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