Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 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. 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 both branches of the fork be ap-plied, one to each pole of the magnet,as shown
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 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. 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 both branches of the fork be ap-plied, one to each pole of the magnet,as shown by the dotted lines in thecut, the polarity of the lower end im-mediately disappears. This is be-cause the two poles tend to induceopposite polarities of equal intensity inthe extremity of the armature, whichof course neutralize each other. If the branches ofthe fork are applied to the similar poles of two mag-nets, their influence will conspire in inducing thesame polarity in the lower end, and a greater weightwill be supported by it, than when one branch isapplied to a single pole. 228. When the two extremities of an iron bar arescted upon at once by both poles of a magnet, thereis a double induction, and the effect is greatly in-creased. Thus, let N S (Fig. 91) be a compoundU-magnet, a
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
