Abstract: Disclosed is the physical construction and electrical control circuit of a fault indicator designed to provide a watertight structure for the indicator. One face of the indicator is visible through the sealing apparatus, the sealing apparatus enclosing the structure on all sides other than the indicator face side. The indicator is capable of being submerged and will withstand a water pressure of 8 psig to meet specifications established by electric utilities. The electrical control circuit normally causes the transformer to operate below its saturation level resulting in quick response to changes in input current, and providing improved temperature stability of the control circuit.

Abstract: A method of and apparatus for determining when an unknown quantity is within a desired range of a reference quantity. The apparatus includes a dual slope integrator which integrates the reference quantity and the unknown quantity and discharges the resultant integrated levels. By integrating the reference quantity at least once and the unknown quantity at least twice for three different time periods which differ from one another by amounts which are proportional to the desired range, a comparison of the discharge times of the resultant integrated levels will provide an indication of whether the unknown quantity is within the desired range, when the desired range is a percentage of the value of the reference quantity.

Abstract: A spherical sector is fastened to the front faces of a soft-iron magnetic yoke of the magnet of a sensor probe used for thickness measurement. The spherical sector, which is the probe tip, is a ground half ball-bearing electrically welded to a flat plate at the end of a threaded shaft. A titanium carbide layer of spherical angle of approximately 60.degree. is deposited on the wear side of the spherical sector by gaseous diffusion in a range of approximately 4 - 6 .mu. in which the deviation of the layer thickness from the mean value is within 1 .mu..

Abstract: Circuit for producing a bias current which is inversely proportional to the common emitter forward gain (h.sub.fe) of a transistor. It includes a first transistor and second and third transistors of opposite conductivity type to the first. The base emitter paths of the second and third transistors are connected in parallel. The first transistor has collector-to-base feedback to regulate its collector current to a prescribed value, which feedback connection is through the emitter-to-collector path of the second transistor. The bias current proportional to the prescribed value divided by the h.sub.fe of the first transistor is provided at the collector of the third transistor.

Abstract: A cathodoluminescent gas discharge device having improved modulation characteristics whereby an electron beam generated by the device is more easily modulated by a small control voltage. The improved gas discharge device includes a cathode for generating a gas discharge to be used as a source of electrons. An electron-transmissive extraction grid is spaced from the cathode and receives an electrical potential for extracting electrons from the gas discharge. An electron-transmissive modulation grid is spaced from the extraction grid and receives a control voltage for modulating the flow of electrons through itself.

Abstract: The IF amplifier combines the high frequency and low noise figure characteristics of a cascode stage with the large signal handling capability and accurate gain control of a direct emitter coupled amplifier controlled by a constant current source. The amplifier uses a technique of alternately stacked cascode stages which results in minimizing both the total current drain and the value of DC potential necessary to operate the amplifier. A current mirror, independent of power supply variation, is used to control the gain of the amplifier and is also used to provide temperature compensation for amplifier gain. Special bias techniques along with the current mirror minimize the variation of the amplifier gain with respect to DC power supply variations. Novel use of semiconductor devices minimizes the number of leadout connections on an I.C. chip needed for attaching large external bypass capacitors.

Abstract: In nuclear magnetic resonance apparatus employing detection channels in phase quadrature an excitation-pulse transmitter includes an arrangement of switches and associated delay lines to enable successive pulses to be produced in phase quadrature and alternate pulses to be produced in phase opposition. The receiver output signals corresponding to the quadrature pulse-pairs may then be processed to cancel the effects of phase error and unequal gain in the detection channels and the signals corresponding to the opposing pulse-pairs may be processed to cancel systematic noise.

Abstract: A variable feedback and tuning capacitor, which is fabricated from a brac with bendable metallic prongs, is attached to the input transmission line of a microwave transistor amplifier. The prongs are placed in close proximity to the collector pad metalization of the carrier and provide a convenient and novel means for RF tuning the amplifier after the transistor is carrier mounted and DC tested.

Abstract: An electro-optic ceramic material useful for electro-optic applications comprising an anti-ferroelectric phase (or para-electric phase) and a ferroelectric phase, the two phases of which coexist having a morphotrophic phase boundary. The scattering of light applied to the ceramic material can be changed by a voltage applied to the ceramic material whereby the anti-ferroelectric phase (or para-electric phase) and the ferroelectric phase are reversibly changed and thus the morphotrophic phase boundary is shifted corresponding to the phase changes.

Abstract: In an ion implantation apparatus, means for forming multiple, separate parallel ion beams, each having a predetermined spot diameter, and means for focusing each of said ion beams upon a predetermined chip area of a target wafer whereby multiple chip areas upon the wafer can be simultaneously implanted with prescribed ion dosages.

Abstract: An electron gun apparatus comprises a cathode subassembly which is movably mounted relative to a fixedly mounted and registered grid/anode subassembly to permit mechanical adjustment of the cathode with respect to the grid/anode subassembly. An evacuated chamber, including resilient bellows interconnecting the movably mounted cathode assembly to the fixedly mounted grid/anode subassembly for permitting the mechanical adjustment, houses the cathode and the grid/anode subassemblies. Means are provided for electrical energization of the cathode, the grid, and the anode. According to a further feature of the invention, the cathode comprises a line filament, and the grid and the anode are slotted for providing an elongated line image.

Abstract: In a floating electrical output circuit according to co-pending application Ser. No. 395,608, now U.S. Pat. No. 3,909,737, issued Sept. 30, 1975, two load terminals are driven from amplifying means having differential current outputs. A differential amplifier connected across the load terminals provides a feedback signal which is compared with the input signal to provide a control signal for the amplifying means.In the present invention the amplifying means are simplified to a single differential current amplifier.

Abstract: A device which provides for uniform driving of a series of microwave trantors connected in parallel in a transistor pellet by utilizing a series of parallel microwave transmission lines of differing widths said widths being selected so as to compensate for the unequal effect of mutual inductance among the bond wires connecting said microwave transmission lines to the transistor pellet.

Abstract: A method for determining the state-of-charge for zinc mercuric oxide type primary cells. I-V curves of the cells are plotted and the nearly constant slopes of these I-V curves above 75mA are measured graphically. These slopes are used to define effective differential DC resistance values (.DELTA.V/.DELTA.I).sub.75mA which have a linear relationship to charge expended, Q(A-h), which is graphically produced by plotting (.DELTA.V/.DELTA.I).sub.75mA versus Q(A-h). This relationship is used as a basis for a state-of-charge indicator to determine the remaining charge to about 12%. One can also subtract the internal resistance of the cell (measured with an a-c bridge technique) from (.DELTA.V/.DELTA.I).sub.75mA and obtain a new parameter, R.sub.p, which is related to the polarization resistance of the cell. The maximum uncertainty can be reduced to less than 10% if the linear curve is produced by plotting polarization resistance R.sub.p of the cell versus the charge expended Q(A-h).

Abstract: In measuring the distance between a measuring sensor and a metallic body, the sensor is comprised by a resonance circuit including a capacitor and a coil, and the sensor is connected to the input of a Q multiplier circuit which is impressed with an AC signal having a predetermined frequency. The non-linear distance-inductance characteristic of the coil is compensated for by adjusting the selectivity of the resonance circuit so that the amplifier included in the Q multiplier circuit produces a linear output. Such compensation is performed by adjusting the gain and/or the amount of positive feedback of the Q multiplier circuit.

Abstract: The device measures electrical charges, an electrical voltage or an electrical current, present between two electrodes of which one is fixed and of which the other is mounted so as to be able to vibrate mechanically. One of the two electrodes is connected to ground. Energizing means apply an AC voltage V.sub.o of frequency f.sub.o between the two electrodes. Means are provided for detecting the amplitude of the mechanical vibrations of frequency f.sub.o of the vibrating electrode and means for measuring this amplitude, which is a function of the parameter to be measured. The means for detecting and measuring the amplitude of the mechanical vibrations is a piezo-electric element subject to these vibrations and an apparatus adapted to measure the AC voltage produced.

Abstract: A novel method and apparatus for achieving electrostatic deflection of high current ion beams within a scanning apparatus. In one embodiment, a pair of gates are provided, with one gate being oriented proximate each side of the deflection plates, and each gate being biased to a negative voltage of a sufficient amplitude to repel electrons which otherwise would be attracted to the positively-biased deflection plates to thereby protect the electron cloud from degradation, and maintain space charge neutralization of the ion beam. In another embodiment, means are provided to drive the deflection plates at negative voltages at all times and to maintain portions of the ground tube of the apparatus adjacent the deflection plates at a ground or negative level in order to avoid degradation of the electron sheath.

Abstract: A printed circuit having a protective coating of lacquer or the like thereover is tested by bringing a plurality of resiliently mounted measuring pins into engagement with certain measuring points on the printed circuit. The printed circuit is then subjected to ultrasonic vibrations to cause the contacting pins to be impacted into good electrical contact with the measuring points on the printed circuit. The pins are resiliently mounted for axial movement in opposed openings in a pair of spaced plates and the plate and pin assembly is capable of being moved toward and away from the printed circuit.

Abstract: A getter device of the annular-ring type having a deflector. The deflector has a conical segment and both axial and radial locating elements. The radial locating element is U-shaped in cross section.

Abstract: Disclosed is a technique for testing electronic storage arrays including bistable storage cells fabricated in accordance with integrated semiconductor technology. Also described is the testing of load devices in a flip flop storage cell which is connected to a pair of bit lines that are inaccessible for the direct application of test signals. Testing is performed by altering the time duration of signals applied to the memory cells under test.