Abstract: The method of manufacturing a striped screen for a colored cathode-ray tube having a shadow mask with rows of elongate apertures. Adjacent apertures in each row are separated by a solid bridge. The photosensitized screen is exposed to light from a elongate light source parallel to the longitudinal directions of the apertures. By moving the light source uniformly during the exposure over a distance substantially equal to an integral number of times the length of the light source and the direction of the longitudinal axis, a line structure is exposed on the photosensitized screen, and the width of the lines is very constant.

Abstract: A bridge circuit provided with an isolation transformer having four primary windings which are connected such that the voice currents do and the supply currents do not generate a resulting flux in the core of the transformer and which comprises two transistor circuits. These circuits on the one hand prevent the flow of voice currents via a supply source connected to the bridge and on the other hand balance the bridge circuit so that the influence of longitudinal noise signals which are produced in a transmission line connected to the bridge circuit are suppressed.

Abstract: Benzoyl phenyl urea or thiourea derivatives are used as active substances in insecticidal compositions.

Abstract: The invention relates to a charge-coupled device in which the charge transport takes place in the form of majority charge carriers via the bulk of a surface layer of the first conductivity type which forms a p-n junction with a substrate of the second conductivity type. The comparatively thick and high-ohmic surface layer has a comparatively thin low-ohmic buried zone of the first conductivity type which adjoins the said p-n junction. The buried zone forms a buffer layer against the depletion zone belonging to the p-n junction. Without detrimentally influencing the transport properties, a low-ohmic substrate may be used, which has important advantages in particular with respect to the leakage currents.

Abstract: An I.sup.2 L circuit comprising plural stages connected in series across a supply voltage. In order to reduce the turn-off time of a switching transistor in a lower stage actuated by a signal from a higher stage, a current mirror is coupled to the base of the switching transistor.

Abstract: In a delta-modulation encoding arrangement having step-size control drift voltages and miss-match between the charge and discharge pulses for the first integrating network in the feedback circuit produce an additional DC voltage on this integrating network. This additional DC voltage is compensated by an additional feedback circuit comprising a second integrating network. However, if the signal to be encoded rapidly decreases from a large to a small amplitude and when after this rapid decrease the information signal only has a small amplitude an additional distortion is introduced for these small signals. To obviate this a modulation arrangement is included in the extra feedback circuit, which modulation arrangement is controlled by a control signal which derives a control signal from the delta modulation output pulses.

Abstract: Apparatus for reading a record carrier on which a television signal is recorded. In order to ensure an accurate time error measurement for a time error correction device, use is made of a burst signal which is locked to the horizontal synchronizing pulses. Said burst signal may be constituted by the color burst signal or an additional burst signal which is superimposed on the horizontal synchronization pulse. In order to obtain a pilot signal for the time error measurement a keying signal is generated with the aid of a generator which is controlled by the horizontal synchronizing pulses, the beginning of said keying signal being situated within the time interval of the burst signal. The first zero passage of the burst signal which appears after the beginning of said keying signal is employed as a pilot signal for the time error measurement.

Abstract: An electric drip coffee maker having a brew control device for selectively varying the coffee strength between weak and strong, while independently varying the quantity of coffee brewed.

Abstract: A combined tone-speech audiometer for the semi-automatic recording of the measuring values found both in tone audiometry and in speech audiometry, the measuring point each time being defined by the point of intersection of two sliders. For tone audiometry the frequency slider is locked in locking positions which are non-equidistant, whereas for speech audiometry it is locked in positions which are equidistant. For this purpose a rotatable roller, spindle or the like is provided which has on its circumference two groups of locking positions, one for tone audiometry and one for speech audiometry. To change from one locking mode to another the spindle is rotated until the other group of locking positions is operative.

Abstract: A guide for limiting displacement of a printing head parallel to the printing direction in a printing device. The printing head is displaceable along two parallel guide rods which are detachably connected on a supporting beam which extends parallel to the guide rods. The supporting beam is detachably connected to two side plates which extend transversely of the beam and which are provided with projections which fit in recesses provided at each of the end faces of the beam. The guide provides a mechanically stable construction that is readily detachable.

Abstract: In a method for the manufacture of twistless or substantially twistless yarn a sliver or a roving of staple fibres is used as basic material. The sliver or the roving is wetted by a liquid mixture containing a latent solvent for at least a portion of the staple fibre material and drafted in a wet condition to form a thinner fibre strand, which is subsequently false twisted and bonded. The fibre strand is bonded by activation of the latent solvent under an increased temperature, and dried under evaporation of the solvent.

Abstract: A method of manufacturing transistors by means of ion implantation is characterized by the implantation of a uniform extrinsic base zone, by providinbg a mask having at least two windows, and by the implantation of the emitter zone and then of the intrinsic active base zone via a first window, after which the implanted zones are annealed.

Abstract: A multi-space Stirling cycle reciprocating machine having a control device for supplying working medium to the working spaces. A pressure-controlled annular body in the device allows passage of working medium to the working spaces, exclusively by shape changes, each time at the relevant maximum cycle pressure.

Abstract: An apparatus for feeding sheets of paper or the like in succession from the top of a stack of sheets. A member extending over a corner portion of the stack controls a stack elevator mechanism, and co-operates with a vertically movable suction element which pulls a corner portion of the top sheet from beneath the member so as to feed one sheet at a time.

Abstract: A resistance material consisting of a mixture of metal oxide and/or metal oxidic compounds and any metals with a binder, which material comprises a metal rhodate of the type M.sub.3 Rh.sub.7 O.sub.15, by way of resistance determining component. This material has a small negative TCR which is substantially constant in a large temperature range.

Abstract: A method of rendering a cable having a core consisting of a plurality of conductors longitudinally watertight. A silicone rubber which vulcanizes upon exposure to moisture is used between the conductors either throughout the entire length or in blocks.

Abstract: An electronic solid state device comprising an inhomogeneous body in which grains of semiconductor material are present. The contact between adjoining grains is such that in the interface regions there is continuity between the bulk material of the adjoining grains and the dominant current conduction paths in the body lie within the grains via said grain to grain contacts. At the surfaces of the grains adjoining said interface regions rectifying barrier forming means are provided to enable control of the said current paths by surface field effect depletion in the interface regions. Said means can be opposite conductivity type surface layers at or on the grains. In other devices said means are formed by adsorbed gas atoms, ions or molecules. The said control may be employed to yield photoconductive layers with controllable gain and speed of response, said layers being used, for example, in solid state imaging devices.

Abstract: A device for ultrasonic examination, comprising a flat mosaic of a row of transmission transducers and a number of rows of receive transducers which are symmetrically arranged with respect thereto. The device furthermore comprises means for applying actuation pulses to one transmission transducer at a time, and means for enabling receive transducers in the time interval following each actuation pulse, and for at the same time displaying on an image display device an image of a section of the examined body in a plane perpendicular to the plane of the mosaic and through the line of transmission transducers.

Abstract: By using a double potentiometer one of which is used for tuning and the other for adjusting a level whose variation suppresses an automatic tuning correction, a great freedom can be obtained in designing the tuning section of a receiver with automatic tuning correction suppression.

Abstract: A safety and test device for railway signalling systems comprising a calculating device or computer adapted to treat information signals, relating to prevailing speed and desired speed, and to activate a brake device if said treatment reveals that speed reduction is necessary. In order to control itself the computer is programmed to run through special test programs, suitably sections of the ordinary program with given start data, and at the end of each such test program generate a control word, specific for each test program and coming in a given sequence. A control unit connected between the computer and the brake device receives the control words generated by the computer and compares them with correct words stored in a memory and generates an output pulse, each time an incoming control word coincides with a correct control word stored in the memory.