The south pole on tooth 1 is allowed to decay, {HEAD ~ the diminution} occurring at {TAIL ~ a rate} depending on the hysteresis of the rotor material 
occurring at
The south pole on tooth 1 is allowed to decay , { HEAD ~ the diminution } occurring at { TAIL ~ a rate } depending on the hysteresis of the rotor material
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH