Abstract: An apparatus is provided for measuring the test current in magnetoelectric fault detection, for instance by the magnetic particle method. A sensor comprising a Hall generator or a magnetoresistor is movably mounted on a diamagnetic support which clamps the sensor at a variable distance from a conductor carrying the test current. Alternatively, a plurality of sensors can be fixed to the support and the appropriate sensor selected for use.

Abstract: To permit use of essentially circular, disk-like engagement elements (8) in a free-wheeling clutch, which can rotate to permit one-way free-wheeling operation while interfering with relative free rotation in the other direction, a coil spring (7) with two projecting spring arms (7a, 7b) is located in a recess of a radial surface (5) formed in an opening (2) in the cage ring, and the ring as well as the engagement elements are formed additionally with first and second cooperating surface pairs (3a, 8d; 4c, 8c) located at different diametrical dimensions with respect to a pivot axis of the engagement element, the spring arms (7a, 7b) engaging against essentially radially--with respect to the pivot axis--extending transition engagement surfaces (8e, 8f) between the respective different diametrical, essentially circular surfaces of the engagement element.