290 



LOCALIZED ELECTRIZATION. 



Fig. 70. — Theory of tbe arrangement. 



negative arc, a m h', does not occur so suddenly as is here indi- 

 cated, because the extremities of the reels and of the magnets 

 are not mathematical points, but possess considerable transverse 

 dimensions. We shall return hereafter to this question. 



" We may say at once, although it is foreign to the subject of 

 Pixii's apparatus, that, if we cause the current engendered to act 

 upon a second circuit, we obtain an induced current, which will be 

 an induced current of the second kind, caused by magnetic induc- 

 tion, and the distribution of which is shown in fig. 71. 



" In this figure the upper curve is an ideal representation of the 

 intensity of the current consequent upon the variations of distance 



between the reels and 

 the magnets, and is 

 such as would be ob- 

 tained by taking no- 

 thing but these varia- 

 tions into account; it 

 presents a perfectly 

 symmetrical outline. 

 But this variable cur- 

 rent, being able to in- 

 duce a second circuit, 

 will induce its own in 

 such a manner that we 

 shall have very nearly 

 the true curve of the 

 intensities of the cur- 

 ,,. ^, T,, rn .« rent of the reels by 



Fig. 71. — Theory of the arrangement.'' ±^.^yj ^ ^ j 



* The upper trace shows tlie current I The lower trace, the induced current, 

 induced in the reels of Pixii's instrument. | caused by a second circuit. 



