ELECTRIC DISCHARGE WITH THE CHLORIDE OE SILVER BATTERY. 495 
These results are shown in the diagram, fig. 18, in which the abscissae are the 
relative distances of the rings, as given in the last column of the above table, and the 
ordinates the potentials in numbers of cells. 
Fig. 18. 
The following experiments were made in order to ascertain the effect produced on 
the potential of different parts of a vacuum tube connected at the ends with the 
opposite poles of an insulated battery when the centre of the tube was put in com¬ 
munication with earth, fig. 19. 
3 s 2 
