Recent Discoveries in Magnetism and Klectricitt/. 363 



the electric ftuid in one direction, and another in an opposite 

 direction, as in the following wood-cut, those wires will repel 



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each other. In this circumstance, the dissimilarity of the 

 electro-magnetic and of simple electric phsenomena is observed ; 

 for bodies similarly electrified repel each other, and, dissimi- 

 larly electrified, attract each other ; but here the horizontal 

 wires, similarly electro-magnetized, attract; and, dissimilarly 

 electro-magnettzed, repel each other. — M. Ampere. 



4. The shock of a Leyden jar, or battery, passed through a 

 wire, confers upon it, at the moment of its passage, properties 

 precisely similar to those of the Voltaic apparatus. 



To render a steel bar magnetic, it is not necessary that it 

 should (ouch the conjunctive wire, to which it is attached at 

 right angles, for the electro-magnetic influence is conveyed to 

 some distance, and is not excluded by the interposition of a 

 plate of glass, of metal, or of water. — Sir H. Davy. 



5. The phaenomena, exhibited by the electro-magnetic, or con- 

 junctive wire, may be explained upon the supposition of an 

 electro-magnetic current passing round the axis of the conjunc- 

 tive wire, its direction depending upon that of the electric 

 current, or upon the poles of the battery with which it is con* 

 nected.D.'. Wollaston. 



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In the above figure, such a current is represented in two 

 sections at right angles to the axis of the wires, when similarly 

 electrified, from which it will be apparent that the north and 

 south powers meeting, will attract each other. 



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