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On Electro-Dynamic Induction. 137 
the same. During the time of the descent of the battery into 
the liquid, 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, Ab, Ac, represent the times during 
which the battery is descending to different depths into the acid, 
Fig. 17. 
FS eee E ee ae Be D 
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, 
nB, express the increase in the quantity of the battery current 
during the corresponding moments of time represented by Aa, 
ab, bc; 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- 
uction is exerted; and this condition is expressed by the con- 
stant ordinates of the part of the curve BC, parallel to the axis. 
so, 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. xu1, No, 1.—April-June, 1841. 18 
