Thus {TAIL ~ the rotor} has advanced by one tooth pitch and is in {HEAD ~ the same state} as in FIG 3a except the polarities are reversed 
Thus { TAIL ~ the rotor } has advanced by one tooth pitch and is in { HEAD ~ the same state } as in FIG 3a except the polarities are reversed
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH