On Electro- Dynamic Induction. 



141 



the galvanic current, leaves the constant current in the conduc- 

 tor nearly in the same state of quantity as that which would be 

 produced by a battery of a single element ; and hence the con- 

 ditions of the ending of the current are the same in both cases. 

 Indeed, in reference to the ending induction, it may be assumed 

 as a feet which is in accordance with all the experiments, (9, 13, 

 73, 74, 75, 76, &c.,) as well as with theoretical considerations,* 

 that when the circuit is broken by a cup of mercury, the rate of 

 the diminution of the current, within certain limits, remains the 

 same, however the intensity of the electricity or the length of the 

 conductor may be varied. 



Fig. 18. 



+ 



70. The several conditions of the foregoing examples are ex- 

 hibited by the parts of the curves. Figs. 18 and 19. The gradual 

 development of the current in the short conductor, with a single 

 battery, and the gradual decline of the same, are represented by 

 the gentle rise of AB and fall of CD, Fig. 18 ; while, in the next 

 Fig. (19,) the sudden rise of AB indicates the intensity which 

 produces the increased shock, after the number of elements of 

 the battery has been increased. The accumulation of the elec- 

 tricity, which almost instantly subsides, is represented by the 

 part Bee, Fig. 19, and from this we see at once, that although the 



Fig. 19. 



A h d f 



shock is increased by using the compound battery, yet the needle 

 of the galvanometer will be deflected only to the same number 

 of degrees, since the parts Be and ce give inductive actions in 



See the theory of Ohm. 



