NOMOS. 



109 



have called subtensial, and that the continual repeti- 

 tion of this movement will carry E around s in a cir- 

 cular orbit, or rather in a polygonal orbit which 

 cannot be distinguished from a circle. The explana- 

 tion is precisely the same as that which was employed 

 when speaking of the rotation of the magnet around 



Fig. 26. 



Fig. 25. 



the conductor, and we have only to change the letters, 

 and place E for M and s for c, and the former diagrams 

 will serve to illustrate the present object. 



