Abstract: The present invention concerns superconductor lengths constituted by superconducting filaments based on a ternary chalcogenide of molybdenum (PbMo.sub.6 S.sub.8) assembled within a stabilizing matrix based on copper. The invention provides a method of fabricating superconducting filaments consisting of mixing a powder of a ternary chalcogenide of molybdenum with a metal powder of smaller granulometry and chosen from the components of the chalcogenide in question, or from the group of metals consisting of aluminum, silver, gallium, rhenium, and titanium, in sheathing the mixture of powders obtained by means of a metal wall constituted from one of a group of metals formed by molybdenum, niobium, tantalum, titanium and vanadium, and in subjecting the superconducting lengths obtained after drawing and cold working using conventional wire drawing techniques to a final heat treatment consisting of heating to a temperature of about 800.degree. C. for at least twenty hours.

Abstract: A superconductive switch having a high operating rhythm. The superconductive material in a thin layer is cooled by a permeable fibre glass strip which brings the cryogenic fluid into contact with it. Application to the feeding of a device by successive discharges of a superconductive storage winding.

Abstract: Superconductive lead having several crossed or transposed filaments. A copper deposit, a superconductive deposit, a copper deposit, are formed successively on the surface of a support to constitute parts of stabilized filament, cupronickel deposits and further parts of stabilized filaments, to constitute several continuous filaments crossing one another and being electrically uncoupled from one another in the crossing zones by the insulating cupronickel deposits.