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 fact which is in accordance with all the experiments, (9, 13, 
73, T4, 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, r he 
same, however the intensity of the electricity or the len, 
conductor may be varied. 
Pige18. 
a b 
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. . 
Cc 
BZN Cc 
Ab aS k D 
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. 
: 
“ ¥ 
Cc. D a P 
