In {HEAD ~ order} to improve the permeance and strengthen {TAIL ~ the magnetic flux density}, there exists a method of narrowing the breadth of a magnet across the circumference of the roller from a distance extending toward the center thereof 
to strengthen
In { HEAD ~ order } to improve the permeance and strengthen { TAIL ~ the magnetic flux density } , there exists a method of narrowing the breadth of a magnet across the circumference of the roller from a distance extending toward the center thereof
OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH