Shielding for a vacuum type circuit interrupter

Claim 1

AN ALTERNATING CURRENT CIRCUIT INTERRUPTER OF THE VACUUM TYPE COMPRISING: (A) AN EVACUATED ENVELOPE, (B) A PAIR OF ELECTRODES WITHIN SAID ENVELOPE HAVING A SPACED-APART POSITION DEFINING AN ARCING GAP THEREBETWEEN ACROSS WHICH AN ALTERNATING CURRENT ARC IS ESTABLISHED, (C) A TUBULAR VAPOR-CONDENSING SHIELD WITHIN SAID EVACUATED ENVELOPE SURROUNDING SAID ARCING GAP, (D) SAID TUBULAR SHIELD COMPRISING: (I) AN OUTER TUBULAR METAL MEMBER SURROUNDING SAID ARCING GAP AND HAVING SLOTS THEREIN EXTENDING LONGITUDINALLY THEREOF FOR SUBSTANTIAL DISTANCES ON LONGITUDINALLY OPPOSITE SIDES OF SAID ARCING GAP, (II) A TUBULAR INTERNAL LINER FOR SAID OUTER TUBULAR MEMBER GENERALLY ALIGNED WITH SAID ARCING GAP AND COMPRISING A PLURALITY OF DISCRETE METAL SEGMENTS SPACED-APART CIRCUMFERENTIALLY OF SAID LINER TO RENDER SAID LINER DISCONTINUOUS IN A CIRCUMFERENTIAL DIRECTION, (III) FASTENING MEANS FOR SECURING SAID SEGMENTS TO SAID OUTER TUBULAR MEANS IN RADIALLY SPACEDAPART RELATIONSHIP TO SAID OUTER TUBULAR MEMBER, (IV) SAID FASTENING MEANS BEING LOCATED BETWEEN EACH OF SAID SEGMENTS AND SAID TUBULAR MEMBER IN A POSITION BEHIND THE ASSOCIATED SEGMENT WITH RESPECT TO SAID ARCING GAP, (V) SAID FASTENING MEANS BEING OF A MATERIAL THAT HAS A HIGH RESISTIVITY IN COMPARISON TO THAT OF SAID SEGMENTS, (VI) SAID SEGMENTS COVERING SAID SLOTS TO PREVENT METAL VAPOR FROM SAID ARCING GAP FROM PASSING RADIALLY OUTWARD THROUGH SAID SLOTS.