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