Abstract: Apparatus is disclosed for feeding an inoculating or nucleating agent or particle to a trough of a pipe casting apparatus or beneath the surface of molten metal within a ladle. In particular, the agents are introduced by a hopper into a sealed chamber by selectively actuatable valves. A gas compatible with the agent to be used in the casting process, is introduced into the sealed chamber, whereby a relatively low pressure is established therein. An agent feeder, such as a vibratory feeder, is provided for directing a measured charge of the agent into a funnel leading to an outlet conduit. The pressure established within the chamber forces the agent through the conduit which is in turn connected to a delivery tube by which the agent is used to coat the mold surface directly or is fed into a stream of metal in a centrifugal tube casting apparatus. An outlet valve in the outlet tube is provided for selectively permitting the passage of the agent and gas mixture to the casting apparatus.

Abstract: A servo control system comprising, in a feedback loop, means for providing an error signal representing the difference between desired and actual conditions of a controlled system, and means responsive to said error signal to produce a control signal for the controlled system; the control system also comprising means for injecting a predetermined disturbance signal into the loop, and means responsive to a comparison of said disturbance signal and a loop response signal for varying gain in said loop.

Abstract: In the improved supply circuit, provision is made for a "start-up" storage tank placed at a higher level than the heat exchanger and connected to a secondary circuit in portion of this latter which is located between the solar engine and the feed pump and includes the evaporator. The storage tank is equipped with heating means for bringing the fluid contained therein to a temperature which is lower than the temperature of the fluid within the evaporator.

Abstract: The amplifier comprises at least two amplifier units or transistors T.sub.1 and T.sub.2 of complementary types. The base of the first transistor T.sub.1 is connected to a control current supply line. The emitter of the transistor T.sub.1 is connected on the one hand to one end of the load impedance and on the other hand to the base of the second transistor T.sub.2. The collector of the transistor T.sub.1 is connected to a voltage supply of suitable polarity. The emitter of the transistor T.sub.2 is connected to the current supply line and the collector of said transistor is connected to another end of the load impedance.

Abstract: A composite vending control circuit is disclosed that is readily disposable in either a single-priced or multi-priced configuration. The composite vending circuit includes the circuit elements and interconnecting conductors required for operation in either a single- or multi-priced mode of operation. Further, a switching arrangement in the form of interconnectable plugs permit reconnection of the circuit elements whereby the single-priced circuit configuration may be readily adapted to operate in a multi-priced configuration. Thus, conversion may be readily achieved without extensive rewiring or the addition of further circuit elements.

Abstract: Weighing of each control rod and at least the moving portion of the control rod drive mechanism is carried out in continuous operation by means of an assembly comprising at least one strain gage mounted in a circuit for measuring the electrical resistance of the gage according to the change in length which is a function of the weight being measured.

Abstract: The invention relates to a tube assembly for use in isotopic separation diffusers. Each tube assembly is secured at each end to an end-plate and comprises a number of filter tubes assembled by fitting together adjacent ends which are provided with inter-fitting spigots having a diameter greater than that of the body of the tube. The assembled tubes are connected together in bundles by means of resilient means located at the level of the spigots so that the tubes make contact with each other via the abutting spigots.

Abstract: A timing signal generating device operates in response to angular displacement of a rotating shaft. The shaft has a disc provided with a reference mark and a plurality of timing marks apart from one another in a circumferential direction. A first detector is located adjacent to the disc to detect the reference mark and to reset a shift register. A second detector is also located adjacent to the disc to generate timing pulses in response to the timing marks and supply the pulses to the shift register. Each of plural logic gates has two input terminals each of which is connected to an output of a predetermined step of the shift register, so that an output signal outputted from each logic gate to the corresponding driving circuit for an operating device constitutes a timing signal carrying information including starting and terminating times of operation.

Abstract: A vacuum enclosure rests on two parts to be seam-welded by the electron-beam welding technique and surrounds a support for an electron gun. The support is made up of two separable elements, the first element being constituted by a frame applied in vacuum-tight manner against the parts to be welded by means of a seal fitted on one face, the other face being applied against a flange of the second element which forms a bell-housing and is applied against the frame.

Abstract: A matching network for distributing high frequency bi-directional signals transmitted along a coaxial transmission line includes a transformer and an active filter having a second order transfer function for coupling a transmitter or a receiver to the transmission line. A comparator comprising trigger-connected differential amplifiers converts the output of the filter to bi-directional signals.

Abstract: A drawing table has a drawing board with a telescopic arm slidably mounted on a rail secured to the board. The telescopic arm has a base sliding on the rail and the other end of the telescopic arm supports a drawing set. The telescopic arm includes braking means provided by magnetic strips arranged along each telescoping member of the arm with magnets fixed to the members facing the magnetic strips.

Abstract: A device for sorting and separating coins has a track with an increasing width between the feed point for the coins and the exit point for the coins.

Abstract: An electron irradiator for supplying electrons to the human body includes a discharging pole for application to the body and a power transformer connected to a D.C. source via an interrupter, the secondary of the power transformer being connected to the discharging pole via a condenser which charges and discharges at the repetition rate of the interrupter whereby the electron space discharge of the discharging pole, when applied to the human body, supplies electrons to the body.

Abstract: This invention relates to a timing unit for detachable mounting upon a conventional telephone instrument, having for its purpose the measuring of a predetermined time cycle and the emission of a signal, or a succession of time-spaced signals, when overtime charges are accumulating or are about to begin.

Abstract: The casing is made up of a number of identical compartments of prismatic shape in which are placed vertically either one or a number of fuel element bundles which are not secured to the casing, the casing walls being provided with means for guiding control rods, supplying emergency coolant and positioning measuring devices. At least some of the casing walls are constituted by two parallel thin metal sheets welded at intervals to stiffening webs which extend between the two metal sheets to the full height of the casing and parallel to the axis of the reactor.

Abstract: A pneumatic drive device for a probe, more particularly for an eddy current measuring probe has a tight flexible tube in which the probe is movably mounted with a cable connected to the probe. A cable pushing and pulling device is connected to one end of the flexible tube and a compressed fluid is introduced into the flexible tube for driving the probe towards and then into the tube to be checked. A tight connection for the other end of the flexible tube to the tube to be checked is provided including a cylinder-piston-restoring spring assembly engaging the drive device beneath a tube to be checked and then disengaging the drive device from the tube which has been checked.

Abstract: A football lineman trainer has a frame supported on runners between which rollers are positioned for control through foot pedals by an operator on the frame to vary the resistance to movement of the trainer as linemen contact individual pad units which can be set and locked in low, high and intermediate positions or can be moved from and into such positions by the operator through a foot pedal assembly so as to teach different techniques for both defensive and offensive linemen with the pad units being separately adjustable from straight up to approximately 30.degree. leaning positions with such positions being sustained at the various low or high placements and movements of the pad units which are designed for face blocking as well as shoulder blocking.

Abstract: The anchoring device of the invention is one which buries itself vertically nto the water bed material. In its common form the anchoring device is of generally cylindrical form and includes a centrally located suction passageway and fluidizing water outlets located in the general region of the lower open end of the suction passageway whereby in use and with suction applied to the suction passageway and fluidizing water made available through the fluidizing water outlets the bed material from immediately beneath the anchoring device is pumped through the body of the anchoring device and discharged above it.

Abstract: A communication system for communicating between a central control unit and a plurality of controlled units, all interconnected by a single communication channel, wherein communication is time multiplexed with control words being transmitted in each direction during each time interval allocated to each separate controlled unit. The control words are transmitted during half-cycles of a periodic clock signal of one polarity, while data from the controlled units may be transmitted to the central control unit only during half-cycles of the periodic signal of the opposite polarity.

Abstract: Memory device including an input circuit adapted to provide signal pulses to be applied to an IC counter so that they are counted by the counter. Auxiliary power source is provided to supply the power circuit in the counter to maintain the memory therein despite interruption of power supply. A set-and-reset type flip-flop circuit is provided between the input circuit and the counter in such a manner that the signal pulses are applied directly to one of the set and reset terminals and through an inverter to the other of the terminals. The arrangement is effective to prevent counting error which may be experienced during interruption of power supply.