290 Mr. W. J. Walker : Relationship between Viscosity, 



From these figures it appears that the specific gravity 

 increases uniformly with the percentage of salt in the solution 

 until this attains a value of about 20 per cent. After this 

 point the rate of increase in specific gravity, diminishes. This 

 is probably due to the fact in the stronger brines, solution 

 was not complete but that some of the material was held 

 in suspension. 



As a check on the accuracy of the viscosity apparatus, this 

 was used to determine the viscosity of water at 62 c, 3 'F. 

 The mean value obtained was "00002265 in F.P.S. units as 

 against Poiseuille's value of '0000227. This result gives an 

 assurance that experiments have been carried out with a fair 

 degree of accuracy. The results of one series of experiments 

 on each solution are given below, the sodium chloride series 

 being carried out at a temperature of 62°*5 F. and the 

 calcium chloride series at a temperature of 63° F. An 

 empirical formula w T as deduced for the sodium chloride 

 series before the calcium chloride series was carried out and 

 is given here: 



^=•00002265+ •0000428( / d-1) + -000228( / o-1) 2 . 



This gives in F.P.S. units results practically identical with 

 experimental values. 



Sodium Chloride 62° -5 F. 



Calcium Chloride 62 



°F. 



P- 



fi. 



M 



P- 



fl. 



E 







P 







P 



1-000 



•00002265 



1-000 



1-000 



•00002248 



•993 



1-008 



•00002300 



1009 



1-0188 



•00002358 



1-022 



1015 



•001)02335 



1-016 



1-054 



•00002586 



1-083 



1-025 



•00002380 



1-025 



1-063 



•00002660 



1-106 



1-037 



•00002445 



1-041 



1-084 



•00002855 



1-163 



1-058 



•00002548 



1-063 



1-1029 



•00003020 



1-210 



1-065 



•00002580 



1-071 



1-115 



•00003170 



1-256 



1078 



•00002685 



1-100 



1-130 



•00003318 



1-295 



1-095 



•00002790 



1-126 



1-149 



•00003555 



1-365 



1-115 



•00003035 



1-165 



1-165 



•00003800 



1-425 



1-142 



•00003250 



1-255 



1-184 



•00004180 



1-523 



1-170 



•00003655 



1-378 



1 



1-2078 



•00005060 



1-850 



Note. 



" is here taken relative to water at 62° *5 F. 

 P 



The curves for these solutions showing the relation between 

 viscosity and density are given in fig. 2 (PL IV.). 



It was intended at first to deduce an empirical formula for 



