Abstract: A phase modulation modem providing switch selectable speeds on voice-band channels utilizes four phase, modified eight phase, and optimized eight phase, two amplitude modulation techniques. A binary equalizer automatically corrects for envelope delay and amplitude distortion of the carrier signal caused by the voice-band channel. Each symbol time, the X-axis error and Y-axis error for the received symbol is determined by comparing the received X and Y components with stored ideal X and Y components for that symbol. These error X and error Y values are used to modify primary and secondary equalization constants. The equalization constants, thus modified during this symbol time, are used on the next received symbol to correct for the phase and amplitude distortion measured during past symbol times. This sequence is repeated for each symbol time. Preselected equalization constants are utilized on the first symbol received.

Abstract: An oscillating sprinkler wherein a body structure carries a discharge nozzle and an oscillating mechanism which effects turning of the body structure in small increments. A control mechanism reverses the direction of movement of the body structure causing the body structure to move back and forth through a preselected arc. The body structure fixedly supports a metal pin on which the oscillating mechanism is journelled. The oscillating mechanism fixedly supports a metal pin in axial alignment with the metal pin on the body structure and the oscillating mechanism pivots on the end of the pin journelled into it with one end of the pin carried by the oscillating mechanism acting as a bearing surface.The pin carrried by the oscillating mechanism is journelled in a support plate that fastens to the body structure. One end of a spring member is attached to the portion of the oscillating mechanism pin that extends through the support plate.

Abstract: A color encoding or dichroic filter for video transmission and method of making the same is provided. The color encoding filter can be used with a vidicon tube to provide color signals for video transmission. The filter comprises a substantially transparent substrate, such as glass, having a plurality of grid patterns superimposed thereon with each pattern individually or in conjunction with an overlapping grid pattern capable of transmitting a predetermined bandwidth of energy. A substantially transparent filler material is utilized to complete the filter structure. The filler material is substantially transparent to the desired transmitted bandwidth of energy and is further optically complementary to the filter material of each individual grid pattern to minimize any refractive scattering of transmitted energy. The filler material also provides both a planar exterior surface to the filter and further permits the filter material of the overlapping grid patterns to be maintained with a constant thickness.

Abstract: The present invention comprises an apparatus for inkless fingerprinting directly on a medium, such as a check. The apparatus can include a stamp housing having a replaceable cartridge with a pair of reservoir resilient foam cell pads having a semi-sealed surface. One of the pads will contain a liquid developer solution, for example, a water soluble inorganic compound; while the other pad will contain a liquid reagent solution, for example, a water soluble inorganic compound which can react with the liquid developer solution to deposit a non-soluble colorant precipitate. Advantageously, the liquid developer solution will include a carrier solvent that is relatively non-evaporative over the life of the applicator, and has a viscosity value that permits the liquid developer solution to be deposited on a porous medium surface and maintain a coating having only sufficient thickness above the medium surface to contact and adhere to substantially only the ridge pattern of a finger.

Abstract: The present invention provides a cover assembly for an exhaust muffler and tail pipe to reduce noise and eliminate corrosion. The cover assembly is advantageously formed from a pair of molded rigid fiber glass shells that can be fastened together about both the exhaust pipe and the muffler. Sandwiched about the muffler and exhaust pipe shells are layers of asbestos and spun glass. The shell itself is a combination of a fire retardant resin and fiber glass. The exhaust covering is particularly valuable in diesel exhaust systems for trucks.

Abstract: An apparatus for analyzing the performance of wheeled, land vehicle brake systems is described wherein means are provided for driving the vehicle wheels at a predetermined speed and the operator or computer controlled brake actuator selectively applies the brakes in a series of simple successive steps comprising the test sequence. The pedal force, or other actuating force, the brake effort exerted by each wheel, and the imbalance between the braking effort of opposite wheels is measured and recorded on a strip chart or fed to a computer, to determine if the measured values fall outside of a predetermined range of values representing acceptable deviations from standard values. Any deviation of the brake effort from the acceptable values, or excessive imbalance between opposite wheels at any point in the test sequence, may be used as a basis for diagnosing and identifying a specific brake malfunction. The system can be enlarged to simultaneously test the brakes on all wheels of a land vehicle.

Abstract: A high pressure wall of water is directed at a surface to be cleaned from a plastic-type discharger tube having nozzles mounted therein. The discharge tube is joined at right angles to a plastic-type inlet tube. The inlet tube connects to a garden hose through a convenient valve and coupling arrangement. The discharge tube has caster-type wheels mounted thereto approximately midway between the union of the discharge tube and inlet tube and the respective ends of the discharge tube.

Abstract: A mounting member for an extractor hold down apparatus permits the extractor to exert both extraction and insertion forces at different angles to, for example, an electronic unit on an avionic rack. The mounting member is provided with a pair of elongated slots that accommodate a cross bar and retaining disks mounted on the power shaft of the extractor. The slots provide an angle range of at least 18.degree. plus or minus 15.degree..

Abstract: A four element lens system for use on a camera and the like comprises two positive meniscus lens having two negative meniscus lens interposed between the positive lens. The optical axis of each lens elements being aligned with an aperture stopper element or its functional equivalent between the negative lens elements. The position of the effective plane of the aperture stopper satisfying the following equation: ##EQU1## wherein S is a distance along the optical axis between lens elements, S'.sub.2, is the distance between the surface of the second negative meniscus lens and the effective plane of the aperture stopper and S".sub.2 is the distance between the effective plane of the aperture stopper and the surface of the third negative meniscus lens. Preferably each of the lens elements is injection molded from a plastic material with both of the positive lens elements and the negative lens elements being identical lens.

Abstract: An image forming optical system, such as a photographic objective lens assembly is provided with a movable optical element. The movable optical element is designed and mounted so that it can optically interact with the transmission rays of the optical system or permit the rays to pass unaffected. The optical element can be a filter capable of improving the image forming characteristics of target object image to provide an advantageous soft focus, for example, as a portrait lens system or to provide a soft defocussed image. The optical filter element can have a central region capable of passing the converging or diverging transmitted rays through the optical system substantially free of refraction and a peripheral region capable of decreasing the transmitted image point intensity of rays transmitted therethrough. The optical filter element can be movable along the optical axis within a predetermined range of movement.

Abstract: A blower is mounted in an enclosure; having a first opening covered by a filter media and a second opening; in such a way that the rotating axis of its blower wheel, or rotor, is: (a) located at or near the vertical midway point between the top and bottom of the enclosure, or duct, in which the blower is mounted, and (b) angularly displaced from the usual horizontal orientation (i.e., horizontal axis of rotation of the blower) by a substantial angle, preferably 15.degree. to 75.degree..

Abstract: A double layered optical low pass filter is provided for use in a color video system for monitoring an object scene. The optical filter is designed to optically complement a dichroic stripe filter to prevent the introduction of spurious signals by any interference between luminance and chrominance signals, while at the same time providing a transmittance of high spatial frequency luminance signal to permit an improved image resolution. The optical low pass filter includes a first phase retarding filter layer designed to provide a first spatial frequency response across the visual spectrum and a second phase retarding filter layer designed to provide a second spatial frequency response across the visual spectrum.

Abstract: An extremely wide angle or fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/4 for use with a compact single lens reflex camera. The fish eye lens system includes a first lens group of four lenses on the object side of a diaphragm and a second lens group of at least three lenses on the image side of the diaphragm. From the object to image side, the first lens group includes a pair of negative lenses, a cemented doublet and a positive fourth lens having a convex surface on the image side adjacent a concave surface of the cemented doublet. The second lens group includes a pair of cemented doublets as two of the three lenses.

Abstract: The present invention is directed to a storage tray and waste container, and particularly, to a novel storage tray for holding crackers and a wrapper container mounted on the storage tray. The storage tray, or holder member, has a peripheral wall, and a central locking device for removably securing an upstanding waste container. The locking device can comprise scallop-shaped fastening ears on the surface of the tray that are capable of interlocking with peripheral detents on the bottom of the waste container. The top of the waste container further has a pair of spring-biased closure members. The closure member can be formed with a pair of integral pivot pins for pivotal connection with the waste container walls and a pair of punched slits on the surface of the closure member to receive a band spring that can bias the closure member to a closed position.Another embodiment of the present invention includes a waste container that can be hooked, or attached, to the side of a storage container, such as a basket.

Abstract: Disclosed is an automatic data communication system having communicating modems equipped with automatic equalizers. The equalizers respond to a first long equalization sequence automatically transmitted from another modem. In response to that long equalization sequence, the equalizer starts from a preset non-equalized condition and assumes a fully equalized condition. That equalized modem is also capable of automatically transmitting its own long equalization sequence to the other modem. Thereafter, second short equalization sequences are employed at the receiving modems to enable a memory storage associated with the automatic equalizers. The memory stores, in response to the long equalization sequence, signals which are indicative of the fully equalized condition. Accordingly, the equalizers do not have to start from a non-equalized condition for each new data message unless a dramatic distortion occurs.

Abstract: In areas utilizing telephone switching equipment that will only accept dial pulses, a conversion unit, that fits into the space formerly occupied by the dialing mechanism in a standard telephone subscriber's unit, provides touch-pad dialing. The conversion unit accepts input signals, representing digits, from a standard 3 .times. 4 matrix touch-pad at an asynchronous rate and starts out-pulsing at the required pulse repetition rate as soon as the first digit signal is received. During each touch-pad button depression, an audio tone is supplied to the subscriber unit earpiece. The conversion unit provides for programmable toll restriction that permits selective prohibition of out-pulsing at each subscriber unit. At the instant a restricted input signal is received, the conversion unit provides a steady audio tone to the earpiece and stops out-pulsing. To prevent hookswitch dialing, the conversion unit extends the break period of the electronic pulsing switch.

Abstract: Modal test method and apparatus is described for use in automotive engine plants, vehicle inspection stations, diagnostic centers, etc., for quickly, accurately and repeatably measuring the principal air contaminants; i.e., carbon monoxide (CO) and hydrocarbons (HC) in engine exhaust gas emissions. Quantitive measurement of oxides of nitrogen (NO.sub.x) and oxygen (O.sub.2) may also be measured if desired. While O.sub.2 is not an air contaminant, a measure of its concentration in the exhaust gas has diagnostic value. The engines are tested at prescribed modes of operation (usually three; high cruise, low cruise and idle) at which emission-related engine malfunctions, if they exist, are most likely to be exposed. CO and HC (NO.sub.x and O.sub.2 if desired) evaluations are made at each test mode and may be recorded on a "report card." The measured test values of the air contaminants are compared at each test mode with prescribed permissible values either automatically or manually.

Abstract: A calibration system produces a calibrating signal having an adjustable amplitude, a torque force representative of that amplitude is directly applied to a meridian seeking gyroscope unit that hangs from a suspension band. Prior to each use of the instrument, the signal amplitude is adjusted so the gyroscope unit assumes a predetermined null position. The torque force is applied to the gyroscope unit by inductive field interaction of the first, second, and third coils. A control signal representative of the displacement of the gyroscope unit from the null position is applied to the third coil, which is fixed relative to the null position. The calibrating signal is applied to the first coil, which is also fixed relative to the null position. The axis of the first and third coils are both in an approximately perpendicular relationship to a vertical axis.

Abstract: An optical non-invasive oximeter for measuring oxygen saturation in arterial blood utilizes a light source capable of giving off light having different wavelengths, such as light in the infrared and red region, and a pair of photoelectric devices, one responding to one wavelength and the other to the other wavelength, for detecting the amount of such light transmitted through living tissue. Each photoelectric device is connected to a computing circuit which generates a signal that represents the logarithm of the quotient of the signal received from the photoelectric device divided by its direct current component. The signals from each of the computing circuits are differentiated and then divided, one by the other, to provide an indication of oxygen saturation in the blood.

Abstract: An apparatus for analyzing the performance of wheeled, land vehicle brake systems is described wherein means are provided for driving the vehicle wheels at a predetermined speed and the operator or computer controlled brake actuator selectively applies the brakes in a series of simple successive steps comprising the test sequence. The pedal force, or other actuating force, the brake effort exerted by each wheel, and the imbalance between the braking effort of opposite wheels is measured and recorded on a strip chart or fed to a computer, to determine if the measured values fall outside of a predetermined range of values representing acceptable deviations from standard values. Any deviation of the brake effort from the acceptable values, or excessive imbalance between opposite wheels at any point in the test sequence, may be used as a basis for diagnosing and identifying a specific brake malfunction. The system can be enlarged to simultaneously test the brakes on all wheels of a land vehicle.