7* 



Conductivity of Aqueous Solutions. Part IV. 

 Table 14. Actual conductance of water in the bomb. 



36. VARIATION OF THE CONDUCTANCE-CAPACITY WITH THE 



TEMPERATURE. 



The following measurements and computations were made in order to 

 determine what variation in the conductance-capacity of the bomb is 

 caused by the change in the diameter and length of the electrode cup or of 

 the small electrode and in the diameter of the bomb itself owing to the 

 expansion upon heating. 



The apparatus used to determine the variation of the conductance when 

 the electrode was placed within the quartz cup was an imitation of the 

 bomb, consisting of an outer cylindrical brass vessel, a cup composed of 

 a glass tube with a brass electrode permanently fixed at the bottom of the 

 tube with rosin, and a piece of insulating material (the "red fiber" of 

 trade) separating the cup from the bottom of the vessel, and allowing the 

 electrode rod to pass through it. Combinations of three such electrode 

 cups of diameters 1.31, 1.50, and 1.59 cm. and of two brass vessels of 

 diameters 4.22 and 4.54 cm. were investigated. Mercury was used to 

 change the effective height of the cup, the change being determined by 



