On Electro-Dynamic Induction. 



137 



the same. During the time of the descent of the battery into 

 the hquid, the conductor connected with it is constantly receiv- 

 ing additional quantities of current electricity, and each of these 

 additions produces an inductive action on the adjoining secondary 

 conductor. The amount, therefore, of induced current produced 

 during any moment of time will be just in proportion to the cor- 

 responding increase in the current of the battery during the same 

 moment. Also, the amount of induction during any moment 

 while the current of battery is diminishing in quantity will be in 

 proportion to the decrease during the same moment. 



60. The several conditions of this experiment may be repre- 

 sented by the different parts of the curve, A, B, C, D, Fig. 17, in 

 which the distances, Aa, A6, Ac, represent the times during 

 which the battery is descending to ditFerent depths into the acid, 



Fig. 17. 



B 



^ a 



and the corresponding ordinates, ag, bh, cB, represent the amount 

 of current electricity in the battery conductor corresponding to 

 these times. The differences of the ordinates, namely, ag, mh, 

 ??B, express the increase in the quantity of the battery current 

 during the corresponding moments of time represented by Aa, 

 ab, be; and since the inductive actions (59) are just in proportion 

 to these increases, the same differences will also represent the 

 amount of induced action exerted on the secondary conductor 

 during the same moments of time. 



61. When the battery is fully immersed in the acid, or when 

 the current in the conductor has reached its state of maximum 

 quantity, and during the time of its remaining constant, no in- 

 duction is exerted ; and this condition is expressed by the con- 

 stant ordinates of the part of the curve BC, parallel to the axis. 

 Also, the inductive action produced by each diminution of the 

 battery current, while the apparatus is in the progress of being 

 drawn from the acid, will be represented by the differences of the 

 ordinates at the other end, CD, of the curve. 



62. The sum of the several increments of the battery current 

 up to its full development, will be expressed by the ordinate cB, 



Vol. XLi, No. 1.— April- June, 1841. 18 



