76 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



The zero-bath was prepared as follows: A large glass battery-jar was filled 

 with finely crushed ice and distilled water. It was then placed in a water- 

 bath and the space between filled with finely crushed ice and water. This 

 proved very efficient, as it was possible to keep within 0.05 of zero for hours. 

 The bath at 25 was of the ordinary form, and was kept in constant motion 

 by a stirrer driven by means of a hot-air engine. The thermometers used 

 could be accurately read to 0.02. The burettes and flasks were carefully 

 calibrated. 



CONDUCTIVITY MEASUREMENTS. 



All the conductivity measurements were made at the two temperatures, 

 and 25. In tables 48 to 50, v = number of liters of solution containing a 

 gram-molecular weight of the salt; /x y O = molecular conductivity at 0; 

 /u.,,25 = molecular conductivity at 25. 



TABLE 48. Molecular conductivity of silver nitrate. 



