Abstract: A fluid dispersal device utilizes the Karman Vortex street phenomenon to cyclically oscillate a fluid stream before issuing the stream in a desired flow pattern. A chamber includes an inlet and outlet with an obstacle or island disposed therebetween to establish the vortex street. The vortex street causes the stream to be cyclically swept transversely of its flow direction in a manner largely determined by the size and shape of the obstacle relative to the inlet and outlet, the spacing between the obstacle and the outlet, the outlet area, and the Reynolds number of the stream.

Abstract: A combined artists paintbox and a liquid container, comprising a tray for housing the paints and brushes and a sealable liquid container hinged thereto. The liquid container is pivotable from an open position, providing access to the paints in the tray, to a closed position covering the open side of the tray. A separate liquid container is provided which can be supported by the tray or sealable liquid container when in their open position and which is used to hold the liquid poured from the sealable container. The separate liquid container is also made to fit over the tray and sealable liquid container to hold them in a closed position.

Abstract: An identifier circuit for connection between a telephone system party line and a party line subscriber to permit identification of a calling party line subscriber with automatic number identifying equipment at a central office.

Abstract: Amplitude and phase jitter can be individually or simultaneously viewed and immediately quantified on an oscilloscope by alternately applying both jitter signals to the vertical (or horizontal) deflection plates at a prescribed chopping frequency and applying the chopping signal to the horizontal (or vertical) deflection plates. The chopping signal frequency should be sufficiently greater than the bandwidth of the jitter signals to permit proper sampling. The resulting display is two spaced vertical (or horizontal) lines, the lengths of which represent instantaneous amplitude and phase jitter, respectively. Another embodiment alternately applies one of the jitter signals to the vertical plates while grounding the horizontal plates and applies the other jitter signal to the horizontal plates while grounding the vertical plates, the alternation being effected at a chopping frequency which is sufficiently high to permit proper sampling of the jitter signals.

Abstract: A dispensing pump having no check valves includes upper and lower mechanically-joined pistons which are moveable together through respective upper and lower cylinders. As the pistons are moved in one direction toward a rest position the cylinders are initially pressure-isolated and the upper piston aspirates spray liquid into the upper cylinder while the lower piston aspirates air into the lower cylinder. Before reaching the rest position the pistons unblock flow communication between the cylinders to permit liquid from the upper cylinder to fall into the lower cylinder. During movement of the pistons in the opposite direction the cylinders are again pressure-isolated and the lower piston forces liquid from the lower cylinder through a spray outlet under high pressure.

Abstract: A board game portrays the trials, tribulations, and triumphs of an intern and is played on a board simulating a large teaching hospital. There are a plurality of major specialty departments and each player represents the intern from one department. At the start of the game each intern has plural patients in the Emergency Room awaiting admission to the specialty ward. The object of the game is for the intern to admit all of his patients by landing on appropriate patient spaces while traversing a path on the board and then diagnose and dispose of the patient by the use of diagnostic and treatment cards accumulated during the game. Disposition may involve treating the patient within the intern's own department, or transferring the patient to another intern's service where the illness could better be treated.

Abstract: A high speed printing head comprises a circular array of stylii drivers for printing characters in a dot matrix format. Each driver includes a permanent magnet and bucking coil electromagnet which when energized causes a stylus to impact a printing surface. The stylus is carried on the end of an arm supported by crossed horizontal and vertical supporting flexures at its other end whereby the arm pivots about a virtual axis lying near the plane of the working air gap of the electromagnet to reduce wear of the pole piece and armature and increase impact rebound of the arm. The magnetic structure and arm structure intersect only above the pole piece reducing flux leakage and size and weight of the structure. The arm and flexure structures are non-magnetic except at said region of intersection to reduce, in conjunction with the single region of intersection of said structures, cross-talk between adjacent drivers.

Abstract: The gain of an operational amplifier is switched between +K dB and -K dB by switching circuit positions of the input and feedback impedances. The gain is changed in 0.1 dB steps by changing either the input or feedback impedance by a ratio of 1.0116 for each step. The gain is changed in 1.0 dB steps by changing the other of the feedback or input impedance by a ratio of 1.122 for each step. A novel two-pole switching arrangement employs the foregoing techniques to permit unambiguous gain polarity changes.

Abstract: A method for guiding slip-forms in the casting of concrete structures where use is made of a rigid slip-form which is repeatedly lifted first at that side of the concrete structure being cast from which the slip-form is to be guided away, such that the slip-form when being lifted is shifted towards the opposite side where, in subsequent operations, it is repeatedly lifted to the same level as it was previously caused to occupy at the side from which the slip-form is to be guided away.

Abstract: The invention relates to a method for casting of concrete structures by means of moulds disposed at two opposite sides of the structure to be cast. The moulds are pressed against the concrete structure by the legs of a yoke construction which is arranged to be successively lifted by jacks cooperating with jack rods. The legs of the yoke construction are caused during lifting to slide directly or indirectly against the jack rods which are positioned between the legs of the yoke construction and the moulds.

Abstract: Apparatus for sifting heavy supporting structures relative to stationary load carrying structures comprises a plurality of parallel jack rods secured to the load carrying structure. A plurality of climbing jacks adapted to operatively engage the jack rods are secured to the heavy supporting structure. The arrangement is such that the heavy supporting structure is shifted relative to the load carrying structure when the climbing jacks are operated and advance along the jack rods while the load carrying structure remains stationary. The reactive forces caused by the operation of the climbing jacks is transferred to the load carrying structure by the jack rods. A method for shifting heavy supporting structures is also disclosed.

Abstract: In a process for forming an extremely hard-wearing rubber or bearing surface on a metal machine part, particles of hard grit, such as carbide grit, are deliberately formed into the surface using a resiliently-loaded tool, so that the surface becomes permanently impregnated with the hard particles. During the operation the particles can conveniently be contained in a slurry that flows over the surface. After impregnation, a lapping operation is performed on the impregnated surface using a fine carbide grit.

Abstract: A personal care spray device, particularly suitable for use as a facial cleanser and massager, is connected to a faucet and issues a cyclically swept liquid jet against the user's body. A guard wall surrounds the jet outlet opening to prevent splashing and serve a wiping function.

Abstract: A hydraulic turbulence amplifier is provided for measuring and controlling the temperature of a liquid supplied to the power nozzle of the amplifier, i.e., the working fluid. As a result of the high pressures at which the laminar-to-turbulence flow transition occurs power applications without additional amplification is feasible. A crossover capability for the output of two sensor-amplifiers operated at different values of supply pressure enables temperature or pressure control systems to be provided.

Abstract: An auxiliary aerodynamic or hydrodynamic control assembly is provided for a vehicle, such as a guided missile, travelling in a fluid medium, which assembly comprises a number of, say three, control surfaces each carried at the inner end of an arm that is mounted at its outer end on a pivot situated at or near the periphery of a housing of circular cross section, the arm pivots being spaced equidistantly around said periphery. In its neutral or undeflected position each arm extends radially inward from the respective pivot and the control surface it carries, which is generally in the form of a circular arc centered on the pivot, lies retracted wholly within the housing. Angular movement of each arm about its pivot in one direction or the other causes one or the other half of the respective control surface to project from the housing. Different combinations of movement of the several control surfaces give rise to moments in roll, pitch or yaw.

Abstract: A small-article receiving hopper is mounted on the upper surface of an inclined support and is rotated by connection with the drive shaft of a motor projecting through the support. The disk-like bottom of the hopper is undercut to form a circumferential series of radial and angularly spaced article receiving slots with the innermost end of the slots in overlying relation with respect to an outlet opening formed in the support. A centralized electrical control means controls operation of a selected motor hopper of a plurality of motors, each associated with a different hopper for dispensing different drugs. The motor of the selected hopper is rotated until a desired number of pills is dispensed and is then stopped.

Abstract: In a multi-channel mobile radio telephone system with multiple base stations covering different geographical areas, mobiles may move freely from area to area and automatically originate and receive calls to and from a land-switched telephone network by direct dialing to and from anywhere in the system by means of a Roving Mobile Call System (RMCS). Mobile subscribers operating out of range of their home base stations (where they are registered for billing purposes) may originate any class of call via any base station in the system and be billed by the home base station by means of intercommunicating base stations in a Roving Mobile Ticketing System (RMTS). Provision is made for tariff sharing as necessary by participating stations. All call signalling and central signalling is performed out-of-band. Call signalling from any base station to mobiles is common to all radio channels transmitted by that station.

Abstract: A tennis trainer includes a generally L-shaped arm having a ball holder at one end and pivotally engaged to a support at the other. Impact against the ball in a direction axially along the ball-supporting section of the arm is initially absorbed by a resilient section of the other section of the arm. A housing on the support includes a slot through which the arm extends and a rotatable cylinder to which the arm is secured. Bias springs oppose rotation of the cylinder and hence the arm. The housing is mountable upside down to permit the trainer to be used for back hand practice or for left handed fore hand practice. Various bending of the arm and vertical positioning of the support permits the ball to be positioned at various heights and positions.

Abstract: A variable flow air outlet valve is provided, e.g. for admitting conditioned air to an aircraft cockpit, comprising two relatively rotatable parts relative rotation of which progressively varies the length of the path that the air must follow through the valve before reaching the outlet so that the outlet flow is changed due to change in the amount of viscous drag the air is subjected to inside the valve. In this way change in the outlet flow is achieved without noise-producing turbulence. The path for the air within the valve extends through varying lengths of a body of foraminous material such as a reticulated foam material.

Abstract: The invention provides a d.c. motor and motor control circuit to conduct characterization tests on materials by applying constant loads to or affecting constant displacements of physical samples of various materials for transient tests purposes. The actuator, a voice coil motor, and a wave shaping input circuit in associated motor control circuitry provide stable, precise control of load during creep tests without backlash and stick slip and stable precise control of displacement during a relaxation test without dither thus providing rapid response whereby results may be obtained in milliseconds and further permitting the same equipment to be employed for dynamic tests. The motor is controlled by an underdamped servo loop which in turn receives a command signal from a filter circuit having a rise time optimized with respect to the mechanical constants of the system.