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 174
gh thewhole length of the bar; but in consequence of theirmutual reactions, the resultant polarities are strongestnear the ends of the bar, becoming more and morecompletely neutralized towards the middle. 250. Artificial magnets were formerly made byinduction from strong magnets previously… … 158 DAVISS MANUAL. to a bar or needle, were most efficacious in com-municating or developing the magnetic power; and,accordingly, various and complicated arrangementsand manipulations for this purpose, are detailed inold treatises on the science. Recently, other and farmore powerful means have been…
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