Abstract: An electrical sliding contact switch comprises a contact transmitter element with a first and a second rigidly interconnected sliding contact, which are pressed against a corresponding surface designed for a common sliding section by respective contact areas in the same direction, while there is an insulated segment and a contact segment for each sliding contact within the common sliding section respectively, whereby one insulated segment is slid over by a contact area of a sliding contact, when the corresponding other sliding contact is sliding over its contact segment with its contact area, whereby a notch is arranged within the insulating segment which is slid over by a contact area of a sliding contact in case the other sliding contact is sliding over its contact segment.

Abstract: An electrical sliding contact switch comprises a contact transmitter element with a first and a second rigidly interconnected sliding contact, which are pressed against a corresponding surface designed for a common sliding section by respective contact areas in the same direction, while there is an insulated segment and a contact segment for each sliding contact within the common sliding section respectively, whereby one insulated segment is slid over by a contact area of sliding contact, when the corresponding other sliding contact is sliding over its contact segment with its contact area, whereby a notch is arranged within the insulating segment which is slid over by a contact area of a sliding contact in case the other sliding contact is sliding over its contact segment.

Abstract: A method and device for setting up a virtual electronic teaching system with individual interactive communication is proposed. Various methods and devices for carrying out tele-teaching or e-learning sessions have been previously suggested. These methods and devices are improved in such a manner that work stations that can be freely interlinked and individual interactive communication can be set up at low cost. Towards this end, a telecommunication network is used that comprises a main distribution frame linked with an exchange (VST). An access multiplexer and/or a splitter are connected to the main distribution frame or are integrated into the main distribution frame. Analog or digital telecommunication systems (TE) are connected via an interface circuit (SS). When the connection is set up, at the transmitter end, the kind of connection available to the interface circuit (SS) is determined.

Abstract: A meteorological electromagnetic measuring system contains a plurality of measuring stations which are physically distributed in a given area. Each measuring station contains at least one spherics receiver to pick up spherics signals and a transmission device to transfer measuring data available in the measuring station and derived from the spherics signals to a central evaluation unit assigned to the measuring stations. The measuring stations are disposed such that an average distance between adjacent measuring stations is less than 50 km for area wide detection of short-range spherics signals.