Abstract: Devices for discharging ground currents, more particularly in wind turbines, from electrical machines. The devices have a grounding ring mounted on a rotor of the electrical machine and a sliding contact connectable to ground and that is in contact with the grounding ring. The sliding contact element has a carbon brush with a bulk density between 1.1 and 1.4 g/cm3, and the carbon brush contains a metal inclusions composed of silver, the silver proportion being between 1 and 8%.

Abstract: The invention relates to a device for discharging ground currents, more particularly in wind turbines, from electrical machines, comprising a grounding ring mounted on a rotor of the electrical machine and a sliding contact which is connected to ground and is in contact with the grounding ring. The sliding contact element has a carbon brush with a bulk density between 1.1 and 1.4 g/cm3, and the carbon brush contains a metal inclusions composed of silver, the silver proportion being between 1 and 8%.

Abstract: A device capable of monitoring the drive shaft line of an agricultural implement which may be subjected to a high degree of irregularity in a manner whereby either instantaneous loads are transmitted to a tractor operator by analog or quasi-digital indications and adapted for inclusion of adjusting and control functions having a measuring shaft with a pair of toothed wheels arranged at opposite ends thereof with differential sensors provided in cooperative relationship with the toothed wheels to sense phase displacement between the toothed wheels proportional to torque occurring at the measuring shaft. Each of the toothed wheels is supported axially outwardly thereof by a pair of journals mounted in bearings of a housing which includes a resilient member for accommodating the device to bending forces.