NOYES AND COOLIDGE. 



ELECTRICAL CONDUCTIVITY. 



169 



holes at the top. The function of this tube is to prevent the bottom of 

 the bomb from getting hotter than the top ; for, if it does this bv ever so 

 little, a constant evaporation and condensation goes on in the bomb, which 



i:SiZE 



Figure 2. 



interferes with the readings of the auxiliary electrode and the specific-vol- 

 ume determinations. The inverted mica cone, N, is put in for the same 

 purpose : it prevents the cold condensed vapor from dripping onto the top 

 of the bomb. These arrangements also protect the bomb more effectually 



