"?§ 



Mean time of flow at 0° 1498.5 sec. 

 Corrected for capillarity 1494.0 sec. 



Specific gravity of water at 0° 0.9999; at 26.48° 0.9967; at 

 26.03° 0.9968. 



Vo ' »i-2G.48 = 1493,9 X 0.9999 : 724,4 X 0.9967 = 2.0G9 

 li^ : ii.2G.03= 1494.0 X 0.9999 : 729.", X 0.9968 =^ 2.055 

 Thorpe and Rodgek M give for tiie viscosity of water at 



0° 0.01778 



25° 0.00891 



30° 0.007975 



Bingham ^) assumes the reciprocal of rj as a linear function of the 

 temperature. From Thorpe and Rodger's figures follows: 



1 



at 0° 



56.2 



25° 

 30" 



112.0 

 125.4 



From this follows: 



For 

 this : 



and 



at 26.48° -— 115.97 

 the ratio of the viscosities at 26.48 



at 26.03 114.76 



and 0° we find from 



Vo 



115.96 



■ÏJ26.48 



^c 



56.2 



= 2.068 



114.76 



— = 2.042. 



'»J26.03 56.2 



Our result at 26.48, 2.069, agrees with this to less than Vj %, 

 which may be regarded as sufticient. The agreement of the other 

 figures is a little less satisfactory (about 0.7 Vo)» which is probably 

 the consequence of the less perfect equilibrium of temperature. 



1) Thorpe and Rodger, On the relations between the viscosity of liquids and 

 their chemical nature. Phil. Trans. 185 A, p. 449, 1894. 



~) Eugene C. Bingham and Miss J. Peachy Harrison, Viskositiit und KluiditiU. 

 Z. f. Physik. Gh. 66, p. 1, 1909. 



Eugene G. Bingham Viscosity and Fluidity, A Summary of Results. Phys. Rev. 

 XXXV, p. 407, 1912; Phys. Rev. (2j I, p. 90, 1913. 



