292 Mr. W. J. Walker 



Tentatively, it was found that F'(p 



Relationship between Viscosity, 



1) was of the form 

 (p — IV 1 where " n " lay between 1 and 2 for both solutions. 



On plotting log(/o — 1) against log ( 1 — — j practically 



straight lines are obtained in each case, as shown in fig. 3. 



The values for " n " for these two lines as drawn are 1*038 

 and 1*055 for sodium and calcium chloride respectively. 



In the Smithsonian Tables (1908) figures are given showing 

 the relation between viscosity and density at temperatures 

 10°, 30°, and 50° C. for sodium and calcium chloride solutions. 

 It was thought desirable to find how et n 3 ' and "A" varied 

 with temperature, so experiments were carried out at tem- 

 peratures ranging from 0° to 100° C. on the sodium chloride 

 solutions. The intermediate figures agreed well with the 

 Smithsonian figures, except that at 30° C. the Smithsonian 

 figures were slightly higher. In the case of the calcium 

 solutions the experiments were only carried out at the lowest 

 temperature. The apparatus was the same as used by 

 Reynolds * in his viscosity experiments and is shown in 

 fig. 4. Its reliability was proved by the good results it gave 



Fig. 4. 



for water. The low temperatures in the experiments were 

 obtained by means of a freezing-mixture of ice and sodium 

 chloride. At the same time figures were obtained to show 

 the variation of density with temperature of several solutions 

 of different strengths. These figures are not given, but they 

 were used to obtain for sodium chloride the curves shown in 



* Scientific Papers, vol. 



239. 



