Abstract: This invention concerns a device for maintaining a separation between two electric conductors. A dielectric spacer comprises, in the vicinity of at least one conductor, a portion having high permittivity. Application to the increase in the voltages which coaxial electric power conveying cables can withstand.

Abstract: Low density polyethylene with a very small proportion of low molecular weight polyethylene (e.g. such as can be extracted by washing by ethanol) is used as an insulation material for high voltage power cable.

Abstract: Concentric closed tubes define an outer steam vessel with the inner tube constituted by a selective membrane consisting of a metallic oxide having a first doping to effect passage of oxygen ions through the membrane to the interior of the inner tube acting as an oxygen collector and having a second doping to effect return conduction of electrons through said membrane to increase heating of the steam. A vacuum pump is applied to the interior of the inner tube to provide a pressure differential to facilitate oxygen passage through the membrane.