Abstract: Addition products of water-soluble sulfites or disulfites to maleic acid mono- or diesters of partially fluorinated alkanols or the mono-, di- or triethyleneglycol ethers of these alcohols are useful as surface active agents, especially as wetting agents, as levelling agents in wax emulsions or as dispersants.

Abstract: An electrical high-voltage apparatus wherein a plurality of resistor disks are arranged along and carried by a shaft and wherein a centering body is also arranged along the region of the shaft carrying the resistor disks. The centering body comprises first and second members which are movable relative to one another, and at least one of which has actuating edges. The centering body is further provided with several radially outward-pointing support elements which are distributed over the circumference of the body and which have radial inner chamfers which cooperate with the corresponding actuating edges of the one member.