30 



NOTES ON THE TWO ELECTRICITIES. 



conductor A, similarly situated, was presented to the 

 ball on the negative side of the machine. The 

 whole apparatus was supported upon glass pillars 

 and had no electrical communication with the ground 

 by means of a chain or otherwise. Upon turning 

 the glass cylinder of the machine, a constant succes- 

 sion of sparks took place between the ball of the 

 prime conductor of the machine and the ball of the 

 insulated conductor B, as also a constant succession 

 of sparks took place between the ball at the negative 

 side of the machine and the ball of the insulated 

 conductor A, and by continuing to work the machine 

 a rapid succession of sparks for any length of time 

 was maintained. 



FIG. 5. 



