NOMOS. 77 



in a circle must commence. A longer or shorter in- 

 terval of time may elapse before this adjustment is 

 effected, according as the impulse is powerful or feeble, 

 but it must be effected in the end, and when it is, 

 then the magnet must describe a circle around the 

 conductor, the movement being to the right or left 

 as the direction of its currents may determine. 



In explaining the motion of a magnet around a con- 

 ductor it is possible then to dispense with the idea of a 

 repellent force, and explain all by the force of simple 

 attraction. It is possible, indeed, to understand that a 

 magnet might really circulate around a conductor, and 

 not merely be driven along a circular path to which it 

 was confined by the form of the apparatus ; and thus, 

 while it is possible to explain what was not before 

 explained, the law itself is greatly simplified. 



Nor is it different when the magnet is fixed and 

 the conductor moveable ; for the reactions of which 

 we have spoken must operate upon the conductor 

 as well as upon the magnet, and not only must the 

 conductor move if it be moveable and the magnet 

 fixed, but conductor and magnet must move around 

 each other if both were free to move. 



It is practically as well as theoretically certain that 

 electrical currents will produce these move- 

 ments of rotation when passing at right 

 angles to each other, and this, therefore, 



is an argument that electrical currents do electrical 



conductor. 



surround the magnet in the direction 



which has been supposed, and that the explanation 



