The flux from an in circuit permanent magnet is varied as the relative movement between {HEAD ~ opposed teeth} of {TAIL ~ sensor} and platen changes 
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The flux from an in circuit permanent magnet is varied as the relative movement between { HEAD ~ opposed teeth } of { TAIL ~ sensor } and platen changes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH