Abstract: A disposable pH monitor electrode electrolyte cartridge is disclosed that is quickly and easily attached to a probe base to make up a pH monitor electrode assembly. The cartridge contains an electrolyte confined by membranes that are pierced by a probe tip protruding from the probe base when the cartridge is assembled thereto.

Abstract: A recording head protective overlay arrangement with an alarm capability is provided. The protective overlay is continuously replenishable between the recording surface of the recording head and the recording medium and is movable in a direction opposite to that of the recording medium so as to provide a cleaning function as well as a wear-preventive function. A dispenser cartridge housing the protective overlay is provided which is specially designed to closely conform to the recording head. A pivotable cartridge holder is included for enabling the cartridge to be inserted in a position remote from the recording head and pivotable into an operative position with the recording head. The tape medium itself and various components operatively associated therewith are pivotably mounted, to provide movement of the medium into intimate operative contact with the overlay and the recording head.

Abstract: Magnetographic printing apparatus includes relatively movable component supports which provide for ready access to a magnetizable recording medium when in an access position and desirably limited length travel path, when in an operative position, for a visual image recording medium adapted to receive a toner-developed image from the recording medium. One such component support is a substrate supporting selective image-producing components for collective movement between access and operative positions and defining a portion of the visual image recording medium travel path. The remaining portion of such path is defined by components fixedly supported for registry with such movable component support in such operative position.

Abstract: Improved recording head structures having lower recording current requirements and planar construction which are mass-producible with high reliability. Associated with the conductors constituting the recording elements are one or more selected materials, predeterminably situated, for substantially reducing the reluctance of the magnetic writing circuit associated to the conductor recording zone. The material is arranged to at least partially define the recording zones and to shield the recording medium from the magnetic fields associated to the recording elements outside of the recording zones. Through appropriate choice and placement of such material, a pre-biasing effect may be achieved thus enabling further reduction in recording currents.

Abstract: A method for making a direction sensitive contrast enhancement filter for a shadow mask color cathode ray tube is disclosed to minimize the amplitude of moire interference patterns to unnoticeable or unobjectionable levels. For a particular color cathode ray tube phosphor dot size, the light transmission through a direction sensitive enhancement filter having a given hole size and spacing is determined mathematically. The filter is then moved a number of fixed increments with respect to the phosphor dot and the light transmission is determined for each incremented position. The variation in light transmission as the filter is moved incrementally across the phosphor dot is the data recorded. This procedure is repeated for different hole sizes and different hole spacings and the data graphed to find the minimum light transmission variation. At this minimum light transmission variation moire patterns are reduced to unnoticeable or unobjectional levels.

Abstract: A moving map display used on an aircraft or other moving vehicle is disclosed. Discreet map segments are stored on a video signal storage means and portions of the video signals for several map segments are read from the storage means and combined to create a composite map segment which is displayed within the aircraft or other moving vehicle. A navigation system on the vehicle provides position information to a microprocessor which functions with other circuitry to determine which map segment portions are to be combined to create the composite map segment.

Abstract: Apparatus is provided for uniformly premagnetizing magnetic media, such as wide magnetic tapes and/or for substantially uniformly orienting the magnetic particles in the slurry of the magnetizable layer of magnetic media during their formation. Premagnetization constitutes magnetizing the medium in a preselected direction, such as the transverse direction (i.e., perpendicular to the intended direction of movement of the recording medium past a recording head but in the plane of the medium), prior to magnetically recording information thereon. The apparatus comprises a number of predeterminably arranged small magnets disposed proximate to the medium which obviates the need for large, expensive, heavy magnets and magnet systems. A continuous transverse saturation level of magnetization is provided in the medium with virtually no vertical or longitudinal magnetic components or anomalous effects.

Abstract: Magnetographic printing, method and apparatus are used to generate letter-quality, relatively high speed transfer of magnetic toner particles from a magnetic tape to paper. A pretransfer force (f.sub.1) holding the toner to the tape is established which may be magnetic, or both magnetic and electrostatic in nature. The transfer operation employs relatively high speed approaching movement of the tape toward the paper in a controlled manner such that forces (f.sub.2) exerted on the toner particles due to the rapidly closing movement including forces created by air currents are collectively less than the toner-holding force (f.sub.1) for any instantaneous separation between the tape and paper. The operation may include the use of a bias voltage to generate a component of the electrostatic holding force and the use of a corotron to deposit electrostatic charge on the magnetic toner particles.

Abstract: An apparatus and method are disclosed for electrostatically separating a first medium such as a magnetic tape from a second medium such as paper following transfer of images from the tape to the paper. The apparatus includes a movable member or platen disposed for moving the tape into contact with and away from the paper, and a voltage source coupled across predetermined portions of the tape and platen. The method includes the step of creating an electrostatic force between the tape and platen sufficient to overcome adherence of the tape to the paper during contact of the tape with the paper, facilitating separation of the tape from the paper as the platen is moved away from the paper following image transfer. Separation is accomplished substantially independent of tape tension.

Abstract: A method of fabricating from a single piece of copper foil the extremely fragile recording element structure of a multi-channel magnetic recording head having a linear array of bi-metal recording elements, in which the elements are comprised of elongated substantially parallel finger portions terminating in a common return, with each having a minutely thinned down recording zone. For high resolution recording head structures, the dimensions of the elements at the recording zone may typically be as thin as 0.1.times.10.sup.-3 inches with a width of 1.5.times.10.sup.-3 inches and length of 3.5.times.10.sup.-3 inches, where the total length of the recording elements may nevertheless be as long as three inches. The process comprises an etching technique and the application of one or more supports at appropriate times in the fabrication to protect the structure at its most vulnerable times.

Abstract: A Loran-C navigation receiver is disclosed wherein digital circuitry and a microprocessor is used to automatically identify Loran transmitting stations and makes standard hyberbolic navigation measurements. The receiver operator manually enters a group repetition rate into the apparatus being operated. Initially, the receiver receives and analyzes all received signals until signals from a master and secondary station are received regularly at the stored group repetition rate. The apparatus then changes to a fine search mode in which the exact time of receipt of the master and secondary station signals is determined; the phase code of the received signals is checked to determine if the received signal is a ground or sky wave, and a determination is made if there is a deflective secondary station blink code.

Abstract: A method for self calibration of a LORAN-C navigation receiver utilizing a microprocessor is disclosed wherein the time difference of signal arrival of master station pulse trains from a LORAN-C chain selected by group repetition interval (GRI) information input to the receiver becomes a frequency standard to which the output of an oscillator and counter internal to the receiver is compared to determine frequency error. The error is interpolated over each GRI and a correction factor is added or subtracted to each count output of the counter used to make time difference of signal arrival measurements.

Abstract: An associative processor for searching data stored in memory to identify messages or other data containing operator selected keywords containing alpha-numeric or other characters is disclosed. The identified messages or other data are then transferred from the memory to an output device for review. The processor comprises a plurality of commercially available integrated circuit random access memories (RAMs) for performing processing functions. The binary words read out of the RAMs are applied via a register to the higher order addressing inputs of the same RAMs without any processing. Messages being searched for keywords are applied to the lower order addressing inputs of the same RAMs. A binary word applied to the higher order addressing inputs of the RAM memory selects a block of memory bits with each bit being associated with a different character.

Abstract: A Loran-C receiver cycle detector is disclosed which processes Loran-C signal pulses on a cycle-by-cycle basis of the carrier frequency and generates an output for a specific carrier cycle. Due to received noise, sampling techniques are used to create a histogram which is analyzed to provide feedback used to accurately locate a tracking point on each Loran-C pulse.

Abstract: A hydraulic control system particularly suitable for controlling the acceleration and velocity of a load such as the plunger of die casting equipment is described. The load is controlled by a hydraulic ram which in turn is controlled by a main valve of the kind in which the rate of flow of fluid to the load is directly proportional to the rate of flow of pilot fluid thereto. Pilot fluid flows through an auxiliary valve and a restrictor. The restrictor is adjusted to determine the maximum rate of flow and the rate at which the auxiliary valve opens is adjusted to determine the rate of change of flow.

Abstract: A display employing a horizontal and vertical grid of parallel infrared light beams in front of a cathode ray tube (CRT) face wherein a finger or other object may be placed against the face of the CRT to mark a spot thereon and the spot so marked will be detected by the interrupted beams. Infrared sources and detectors are located around the periphery of the CRT face and operate in different planes to more closely follow the curvature of the CRT face and thereby minimize parallax errors.

Abstract: A slot antenna capable of relatively broad bandwidth operation is disclosed that may be used for wide angle scanning in phased arrays. By shorting the feed element to the slot radiator at multiple points, the relatively broad bandwidth operation is achieved.

Abstract: A circuit for controlling the switching of a high-power diode microwave switch with a relatively low-power diode switching circuit by utilizing a high-power quadrature hybrid coupler in the switch with the switch input and diode switching element being connected to one leg of the coupler, the output of the switch being connected to a second leg of the coupler, the third and fourth legs of the coupler being capacitively grounded to provide an a-c short at RF frequencies and thereby reflect microwave energy back into the switch, and a switch control circuit being connected to the third leg of the coupler. The coupler divides the power input to the switch so only a portion thereof is incident on the diode switch control circuit, and thus provides isolation between the control circuit and the switch input and output.

Abstract: A method and apparatus are provided for sorting signals from compressive receivers in accordance with the type of modulation on the signal, so as to be able to establish the identity of the signal short of fully demodulating it. It has been found that signals from a compressive receiver which are insufficiently sampled for complete demodulation can be identified by "histograms" in which each designated condition, such as the number of consecutive 1's or 0's is graphed against the number of occurrences of this designated condition over a period of time, designated a "data collection interval." The result is a pattern or diagram which is characteristic of the modulation type, such that FSK, DFSK, PSK, hand morse, machine morse, anomolous morse, AM, SSB, and multitones can be distinguished one from another. Moreover, it is possible to recognize two-way voice communication.