Abstract: A pump/heat exchanger assembly has tubes with double walls, inner and outer respectively, the outer wall being provided with inner longitudinal grooves. The exchange occurs between a primary fluid circulating outside the said tubes and a secondary fluid circulating inside the said tubes. A plurality of the double-walled tubes are arranged in an annular space, each tube consisting of a plurality of interconnected tube sections, having horizontal curved portions and elbowed portions, the tube sections being joined together at the elbowed portions. At least one leakproof annular chamber is provided outside the annular space and connected thereto. Leaks in the said tubes, are detected by injecting an inert gas, under a given pressure, into the said annular chambers, and comparing the pressure of the gas in the chamber with a maximum and a minimum pressure.

Abstract: A method of producng magnetic head-carrying platforms for supporting one or more integrated transducers arranged on an insulative base and having electrical output strips and an insulating protective member covering the transducer and the output strips provides for joining of the protective member to a substrate with the output strips disposed between the substrate and the member. The surface is treated to expose the ends of the strips which extend beyond the treated surface such that connections to the ends of the output strips may be made by superimposed conductive layers deposited on the treated surface of the substrate. In the fabricated platforms some transducers are in partial alignment in a common plane parallel to the axis of the conductive layers so that at least one output strip of those transducers in partial alignment may be connected by a common output conductive connector.

Abstract: A method and apparatus for air scouring a layered filter bed wherein the air is dispersed into the finer particles of the bed without disturbing the coarse large aggregate in the lower portion of the bed to prevent inter-mixing of the fine aggregate with the large aggregate. The filter support generally comprises a corrugated filter support forming channels having peaks to provide air channels for distribution of air into air ducts communicating with the fine particles of the filter bed. The valleys between the peaks provide an area for the coarse large aggregate of the filter bed such that the filtered liquid flows through the upper portion of the bed and into the large aggregate and out outlet apertures in the filter support into the lower portion of the channels formed by the filter support.

Abstract: A circuit for digitizing data represented by a variable electric current includes a capacitor to which a variable direct current is applied, and a reference stage defining two voltage levels and producing a control signal when the voltage across the capacitor reaches one of the two levels. The control signal causes the charge on the capacitor to be changed by a known amount. The number of charge pulses is counted and added to the instantaneous value of the capacitor voltage.

Abstract: A localized-field static magnetizing device consists of a non-magnetic substrate having a magnetic layer thereon that contains a succession of adjoining zones of alternately differing lengths and having magnetic inductions of alternately opposing directions. One of the lengths is much greater than the other and the magnetic layer has a high coercive field.

Abstract: The present invention provides apparatus for converting digital electrical signals representative of alpha-numeric characters and other symbols into a particular pattern of dots symbolic of the character or symbol as used, for example, in the Braille alphabet. The dot pattern is established by the tips of a plurality of stems which are raised and retracted in respect of a given surface by operation of electromagnetically response plunger cores slidably positioned in cavities which communicate with wells within which the stems slide. The ends of the cores within the cavities are bevelled. When a core is retracted from the cavity, the associated stem falls by gravity to its retracted position and is maintained in position with its end slightly spaced from the extreme bottom of the cavity by a stop member.

Abstract: A mold for polystyrene has two spaced dies receiving the polystyrene therebetween. The wall of each die has two superposed independent chambers, one a heating chamber and the other a cooling chamber adjacent the die surface. Passages from the heating chamber pass through the cooling chamber and through the die surface and do not communicate with the cooling chamber. The opening of the passages in the die surface may be partially closed by nozzles.

Abstract: A d.c. gas discharge display panel consists of a rectangular array of discharge cells suitable for displaying alphanumeric characters surrounded by a circular array. The two arrays share one common set of conductors and are addressed sequentially by reducing the potential on the common conductors in turn by a glow transfer device extending around the circular array. The other conductors of the circular array may be commoned to result in a radial pointer whose position around the rectangular array can be changed.

Abstract: A liquid crystal film placed between plate electrodes and point electrodes can have a first optical state 1 if the electrical excitation applied between the plate and point electrodes is higher than a threshold value V.sub.s and a second optical state 0 of this excitation is lower than the threshold value. A set of P voltages is applied to the P point connections of the device and a second set of S voltages is applied simultaneously to the S sector connections. In a boundary sector, some points of the liquid crystal are thus in state 1 while other points are in state 0. In the case of each of the other sectors, the points of any one sector are all in one of the two states 1 or 0.

Abstract: A continuous process and apparatus for randomly coloring a pile fabric material includes pretreating the fabric to be dyed with a wetting agent, conveying the pretreated fabric continuously through a series of operating stations including a gum applicator for application of a viscous gum coating and thereafter to a roll dye applicator for application of a first dye color which penetrates the gum coating prior to being set. The first dye color is of a relatively low viscosity, much lower than that of the gum, to allow said dye color to overrun the tips of the yarn. The tips of the yarn remain relatively undyed by the first dye color which settles mostly at the lower base position of the carpet yarn.For application of additional dye colors, additional successive dye applicators may be used. In such event the dye colors applied are different viscosities. The first applied dye color is preferably of a viscosity greater than that of the second applied dye color and may be included within the gum.

Abstract: To reduce the proportion of rejects resulting by reasons of short circuits in the manufacture and use of miniaturized multilayer circuits and to improve the electric efficiency, there is inserted between each conductive layer of low resistance and each insulating layer of high thermal stability, a very thin layer of a conductive material, preferably non-magnetic, of high resistivity and of crystallographic reference at least compatible with respect to the first conducting material and of low or negligible thermal expansion in the range of temperatures to which the circuits are submitted both during manufacture and use.

Abstract: Metalloplastic flexible annular joint, wherein it comprises a first metal ring constituted by an inner metal spring with contiguous turns closed on itself and surrounding said spring, at least one metal envelope in which is embedded the spring, said envelope being extended by two parallel planar faces which extend in a transverse equatorial plane of symmetry of the joint, said faces having flared extensions moving away from said plane at a predetermined distance from the spring to partly surround a second solid elastomer plastic ring which is coaxial to the spring in such a way as to create between the two rings a sealed enclosure of limited volume which can be used for controlling the sealing of the joint.

Abstract: A method for preparation of the final film used for engraving a flat screen, belt screen or rotary screen for a printing machine. The final film is prepared from a photograph of the image to be reproduced and engraved by known techniques on a screen so as to provide a continuous repetitive pattern on the face of a pile fabric dyed in a continuous print dyeing process.Select areas of photographic images are montaged and put into a repeat pattern within a predetermined outline to establish the basic repeat. Four continuous tone color separations are made of the selected pattern to provide yellow, blue, red and black continuous tone negatives which represent the four colors of the original image. Each color separation is posterized and half toned to provide eight positive films. The films are selectively combined, blown up to the desired repeat size to provide a negative or positive which is used to prepare a flat bed screen or rotary screen for an otherwise conventional printing process.

Abstract: Data processing apparatus includes a storage circuit or memory, and an addressing circuit for identifying word locations within the storage circuit or memory into and from which a plurality of information items are to be written and read, respectively. A translating circuit is provided for successively shifting, in a write mode of operation, at least a portion of each information item so that it is stored in the storage circuit in a manner that the stored information item in each word location has a bit order different from that order of any other information item as stored in the storage circuit. In a read mode of operation, the translating or de-skewing circuit shifts the information items as read out from the storage circuit in a direction opposite to that imparted during the writing mode.

Abstract: Heat exchanger integrated into the main vessel of a molten combustible salt reactor comprising a reactor skirt containing the active core, a main vessel surrounding the reactor skirt, pumps and primary exchangers, an outer vessel which doubles the main vessel, a thermostatic coolant between the main and outer vessels maintaining the main vessel wall at a temperature below the melting temperature of a crust of salt which is inactive from a nuclear standpoint and which forms a coating of solid salt protecting the inner surface of said main vessel, wherein the calories are extracted from the core by means of autonomous heat transfer modules each comprising a primary exchanger and a pump, whereby each module is suspended in the intermediate space between the main vessel and the reactor skirt and supported by a bearing surface whose base is located on a cooperating bearing surface provided around an opening made in the wall of a supporting ferrule fixed close to the bottom of the reactor skirt and over the entire

Abstract: A process and apparatus for the automatic correction of the focusing of a microscope in an image plane utilizes two microscope outputs forming two images of the same object in two different planes surrounding the image plane and two matrices with at least one line of N photodetectors receiving the two images. A contrast measuring circuit of each image is associated with each matrix and a comparator of the signals is used for the two contrast measuring circuits. Connected to the output of the comparator is a circuit for the formation of a correction signal and the microscope is focused by the correction signal.

Abstract: A gas discharge display panel has a glow transfer device extending along one or both edges of the panel and consisting of a row, or rows, of cavities extra to the display. One electrode of the, or each, transfer device is common to the conductor associated with the display cavities at that coordinate and the other electrode is grouped with others in threes to a transfer conductor so that three-phase addressing of the transfer conductors causes a transfer glow to move along from cavity to cavity. The transfer glow changes the potential of said common conductor to enable discharges to form in the associated display cavities suitably addressed by potentials applied to selected ones of their other conductors. One transfer device can be used for writing and the other, a short time later, for erasing, thereby providing a variable brightness display.

Abstract: Pumping ejector having a fixed tubular ejector body passing through the wall of a protective cell. In its part which projects into the cell this body has an extension provided with a first lateral connection for the admission of a pumping steam flow, a second lateral connection connected to a pipe for admitting a fluid to be pumped and an axial diffuser for the outflow of said fluid shaped in convergent-divergent manner and fitted into the body behind the diffuser. It also comprises a tube having an intake opening for the steam flow introduced into the body by the first connection and has at its end facing the diffuser a nozzle for accelerating the steam for the entrainment of the fluid to be pumped.

Abstract: There is provided a reader for reading information magnetically coded on a carrier. The reader includes a magnetizing device for magnetizing the information precoded on the carrier and a transducer for detecting the magnetized information as the carrier is translated successively past the magnetizer and transducer. The magnetizer includes at least one magnetic layer having a succession of adjoining zones, the length of alternate zones being much greater than the length of the other zones and the magnetic induction in the zones being of opposite sense. The transducer includes at least one magneto-resistive detecting member and a magneto-resistive compensating member which are of anisotropic magnetic material. The members are disposed to develop across the compensating member a voltage in response to the interference magnetic field which is equal to that developed across the detecting member due to that field.

Abstract: Randomly dyed skeins of yarn are produced in an apparatus which comprises an open vat adapted to be filled with a liquid dye bath and having rack means for supporting a plurality of skeins of yarn which are to be randomly dyed. The rack means includes valved conduits to control the flow of dye therethrough. Further valve means are provided for selectively adjusting the level of the liquid dye bath relative to the skeins supported in the dye bath while maintaining the liquor ratio, i.e., the ratio of liquid dye bath to yarn dyed, constant and as low as practical.