1. A COLLECTOR RING ASSEMBLY FOR CONDUCTING ELECTRICAL POTENTIAL FORM A SOURCE TO A CONDUCTOR ROTATABLE WITH RESPECT TO SAID SOURCE, COMPRISING: A PLURALITY OF SIMILAR, ELECTRICALLY NONCONDUCTIVE AND ANNULAR MEMBERS ARRANGED IN SIDE-BY-SIDE ABUTTING RELATION, EACH NONCONDUCTIVE MEMBER HAVING A CYLINDRICAL BODY AND AN EXTERNAL, ANNULAR FLANGE NEAR ONE AXIAL SIDE THEREOF AND A PAIR OF OPENINGS EXTENDING AXIALLY THERETHROUGH, ONE OF SAID OPENINGS BEING CENTRALLY LOCATED AND THE OTHER OF SAID OPENINGS BEING SPACED NONCONDUCTIVE MEMBER HAVING A PLURALITY OF EACH NONCONDUCTIVE MEMBER HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED PROJECTIONS ON ONE AXIAL SIDE THEREOF AND A PLURALITY OF CORRESPONDING RECESSES ON THE OTHER AXIAL SIDE THEREOF, THE PROJECTIONS ON ONE NONCONDUCTIVE MEMBER BEING SNUGLY AND SLIDABLY RECEIVABLE INTO THE RECESSES ON ANOTHER NONCONDUCTIVE MEMBER TO PREVENT RELATIVE RADIAL AND ROTATIVE MENT OF THE TWO MEMBERS, AND EACH NONCONDUCTIVE MEMBER HAVING A RADIALLY DISPOSED OPENING EXTENDING THROUGH THE PERIPHERAL SURFACE THEREOF AND COMMUNICATING WITH SAID OTHER OPENING THEREIN; HOLDING MEANS INCLUDING A PAIR OF ANNULAR END MEMBERS HOLDING SAID NONCONDUCTIVE MEMBERS TOGETHER AND AGAINST AXIAL MOVEMENT AWAY FROM EACH OTHER; AN ELECTRICALLY CONDUCTIVE ANNULAR RING OF RELATIVELY SMALL RADIAL THICKNESS SNUGLY EMBRACING AND ENCIRCLING THE CYLINDRICAL PORTION OF EACH OF SAID NONCONDUCTIVE MEMBERS AND SNUGLY DISPOSED BETWEEN THE FLANGE THEREOF AND THE FLANGE OF THE ADJACENT NON-CON DUCTIVE MEMBER; FRAME STRUCTURE INCLUDING A PAIR OF ANNULAR SUPPORT MEMBERS RESPECTIVELY ENCIRCLING SAID END MEMBERS AND A PLURALITY OF RIGID, SPACED AND PARALLEL ELEMENTS EXTENDING BETWEEN AND CONNECTED TO SAID SUPPORT MEMBERS; BRUSH SUPPORT MEANS SUPPORTED UPON AT LEAST ONE OF SAID ELEMENTS, AND BRUSH MEANS HELD BY SAID SUPPORT MEANS FOR ELECTRICALLY CONDUCTIVE ENGAGEMENT WITH EACH OF SAID RINGS.