In the magnet 36 shown in FIG 3, the magnetic pole pieces 38a, 38b, and 38c are symmetrically arranged around channel 34 using {TAIL ~ permanently magnetizable iron} or the like with individual coils wrapped around each pole piece, as shown by coils 40a, 40b and {HEAD ~ 40c}, to initially magnetize each of the pole pieces to a desired permanent magnetization 
In the magnet 36 shown in FIG 3 , the magnetic pole pieces 38a , 38b , and 38c are symmetrically arranged around channel 34 using { TAIL ~ permanently magnetizable iron } or the like with individual coils wrapped around each pole piece , as shown by coils 40a , 40b and { HEAD ~ 40c } , to initially magnetize each of the pole pieces to a desired permanent magnetization
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