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