Abstract: The electrically-conductive element, in particular for a rotary collector, for transferring electrical current between two parts (2, 24) that are movable relative to each other is covered in one or more layers of electrically-insulating enamel (42), with the exception of an electrical continuity zone (43). The layer(s) of enamel (42) is/are removed, e.g. by chemical, thermal, or mechanical attack. The enamel (42) is selected from the group comprising: polyvinyls, polyurethanes, polyesters, polyester imides, polyamide imides, and polyimides. The layers may be the same or different in chemical nature.

Abstract: The electrically-conductive element, in particular for a rotary collector, for transferring electrical current between two parts (2, 24) that are movable relative to each other is covered in one or more layers of electrically-insulating enamel (42), with the exception of an electrical continuity zone (43). The layer(s) of enamel (42) is/are removed, e.g. by chemical, thermal, or mechanical attack. The enamel (42) is selected from the group comprising: polyvinyls, polyurethanes, polyesters, polyester imides, polyamide imides, and polyimides. The layers may be the same or different in chemical nature.

Abstract: A defect detecting device for checking by light reflection parts constituted by a substrate covered with a clear coat. The device includes a reference surface wherein the inspected parts are located; a polychromatic spotlight whose light beam direction intercepts the flat reference surface in an observation area, the light beam direction forming an angle larger than .pi.-.beta., where .beta. is the BREWSTER angle, with the flat reference surface; a viewing apparatus whose optical axis is in the same plane as the light beam direction, the axis forming an angle larger than .pi.-.beta.