Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 205
lar poles, while the middle acquiresa polarity opposite to that of the ends. The middle,as well as the ends, will sustain a considerable weightof iron. By reversing the direction of the current,all the poles are reversed. The arrangement of thepoles may be shown by passing a magnetic needlealong… … STEEL MAGNETS CHARGED 189 venient for charging permanent magnets. A shortsteel bar, if applied like an armature to the polesof an electro-magnet of the U form, will becomestrongly magnetic, the end which was in contactwith the north pole acquiring south polarity. Alonger bar may be charged, by…
