Leak-detecting telephone cable

Claim 1

IN A TELEPHONE CABLE HAVING AN OUTER PROTECTIVE JACKET AND A MULTIPLICITY OF CONDUCTOR PARIS ENCLOSED WITHIN AND EXTENDING THROUGH SAID JACKET, EACH CONDUCTOR OF EACH PAIR BEING SURRROUNDING BY AN INSULATING LAYER OF NON-POROUS THERMOPLASTIC DIELECTRIC MATERIALS, MEANS FOR DETECTING LEAKS IN SAID CABLE COMPRISING AT LEAST ONE TWISTED PAIR OF DETECTOR CONDUCTORS ENCLOSED WITHIN AND EXTENDING THROUGH SAID CABLE, EACH OF SAID DETECTOR CONDUCTORS BEING SURROUNDED BY A LAYER OF NON-POROUS THERMOPLASTIC DIELECTRIC MATERIAL NORMALLY INSULATING IT FROM THE OTHER DETECTOR CONDUCTOR, THE INSULATING LAYERS ON THE DETECTOR CONDUCTORS BEING FORMED WITH SMALL CLOSELY SPACED OPENINGS ALONG THEIR ENTIRE LENGTH THROUGH WHICH THE SURFACE OF THE DETECTOR BEING FORMED WITH SMALL WHEREBY WHEN A VOLTAGE DROP IS IMPRESSED ADROSS THE TWISTED PAIR OF DETECTOR CONDUCTORS AND WATER ENTERS THROUGH A LEAK IN SAID CABLE THE DETECTOR CONDUCTORS ARE WETTED AND A CIRCUIT IS CLOSED BETWEEN THEM.