Abstract: An amplifier system comprises a plurality of modules located within a cabinet in a manner providing minimum signal paths. The signal to be amplified is divided into frequency ranges for main amplification, and each main amplifier has an independent power supply. The modules are constructed from extrusions shaped and assembled to facilitate servicing and to function as heat sinks or as a cooling system as well as to provide mechanical protection and electrostatic shielding.

Abstract: A retroreflector plate and a method for its manufacture are described.The retroreflector plates consist of a transparent plate with a reflective rear side, the front side of which comprises adjacently disposed, curved light incidence surfaces, and the rear side of which comprises adjacently disposed, curved reflection surfaces, in which case the optical axis of each individual light incidence surface coincides with the optical axis of a respective reflection surface.The retroreflector plates are distinguished by the fact that, when the light incidence surfaces or the reflection surfaces are projected perpendicular and parallel onto the plate surface, as the plane of horizontal projection, the outlines of the reflection surfaces comprise different surface content, when compared with each other and with the light incidence surfaces, or, the outlines of the light incidence surfaces and their respective reflection surfaces substantially comprise the same surface content, while having different contour shapes.

Abstract: A vortex tube has a vortex generator portion in the form of a right circular cylindrical re-entrant cavity having end walls defining a right circular cylindrical volume therewithin with a nozzle means separating such volume from the remainder of the cavity. Pressurized air or other gas is introduced into the cavity through an appropriate coupling and is caused to swirl by the nozzle means to produce a vortex within such volume. A stream of higher temperature gas is coupled from one side of the vortex generator by a tube of given length and diameter smaller than the diameter of the vortex volume and a stream of lower temperature gas is coupled from the other side of the vortex generator through an opening of smaller diameter than the tube. Longitudinally extending grooves in the inner surface of the distal end portion of the tube enable a given temperature differential between the high and low temperature streams to be obtained with a tube of reduced length.

Abstract: The present invention relates to a process for preparing a polymer of the cross-linked polyurethane type, whereby(1) the following are reacted:(a) a polyolether, chosen from the group constituted by the oxyalkylene polyols (I) and mixtures thereof, obtained by condensation of a polyol (II) containing at least 2 OH groups and preferably 3 to 6 OH groups with an alkylene oxide (III) at a rate of 1 to 20 moles of (III) per free OH group of (II), and(b) a polyisocyanate (IV),the reaction being effected with an excess of OH groups of (I) with respect to the NCO isocyanate groups of (IV) to obtain a polyurethane-polyol (V) having free OH groups; and(2) the polyurethane-polyol (V) thus obtained is reacted with epichlorhydrin (VI) and a polyamine (VII) chosen from the polyamines having at least two NH.sub.2 amino groups and mixtures thereof. The invention also relates to this polymer as new industrial product and to its application as swelling agent.

Abstract: Novel N.sup.6 -adenosines according to formula I are disclosed. These novel compounds are useful as antihypertensive agents.

Abstract: The present invention provides a process for preparing high nutritive fibres from fish proteins which comprises grinding whole fish or fish pieces in the presence of water and then adding alkali to the ground fish. The alkali/fish mixture is then heated and cooled and the cooled mixture is then passed through a colloid mill thereby eliminating solid particles to obtain a protein solution. The solution is then injected through a spinneret into an aqueous acid medium causing the coagulation of the proteins into fibres. The fibres are then washed, set by heating and then neutralized. The fibres obtained by this process are also described.

Abstract: A hybrid-coil linear displacement transducer including a base having recesses in which are distributed a primary coil and two secondary coils having a different number of turns, wound scarf-joint fashion, connected in series and in opposition and arranged, at least partially, facing the primary coil, a coupling core moving between the primary and the secondary coils so as to cause the voltages at the terminals of the transformer's secondary coils to vary, wherein the secondary coils consist of two windings made of two wires wound simultaneously, at least one of these two windings being connected in series to a third coil constituting the secondary of an additional transformer of which the primary is connected in series to the primary of the hybrid coil.

Abstract: An eyeglass frame having open ended rims closed by screw assemblies for clamping lenses therein is disclosed. Each screw assembly comprises a machine screw having a head which defines a bearing surface, a nut threadedly engageable with the threaded shank of the screw, and integrally formed with a lug at one end of the open rim, and an insert member integrally formed with a lug at the other end of the open rim and having a cooperable bearing surface. Dog clutches are formed on the bearing surfaces and preferably comprise alternating projecting portions and recesses in an annular array. The dog clutches normally prevent loosening of the screw assembly by limiting the degree of relative angular displacement between the bearing surfaces, but the gap between the lugs and the resilience of the rims permits unscrewing of the assembly to remove the lens without damaging any of the parts of the assembly.

Abstract: A well notching tool having an elongated rotary power shaft and a coaxial shell in surrounding relationship therewith. A portion of the exterior shell surface is formed with an upwardly directed taper, and a portion of the exterior surface below the taper is formed with threads. A coaxial bell housing surrounds the shell and has internal threads cooperating with the threads on the shell for relative movement of the bell housing and the shell. The bell housing wall has upwardly directed passageways, and a slip is mounted in each passageway for movement in the passageway when contacted by the taper on the shell. A cutting assembly is located at the lower end of the power shaft to rotate with the power shaft. The cutting assembly includes pivotally mounted cutting tool arms actuated upon rotation of the cutting tool assembly to swing outwardly, and a cutting tool is carried at the end of each arm to cut a notch in the sidewall of a well bore.

Abstract: A process of and apparatus for liquefying a dry gas with low boiling point in a first circuit through heat exchange with a main refrigerating fluid in a second circuit itself pre-cooled to its at least partial liquefaction through heat exchange with an auxiliary refrigerating fluid in a third circuit, wherein, for a same amount of treated products, the required total compression input power for the refrigerating fluids is reduced by performing in said third circuit an intermediate condensation between the two last compression stages followed by a phase separation, the gaseous phase being compressed to a high pressure in the last compression stage whereas the liquid phase is compressed to a high pressure by a pump and recycled to a cryogenic heat exchanger for cooling the gas initially in the moist state thereby at least partially drying same.

Abstract: A screen wiper intended to be detachably fitted on the end of a wiper arm, comprises a harness having means for attachment of the harness to said arm, an elastically deformable elongated piece having means along a portion thereof towards one end for supporting a portion of a wiper blade, and a yoke pivotally mounted towards the other end of said elongated piece for supporting the portion of the blade rubber not carried by the said elongated piece. By mounting the blade in this manner the blade can undergo independant deformation on each side of the articulation point of the wiper arm, which eliminates practically all risk of lift-away such as can occur with known wipers when they encounter zones of great curvature.

Abstract: A control blood platelet preparation containing a population of platelets of known count range, electronic volume and electronic volume size distribution is used to check the threshold setting calibrations of an electronic particle counter. The control preparation preferably contains blood platelets from whole blood taken from animal species which are non-infectious with respect to human hepatitis, ideally animals of the bovine and parcine species.

Abstract: A method of anchoring a line, such as a pipeline, to a support, and in particular a sea-bed, comprises the steps, at each anchoring point, of drilling holes in the support on both sides of the line, bedding piles in these holes, passing at least one saddle clamp around the line, securing the ends of the saddle clamp to the piles, and injecting a filling material, which may be a settable material, into an inflatable body arranged between the line and the saddle clamp.Devices for carrying out the method are also described.

Abstract: A process for producing a cocoa powder mix characterized in that immediately before agglomeration, a dilute aqueous solution of cocoa aroma is sprayed onto a ground cocoa powder mixture in an amount below that which would impair the free flowing properties of the powder, after which the powder is agglomerated using steam or water and then dried.

Abstract: An apparatus is provided for the treatment of a liquid flowing substantially horizontally in a tank from an inlet area to an outlet area to make it possible to impose on the flow of the liquid, in a treatment area of the tank, a distribution of predetermined speeds according to the treatment. The liquid is introduced into the inlet area or is discharged from the outlet area in distinct streams on which is imposed a variable but predetermined rate of flow, depending on their location and the distribution of speeds which it is wished to impose on the liquid in the treatment area.

Abstract: A machine for simultaneously producing two continuous cigarette rods, in which two different units cooperate with each other to form the above two cigarette rods, the first of said units forming two equal strips of paper starting from a single continuous web, and the second of said units forming two substantially uniform and equal fillers of shredded tobacco starting from a single inlet hopper.

Abstract: An idling circuit for a carburation device comprises an idling duct for supplying a primary air-fuel mixture downstream of the throttle and a fueled-air line having an adjustable cross-section for circulating an additional quantity of air and primary mixture from upstream to downstream of the throttle. A solenoid valve is energized by pulses having a duty cycle which is controlled so as to keep the engine speed near a set idling speed and so as to increase the amount of mixture supplied to the engine during deceleration at high speed.

Abstract: A strip guiding device particularly suitable for being used with cigarette manufacturing machines for the automatic forward movement of at least a strip along a substantially U-shaped path, the said device comprising a hollow pulley around which a central curved section of the said path extends, at least a chamber disposed along the said path downstream with respect to the said pulley and suction means communicating with the said chamber and with the interior of the said hollow pulley, the walls of this latter which extend along the said path being perforated, and an air-permeable belt conveyor extending at least along the perforated wall of the said chamber.