THE VOLTAIC ARC. 19 



conical they are unequally brilliant ; the positive cone is red- 

 white to a considerable distance from the point, while the 



FIG. 2. 



negative cone is merely reddened at its extremity ; and here 

 and there on each of the carbons are seen incandescent 

 liquid globules, which move about and glide to the point of 



2 2 



