Abstract: A radar system having means for effectively eliminating or cancelling intering signals characterized by the side lobes of the radar antenna received signals. An adaptive side lobe canceller system is combined with a frequency selective limiter such that the adaptive side lobe canceller is sampled by the output of the frequency selective limiter to derive a weighting signal from the adaptive control circuit. The weighting signals effectively provide simultaneous cancellation of both broad and narrow band interfering side lobe signals.

Abstract: An inexpensive, flush mounted microstrip antenna which is frequency agile d has polarization diversity. The frequency and polarization of the antenna can be selected by selecting the location of shorting posts in the antenna. The use of switching diodes in place of shorting posts provides the means of electronically switching the frequency and polarization characteristics of the antenna. Frequency-agility provides frequency scannable microstrip antenna arrays which also have polarization diversity. Frequency-agility, polarization diversity and frequency scannable arrays are controllable by digital means such as a computer.

Abstract: The spark gap device disclosed herein comprises at least two sets of electrodes enclosed within a common chamber. A delay line is connected between successive sets of electrodes. An arc which develops across the first set of electrodes as a result of a voltage transient ionizes the gas in the chamber. The voltage transient is delayed by the time required to travel through the delay line. When the voltage transient arrives at the second set of electrodes, an arc develops in less time than was required at the first set of electrodes due to the fact that the gas in the chamber has been at least partially ionized.

Abstract: An improved high energy electrochemical power cell is obtained by adding cupric chloride to the high surface area carbon black cathode of a lithium-inorganic electrolyte cell.

Abstract: Base separation of cast explosives in projectiles is prevented by means of resilient device, such as a spring washer, positioned between the bottom of the fuzewell cavity in the cast explosive and the bottom of the fuzewell liner threadedly secured to the projectile. By tightening the liner, the spring washer is compressed, causing it to apply a force upward on the liner and downward on the cast explosive toward the base of the projectile, thereby allowing the cast explosive to move in response to thermal changes while maintaining it in contact with the projectile base at all times.

Abstract: The invention is an improved apparatus for the removal of sodium carbonate from cyanide plating baths. The method involves the precipitation of sodium carbonate by the effect of cooling the cyanide plating bath liquid. A container is submerged in the solution with the container opening extending above the plating bath solution level. The container is filled with dry ice and water which produces a temperature of approximately zero degrees centigrade inside of the container. The solution adjacent to the exterior of the container is cooled so that excess sodium carbonate is precipitated as a crystalline deposit. After a desired interval, the container is removed with the encrustation of sodium carbonate for disposal.

Abstract: An infrared detector array and its associated read-out conductors on a surate are covered with an electrically insulating photoresist layer. This layer is metalized, and a thin photoresist layer is applied atop the metal. The thin photoresist layer is exposed through a mask having perforations corresponding to the detectors of the array and to desired bonding lead regions on the conductors; when the layer is developed, regions of the metal are thus uncovered. These uncovered regions are then etched away and the insulating photoresist layer is exposed and developed, with the remaining metal acting as a mask. The thin photoresist layer may be stripped any time after the metal is etched. An array is produced in which regions above and closely around the detectors are uncovered, and regions on the read-out conductors are uncovered. Bonding leads may be applied to the read-out conductors in their exposed regions.

Abstract: Two embodiments of a Stirling cooler are shown. Each embodiment includes usual compressor portion and cold finger portion. The compressor is improved by inserting a vibration damper in the master piston rod by employing a unique evacuating-charging valve, and be inserting an in-line filter in the cryogen passageway between compressor and cold finger. The cold finger is improved by lining the inside of the displacer-regenerator piston with a highly reflective coating and by inserting a good heat conducting spring between the end of the piston and the opposite wall of the cold finger expansion chamber. In one embodiment, the drive for the compressor crankshaft is improved by using herringbone reduction gears with the layer gear counterbalanced and by using a torsional drive shaft between the electric drive motor and the small herringbone gear. The other embodiment uses direct torsion-shaft drive of the crankshaft, but with a counterbalance on the crankshaft in the form of a weight on a flexible arm.

Abstract: A scrubber system for removal and recovery of mercury from plated solid substrates comprising a solution of an alkali metal and ammonium dichromate or chromate salts and nitric acid, said salts and acid being in a weight ratio of about 0.2 to 200. A process for removing mercury from cartridge casings and live ammunition utilizing the oxidative scrubber system is also disclosed.

Abstract: An acceleration resistant crystal resonator is made from a single quartz te that is optically twinned into a left-handed (LH) quartz portion and a right-handed (RH) quartz portion. According to the method, the optically twinned single quartz plate is formed into a resonator plate wherein the effective thickness of the (LH) portion is substantially the same as the effective thickness of the (RH) portion. The resonator plate is then mounted and bonded to the support structure of a crystal resonator enclosure. A pair of electrodes is then deposited onto the (LH) portion and a pair of electrodes deposited onto the (RH) portion. The thickness of the two pairs of electrodes is then adjusted so that the resonant frequency of the resonator on the (LH) portion is substantially the same as the resonant frequency of the resonator on the (RH) portion. The pairs of electrodes are then interconnected to each other and to an oscillator circuit so that in-phase vibration of the two portions is assured.

Abstract: A mortar fire control system for indicating azimuth, elevation and cant alar orientations of a mortar barrel. The system comprises a 3-axis optical head mounted adjacent the mortar barrel which emits light pulses in two predetermined directions, 90.degree. apart, towards aiming stakes. Two aiming stakes located at approximately 50 meters and 100 meters from the mortar are aligned along one of the predetermined directions while a third aiming stake is situated 90.degree. away from the first two aiming stakes and at a distance of approximately 50 meters from the mortar. Each of the aiming stakes is provided with an optical transponder for receiving the light pulses emitted from the optical head and for retransmitting a light pulse to said optical head. The light pulses received by the optical head are converted into digital information representative of the azimuth, elevation and cant angular orientations of the mortar barrel relative to predetermined initial values of each of these three parameters.

Abstract: There is disclosed a process for the nitration of cellulose with nitric acid in the absence of sulfuric acid which comprises adding sufficient nitric oxide and oxygen or air to the nitration reaction mixture to react with the water formed in the reaction. This regenerates nitric acid which can be recycled to the reaction or removed and collected.

Abstract: A light weight armor for combat vehicles, having at least three laminations f which at least the two outermost have the same mass, but with all having significantly differing densities and thicknesses.

Abstract: A modified thermal viewer and method of operating same for detecting and tially analyzing a cloud for the presence of certain chemical compounds, whereby the cloud is viewed through two or more band-pass filters independently and consecutively with each filter responsive to a different band of spectral radiation characteristic of the particular chemical agent of concern.

Abstract: A Z-transfer device transfers rounds of ammunition between laterally misaned feeding and receiving apparatus by permitting the rounds to slide laterally with respect to each other while remaining parallel. Each round is retained in a bucket which is permitted to slide on a shaft with respect to adjacent buckets and each bucket is guided in a Z-shaped path between in-bearing and off-bearing apparatus.

Abstract: An air deflector is provided for the air inlet means of a fuze ogive. The flector comprises a stationary deflecting surface which is configured so as to substantially reduce the amount of air entering the ogive during high velocity flight, while not substantially reducing the air inflow during relatively low velocity flight.

Abstract: A disconnectable tube-to-tube coupling that includes a locking collar arred to span two radially-projecting rings carried by end fittings on the tubes. A special cam-like depresser sleeve is slidably arranged on the collar to move one of the rings into a groove in its end fitting, thereby breaking the coupling connection. The sleeve is operated by mechanical or manual force applied in the axial direction.

Abstract: A composite/laminated window for electron-beam guns is comprised of a first aterial of a polyester film, a second material of a low-Z metal selected from the low-Z metals consisting of aluminum, beryllium, and titanium in intimate contact with the polyester film, and a plurality of fluid cooled, spaced apart foil support members for supporting and cooling the composite window. The metal layer provides for heat transmission of the heat deposited in the metal layer and the polyester film by the electron beam. The polyester film which has 3 to 4 times the strength of the metal layer provides the strength and transmission required for a window operating in a vacuum on the electron gun side and a high pressure on the laser cavity side when the electron beam gun is employed as the source of electrons to produce ionization in the laser cavity.

Abstract: A column of infrared detectors are repetitively optically scanned across an nfrared scene. The outputs of the detectors are fed to a viewing matrix of light emitters consisting of a plurality of columns of detectors, each column having light emitters corresponding to respective detectors. As the detectors are scanned across the scene, successive columns of detectors are energized or enabled such that the light emitted by the individual emitters is directly related to the infrared radiation falling on a corresponding detector. The image may thus be directly viewed by an observer. An alternate system employs a storage matrix having light detectors corresponding to the emitters of the viewing matrix such that the output of the viewing matrix, instead of being directly viewed, is stored and is then read out in a normal television raster to provide a video signal for distant television viewing.

Abstract: A method for fabricating an impervious fiberglass blanket having a plural of spaced-apart slots on its inner side, such as for overlaying and venting a pressurized helicopter rotor spar, includes the steps of positioning a thin metal forming grid of spaced-apart strips, corresponding to the desired slots, on a forming table over a sacrificial layer of peelable material. Sheets of resin-impregnated fiberglass material are positioned over the grid, another sacrificial layer is applied, and a flat caul plate is placed over the lay-up. The laid-up assembly is placed in a vacuum bag, the bag is evacuated, and the assembly is cured in an autoclave. The sacrificial layers protect the blanket from mold release and outside contamination.