FIG 5 illustrates the magnetic lines of force on a device constructed according to {HEAD ~ principles} of {TAIL ~ the invention} 
FIG 5 illustrates the magnetic lines of force on a device constructed according to { HEAD ~ principles } of { TAIL ~ the invention }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL