Abstract: A method of obtaining uranium metal from an oxidized uranium compound, characterized in that the oxidized compound is treated with chlorine and carbon at a first stage, to obtain a chloride which is reduced by electrolysis or metallothermy using a reducing metal at a second stage.

Abstract: An eraser consisting of a body having an aperture. A cloth covering is mounted to a portion of the body. When a writing instrument is inserted in the aperture the writing instrument provides a handle by which the body may be manipulated.

Abstract: The disclosure describes a device for carrying and lifting loads and moving ame by aerodynamic lifting, rotary-wing aerial propulsion, having two coaxial rotors of same diameters rotating at the same speed and in reversed direction through a double crown wheel system which is driven by oppositely disposed rollers. The device includes a crown wheel operatively connected to two rotors which are driven by two rollers, one of which being driven by one or two motors mounted on the body. The internal crown wheel has a hub enabling external blades to be mounted in superimposed relationship.

Abstract: The photographic shutter has two curtains cut out of a sheet of synthetic material. The flexible return of the curtain is ensured by two drum springs engaging with pinions carried by the end of the rollers. The setting of the shutters may be effected by wheels which may be completely disconnected from the setting mechanism. Release may be effected electrically by electro-magnets.