500 



Prof. J. Henry's Contributions 



rent of the battery is diminishing in quantity will be in pro- 

 portion to the decrease during the same moment. 



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

 presented by the different parts of the curve, A, B, C, D, 

 fio-. 17, in which the distances, Art, Ab, Ac, represent the 

 times during which the battery is descending to different 

 depths into the acid ; and the corresponding ordinates, a g,b //, 

 c B, represent the amount of current electricity in the battery 

 conductor corresponding to these times. The differences of 

 the ordinates, namely, ag, m h, n B, express the increase in 

 the quantity of the battery current during the corresponding 

 moments of time represented by A a, ab, be; and since the 

 inductive actions (59.) are just in proportion to these increases, 

 the same differences will also represent the amount of in- 

 duced action exerted on the secondary conductor during the 

 same moment of time. 



Fig. 17 



61. When the battery is fully inmiersed in the acid, or 

 when the current in the conductor has reached its state of 

 maximum quantity, and during the time of its remaining con- 

 stant, no induction is exerted ; and this condition is expressed 

 by the constant ordinates of the part of the curve B C, parallel 

 to the axis. Also, the inductive action produced by each di- 

 minution 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, C D, of 

 the curve. 



62. The sum of the several increments of the battery cur- 

 rent, up to its full development, will be expressed by the or- 

 dinate c B, and this will, therefore, also represent the whole 

 amount of inductive action exerted in one direction at the 

 beginning of the primary current; and, for the same reason, 

 the equal ordinate, C d, will represent the whole induction in 

 the other direction at the ending of the same current. Also, 

 the whole time of continuance of the inductive action at the 

 beginning and ending will be represented by A c and r/ D. 



63. If we suppose the battery to be plunged into the acid 

 to the same depth, but more rapidly than before, then the 

 time represented by Ar will be diminished, while the whole 



