Certificate of correction

Claim 1

ZONE-MELTING APPARATUS COMPRISING MEANS FOR SUPPORTING AN ELONGATED CHARGE OF A MATERIAL TO BE SUBJECTED TO A ZONE-MELTING TREATMENT, AN ELECTRICALLY-CONDUCTIVE HEATING RING SURROUNDING AN AXIAL PORTION OF THE ELONGATED CHARGE, MEANS PERMITTING MOVEMENT OF THE SAID HEATING RING IN THE DIRECTION OF LENGTH OF THE CHARGE, AT LEAST ONE HIGH-FREQUENCY COIL, A SOURCE OF HIGH-FREQUENCY CURRENTS, MEANS CONNECTING THE SOURCE TO THE COIL TO ENERGIZE THE LATTER WITH HIGH-FREQUENCY CURRENTS TO ESTABLISH A FLUCTUATING ELECTROMAGNETIC FIELD AT THE RING FOR INDUCTIVELY HEATING SAME AND INCREASING ITS TEMPERATURE TO A VALUE AT WHICH RADIATION FROM THE RING WILL MELT A TRANSVERSE ZONE OF THE ELONGATED CHARGE, SAID HIGHFREQUENCY COIL BEING LOCATED RELATIVE TO THE HEATING RING SUCH THAT THE REGION OF MAXIMUM FIELD INTENSITY ESTABLISHED BY THE COIL IS SPACED FROM THE RING CENTER WHEREBY THE RING IS GENERALLY LOCATED IN A FIELD REGION OF LOWER INTENSITY, AND MEANS FOR ADVANCING THE COIL IN THE DIRECTION OF LENGTH OF THE CHARGE TO CAUSE THE HEATING RING TO BE TRANSLATED IN A DIRECTION OF A DECREASING FIELD GRADIENT SOLELY BY MEANS OF THE ELECTROMAGNETIC FIELD FORCES AND THUS TO CAUSE THE MOLTEN ZONE IN THE CHARGE TO BE SIMILARLY ADVANCED THROUGH THE CHARGE IN ITS LENGTH DIRECTION.