﻿deduced from the Electrical Theory of Matter. 73 



from the electron in the moving system at 0' is 



It will be observed that this expression is independent of 

 the origin of time which we choose ; in fact, if we consider 

 any instantaneous electronic motion in any orbit in the system 

 at rest which occurs at the time Tj and at the point A and 

 which produces its effect at the point P at the time t, the 

 interval between the occurrence of the corresponding motion 

 and the production of the effect at the point P' in the moving 

 system is 



era! 



ST 1 = e V2( f _ Tl ) + 



C 5 



where t and T 1 are measured from any origin, and a is the 

 difference of the x coordinates of P' and A' *. 



Pig. a. 



Now consider any two electrons e A and e. 2 f which produce 

 at the points A and B (tig. 2) in their respective orbits, ami 



* In all that follows, a dashed letter will refer to the moving- system. 



t The orbits shown in the figure are not intended necessarily to bo in 

 the same plane as the point P, nor indeed are they intended to be plane 

 orbits at all, they may be of any shape. 



