This cannot be permitted since it is necessary to apply a voltage of opposite polarity to {HEAD ~ the transformer T1} to achieve {TAIL ~ demagnetization} 
to achieve
This can not be permitted since it is necessary to apply a voltage of opposite polarity to { HEAD ~ the transformer T1 } to achieve { TAIL ~ demagnetization }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL