Abstract: The invention relates to a gas laser generator. This generator comprises two flat energization lines having the shape of arcs of a half parabola, these lines being in electrical continuity along a common segment connecting the merged focusses of the half parabola arcs and a joint situated near the apexes of the half parabola arcs. Application to nitrogen laser generators.

Abstract: The invention relates to an electrolytic resistor comprising a water-repellent insulating tube through which there flows an alkaline solution containing a suspension of zinc. The positive end of the resistor has a metallic grid suitable for trapping the zinc particles, and the negative end has either an air electrode or a ring made of a metal having, more especially, high hydrogen supertension, this ring itself possibly having holes or projections suitable for promoting the progressive deposition of zinc dendrites. The invention is used in zinc-air storage cells.

Abstract: An extruded aluminum planar roofing shingle with a structural capability of spanning over six feet which incorporates an integral tube which projects from its lower surface, the shingles being mounted in edge overlapping, parallel array fashion across laterally spaced, inclined roof rafters of a building structure and being interlocked at said edges, each shingle extending the full length of the roof. Preferably, a light transmissive plate of a size corresponding generally to that of the shingle is carried by each shingle on the upper surface of the shingle and spaced therefrom to enhance heating of the extruded aluminum shingle and collection of solar heat thereby. A second layer may also be applied in such a manner that there is an insulation air space between each layer of the light transmissive plate.

Abstract: Uranium-235 is efficiently concentrated using a solution containing uranium-238 and uranium-235 by passing a solution containing uranium (VI) complex anions through a body of an anion exchange material to adsorb uranium (VI) complex anions on a portion of the anion exchange material and then passing a solution of a reducing agent through the anion exchange material thus retaining uranium in the form of the uranium (VI) complex anions to elute the uranium ions while reducing the uranium (VI) complex anions to uranium (IV) complex ions.

Abstract: A novel method for the spray application of an ablative material to produce a coating having low density, high tensile strength and improved char retension comprising spraying a composition of silicone resin, silicaceous fibers and hollow silicaceous microspheres in a solvent and curing to form an ablative coating having a density of 10 to 15 lbs/ft.sup.3.

Abstract: A microwave radiator in the form of a parallel plate transmission system with an array of radiating slots in one plate is used to transmit scanning planar radio beams. The radiating structure is shaped to form part or the whole of a cylindroid. The array of slots may be on the convex or concave side of the radiator, which is preferably curved in the plane of the axis of the beam. Scanning through 360.degree. is possible with a full cylindroid radiator having the array of slots extending over all its convex surface.

Abstract: A construction block of generally rectangular form having parallel upper and lower faces between which extend, through the block, one or more wide apertures and a plurality of narrow holes; the end faces of the block have wide grooves which cooperate, in a wall structure constructed from a plurality of horizontal courses of such blocks, to provide chambers between adjacent blocks of a course, the wide apertures in the blocks of adjacent courses cooperating to form vertically extending channels, the narrow holes house locating pins for holding the blocks of adjacent courses together until they are joined by concrete cast into the said vertical channels; the said upper and lower parallel faces have central depressions which form, between adjacent courses of blocks, horizontal channels linking the vertical channels so that the concrete cast into the vertical channels can also flow into and fill the horizontal channels to form an interlinked network giving great strength to the wall.

Abstract: A support suitable for spin coating which is transparent to near ultraviolet and visible light and has a flat surface to be coated, wherein the periphery of the surface is removed in an amount of at least the excess thickness at the periphery of a coated layer to be formed by spin coating so that the surface of the coated layer at the periphery is not raised as compared to the surface of the coated layer at the center. A mask blank which has a mask layer formed on the support is also disclosed as is a light-sensitive photographic material which has a silver halide emulsion layer formed on the support or the mask blank. The process is also claimed.

Abstract: The grinding machine is of the type adapted for grinding a workpiece having a surface of revolution such as a taper or barrel roller of a rolling element bearing. The two end faces of the workpiece are clamped between adjacent ends of two mandrels which are rotatable about a common axis. The adjacent ends of the two mandrels are formed with respective noses for effecting the clamping of the workpiece. One nose is formed with a seating in the form of a flat face or a concave surface of revolution the axis of which is coincident with the common axis of rotation of the two mandrels. The other nose is provided with a cavity having a tapered opening through which a spring loaded ball partially protrudes.

Abstract: A magnetic recording member comprising a non-magnetic support having thereon a magnetic layer of a ferromagnetic powder dispersed in a binder, wherein the magnetic layer contains an organic silicone compound represented by the formula (I): ##STR1## wherein R and R', which may be the same or different, each is a saturated or unsaturated hydrocarbon group containing 7 to 21 carbon atoms, and n is an integer of 0 to 50.

Abstract: A method of bearing a pivoting member on an axle which member is intended to transmit great forces between two other members. The pivoting member may constitute a load transmitting latch pivotable between an operative and inoperative position. The latch is mounted such that there is only a small clearance between a rear surface thereof and a complenetary surface of the associated holding member. The mounting permits shifting of the latch relative to its associated holding member such that the latch in the operative load carrying position is displaced in the longitudinal direction thereof through such a distance that the load transmitting direct contact engagement is obtained between the surfaces.

Abstract: A circuit for generating a saw tooth waveform in a coil such as the deflection coil of a television picture tube, comprising a first circuit branch including a capacitor serving as an energy storing current source and a controllable rectifier, and a second circuit branch including another current source, a second controllable rectifier and a resonant circuit comprising two reactances, constituted by an inductance and a capacitor which are connected in circuit by the second controllable rectifier and act to draw current from the two sources away from the deflection coil when the second controllable rectifier is fired whereby to initiate the flyback portion of the saw tooth waveform.

Abstract: A mixed propulsion system comprising a turbine unit having two output shafts which drive two counter rotating flywheels and, via a reduction gearbox, two generators which generate electricity to drive two electric drive motors the output shafts of which are connected to the wheels of the vehicle. A control system is provided, linked to the accelerator and brake pedal of the vehicle, for controlling the excitation of the field windings of the generators and the motors such that a predetermined excitation pattern is followed. The turbine unit is automatically controlled to run when the speed of the flywheels falls below a lower threshold value and is turned off when the flywheels reach a predetermined maximum threshold speed.

Abstract: A camera having a superimposing device for superimposing data such as date of photograph taking on a film surface, includes a mechanism for projecting such data in a viewfinder. The superimposing device includes a first optical path for projecting a light image of the object onto an eye-piece of the viewfinder, a second optical path for projecting a light image of the data onto the eye-piece at one predetermined portion thereof and means for forming background for the data projected in the eye-piece.

Abstract: The variator comprises a triggerable silicon-controlled rectifier component for connection in series with the a.c. motor to the a.c. source, and a phase-shifting circuit connected to the terminals of the rectifier component and comprising a capacitive branch and a resistive branch which has a regulating potentiometer. The junction between these two branches is connected to the control electrode of the rectifier component. A unidirectional semiconductor component responsive to voltage is connected in parallel with the capacitive branch and a part of the resistive branch in which the potentiometer is inserted. The resistive branch comprises connected in parallel a first branch comprising a first resistor and the potentiometer and a second branch comprising a second resistor and a third resistor. The junction between the second and third resistors is connected to the slide of the potentiometer and the unidirectional component is connected to the junction between the potentiometer and the first resistor.

Abstract: The device comprises a case of a material non-deformable under the effect of heat and mounted on the wall around at least a part of the tube. A mass of material capable of swelling under the effect of heat is enclosed in the case. An element of a material which is substantially non-fusible at temperatures which are developed in the course of a fire has a part which is planar and perpendicular to a radial direction relative to the tube and is movable and slidable in said radial direction in the case. The element normally bears on the outer surface of the tube and the mass of swelling material is disposed on the opposite side of the element to the tube.

Abstract: In a process for forming a resin body, the thickness of the body is altered by altering the feed rate of raw material to an extruder and the screw rate of the extruder screw in such a relationship to alter the quantity extrusion rate without altering the amount of resin within the extruder.

Abstract: A guide device for a sliding window in a vehicle has the usual central guide track for guiding the movement of a window support which is movable by means of a manual or powered winding mechanism, but to prevent rotation of the window about axes parallel to the surface of the window the guide track is tubular and has a longitudinal slot in which a cylindrical insert slides, the insert being connected through the slot to the movable window support.

Abstract: A spinning reel of the type having a bail arm and wherein an L-shaped kick lever rotating synchronously with the reel rotor engages a trip tab to thereby release the bail arm, further includes a braking surface immediately preceding the trip tab in the path of the projection. While the bail arm is cocked, slight rotation of the rotor due to eccentric weight distributions will be arrested when the braking surface frictionally engages the projection, thereby preventing premature and inadvertent release of the bail arm. The frictional engagement is relatively light, and may easily be overridden by turning the reel handle to thereby release the bail arm when desired.

Abstract: An image forming method comprising forming a silver image on a photographic material which comprises a substrate having a silver halide emulsion layer thereon by exposing and developing the photographic material and image-wise ion-etching away the layer to remove non-image areas of the emulsion layer, wherein the silver image is intensified or toned, if desired, before the ion-etching treatment.