accelerated by electrode 44 and magnetically focused by magnet 58 to impinge as a demagnified patterned field 60 on a photoresist carrying semiconductor wafer 36 mounted of wafer holder 34.

Abstract: There is disclosed a polarizer particularly suited for use in the infrared wavelengths which comprises a wire grid polarizer in optically cascaded relationship with a Brewster's Angle Polarizer. Not only do the extinction ratios of the optically cascaded polarizers multiply to provide higher extinction ratios at these wavelengths, but also the reflective mirror properties of the wire grid polarizers can be used in combination with the known optical properties of Brewster Polarizers to provide a combined device which optimizes both the extinction ratios achieved and the balance between the reflection and recombination problem of the system on the one hand and the offset or beam walking problem on the other hand in a manner to provide optical characteristics which are not achievable from any simple combinations of either type of polarizer alone.

Abstract: There is disclosed an integrated optical design of head-up displays suitable for use in aircraft cockpits and the like. The display system is comprised of a holographic optical element used as the combiner for presenting a direct view of the exterior on which are superimposed image signals generated by a source device such as a cathode ray tube and transmitted to the combiner through an optical system including a relay lens containing tilted and decentered optical elements to compensate for the aberration present in the holographic optical element. There are further disclosed four relay lens design forms particularly suited for use in the design of such holographic head-up displays. The disclosure includes integrated designs in which (a) the holographic element may or may not be constructed with aberrated wavefront and (b) a beam splitter is incorporated for insertion of a stand-by sight, possibly also being tilted for the correction of aberrations.

Abstract: Unitary light-handle structure attaches to underwater camera to serve as a properly directed strobe light source structure for the camera and as a handle structure by which the camera can be pointed and controlled. The handle contains the strobe light source, as well as its charging and firing electronics and its power supply batteries.

Abstract: The change of angular acceleration sensor has a wire wound rotor resiliently mounted for rotation about a sensing axis and has a magnetic field at right angles to the sensing axis and across the wound rotor so that a signal voltage is generated in the windings by the motion of the windings in the field in accordance with the third time derivitive of angular motion of the sensor about its sensing axis.

Abstract: Multilaminate printed circuit boards have at least three conductor layers separated by two insulator layers. After drilling through the boards, cleaning of the drilled hole is accomplished by forcing a slurry of granular abrasive grit in a liquid carrier through the hole. Manifolds direct the slurry through the holes thereby cleaning them.

Abstract: Open conductors in an electric power distribution system are detected by sensing the abrupt change in balance of transformer magnetizing current among phases, particularly the third harmonic of the power system frequency. The current is sensed in each phase and the absolute magnitude of the third harmonic current is compared among the phases. When imbalance exceeds a predetermined value, a signal is produced.

Abstract: The automatic fill-stop valve passes the liquid filling a tank. A level-sensing tube passes vapor until the tank liquid level rises that high, and, thereupon, passes liquid. Serial orifices in the sensing passage produce a valve closing signal when the liquid level reaches the sensing tube to automatically stop the filling of the tank.

Abstract: Soldering method comprises placing a cadmium-zinc-lead solder on a copper base and exposing the solder joint to about 200.degree. C. for at least one hour to produce a copper-cadmium-zinc ternary interface barrier layer which inhibits migration.

Abstract: There is disclosed a laser instrument which uses an infrared fiber optical waveguide to transmit a high power carbon monoxide or carbon dioxide laser beam for treating a selected part of the body. In one important application of the instrument, the laser beam is transmitted to the interior of the human body to perform surgical functions.

Abstract: A hatch cover is positioned in the hatch opening in the watch back over a battery receptacle in the watch module. The hatch cover is mechanically retained in the hatch opening by means of a snap-in friction fit. It has a rim on the watch back. A groove in the back adjacent the rim permits insertion of a tool to snap out the hatch cover. The watch back can remain on the case during battery change to hold the module in the case.

Abstract: The separated ion source combines an ion source and a magnetic mass separator within a single magnetic field geometry. The preferred ion source has a low voltage Penning discharge configuration and produces a charged particle beam in the form of a ribbon with a rectangular cross section.

Abstract: A crossed-field switch device is connected in parallel to a load device which may arc. The characteristics of the crossed-field switch device are that it will not conduct when a high voltage is applied, but when the load device arcs, the crossed-field switch device conducts, taking current from the arc so that the arc quenches. The crossed-field switch device thus is a crowbar which is automatically conductive when the applied voltage decreases due to a line or load short.

Abstract: Blood shut-off valve is positioned at the outlet of a blood oxygenator arterial reservoir so that the valve closes when the reservoir is emptied to prevent flow. Valve has a member which floats in the blood and an outlet valve seat against which the member rests in the absence of blood, together with a constraint which positions the member near the seat, but protects it from hemodynamic closing forces.

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.