1. APPARATUS FOR WRAPPING STRIP MATERIAL WHICH COMPRISES A MANDREL AROUND WHICH SAID STRIP MATERIAL IS TO BE WRAPPED; SUPPLY MEANS FOR SUPPLYING SAID STRIP MATEERIAL UNDER TENSION TO SAID MANDREL UNDER A PREDETERMINED HELIX ANGLE SUCH THAT THE STRIP WINDINGS HAVE OVERLAPPING RELATIONSHIP WITH ONE ANOTHER AND DEFLECTING MEANS ENGAGING THE PORTION OF THE STRIP MATERIAL BETWEEN SAID SUPPLY MEANS AND SAID MANDREL, TO EFFECT REDISTRIBUTION OF THE TENSION IN SAID STRIP MATERIAL, SAID DEFLECTING MEANS BEING SO CONSTRUCTED AND ARRANGED THAT THE TRAILING EDGE PORTION OF THE STRIP MATERIAL IS DEFLECTED MORE THAN THE LEADING EDGE PORTION, WHEREBY CORRESPONDINGLY GREATER TENSION IS APPLIED TO THE TRAILING EDGE PORTION THAN TO THE LEADING EDGE PORTION, PRODUCING A CORRE-