448 ELEMENTARY ACTIONS. 



On the other hand, if -the points A and B are on different sides of 

 the pole, the angles y b and j a are equal, one to zero and the other 

 to TT : in this case the couple of rotation will be equal to 2!, and the 

 axis will turn continuously in the same direction. 



We thus again find an explanation of the various special features 

 in Faraday's experiment (456). 



466. The components X, Y, and Z of the action of a current 

 on a pole, placed at the origin of the co-ordinates, are, from what has 

 been said, 



z = -ydx 



If we put 



-/ 



(6) B 



ydz zdy 

 A= - ^- = G cos A, 



with the condition 



we shall have 



X= -IA= -IGcosA, 

 Y= -IB= -IGcosA, 

 Z = -1C- -IGcosv, 



and therefore 

 (7) 



