Whitehead — Magnetic Effect of Electric Displacement. 121 



with a strip of hard rubber ; the splits in the two rings were 

 in the same diametral plane. The rings were set on small, hard 



U 



a 



jdi 



Ozz. 



? 



liOrL. 



D 



a 



d 



rubber chairs, and carefully levelled and spaced so as to be as 

 nearly as possible the same radial distance apart at all points ; 

 this distance was l-O'^'"' (f^). In the earlier experiments this 



