Abstract: The present invention consists in a rear image projection apparatus having a transmissive screen of high efficiency and low moire disturbance. In particular, the screen comprises a Fresnel sheet having a Fresnel lens, a front sheet having a horizontally-diffusing lenticular lens and a light diffusing element, and if necessary, a third sheet, wherein at least one surface of the Fresnel sheet or the third sheet is formed with a vertically-diffusing lenticular lens, and a pitch of the Fresnel lens is set to be at most 150% of an effective diffusion width of the diffusion element.

Abstract: A prism assembly for a single light valve, full-color projector is disclosed. The prism assembly is adapted to polarize and separate the white illumination light into the three primary colors. Three separate input images corresponding to the information for the red, green and blue components of the full image are applied to separate regions of the light valve photoresponsive layer. The prism assembly comprises three channels, one for each of the primary colors. Each channel polarizes the illumination light into P-polarized colored light which is reflected onto the region of the light valve corresponding to the respective input image. The illumination light in each channel is reflected by the respective region of the light valve as respective beams each including an image bearing component of one polarization state and a second beam component of the opposite polarization state.

Abstract: A height gauge has a touch signal probe provided on a slider vertically movably supported on a support for the purpose of measuring the dimensions or the like of an object by bringing the probe into contact with the object. A rack is formed on the support, and a driving shaft is disposed on the slider, the driving shaft having a pinion engaged with the rack. To the driving shaft are secured a pulley to which the turning force from a motor is transmitted and a control wheel for manually rotating the driving shaft. A clutch member is interposed between the pulley and the control wheel. When the clutch member is engaged with the pulley, the slider is automatically moved up and down, while when the clutch member is engaged with the control wheel, the slider can be manually moved up and down. The height gauge further includes a control circuit which stops the drive of the motor when the touch signal probe generates a touch signal and which holds the indication of a measured value being displayed at that time.

Abstract: An adapting device is provided including a dead center with a cylindrical body and a live center with a tubular body, both of the centers including tapered center defining noses. A pair of yokes are adapted to secure the centers to V-blocks of a V-block instrument with their axes coincident with one another. A live center useful for adapting a V-block gauging instrument into a bench-center instrument is provided having a tubular body with a centering member slidably received therein. The centering member includes a neck portion extending through a reduced diameter opening in the tubular body. A spring biases the member so as to engage a piece to orient it for taking measurements, and a cam member pivots about the neck portion to retract the member when a piece is being mounted. A locking member is provided having a metal screw with a hex opening therein and a thumb grip secured over the screw head. An opening is provided in the thumb grip to allow access to the hex opening.

Abstract: Apparatus and method for setting knife blade depth. The apparatus comprises a magnification device and a removable tray in operative engagement with a digital micrometer. The method comprises the steps of positioning the edge of the knife holder flush with a fixed vertical plane extending through a reticle axis within the magnification device, zeroing the micrometer, rotating the micrometer handle until the tray and edge of the knife holder have moved a predetermined distance away from the fixed plane, and adjusting the knife blade until the edge of the knife blade is flush with the fixed plane.

Abstract: A device for indicating windspeed and direction to a parachutist and comprising a datum element for plummetting to the ground, a status element having a parachute for floating to the ground, a cord linking the two elements, and different markers on each element.

Abstract: A programming aid device for aiding in the interpretation of collimated fields of data in a computer printout. The device includes an inscribed data record which is in a format which corresponds to the collimated fields of the computer printout. When the device is positioned in association with a single row of the computer printout and properly aligned, the data record identifies the data fields of the computer printout. Eyecatcher data is provided in the data record to match up with identical eyecatcher data in the selected row of the computer printout to aid in the alignment of the data record with the selected row of the computer printout. The device also includes an information section for interpreting data in the selected row of the computer printout in accordance with designator data associated with predetermined fields of the data record.

Abstract: A dynamic feeler head comprising a central feeler pin and suitable particularly for being used in machine tools and measuring units in workshops, has definite tilting axes in the coordinate directions x and y and is subject to definite tilting forces, and ensures well reproducible measuring movements. The feeler pin 2 is tiltable in the coordinate directions x or y about axes, which extend in a common horizontal plane and are spaced from the pin always by the same distance. The tilting axes are embodied by hinges made of leaf springs, by which five plates extending one above the other are connected to each at their side edges.

Abstract: A service tool for a valve and visual low pressure indicating assembly for a pressurized container and particularly of a type adapted for operative association with a pneumatic vehicle tire, while being applicable generally to other containers enclosing a fluid under pressure. The pressure indicating valve and assembly serves as means for insertion, or removal, of fluid under pressure from the container, but further, and of substantial significance, serves to externally visually indicate a condition of low or diminished fluid pressure within a tire or other container. The new pressure indicating valve assembly constitutes a replacement for known valve structures and, due to an entirely different construction and operation, creates a need for the tool structure of the present invention, to implement and facilitate servicing of the novel pressure indicating valve structure assembly.

Abstract: The present invention provides an apparatus for centering an object within a housing. The apparatus comprises first and second spaced apart adjustable jaw arrangements aligned in the housing, an adjustment for adjusting the opening and closing of the jaw arrangements and first and second connecting members for connecting the first and second jaw arrangements respectively to the adjustment in a manner such that a single adjustment provides substantially simultaneous and corresponding adjustment of each of the first and second jaw arrangements.

Abstract: A tubular sight gauge with improved high pressure sealing characteristics comprising a conventional pyrex tube held in a gauge housing wherein each end is sealed by use of a stainless steel tube ring that concentrically sleeves around the glass tube with an internal shoulder that rests, on one side, directly against an abrupt change in internal diameter of the end openings in the gauge housing and has an O-ring on the other side of said shoulder and wherein each end of the glass tube is held within the opening by tube spacers (e.g., concentric plastic deformable spacers) such as to limit longitudinal movement (e.g., to approximately 1/16 inch). Such a tubular sight gauge exhibits the ability to maintain a hydraulic seal at pressures approaching 8,000 psi.

Abstract: The invention relates to a method and apparatus for determining the position of the center of a circular object. The object has a known diameter and is placed on a preferably flat surface. A sensor for indicating presence of an object proximate it is moved over the surface in a predetermined path comprising a number of line portions extending over the surface. The greatest distance between two adjacent line portions being less than the radius of the object. The position of the sensor in the path is measured at two points where the line portion intersects the outer contour of an object. The center of the object is determined on the basis of the two points.

Abstract: An automatic testing apparatus is proposed for testing the circular spacing of gears and, in a further development, for simultaneously testing the deviations in gear concentricity, tooth thickness and tooth gap. The testing of circular spacing is accomplished in only one revolution simultaneously for both the right and left tooth flanks of the gear, and the measurement values thus obtained can be used as well for ascertaining the deviations in gear concentricity, tooth thickness and tooth gaps.

Abstract: A device which simulates the burning of an elongated smoking product such as a cigarette, for testing the combustability of an article. The device includes a rod-shaped resistive heating element, the length and cross section of which are the same as those of the product whose burning characteristics are to be simulated. The heating element may be divided into a plurality of longitudinally aligned heat insulated segments. A plurality of lead wires are successively spaced along the length of the heating element so as to respectively uniformly heat the respective portions of the heating element between the adjacent lead wires when an electric current is applied separately thereto. Circuitry is provided for applying an electric current to successively adjacent portions of the heating element through the lead wires for predetermined periods of time, beginning at one end of the heating element and ending at the other, thereby simulating the burning of a cigarette.

Abstract: The thermometer mouthpiece device is for slidably and releasably engaging a thermometer for oral use. The mouthpiece device is for releasably holding a thermometer at a predetermined location so that the positioning of the device in the mouth of a user results in the proper extension of the thermometer bulb into the mouth cavity. The mouthpiece device is aerodynamic in construction to facilitate breathing by a user, and the device is resilient in composition to engage the teeth or gums of a user and to prevent breakage or fear of breakage of the thermometer. The aerodynamic mouthpiece device is comprised of a unitary, elongated and resilient body member having opposing tapered end portions. A ribbed center portion is circumferentially disposed about the device body intermediate the opposing tapered ends. A thermometer holding and securing means is provided to slidably engage a thermometer.

Abstract: An improved archery bow sight comprising a frame, a forward and a rear sighting element movably mounted to the frame and a mechanism for simultaneously positioning the sighting elements along any one of a plurality of sighting lines originating at the operator's eye to enable the operator to maintain his sighting eye at one position while aiming the bow at any one of a plurality of ranges. The sight further comprises a range indicator and a range adjustment trigger that may be actuated by the operator while the bow is drawn.