Electromagnetic transducers

Claim 1

AN ELECTROMAGNETIC TRANSDUCER FOR RECORDING INTELLIGENCE ON A MAGNETIZABLE MEDIUM AND FOR READING INTELLIGENCE THEREFROM, SAID TRANSDUCER COMPRISING: A SUBSTANTIALLY FLAT MAGETIC CORE FORMING A CLOSED MAGNETIC LOOP AND COMPRISING TWO UNSYMMETRICAL SECTIONS OF UNEQUAL LENGTHS DISPOSED SUBSTANTIALLY IN ONE PLANE, EACH ONE OF SAID SECTION HAVING FIRST END SURFACES ABUTTING EACH OTHER AND SECOND END SURFACES SEPARATED BY A THIN SLIVER OF NON-MAGNETIC MATERIAL TO PROVIDE A MAGNETIC FLUX DEFLECTING GAP ECCENTRIC RELATIVELY TO THE CENTER LINE OF SAID MAGNETIC CORE; A SIGNAL COIL SURROUNDING PART OF SAID MAGNETIC CORE PROXIMATE THE TWO ABUTTING END SURFACES, SAID COIL BEING PROVIDED WITH TERMINAL WIRES; A SUBSTANTIALLY CYLINDRICAL RETAINER OF NON-MAGNETIC MATERIAL PROVIDED WITH A LONGITUDINAL SLOT ON ONE END THEREOF PROXIMATE THE MAGNETIC FLUX REFLECTING GAP OF THE MAGNETIC CORE AND EXTENDING RADIALLY BEYOND THE AXIS OF SAID RETAINER AND WITH A POCKET PROXIMATE THE SIGNAL COIL, SAID SLOT AND SAID POCKET BEING ADAPTED TO HOLD SNUGLY THE MAGNETIC CORE AND THE SIGNAL COIL RESPECTIVELY, WITH SAID CORE HAVING ITS MAGNETIC FLUX DEFLECTING GAP SUBSTANTIALLY FLUSH WITH ONE END OF SAID RETAINER; SAID SLOT IN SAID RETAINER AND SAID MAGNETIC CORE BEING RELATIVELY DIMENSIONED AND ARRANGED SO THAT THE SLOT IN SAID RETAINER IS ADAPTED TO HOLD THE MAGNETIC CORE WITH ITS FLUX DEFLECTING GAP ALIGNED SUBSTANTIALLY WITH THE LONGITUDINAL AXIS OF SAID RETAINER IN A FIRST MODE OF ASSEMBLY, SAID SLOT IN SAID RETAINER BEING ADAPTED TO HOLD THE MAGNETIC CORE WITH ITS FLUX DEFLECTING GAP SUBSTANTIALLY ECCENTRIC TO SAID LONGITUDINAL AXIS IN A SECOND MODE OF ASSEMBLY WHEREIN SAID MAGNECTIC CORE IS SITUATED IN A PLANE ROTATED 180* AROUND THE CENTER LINE OF SAID MAGENTIC CORE RELATIVELY TO THE PLANE IN WHICH SAID MAGNETIC CORE IS DISPOSED IN SAID FIRST MODE OF ASSEMBLY; A TERMINAL BLOCK OF INSULATING MATERIAL FASTENED TO THE OTHER END OF THE RETAINER IN ALIGNMENT THEREWITH AND COMPRISING A SLOTTED PASSAGEWAY FOR THE COIL TERMINAL WIRES, SAID TERMINAL BLOCK HAVING BINDING PINS ON ITS FREE END FOR CONNECTION THEREON OF SAID WIRES; AND A POTTING MATERIAL FOR MAINTAINING THE DIVERSE ELEMENTS SECURELY IN POSITION.