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BELL SYSTEM TECHNICAL JOURNAL 



Fig. 5 — Typical magnetization curve for steel. 



POLARIZING 

 POLES 



RECORDING 

 POLES 



LENGTH OF TAPE 



Fig. 6 — Perpendicular magnetization method of recording on steel tape. 

 SIG = Signal coil; P = Polarizing coil; DP = Depolarizing coil. 



