{HEAD ~ The apparatus} 16, further including a permanent magnet to create {TAIL ~ a fixed magnetic flux field} 
{ HEAD ~ The apparatus } 16 , further including a permanent magnet to create { TAIL ~ a fixed magnetic flux field }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL