1883.] Electric Discharge ivith Chloride of Silver Battery. 293 



and shape of the vessel have any effect on the pressure of minimum 

 resistance to the electric discharge. This was found to be the case, 

 for example, with a residual air charge in a spheroidal vessel 7 inches 

 (17'8 centims.) long, and 5 inches (12"7 centims.) diameter (fig. l),the 

 pressure of minimum resistance was as high as 3 millims., 3947 M ; 

 while in a tube 22*5 inches (57 centims.) long, and 1*625 inches (4*1 

 centims.) diameter (fig. 2), it was only 0*69 millim., 908 M ; again in a 



