TARAPAY. 



We m*j remark, bowerer, that although the fact of the tangential force 

 , electric current and a magnetic pole was clearly stated by Orated, 

 Uttriy ppwbended by Ampere, Wollaston, and others, the realization of 

 U owtinooai^tatto of the wire and the magnet round each other was a 

 requiring no mean ingenuity for its original solution. For on 



one band tbe electric current always forms a closed circuit, and on the 

 ^^ ^ two poles of the magnet have equal but opposite properties, and 

 re iMeparmbly connected, BO that whatever tendency there is for one pole to 

 drenkte round the current in one direction is opposed by the equal tendency 

 of the other pole to go round the other way, and thus the one pole can 

 dreg the other round the wire nor yet leave it behind. The thing 

 be done unless we adopt in some form Faraday's ingenious solution, by 

 the current, in some part of its course, to divide into two channels, 

 one on <ch side of the magnet, in such a way that during the revolution 

 of the magnet the current is transferred from the channel in front of the 

 to the channel behind it, so that the middle of the magnet can pass 

 the current without stopping it, just as Cyrus caused his army to pass 

 dryibod over the Gyndes by diverting the river into a channel cut for it in 

 hi* rear. 



We must now go on to the crowning discovery of the induction of electric 



. 



In Dec. 1824 he had attempted to obtain an electric current by means 

 of a magnet, and on three occasions he had made elaborate but unsuccessful 

 attempts to . produce a current in one wire by means of a current in another 

 wire or by a magnet He still persevered, and on the 29th August, 1831, he 

 obtained the first evidence that an electric current can induce another in a 

 different circuit On September 23 he writes to his friend R. Phillips " I am busy 

 just now again on electromagnetism, and think I have got hold of a good 

 thing, but can't say. It may be a weed instead of a fish that, after all 

 my labnr, I may at last pull up." This was his first successful experiment. 

 In nine more days of experimenting he had arrived at the results described 

 in hifl first series of "Experimental Researches" read to the Royal Society, 

 November 24, 1841. 



By the intense application of his mind he had brought the new idea, in 

 lew than three months from its first development, to a state of perfect maturity. 

 The magnitude and originality of Faraday's achievement may be estimated by 



