Abstract: PCM words transmitted on a number of incoming and outgoing links during time slots according to a time division multiplex system are space interchanged by utilizing a circulating shift register wherein at the beginning of their allotted time slots, each of incoming PCM words is registered each in an associated shift register stage. The circulating shift register is stepped by a clock pulse so fast that each PCM word is stepped through all shift register stages during the respective time slot. Control words, each associated with one of the time slots and with one of the outgoing links, determine during which clock pulse an outgoing link is connected to the output of its associated shift register stage. A buffer memory arranged between the circulating shift register and the outgoing links re-establishes the correct time division multiplex system for the outgoing PCM words.

Abstract: A collapsible brush is provided with bristle members having bristles of varying length so that a curved top surface is provided to aid in the brushing of a woman's hair. Also provided is an extension which receives in sliding relationship a sliding handle for holding the collapsible brush. A cover when slid into a tracked recess engages the handle to propell it to an extended position. The sliding handle is provided on its lower surface with a mirror which is visible through an opening formed in the bottom wall of the extension when the sliding handle is in its inward or retracted position.

Abstract: A method of bonding powdered material to a surface comprising placing at least one layer of powdered material onto a support of ductile material, positioning a surface to be coated by the powdered material in facing spaced relation with the powdered material and placing an explosive charge on the support on the surface thereof opposite the powdered material. The explosive charge is then detonated to produce acceleration of the support and the powdered material thereon towards the surface to be coated to cause impact of the powdered material with the surface to be coated and welding thereof. The detonation of the explosive charge proceeds along the length of the charge to progressively bring the powdered material into impact contact with the surface to be coated. The speed of detonation of the explosive charge is less than the speed of sound in the powdered material or support.

Abstract: Optical receiver arranged to provide a dispersion-compensated detection of digital information transferred by a light pulse train via a fibre optic conductor, includes a registering means and a timing regenerating means connected in parallel to the fibre optic conductor via an optoelectrical converter. The registering means has a sampling terminal, an activation input that is arranged for a short activation of the sampling contact and which is connected to the timing regenerating means, and an output that is arranged for reproducing the registered digital information transferred by the light pulse train. According to the invention, the optical receiver has a decision means with a decision level determining input supplied with a control voltage obtained from the output of the registering means via a digital-to-analog converting link and is interconnected between the optoelectrical converter and the sampling contact of the registering means.

Abstract: The positioning of the head positioning mechanism of a magnetic disc file is controlled by a servo system arrangement which involves separately monitoring the temperature conditions in the vicinity of the center track of a disc file and the head positioning mechanism; producing related electrical signals which are used in conjunction with signals defining the address of a required track of a disc and a reference voltage to obtain a temperture corrected signal which is used to produce a head positioning control signal.

Abstract: There is disclosed a stand for releasably locking a pole-like member in upright position, especially for setting up a Christmas tree. The stand has a tubular holder in which are provided several equally plate-shaped clamping members. These clamping members can be simultaneously radially inwardly moved and also outwardly displaced, thereby adapting the stand for receiving tree trunks of different diameters and clamping the trunks by displacing the clamping members radially inwardly. Setting of the clamping members is effected by a setting device, operation of which acts simultaneously upon all the clamping members.

Abstract: A brilliantized step cut diamond has a straight edged polygonal shaped girdle with side and corner facets, a crown with a table and a table-and-girdle breaks which are faceted; and a pyramidal base having a point culet, a culet break and a girdle break with ridges extending from the culet to the corner of the girdle. A fan with three pairs of triangular halves is disposed symmetrically about each ridge with a triangular facet in each corner of the base having an edge which is colinear with the edge of a corner facet and an apex at a ridge.

Abstract: A brilliantized step cut diamond has a straight edged polygonal shaped girdle with sides and corner facets; a crown with a table and a table-and-girdle breaks which are faceted; and a pyramidal base having a point culet, a culet break and a girdle break with ridges extending from the culet to the corner of the girdle. A fan with three pairs of triangular halves is disposed symmetrically about each ridge with a triangular facet in each corner of the base having an edge which is colinear with the edge of a corner facet and an apex at a ridge. The angle between the culet break and the plane of the girdle is between 30.degree. and 43.degree..

Abstract: An optical fire detector has a radiation-emitting means which emits a beam of radiation which, after passing through an intermediate air-medium is received by a radiation detecting means for providing an alarm upon an obscuration of the beam or radiation. The radiation-detecting means has first means for individually measuring the intensity in a first and a second wave-length band of the beam of radiation and second means for comparing the invididually measured intensities to provide the alarm upon a predetermined difference between such intensities.

Abstract: Apparatus for regulating the output of a system feed with a fluid medium irrespective of the instantaneous pressure in the system comprising a regulating device including an adjustable throttling connected in the inlet line of the system. A preset non-return valve is connected downstream of the throttling and a spring loaded non-return valve is connected in series with the preset non-return valve and is fitted with a leakage connection extending to a reservoir tank. A control line is connected between the pre-set non-return valve and the spring loaded non-return valve and it senses pressure drop at the throttling so that when the pressure drop reaches a predetermined value the non-return valve opens so that fluid medium is transferred and pressure in the control line increases. A central device is connected in the control line for regulating a quantity of flow to the primary line and the control device comprises a spring loaded piston actuated by increased pressure in the control line.

Abstract: A self-balancing tray for carrying glasses, cups, canapes consists of a disc supported by a frame to which a holder is releasably attached. A grip is fastened to the holder by a freely board-able thread or chain at a point coaxial with the center of the disc thereby causing the tray to assume a horizontal position irrespective of motions applied to the grip when the tray is carried.

Abstract: A pair of rollers define between them a narrow gap which is supplied with sludge to be treated. The sludge is conveyed by one of the pair of rollers to a third roller in contact with the conveying roller. The third roller is spaced a short distance from a rotating drum carrier to which is applied a thin film of the sludge. The sludge is applied to the carrier by the formation of a sludge bulge, which is an accumulation of sludge, in the area defined by the carrier, the third roller, and the conveying roller. The drum carrier picks up the sludge from the sludge bulge forming a film of sludge whose thickness is limited by the spacing of the third roller from the carrier.

Abstract: The invention concerns a method for improvement of the crosstalk attenuation between adjacent channels in a time division multiplex system, for example a PCM-system. The crosstalk will have contributions from both the transmitting and the receiving side of the system. The greatest part of the crosstalk arises during the sampling times in the transmitter and the receiver, due to residual charges from the sampling of the preceding channel. In order to carry out the method a modulo-2-adder is arranged in the coder or the decoder of the PCM-system. The modulo-2-adder is inserted in the connection associated with the polarity bit of the PCM-word between a series-parallel converter and a digital-analog-converter in the decoder, or between an analog-digital-converter and a parallel-series-converter in the coder, respectively. The adder also receives signals from a clock oscillator with half the word frequency.

Abstract: A single-shot element, an interruption element and a valuation device are arranged for indicating signal pulses having a duration which exceeds a limit value and to suppress disturbing pulses having durations which are less than the limit value. Upon each leading edge of any pulse, the single-shot element begins to generate a control pulse which ends either due to an interruption or when its duration reaches the limit value. The interruption element interrupts the control pulses by means of the trailing edges of the disturbing pulses. While uninterrupted control pulses cause, the valuation device to generate indication signals which indicate a signal pulses.

Abstract: In a pipelined data processor, each processing stage is provided with its own copies of relevant machine registers. Whenever a processing stage updates a register, it sets a flag. The flags and register copies are shifted along in step with the flow instructions down the pipeline. These flags are used to control multiplexers which ensure that each stage is provided with the most up-do-date copy of each register, taking into account any updates by succeeding stages.

Abstract: An electrified fence for fencing-in livestock and fencing-out wild animals has as electric conductors pliable multi-layer ribbons including an outer and an inner metal layer. The two metal layers are separated by insulation layers made of plastics material. The inner metal layer is covered on its outwardly facing side by an insulation layer. The outwardly facing side of the outer metal layer is light reflective and the outside of the cover layer for the second metal layer is dark-colored. The ribbons are detachably secured to fence poles and are chargeable with a high voltage.

Abstract: Optical test apparatus and method for testing various parameters of a lens system such as a T.V. lens system. A single apparatus may be used for testing the modulation transfer function, glare, spectral transmission, relative field illuminance, transverse color, T stop, and back focal distance.The apparatus comprises a pin hole light source and an analyzer means in which the lens may be mounted including a set of screens carrying varying patterns for measuring different parameters. The light transmitted through the screens is measured by a light detector means and the output signal is analyzed to provide a measurement of the parameters.

Abstract: In a keyboard there are a plurality of key operated variable capacitor switches acting as differentiators to change the widths of electrical pulses which are then integrated to give signals whose level indicate which switches have been operated. The gain and operating points of amplifiers can be changed to change the transfer function of the electronics and thus increase the mechanical hysteresis of the switches.

Abstract: A cable for carrying high voltage has encompassed on its metallic conductor core with an inner layer of semiconducting material. An insulation layer encompasses this semiconducting layer and is in turn encompassed by an outer semiconducting layer. This outer semiconducting layer is strongly bonded to the underlying insulation layer and its outer surface resistivity is selected to be within the range of 10.sup.7 - 10.sup.9 ohm/square. Such resistivity range equalizes the voltage distribution within the cable jacket and also facilitates splicing cable ends and terminating the cable as the outer semiconducting layer need not and in fact cannot be readily removed.

Abstract: A cathode ray tube (CRT) display system utilizing a parallel line raster scan displays characters formed from matrices of dots written during the parallel line scans. When the parallel lines are vertically displaced horizontal lines, the height of the characters is changed by switching between a sequential scan line raster and an interlaced scan line raster, and the width of the characters is changed by controlling the number of times each of the dots is sequentially displayed in its associated scan line.