on various Phcenomena of Induction. 



271 



d. The circuit of the induced wire being closed by a pile 

 of a single pair, and that of the second inductor being open. 



e. Lastly, the same conditions existing as in the case d, but 

 the circuit of the second inductor being closed by some mer- 

 cury. 



18. These experiments have led to the following results: — 



a. The state of the simultaneous or separate closing or 

 opening of the circuits of the induced wire and of the second 

 inductor wire has no influence on the intensity of the inducing 

 current (^). 



b. This intensity diminishes in arithmetical progression, for 

 the lengths of the inductor wire increase in geometrical pro- 

 gression (yj). 



c. The intensity of the inducing current is independent of 

 the presence or the absence of a voltaic current in the induced 

 wire ; it does not vary with the state of closure or of open- 

 ing of the circuit of the second inductor (5). 



19. The annexed Tables contain the confirmation of these 

 laws. 



