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