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 160
B 8^===fqii!^ ATTRACTION OF ARMATURE. 143 227. Y-x1rmature.—This consists of a piece ofsoft irorij in the shape of the letter Y. If one of the Fig. 90. … branches of the fork be applied to thenorth pole of a horseshoe magnet, asseen in Fig. 90, the lower end of thearmature, and also the other branchof the fork, acquire north polarity,and will sustain small pieces of iron.If both branches of the fork be ap-plied, one to each pole of the magnet,as…
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