[cl ark] 



VISCOSITY OF ETHYL ETHER 



53 



I. Results obtained by raising and lowering temperature. 



Only one tube was used in 1913 and the results were as shown in 

 Figures 4 and 5. Figure 4 shows the decrement for the liquid side and 

 Figure 5 for the vapour side. But since the method of cutting the 

 spiral line on the cylinder had not been perfected it was deemed wiser 

 not to publish the results until further experiments had been carried 

 out under conditions assuring a higher degree of accuracy. In nearly 

 all the curves, observations were begun at room temperature and carried 

 on up to the highest point at intervals of about 10°. Then the tem- 

 perature was lowered again to the critical temperature. But the values 



O^ 



04 



0^ 



02 



X ^x 



I80* 20O- Z20 



oLiquiD Up xLiQUiD Down, 



Fig. 4. 



