Abstract: Means and method for harnessing inertial forces so as to suppress rebound-resonance resulting from abruptly stopping a moving body. The inertial forces are generated by a movable mass yieldably and resistently coupled to the moving body. The movable mass maintains its motion when the body is abruptly stopped and the inertial forces coupled to the moving body are out of phase with the rebound reaction forces generated when the movement of the body itself is halted.

Abstract: A microwave oscillator/amplifier includes a plurality of TEM transmission lines each with a negative resistance device at one end and a lossy, matched termination at the other end. A resonant cavity is coupled to each TEM line so as to induce a parallel resonance on the lines at the region of coupling. Structural means are provided for maintaining the characteristic impedance of the TEM lines uniform along the length of said lines. Fabrication of a device in which the TEM line characteristic impedance was uniformly maintained along the line length at five times the optimum negative resistance of said negative resistance device is noted. Suggested levels of characteristic impedance are relatively low compared to prior art devices, none of which are known to attempt maintenance of characteristic impedance uniform along the length of the TEM transmission line.

Abstract: A spare tire bracket lock is provided to prevent the theft of a spare tire from a pick-up truck or a similar vehicle of the type wherein the spare tire is stored beneath the undercarriage of the vehicle. The spare tire is supported by an elongated mounting bracket, which bracket is in turn supported by a pair of bolts secured to the undercarriage of the vehicle. A nut engages the lower portion of one of the bolts for removably securing the bracket thereto. The nut includes a flange having an eye for receiving the shackle of a padlock. The spare tire bracket lock includes a lipped portion which is slid over one edge of the bracket, the flange of the nut being simultaneously slid through a slot in the spare tire bracket lock. Positioned adjacent opposite faces of the flange are locking members having holes aligned with the eye of the flange for allowing the shackle of a padlock to be simultaneously passed through the holes in the locking members and the eye of the flange.

Abstract: A CRT system uses a time delay element in one deflection circuit to enable the production of reentrant Lissajous figures from signals derived from a single source. Its high voltage power supply operates at frequencies beyond the audio range and produces wave forms of low harmonic content at relatively low voltage levels thus providing quiet operation with little or no electromagnetic interference or x-ray emission problems. A secondary deflection yoke acting on the beam before the beam enters the effective region of the primary sweep deflection yoke enables control of the color tone of the image presented. Individual gain and timing controls produce variations in the display to satisfy the whim of the viewer. A gate-controlled blanking signal produces a stroboscopic effect at the display while a second form of intensity modulation produces scintillation of the displayed imagery.

Abstract: A large bore, long stroke, low friction, hydraulic actuator having dual hydrostatic bearings permitting elastic deformation of the piston rod while inhibiting metal to metal contact between either the piston head or the deformed piston rod and the walls of the hydraulic cylinder. The actuator employs a safe and highly reliable metering orifice cushion decelerating means. Piston displacement is constantly monitored by a completely internal, magnetostrictive, sonic delay line displacement measuring means.

Abstract: Method and apparatus for updating system variables in least significant bit increments during the period between the times the data are normally sampled. In this manner, a smooth transition from one data level to another is achieved rather than a choppy transition at sampling iteration rates.

Abstract: An active retrace beam is used to reduce the effects of lag in an image transducer. The retrace beam is defocussed to provide large area, uniform stripping action. After the read-out beam has traced across the photocathode of the image transducer, the active retrace beam is vertically stepped back to an earlier point in the raster field and retrace is initiated. After the active retrace scan, the beam is vertically stepped down to a point one line below the previously read-out scan line and the read-out scan is initiated. A fairly large area of the photocathode receives several overlapping erasure scans by the defocused, active retrace beam each time a field is scanned. Uniform erasure results. Very little time is required, so the invention may be utilized in system demanding minimal retrace times.

Abstract: Two camera models are each viewed by an optical probe such that each optical probe views its respective model with the same perspective. To this end both probes are pointed towards a desired point on their respective model boards. A light beam, characterized by a particular light signature, is emitted from the desired point on each board and passed to a detector by the probe associated with that board. Detection is on an array of photosensitive elements arranged such that the X-Y coordinates of the point of impingement of the beam on the array may be determined. The location of each light beam on each detector array is correlated. The pointing of the probes is then adjusted such that when each light beam falls on the same X-Y location on the respective photosensitive element arrays, the optical probes are pointing in the same relative direction and viewing both scale models with the same perspective.

Abstract: A capacitive load is charged through a series transistor. Peak charge currents for the load are drawn from a capacitive source whose charge is constantly maintained. Rapid discharge of the capacitive load is through a semiconductor diode and a cascade of transistors which act as switching elements. Diodes across the base-emitter junction of these switching diodes provide protection against transient damage as well as reducing the time required to cut-off conduction of the transistors. A simple transistor TTL drive (+5v) operates the switch.

Abstract: Apparatus and method for simulating "light-on-skids" maneuver of a skid-equipped helicopter by treating the aircraft as having four landing struts.

Abstract: A polarizing-key insertion tool for facilitating insertion of polarizing keys into backplate and card bin printed circuit board connectors is disclosed.

Abstract: A cinematographic film system which employs film having a motion picture sequence recorded thereon with at least one intervening frame between recorded frames. A second motion picture sequence is recorded on uniformly spaced intervening frames. The film is projected using a film transport operating to advance the film in multiple frame steps equal to the spacing of the frames in said motion picture sequences. The film transport is adjustable to permit, on signal, a single one-frame advance and thus shift the film from one to the other of said motion picture sequences. In a vehicle simulator, the film and projector coact to impart considerable flexibility to film-based visual display systems.

Abstract: In a digital data link system which transmits and receives frequency-shift keyed digital data over mark/space frequency channels, the invention enhances system performance in the presence of noise. The method utilizes two synchronization channels, selecting the better one to synchronize the receiver to the transmitter. The method teaches the accumulation of the results of a plurality of data-state determining measurements and the utilization of the accumulated measurements made during a baud interval to resolve the received mark/space frequency signal into a corresponding mark/space data-state signal. Apparatus to practice the method is described. The apparatus includes a timing recovery circuit for synchronization-channel selection and a digital frequency detector capable of extracting information from a data signal in the presence of noise having the same frequency as the data signal and up to 86.6% of the amplitude of the data signal.

Abstract: Scheimpflug correction is achieved by maintaining Scheimpflug relay lenses at a fixed tilt angle with respect to the axis of the lens system and revolving pairs of said relay lenses about said system axis. The present disclosure revolutionizes previous concepts of how Scheimpflug correction may be achieved, permits the use of less complex lens structures of fewer elements, eliminates the problem of image displacement and reduces to relative simplicity the mechanical drive requirements of the movable elements while totally eliminating the need to translate lenses to compensate for lens tilt angle adjustments.

Abstract: A novel variable resistive network is disclosed enabling the control of an odd number of signals wherein a selected one of said signals is held at a common reference level while others of said signals are varied in amplitude such that no one signal reaches a maximum input level amplitude at the same time as any other of said signals. Method and apparatus for achieving a color presentation from a video signal which may have no color content of its own is taught employing said variable resistive network for Hue control and using dual-input amplifiers having a weighted gate signal for Saturation control.

Abstract: A means of simulating loss of peripheral vision and the eventual total black-out experienced by a pilot, undergoing high acceleration forces while maneuvering an aircraft is disclosed. The simulation is achieved by modifying the pilot's helmet by incorporating thereon a variable optical device which when excited causes a reduction of pilot vision. The reduction in vision is progressive, in direct proportion to the level of excitation applied, which excitation itself is directly proportional to the acceleration forces simulated.