Apparatus for measuring weak magnetic fields having superconducting connections between a squid array and a gradiometer array

Apparatus for measuring weak magnetic fields having a multiplicity of superconducting connections between a SQUID array arranged on a substrate provided with contact pads, and a gradiometer array, said superconducting connections comprising contact comb means comprising a plurality of flat substantially U-shaped spring contact means which are at least partially ssupeconducting and which are electrically insulated from each other and disposed with their flat sides parallel to each other and perpendicularly to the surface of the contact pads, said spring contact means forming a packet, said spring contact means having a first leg, a second middle leg and a third leg, the first leg of the spring contact means being provided with a first projection comprising a pressure contact for one of the contact pads, the middle leg of the spring contact means being provided with a second projection extending in the same direction as the first projection, said second projection being supported in a slot of an adjusting block means of electrically insulating material, said slot extending perpendicularly to the flat sides of the spring contact means and parallel to the plane of the contact pads, pressure plate means being provided for applying a force directed parallel to the flat sides of the spring contact means and perpendicularly to the surface of the contact pads against the third leg of said spring contact means.