etween distributed in the curved directions, and 12° and 90°. The curves of values that with the unequal density which this dis- satisfy his equations have minima exactly position of the field magnets presents. in those regions where his experiments The remedy is obvious ; arrange a more revealed… … If an iron core be substituted for the wooden core the useful induction is greater and the false induction less ; there is still an inversion, but it takes place at about 25° from the pole, and is quite trifling in amount. The introduc- tion of iron pole pieces extending in two nearly semi-circular…
Engineering
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