Abstract: A hydrodynamic cable fairing section comprising a nose portion for receiving a cable, a trailing body portion, and a plurality of vanes projecting outwardly from the body portion. The body portion includes two side surfaces that extend from the nose portion towards a trailing edge which forms part of the body portion. A plurality of vanes extend on both side surfaces and are substantially parallel to each other. Each of these vanes comprises flat surfaces which taper toward the trailing edge of the body portion.

Abstract: An anti-skating device for a disc-record player comprises two permament-magnet plates carried by the pickup-arm support and each extending over a sector of a circle round the same, the plates being magnetized, each across its thickness, with opposite polarities to produce each a magnetic flux at right angles to the direction of plate movement, and a coil fixed to the player structure in which two conductor elements extend across the flux of each magnet plate respectively, transversely to the direction of magnet movement, and carry the coil current in opposite directions.Current cut-off means are preferably provided to allow the winding to be de-energized when, particularly during a cueing operation, the pickup stylus is lifted from the record surface.

Abstract: A content addressable memory comprising for each storage element two non-volatile storage devices which can be non-destructively read and which are adapted to respectively store true and inverse information data, the two devices being interconnected in a manner which is such that information data stored by each device can be simultaneously compared with information data applied to the memory, the input of each of the two devices being connected to a separate terminal.

Abstract: The invention relates to an installation aid for 5005 Xbar System exchanges to enable a considerable amount of cabling work to be carried out even before racks and suites are installed. The proposal makes use of wiring-biscuits, or plates formed from rigid plastics sheet, each comprising a "break-off" perforated strip for each row of the terminal block and each strip having its perforations at the same centers as the tags or terminals of a row. The method of operating on the end of a cable involves the mounting of the plate in a location close to the position occupied by or to be occupied by the terminal block, the threading of the insulated wires of the cable through particular holes of the plate, the eventual separation of a strip from the plate, the placing of that strip upon a requisite row of terminals of the duly located terminal block so that one wire and one terminal emerge from some or all of the perforations, and then the establishment of gun-wrapped connections between each said terminal and wire.

Abstract: A mounting arrangement for mounting scanning coil/yoke structures on the neck of an electron beam tube comprises in addition to position adjustment means for producing lateral displacement of the scanning coil/yoke structure on the neck of an electron beam tube along two mutually perpendicular axes as well as axial displacement of the structure along the tube neck, tilt adjusting means for producing tilt of the coil with respect to the axis of the tube neck and constructed and arranged to afford simultaneous lateral displacement and tilt of the coil structure relative to the tube neck axis to afford optimum convergence control taking into account mechanical limitations imposed by the tube neck on which the scanning coil is mounted.

Abstract: In a disconnectable optical fibre butt connector, each of two fibres 1, 2 to be butted, is supported near an end by a bush 3 carried by a flanged carrier disc 4 in a seating of a flanged cap 8. An alignment unit comprises three alignment rods 12 located in a distortable elastic sleeve 13 which is enclosed in a rigid tube 15. To assemble the connector, the fibre ends 1, 2 are inserted between the alignment rods 12 from opposite extremities, and are pushed home till they butt each other. The caps 8 are then screwed onto opposite extremities of the tube 15, forcing the flanges 5 of the carrier discs 4 against the sleeve 13, which distorts, clamping the fibre ends 1,2 in alignment between the alignment rods 12. The alignment unit may form part of a pressure-tight bulkhead.

Abstract: A logic flip flop arrangement wherein each of the two outputs of the flip flop has an output gate associated therewith, wherein an input of each of the output gates is connected to an output of a driving gate, and wherein at least one of the output gates has an output thereof combined with an output of that one of the driving gates which is associated with the other output gate to provide a logic function.

Abstract: A cylindrical magnetic domain device which includes a layer of uniaxial magnetic material having a unique easy magnetization direction substantially normal to a major surface thereof; generating means for generating cylindrical magnetic domains within the said layer; propagation means which define at least three propagation paths in which the generated cylindrical magnetic domains can be caused to propagate; and switching means for effecting the transfer of the propagating cylindrical magnetic domains from one of the said propagation paths to at least another one of the said propagation paths, the switching means including at least three magnetically permeable elements formed on the said major surface and oriented relative to each other and the propagation paths in a manner such that expansion of the propagating cylindrical magnetic domains can be effected; and magnetic field impulse generating means positioned to encompass at least the central element of the switching means.

Abstract: A vibratory atomizer for atomizing a liquid, the horn and piezoelectric crystal being housed in a housing but separated from the housing by a rubber O-ring so that energy loss to the housing is minimized.

Abstract: Each processor in the system is provided with a processor bus over which access to all storage and peripheral equipments is gained. Each access is performed as an address read or write operation. However, under certain circumstances it is necessary to perform a "read-and-hold" operation when accessing a data word which is to be modified. Typically, entries in the master capability table fall into such a category where the data word, while being modified, must not be accessed by any other processor. In such a read-and-hold operation it is vital that the store accessed is held throughout the period of the read-and-hold operation. This facility is obtained by incorporating parity inverting arrangements in each access unit and each processor so that the parity for a read-and-hold operation is inverted. A failure of the hold facility would be detected by the interrogating processor since a parity failure would be observed at the end of the operation.

Abstract: Envisages the use of a format of serial digital signalling in which each data word comprises a predetermined number of bytes formed by bits of substantially uniform duration and in which each byte comprises a "start" bit of a first binary significance (e.g. 0) a "stop" bit having a second binary significance (e.g. 1) and an identical plurality of "data" bits immediately succeeding said "start" bit and in which the final byte of the data-word is characterized in that it has an additional bit having said first binary significance 0 interposed between last "data" bit and the "stop" bit thereof. The reading of that bit immediately succeeding the last "data" bit of each byte of each data-word of a transmission produce a so-called synchronizing pulse-sequence comprising bits of said second significance for all bytes except that last and a bit of said first significance for the last byte.A response circuit is provided normally to maintain byte-to-byte synchronization.

Abstract: Intended to give cost, size and possibly performance advantage over a conventional hybrid transformer arrangement, by using operational amplifiers with semiconductors. Typically the input and output at the 4-wire side are each unbalanced, and the 4-wire side input path involves a line driver comprising driver amplifiers for each conductor of the balanced 2-wire line. The driver amplifiers are operative over a resistor bridge network extending to the 2-wire line. Another pair of series-connected operational amplifiers constitute a common mode rejection receiver between the 2-wire line and the 4-wire output and are controlled from diagonals of said bridge. It is necessary to provide for cancellation of the coupling between the 4-wire incoming and outgoing paths, and this is effected by using a signal from the output of the inverting amplifier for disablement of the receiver.

Abstract: A probe for scanning optically encoded data in the form of elongate bars comprises a resiliently mounted tip which in use is scanned across the data to be read and which is retractable under pressure into the body of the pen.

Abstract: An acoustic surface wave filter for use as an intermediate frequency filter in a P.A.L. color television receiver comprising input and output transducers each having fingers of conductive material supported on a piezoelectric substrate the fingers of each transducer being electrically connected to a pair of terminal pads so that the fingers connected to one pad interleave with the fingers connected to the other pad, the transducers being mutually offset in a direction orthogonal to the direction of acoustic surface wave propagation and coupled by means of a multistrip coupler.

Abstract: Bipolar digital repeaters are commonly fed with a constant d.c. supply but with the known circuit, the mode of use of transformer-coupled output stage places a limitation on the voltage-amplitude of the output pulses. The 120 M bit/s data transmission system may occasionally require to have its repeaters operate over line-sections of exceptionally high attenuation. The proposed circuit is intended to meet these requirements, using modified connections to the transformer (3 equal windings) and minimal additional components, the maximum peak-output voltage is consequently doubled with no increase in the constant current supply. The new technique, involving a serial connection, ensures that all of the supply current becomes available for the means current in pulses of each polarity separately instead of the two polarities together.

Abstract: An illuminated optical viewer for facilitating corrective operations on an object comprises a work platform which can be moved along two mutually perpendicular coordinates and on which in use of the viewer the film negative or other object to be touched-up or to have any faults corrected will be positively located first optical means projecting an enlarged objective image of a small area of the object, located at one position, on to a screen, second optical means producing an enlarged stereoscopic virtual image of a portion placed at a second position displaced from said one position by a predetermined distance in a predetermined direction, said virtual image being formed in substantial alignment with the portion of the object at said second position, scanning means for adjustably moving the object along two co-ordinates of a plane, and two-position changeover means for so shifting the object as to displace an object portion which is located at said one position to said second position without affecting the a

Abstract: A circuit for generating synchronization signals from a digital data pulse train having a bit period T and conveying pulses in non-return-to-zero form. The circuit comprising (i) a rectifier device arranged to fullwave rectify the digital data pulse train, (ii) an oscillatory circuit tuned to oscillate with period T and stimulated by the transitions of a waveform produced by the fullwave rectifier device and (iii) a peak detector arranged to produce a bias signal which is proportional to the amplitude of the output of the oscillatory circuit. The bias signal being active upon the fullwave rectifier device to stabilize the amplitude of the waveform produced by the oscillatory circuit.

Abstract: A transistor arrangement having a relatively low charge storage period including an N.P.N. transistor having the base thereof connected to the emitter of a P.N.P. transistor and to an input terminal, the collector thereof connected to the base of the P.N.P. transistor and to an electrical supply terminal, and the emitter thereof connected to the collector of the P.N.P. transistor and to another electrical supply terminal.

Abstract: A fuel injection nozzle arrangement comprising a fuel injection nozzle having a fuel injection orifice, and vibratory means such as a piezoelectric crystal for vibrating the nozzle to cause atomization of fuel ejected from the nozzle through the orifice, the nozzle having a fuel-retaining valve at the fuel inlet side of the orifice arranged to normally close the orifice and thus prevent the injection of fuel but to be opened when the vibratory means is energised to permit injection of fuel, and the nozzle having a gas-excluding valve at the fuel outlet side of the orifice arranged to normally close the orifice and thus prevent the entry of gases into the nozzle through the orifice but to open under fuel injection pressure to permit the injection of fuel.

Abstract: A control system for a gas turbine, which control system comprises a fuel pressurizing pump and two fuel flow restrictors supplied with fuel at different pressures from the pump, said restrictors being in communication with a common fuel pipe line, and there being electrically actuated means, e.g. a rotenoid, for varying the fuel pressure in the common fuel pipe line whereby said varying fuel pressure can be used for controlling the output of the gas turbine.