The discrete sections 32 are spaced axially from one another by {TAIL ~ a core gap} 34 filled with {HEAD ~ a non magnetic gap filler} 78 
The discrete sections 32 are spaced axially from one another by { TAIL ~ a core gap } 34 filled with { HEAD ~ a non magnetic gap filler } 78
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH