Abstract: A method and apparatus for forming a heated end of a plastic pipe into a bell having a sealing groove therein arranged to receive a seal so that it may be sealingly joined with a plain end of a second pipe inserted therein. The apparatus comprises a mandrel base rigidly secured to a mandrel core having annular grooves formed thereabout communicating with a vacuum source through a passage formed in the core and base. A mandrel shell comprising four separable segments is secured on the core. The mandrel shell has a plurality of apertures formed therein communicating with the annular groove on the core such that a vacuum may be drawn through the apertures. A heated plastic pipe is forced over the mandrel shell until it engages a tapered shoulder formed on the mandrel base, thus forming a seal between the end of the pipe and the base. A vacuum is drawn on the cavity formed between the plastic pipe and the mandrel shell thus drawing the plastic pipe to the shell, forming an annular internal groove in the pipe.

Abstract: In an integrated circuit semiconductor device different matched resistors are provided by at least one resistor comprising at least two matched resistor parts connected together, these resistor parts also being matched to each constituent resistor part of at least one different matched resistor of the device.

Abstract: A heater for heating fluid within a body cavity of an animal say for heating tumours by irrigation, comprises a container having inlet and outlet ports through which fluid in the cavity is passed by an external pump, and a heating element in the container to heat at least some of the fluid that passes through the container. Pumping can be achieved by a fluid filled pipe coupled to the container, either directly by or by way of a diaphragm, and to a bellows or like arrangement for cyclicly varying the pressure of the fluid in the pipe and container.

Abstract: A circuit arrangement at least partially embodied in a collector-diffusion-isolation (CDI) type device, in a semiconductor body comprising a thin layer initially wholly of one conductivity type on a substrate of the same conductivity type, has at least one component comprising a modification of previously known CDI type constructions i.e.

Abstract: A flame sensing system according to the invention makes use of infra-red rays produced by resonant radiation of carbon dioxide in a flame and gives no wrong information due to discharge of thunder or sunlight and has high sensitivity with good S/N ratio. The flame sensing system is characterized in that when a ratio of an output of intensity of a first radiation produced by resonant radiation of carbon dioxide to an output of intensity of a second radiation having a wavelength located in the vicinity of the wavelength of said first radiation in the region of wavelength in which there is little absorption by the carbon dioxide in the air exceeds a predetermined value, difference in intensity between said first radiation and said second radiation is detected either by increasing the output of said first radiation or by decreasing the output of said second radiation thereby to give a warning.

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: The present invention is concerned with a flame sensing system utilizing infra-red rays by resonant radiation of carbon dioxide which system gives no erroneous information due to discharge of thunder, solar light or the like and has high sensitivity and S/N ratio. The flame sensing system according to the invention is characterized in that a flame is detected continuously for a short time in terms of difference in intensity between a first infra-red rays of a first wavelength produced by resonant radiation of carbon dioxide and a second infra-red rays of a wavelength located in the vicinity of said first wavelength in the region of wavelength in which there is little absorption by carbon dioxide in the air and then a warning device is actuated while the intensity of said second infra-red rays remains beyond a predetermined level.

Abstract: A cardiac signal transmitter unit adapted for use by the pacemaker patient which detects and processes electrocardiogram and pacemaker information, and which generates a corresponding audible signal for transmission to a remote location for reception and analysis. The unit employs a three input electrode array for developing a differential signal, has separate channels for processing the electrocardiogram data and the pacemaker data, and includes a fail-safe battery monitor circuit for completely disabling the unit as the battery nears the end of its useful life.

Abstract: A neutron guide constituted by two superposed and separable tubular elements extends from the reactor core to the immediate vicinity of the bottom wall of the reactor vessel directly above a neutron detection chamber located outside the vessel. The upper element containing a neutron-emissive medium comprises a closed tube filled with inert gas and engaged coaxially with the lower element which is positioned within a support sleeve. The lower element is provided with another closed sleeve filled with inert gas and terminating near the internal surface of the bottom of the reactor vessel.

Abstract: A gas discharge laser has a cathode electrode comprising a block of platinum black compressed into a solid mass.

Abstract: Process and apparatus for cooling the wall of the vessel of a fast neutron reactor comprising a main vessel which surrounds a second vessel containing the core and separating a volume of liquid metal contained in the main vessel into two regions called the hot collector and the cold collector respectively. The liquid metal drawn into the cold collector and passed through the core to the hot collector is circulated by means of pumps distributed around the core. A baffle and a counter-baffle are arranged concentrically to the main vessel wall and respectively define a first and second annular space issuing into the cold collector. The first annular space is traversed by a tapped flow of cooling liquid metal circulating from bottom to top in the first space in contact with the main vessel wall up to an upper constant level adjacent to the edge of the baffle.

Abstract: A process for coating an article such as a turbine blade composed of nickel-base alloy, comprises the steps of surrounding the article by a particulate pack in a chamber, the pack including coating material in elemental or chemically combined form, said coating material selected from the group comprising aluminium, chromium, titanium, zirconium tantalum, niobium, yttrium, rare earth metals, boron and silicon together with a halide activator, preferably of low volatility, and cyclically varying the pressure of an inert gas or a reducing gas or a mixture of said gases contained within said chamber, while maintaining the contents of the chamber at a temperature sufficient to transfer coating material onto the surface of the article and form a diffusion coating thereon.

Abstract: A discrimination circuit operable to discriminate between an input signal in the form of a pedestal and disturbance signals superimposed thereon has an A-D converter to digitize a disturbance-free reference pedestal signal, circulating shift register to store the digitized reference signal, a D-A converter to produce a pedestal signal from the reference signal, a controlling clock to shift the reference signal in the store in synchronism with the incoming signal such that the two pedestal signals are available together, and a comparator to compare the reference signal with the input signal to produce an output caused by differences due to disturbances. The circuit forms part of an optical surface inspection apparatus.

Abstract: Multiple strands of undyed yarn are fed continuously from supply spools or bobbins supported on a creel to a skein winding apparatus. The strands each pass along a substantially horizontal path through one or more spaced dyeing stations where they are engaged by an oscillating frame and caused to oscillate laterally back and forth from said paths while streams of dye individual to the yarns are continuously directed onto the yarns from a series of overhead tubes at the dyeing stations. The strands thus periodically interrupt the dye stream of the associated tubes and receive dye at a multiplicity of spaced portions along their lengths with intervening portions of the yarns remaining uncolored. The space dyeing can be varied by changing the speed of movement of the yarns, by varying the amplitude and speed of movement of yarn guide means which produces the lateral oscillation of the yarns and by selectively operating varying numbers of dye stream feeders at one or both dyeing stations.

Abstract: A cardiac pacer lead is disclosed as being formable at the time of pacer implantation by the attending surgeon, by heating the pacer lead, as in boiling water, and then forming or shaping it to the desired configuration so that a pacer electrode is maintained resiliently in contact with the inner surface of the patient's heart, e.g. his atrium. The pacer lead comprises at least one flexible conductor about which is disposed a first insulating layer of a repeatably thermally-activated material to permit its formation into a desired configuration, and a second insulating layer disposed thereabout of a character suitable for implantation within the patient's body, i.e., resistant to corrosion by body fluids. Further, there is disclosed the method of assembling and attaching the cardiac pacer lead to a body organ, e.g., the patient's heart.

Abstract: An inertial platform having four gimbals, an intermediate one of which is capable of only limited movement, has pickoffs and torque motors on each gimbal axis. Part of the intermediate gimbal and an adjacent gimbal are removable, these parts being joined by a gimbal bearing.

Abstract: Tank for a motorized compressor, more particularly for an installation for he isotopic separation by gaseous diffusion, which has a generally cylindrical shape and a vertical axis containing a motorized compressor with an axial intake for a low pressure gas flow, a lateral intake for a medium pressure flow to be mixed in the motorized compressor with the low pressure flow and a diffuser for forcing back the high pressure flow at the outlet from said motorized compressor, whereby said tank has a first lateral opening for the entry of the medium pressure flow and a second lateral opening for the discharge of the high pressure flow, wherein for ensuring separation of the medium pressure flow before entering the motorized compressor and the high pressure flow at the outlet from said motorized compressor, it comprises a truncated cone-shaped skirt whose large base is inclined relative to the tank axis, said skirt being fixed to the tank along a continuous line passing on the one hand below the first opening for th

Abstract: Liquid dispensing apparatus for dispensing a blend of first and second liquids has flowmeters operable to measure the quantity of each liquid delivered. The flowmeter outputs are multiplied by a factor equal to the proportion of one liquid in the blend and used to control a stepping motor which operates a blending valve. An error correction circuit is provided to correct for any accumulated error, and the apparatus also includes a cost determining circuit.

Abstract: A distance measuring arrangement has an accelerometer transducer of the force balance type in which a switch closed by the action of an acceleration force causes a constant current to flow in a coil to oppose the force and open the switch. The switch opens and closes in a repetitive cycle at the resonant frequency of the system, the closed switch gating clock pulses to integration means. The transducer may take two forms. In the first the proportion of time that the switch is closed in each cycle is proportional to the acceleration value. Distance measurement comprises counting the clock pulses to effect a first stage of integration and summating the counter totals every 1000 clock pulses to give a distance travelled signal. In the second, the proportion of time that the switch is closed in each cycle is proportional to the square root of the acceleration value and distance measuring comprises counting the clock pulses to give a signal proportional to the square root of distance travelled.

Abstract: A transistor logic circuit includes a constant current source in the form of a current mirroring arrangement connected to a logical gating combination of switching transistors, the arrangement being such that the switching transistors do not saturate.