Abstract: A device having cores of metal oxide ceramic (for example, Y-Ba-Cu-O) for limiting a short circuit current in power supply systems. The concept provides that a choke core, when operated at a rated current, is superconductive and its shielding currents keep the resulting inductance in the choke at a low level. In the event of an overload, the winding of the choke generates a correspondingly high magnetic field in the core which puts the core into the normally conducting state. This causes the shielding currents to disappear in connection with a rise in the resulting inductance, thus limiting the current. In order to realize a particularly high inductance in the normally conductive case, the superconductive choke core may be made hollow and may be filled at least in part with a ferromagnetic material.

Abstract: A rough-ground camshaft has a shaft extending along and defining an axis and carrying a plurality of axially spaced cams each having a cam surface. This camshaft is finish-ground in system wherein for each cam there is a respective coarse prefinish tool and a respective fine finish tool. Every other cam surface is engaged in one diametrial direction by the respective coarse prefinish tool and in the opposite diametrical direction by the respective fine finish tool, and vice versa for the remaining cams, so that the prefinish tools, like the finish tools, alternate to opposite side of the camshaft axis. The camshaft is rotated about its axis and to start with all of the tools are urged against the respective cams, so that each cam is engaged in one diametrical direction by the respective prefinish tool and in the opposite direction by the respective fine finish tool. This shapes the tools, whereupon the fine finish tools are retracted for prefinishing of the cam surfaces.

Abstract: A method of preventing slag from escaping when emptying a pouring vessel with a bottom outlet. The vessel contains steel and slag. During the end phase of the emptying of the pouring vessel, between the discharge opening and the interior space of the vessel a barrier of liquid steel is built up by passing the steel through a system of communicating flow paths surrounding the discharge opening. Thus the steel is caused with the remainder of its content in the vessel prior to the discharge of this remainder from the vessel, due to its greater specific weight automatically to prevent the lighter slag from entering the system and to reach the discharge opening. The vessel for practicing the above mentioned method has its discharge opening surrounded by a groove-shaped recess, the lowermost portion of which is located below the level of the upper edge of the discharge opening. A wall annularly extends from above into the recess without contacting the lowermost portion of the recess.