Abstract: A drive nut has a hollow interior in which a plurality of cantilever clamping members which are arranged with equal spacing around a common circle and extend substantially parallel to the nut centerline, and which are rigidly and integrally fixed at their lower ends to the nut inner side near the bottom seating surface thereof. The clamping members thus form a substantially cylindrical passage through which a mating member with a male screw thread is forcibly driven axially from the side of the seating surface relative to the nut to be quickly but positively locked by the drive nut.

Abstract: A device for measuring the amount of rotation of a rotating object is provided with a sensor unit made up of the rotating object and stationary members arranged to form two pairs of capacitors therebetween. The confronting surfaces of the rotating object and stationary members are graduated with gear-like cuts so that while the capacitances of two of two pairs of capacitors are maximum, the capacitances of the other capacitors are minimum. The device further comprises a pair of oscillators coupled to the two pairs of capacitors, and a mixer connected to the oscillators so that the difference in capacitance between the capacitors is obtained as the difference in frequency, which is processed to provide the amount of movement of the moving object.

Abstract: A solid bowl decanter centrifuge of the scroll discharge type comprises a solid bowl which rotates at a first speed, and a scroll conveyor which is rotated within the bowl at a second, slightly different speed for conveying separated solids to a solids discharge end of the bowl. The suspension to be centrifuges, substantially unmixed with a flocculant, is introduced by a stationary feed pipe into a feed compartment which is a radial passage in the conveyor. The feed compartment provides high turbulence and shear forces which mix and expel the suspension and flocculant into the bowl before flocs have formed.

Abstract: A device for measuring the amount of movement of a straightly moving object is provided with a sensor unit made up of the straightly moving object and stationary members arranged to form two pairs of capacitors therebetween. The confronting surfaces of the moving object and stationary members are graduated with gear-like cuts so that while the capacitances of two of the capacitors are maximum, the capacitance of the other capacitors are minimum. The device further comprises a pair of oscillators coupled to the two pairs of capacitors, and a mixer connected to the oscillators so that the difference in capacitance between the capacitors is obtained as the difference in frequency, which is processed to provide the amount of movement of the moving object.

Abstract: 5-amino-1,2,3,4-tetrahydroanthraquinone, as a new industrial product, is disclosed together with its preparation by reduction from 5-nitro-1,2,3,4-tetrahydroanthraquinone.

Abstract: A method of sealing leaks is disclosed comprising the use of a bituminous rubber latex emulsion. The emulsion is introduced into the passage through which a fluid is leaking by injecting, often at considerable pressures and a coagulant is used to coagulate the emulsion. Water may be used as a coagulant. Alternatively, the emulsion may be carried into the passages by the water.

Abstract: New fluorinated telomerization products are disclosed which are products produced by the reaction of:a. one mole of an ester of one or more acids of the formulaHS-A(COOH).sub.n (I)with one or more polyols, andb. 1 to 5 moles of one or more compounds possessing at least one ethylenic bond, one at least of these compounds conforming to the general formula ##STR1## In formulae (I) and (II), A represents a hydrocarbon radical which may contain atoms of oxygen, nitrogen, phosphorus, sulphur or halogen, n is a whole number from 1 to 4, Rf is a perfluorinated chain containing 1 to 20 carbon atoms, B is a bivalent chain, one of the symbols R represents a hydrogen atom and the other a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms. These products when applied to substrates, such as textile fabrics, confer on them a permanent anti-stain and soil release finish while permitting easy elimination of soil by washing.

Abstract: A knife holder has a base (2) which supports several gripping members (9) in the form of rollers (12) of elastomer placed pair-wise in side-by-side relationship and cooperating with each other. The rollers (12) are each mounted on a journal (13) located on the base (2) and have facing circumferential surfaces (14) which form therebetween a nip (15). A knife (10) may be moved with its blade (11) into and out of the nip, the rollers (12) rolling on both sides of the blade and under elastic blade (11) retentive deformation of the rollers. A protective outer casing (3) is removably mounted on the base (2) and has recesses (17) in the region of each gripping member (9) in order to permit ready insertion and removal of the knives (10).

Abstract: In an electrochemical cell such as a sodium sulphur cell using a ceramic electrolyte tube (e.g. of beta-alumina), the electrolyte tube is secured to a rigid annular element of, for example, alpha-alumina, having substantially the same coefficient of thermal expansion as the electrolyte tube, this annular element being radially thicker than the electrolyte tube and having two oppositely sloping tapered surfaces on its outer face. Metal elements are then forced onto the tapered surfaces with an interstrate layer of soft metal, e.g. aluminium, which deforms into a groove or grooves in the tapered surfaces to form a hermetic seal.

Abstract: A drug useful as antiarhythmic, antidepressant and anxiolytic containing as an active agent a compound of the formula ##STR1## wherein X and Y are the same or different and represent hydrogen or halogen atoms, or 1-4C alkyl groups, 1-4C alkoxy groups, 1-4C alkylthio groups, CF.sub.3, OH, NH.sub.2, 1-4C monoalkylamino or amino groups substituted by a 1-4C alkylsulfonyl group, a 1-5C alkylcarbonyl group or an aroyl group and A is a CO, CHOH or CH.sub.2 group, or a salt of said compound with a pharmaceutically acceptable acid, is disclosed together with methods for the preparation thereof and its use in human therapy.

Abstract: A high strength steel, suitable for polishing and acid-resistant cohesion, comprising besides iron and the usual residual elements, at most 2% (by weight) of C, at most 1% (by weight) of Si, at most 5% (by weight) of Mn, at most 15% (by weight) of Cr, at most 12% (by weight) of Ni, at most 4% (by weight) of Cu, at most 3% (by weight) of Mo, at least 0.005% (by weight) of N, 0.005% to 0.25% (by weight) of Zr and/or Be, 0.001 to 0.2% (by weight) of Al, 0.04 to 1.5% (by weight) of Nb and/or V, at least 0.001% (by weight) of Ca and at least 0.001% (by weight) of B and/or Ce.

Abstract: For a cylindrical sodium sulphur cell, a cathode electrode structure is provided with improved electronic conductivity in the radial direction, compared with other directions, by forming a block of fibre material, e.g. graphite fibres, with the fibres aligned in one direction, slicing the block to form a sheet with fibres normal to the plane of the sheet, moulding the sheet and impregnating it with cathodic reactant in a heated mould having a plurality of ribs, to form a plurality of trapezoidal segments with the fibres normal to the planes of the parallel surfaces of the trapezoids, cooling the mould so that the impregnant is solidified and then forming the trapezoids into an annular structure. Preferably the mould is such that thin webs are left joining adjacent trapezoidal sections along parallel edges of the wider of the two parallel faces so that the webs form hinges for folding the segments into the annular assembly.

Abstract: A system of frequency-shifting of frequency modulated signals, continuously above or below a pre-established frequency, the shift being possibly also null. The system includes a source of frequency modulated signals, the frequency of which is to be shifted; a reference oscillator; a first phase locked loop to which is applied the signals from the signal source and the output of the reference oscillator, the arrangement being such that the first phase locked loop will be locked to a conversion frequency above or below the frequency of the signal source.

Abstract: A process for producing a citric acid soluble potassium silicate fertilizer comprises a step for kneading a mixture consisting essentially of potassium carbonate, fly ash, pulverized coal, other necessary starting materials and a caustic potash solution as a binder and then granulating the kneaded mixture, a step for drying the granulated product to a nearly absolutely dry state, and a step for calcining the dried granular product, whereby a chemical reaction takes place between the potassium and the silicon present in fly ash to convert them into a citric acid soluble potassium silicate.

Abstract: A girder or like structural element of the kind consisting of a pair of chords, which are usually parallel, and a web in the form of a zigzag strip consisting of oblique straights alternating with crests by which the web is joined to and between the chords by welding or otherwise, is characterized in that each of the crests is a flat of parallelogrammatic form and has the larger of the supplementary angles of the parallelogram at between 120.degree. and 150.degree.; and, each of the straights has its major cross-sectional dimension extending in a plane parallel to that of the chords or at least having a component parallel to the plane of the chords.

Abstract: In the regulation of a motor-drive unit for a motor vehicle having a heat-engine and a continuously variable ratio transmission, in a clutch-engaged phase the heat-engine fuel feed is controlled so that it is a function of the displacement of the accelerator pedal of the vehicle and of the speed of the heat-engine such that the power delivered by the engine is substantially equal to the power required for that displacement of the accelerator pedal. In addition, the transmission ratio is controlled so that the speed of the heat-engine approaches an ideal speed which depends upon the power required and is predetermined for operation of the motor-drive unit which is optimalized in accordance with a chosen criterion. Operation is thus obtained with, for example, minimum consumption or pollution while taking into account, in the transient phase, the operation desired by the driver.

Abstract: A circular array of detectors is used for detecting coincident events and the point of annihilation in a positron annihilation process in a selected plane wherein the output from the detectors is processed in a computer to provide image reconstruction for the selected plane. Bismuth germanate is shown to be more efficient than previously used detectors and the adaption of trapezoidal shape for the detectors enables more efficient utilization of the photons produced in the process. The use of absorbing metal reducing plugs between adjacent detectors may be used to decrease the aperture function of the detectors for low angles of incident radiation.

Abstract: The invention relates to the coloration of artificial or synthetic materials. There is used as disperse dyestuff a compound of the general formula: ##STR1## in which R.sub.1 represents a hydrogen atom or a nitro group, R.sub.2 represents a hydrogen or halogen atom or a nitro, trifluoromethyl, alkyl or alkoxy group and R.sub.3 represents a hydrogen or halogen atom or a cyano group.