"Niagara Jfalte power 8pplfance0. 203 



1 with the two poles of the battery and 

 bring them together so as to close the circuit, 

 and then separate them so as to break it we 

 should scarcely feel any sensation if there 



only one or two cells, such as are ordi- 

 narily used with such coils. But if we con- 

 nect these wires to the coils of the induction 

 apparatus and then take hold of the two ends 

 of the secondary coil and break and close the 

 primary circuit we should feel a painful shock 

 at each break and close, although the actual 

 amount of current flowing through the sec- 

 ondary wire is not as great as that which flows 

 through the primary; but the voltage (or elec- 

 tromotive force) is higher, and thus is able 

 in drive what current there is through a con- 

 ductor of higher resistance, such as the human 

 body. For this reason there is more current 

 forced through the body, which is a poor con- 

 ductor, than can be by a direct battery current 

 which has a lower voltage. If now we should 

 a battery of a number of cells, so as to 

 get a voltage equal to that given off by the 

 secondary coil, and connect it with the fine- 

 coil instead of the coarse-wire coil thus 

 making what was before the secondary coil the 

 primary by breaking and closing the battery 

 circuit as l<-f..iv we shall get a secondary or 

 induced current in the ire coil, but it 



will be a current of low voltage, and will not 



