Abstract: A device for indicating differential pressures between first and second pressure sources comprising a housing with a bore and a piston member slidably disposed within the bore and dividing the bore into first and second chambers. The piston member includes a permanent magnet and the housing includes ducts for connecting the first pressure source to the first chamber and the second pressure source to the second chamber whereby the piston member is displaceably responsive to differences in pressure between the first and second pressure sources. The device further comprises indicators in cooperative arrangement with the piston member for indicating at least first and second predetermined differential pressure levels respectively corresponding to respective displacements of the piston member within the bore. The indicators are magnetically coupled to the piston permanent magnet such that they move from non-signalling to signalling positions in response to the respective displacements of the piston member.

Abstract: A device for measuring density and moisture of a material includes a hollow roller rotatably mounted on a shaft for rolling movement on the surface of the material. A radioactive source and density and moisture detectors are supported below the shaft and adjacent to the inner surface of the roller at substantially a fixed distance from the surface of the material being measured as the roller is rolled. The detectors are coupled to a conventional counter and microprocessor circuitry which provide an output reading related to the density or moisture content of the material. The shaft may be mounted for tilting movement so that the roller may pitch in conformity to contours in the material surface.

Abstract: Low cost, easily updated information retrieval apparatus is provided that will provide rapid access to information relating to the probable cause of an apparent or actual process or other machine malfunction signalled by an indicating device, and a recommended action to correct such malfunction.

Abstract: An optical temperature measurement technique that utilizes the decaying luminescent intensity characteristic of a sensor composed of a luminescent material that is excited to luminescence by a light pulse or other periodic or other intermittent source of radiation. The luminescent emissions of a preferred sensor exhibit an approximately exponential decay with time that is the average of a distribution of chemically reproducible crystallites and are repeatable with a high degree of accuracy regardless of excitation level or prior temperature history of the sensor.

Abstract: The invention relates to an arrangement for ultrasonic temperature measurement. The arrangement combines an ultrasonic temperature sensor and an electronic operating circuit. The ultrasonic temperature sensor comprises an acoustic waveguide, a second acoustic wave propagating resonant element, which is exposed to the thermal conditions under measurement, and whose resonant frequency becomes an indication of the temperature, and decoupling means inserted between the waveguide and the resonant element to facilitate high "Q" operation of the sensor. The arrangement utilizes torsional waves if a solid waveguide is employed, or internal surface waves with axial symmetry if a hollow waveguide is employed. The sensor is excited by a pulsed CW source, whose carrier is retuned to the resonant frequency of the sensor, and measured as the indication of temperature. The electronic operating circuitry achieves improved accuracy in temperature measurement as the "Q" of the sensor increases.

Abstract: A liquid level indicator for use in monitoring the level of fluid in a reservoir remote from the user is disclosed. The indicator includes a receiving tube adapted to receive a quantity of fluid having an elevation reflective of the oil in the reservoir. The fluid is then confined by a reciprocating closure tube. A piston member is then depressed into the confined oil pressurizing that oil until an equilibrium position is obtained. The piston head is held in a constant spaced relationship with an indication element which is remote from the fluid reservoir. The amount of displacement of the piston head within the receiving tube is reflected by reference indicia carried by the indication element to indicate the level of fluid within the reservoir.

Abstract: An abnormal noise detector for use in evaluating the quality of automotive gear units or the like is disclosed. The present invention employs a microphone which picks up the noise produced by a gear unit being tested and an adjustable bandpass filter connected to the microphone which passes only those signals from the microphone having a desired frequency, the desired frequency being a function of the rate of rotation of the gear unit. The bandpass filter is controlled by a proportional amplifier responsive to the rate of rotation of the gear unit which at any rate of rotation of the gear unit causes the bandpass filter to pass only the desired frequency. The filtered output from the bandpass filter is applied to an X-Y recorder which automatically plots the sound pressure of the noise having the desired frequency as a function of the rate of rotation of the gear unit or as a function of the desired frequency.

Abstract: A probe generally rocket-like in shape includes a forward leading nose section containing a radio transmitter with an antenna permanently attached thereto which is fixed to a central housing section possessing a generally cross-sectionally square bore followed by a trailing finned section continuing the bore. A motor assembly including an electric motor having opposed shafting (one end of the shaft defines a cutting tool and the opposite end of the shaft defines a plurality of threads) is slideably disposed in a watertight chamber. The motor assembly, retained in a first position by the engagement of the threaded shaft with the body, is biased toward a second position by a compression spring. A sensing array of position sensing switches senses deviations in the descent of the probe in the water. The motor rotates the shaft to disengage the shaft from body in response to the sensed deviations.

Abstract: An over-temperature indicator for freezers includes an indicator pin slidable mounted within a cylindrical housing in which is mounted a bistable bimetal thermostat disk which is engaged by a magnet mounted to an end of the indicator pin. A cup shaped insulator is mounted over a substantial portion of the cylindrical housing to provide a thermal time delay. An over-temperature condition triggers the bistable bimetal disk to snap, causing the magnet to release and enabling gravity to urge the indicator pin into an indicating position.

Abstract: An electrically operated thermometer for a cold storage room is normally supplied with current from the secondary winding of a transformer, the primary winding being connected to a conventional alternating current source. A battery is alternatively connected to the thermometer through a manual switch, which is preferably of the momentary type, which must be held engaged.

Abstract: A disposable maximum reading thermometer comprises a body (40) in which a capillary passage is defined, a reservoir (41) communicating with the passage and a heat expansible indicator medium (46) contained in the reservoir. The reservoir and the passage are adapted to allow expansion of the medium in the passage when the medium is subjected to heating. At least a part of the passage wall exposable to the indicator medium is adapted to undergo a detectable and irreversible change of its light penetration characteristics when brought into contact with the medium. The capillary passage is defined by a rod (48) arranged in a longitudinally extending bore (42) of the body (40). The surface of the rod is frosted (matt) or opalized, preferably by a mechanical treatment, and adapted to be deopalized when brought into contact with the medium.

Abstract: A wind indicator for a sailboat has a wind vane on a vertical shaft which is mechanically coupled with a horizontal shaft turning a pointer. The wind angle relative to the boat is indicated by the pointer on a circular dial. Two windward pointing indicators are mounted from the mast. A reaching wind indicator is mounted at the stern.

Abstract: An automatic apparatus for testing the spacing of gear teeth in a gear wheel is disclosed, in which the spacing testing is performed for both the left and right flanks of the teeth in a single gear revolution, and the switchover or deflection of the two measuring feelers from one flank to the other against fixed stops is avoided, thereby preventing shocks and vibrations in that measuring position that could produce incorrect measurements.

Abstract: A method and apparatus for the non-destructive identification and location of subcoating corrosion on a coated metal surface employing infrared thermography. The apparatus comprises a heat source for directing pulsed infrared radiation onto a test surface; a scanner for scanning the test surface for infrared radiation being emitted therefrom; a detector for capturing said emitted radiation and converting it into a signal representative of the thermal characteristics of the surface; and video display apparatus for visually displaying the signal as a thermal map of the surface. The method comprises the steps irradiating a test surface and detecting temperature differentials that occur on the irradiated surface.

Abstract: A transportable apparatus for testing the tooth flank profile and tooth flank lines (tooth angle) of gear wheels, in particular gear wheels of large diameter. With this apparatus, prior to the measuring operation, the positioning of the apparatus at the gear wheel to be tested can be carried out simultaneously with the aid of an orientation scanner, and the selection of the tooth gaps least associated with error is simultaneously effected by moving the orientation sensor into various tooth gaps in preparation for the measuring operation and with the aid of a computer ascertaining the measured-value deviations from one another of the various tooth gaps that are entered.

Abstract: In a rain gauge of the type comprising a counter-balanced tiltable water collecting spoon system as operating a counter the tiltable spoon system is held in its water collecting position by magnetic attraction forces between a permanent magnet and an armature such that the tilting is initiated in accurate responses to a predetermined overfilling of the spoon system, whereby the tilting takes place in a welldefined and rapid manner conditioning a high measuring accuracy of the rain gauge.

Abstract: A visual enhancement marking arrangement for a receiver aircraft having a body portion and a fuel receiving receptacle on the body portion for receiving the outer end of a refueling boom of a tanker aircraft, the marking arrangement increasing visual and depth perception of an observer in a tanker aircraft and including inner converging runway lines converging toward the fuel receiving receptacle, outer converging runway lines substantially parallel to the inner converging runway lines, substantially parallel comparator lines between the inner converging runway lines spaced apart about the width of the fuel receiving receptacle and in alignment therewith, milestone marker lines perpendicular to the comparator lines and extending between the inner runway lines, gradient density contour lines located on opposite sides of the fuel receiving receptacle, fuel receptacle outline markings, stabilizer vane markings, and danger marking lines delineating critical "do not contact" areas including windscreen outline mark

Abstract: An antenna support is provided by a molded plastic member comprising a block having a vertical passage therein, a horizontal guideway on the top of the block, and detent instrumentalities associated with such guideway. The support is designed for use with a 40 MHz wire rod antenna shaped by multiple "L" bends therein to have a middle section comprising two horizontal arms normal to each other and, at its extremities, two vertical arms normal to the middle section. The support is assembled with the antenna by passing one of the antenna's vertical arms through the vertical passage in the block, and by seating the horizontal antenna arm adjacent that vertical arm into the support guideway so that such horizontal arm is snap-fittably held in that guideway by such detent instrumentalities. Thereafter, the unit consisting of the antenna and its support is assembled with a printed wiring board so that the support maintains the antenna in a predetermined desired positioning thereof relative to the board.

Abstract: A liquid level indicator system is provided for sensing the presence of liquid at a preselected level in a liquid containing container. A piezoelectric reed transducer is disposed in the container for detecting vibrational movement and for producing an electrical signal in response to the vibrational movement. Operationally coupled to the transducer is a paddle which is sized to be immersed in the liquid when the liquid is present at the proper level. Immersion of the paddle in the liquid inhibits the transducer from vibrating due to fluid resistance against the paddle and accordingly inhibits an electrical signal output from the transducer. A control circuit is provided for sensing the electrical signal generation and for generating an alarm signal representative of low liquid level. A tubular housing is provided for containing a level of liquid representative of liquid level in the liquid container. The reed is preferably tuned to a preselected natural frequency sympathetic to ambient system vibrations.

Abstract: An inclinometer includes two coplanar electrodes positioned within a chamber of a metallic housing containing a high relative dielectric constant fluid and a gas. With the inclinometer positioned on a level surface equal areas of the two electrodes are immersed in the dielectric fluid creating two equal capacitors formed by the electrodes and the metallic housing. When the inclinometer is rotated through an inclination angle, unequal areas of the electrodes are immersed in the fluid causing a capacitance differential that is a measure of the inclination angle.