Device for indicating the ceasing of super-conductivity

Claim 1

IN A CIRCUIT INCLUDING A SUPER-CONDUCTOR, MEANS FOR PROTECTING SAID SUPER-CONDUCTOR IN CAE OF CESSATION OF SUPER-CONDUCTIVELY, SAID SUPER-CONDUCTOR HAVING A FIRST AND SECOND END TERMINALS AND ENCLOSING A MAGNETIC FLUX GENERATED BY A CURRENT THROUGH SAID SUPER-CONDUCTOR, SAID DEVICE INCLUDING A NON-SUPER-CONDUCTOR CONDUCTOR ARRANGED TO FOLLOW SAID SUPER-CONDUCTOR CLOSELY BUT ELECTRICALLY INSULATED THEREFROM BETWEEN SAID TERMINALS, SAID NON-SUPER-CONDUCTING CONDUCTOR HVING FIRST AND SECOND END POINTS, SAID FIRST TERMINAL BEING ELECTRICALLY CONNECTED TO SAID FIRST END POINT, A VOLTAGE SENSING MEANS CONNECTED BETWEEN SAID SECOND END TERMINAL AND SAID SECOND END POINT, A SWITCHING DEVICE IN SAID SUPER-CONDUCTOR CIRCUIT, SAID VOLTAGE SENSING MEANS BEING OPERATIVELY CONNECTED TO SAID SWITCHING DEVICE TO INITIATE PROTECTIVE ACTION IN RESPONSE TO A PREDETERMINED VOLTAGE DIFFERENCE BETWEEN SAID SECOND TERMINAL AND SAID SECOND END POINT, SAID SWITCHING DEVICE THEREUPON FIRST CONNECTING TOGETHER SAID END POINTS OF SAID NON-SUPER-CONDUCTING CONDUCTOR AND THEREAFTER BREAKING SAID CURRENT IN SAID SUPER-CONDUCTOR.