Abstract: Apparatus for seeking and following a luminous zone, such as the sun, comprises an element angularly movable about mutually perpendicular axes. The element carries photoelectric transducers facing in different directions and which control servomotors for positioning the element to face the luminous zone in accordance with differential signals produced by the transducers.

Abstract: A machine for constructing a chain of metallic shaped links from a continuous wire including:means for shaping the wire in the form of a cylindrical wire spiral; means for gripping the first free turn of the spiral; means for cutting away the first spiral turn and associated with shaping means to urge the ends of the first turn to approach to one another, to form a chain link; shaping means to impart the desired configuration to the chain link; welding means to weld the ends of the chain link; and control means to move into the operative or inoperative positions and to make operative or inoperative in a predetermined time sequence and at desired times the various means composing the machine.

Abstract: A machine for preparing and introducing closure sliders inside annular hollow members for producing spring safety catches for necklaces and the like, consisting of two operative unitsets, each comprising a table rotatably mounted about a vertical axis and actuated by means for rotating the table intermittently through angles of 90.degree. and carrying four radially reciprocating pliers units spaced apart from each other of 90.degree.

Abstract: A process for producing articles of jewelry, trinketry and the like, such as rings, necklaces, bracelets and the like starting from a composite tubular element made of different elements, characterized by the fact that it comprises the following steps of:Drawing a plurality of hollow tubular elements, each made of a metal of a different color or color tonality and each having an outer diameter slightly less than the inner diameter of another of said elements, while the element of the smallest outer diameter has a solid cross section;Inserting said tubular elements into each other in order to obtain a multi-layer composite tubular element having adjacent layers of different colors or color tonalities;Drawing said composite multi-layer element until the various adjacent tubular components perfectly adhere to each other;Cutting sections of the desired lengths from the composite elements obtained in preceding the step;Shaping each length of said composite element according to the desired configuration, optionally