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Mr. R. E. Barnett. On the Viscosity of [June 21 f 



In calculating 1 the value of the viscosity of water from. Mr. 

 Hannay's figures, the well-known formula 



V/ 



was employed, in which 



rj = Viscosity in dynes per sq. cm. in C.Gr.S measure, 



r = Radius of the capillary in cm. 



I = Its length in cm. 



V = Volume of liquid transpired in c.c. 



p = Its density at the temperature of observation. 



p = Pressure in dynes per sq. cm. (g = 981). 



t = Time of flow in seconds. 



On applying this formula to the experimental results given for 

 water, the figures embodied in the subjoined table (I) were obtained. 

 In Columns 1 and 2 are the temperatures of observation and the 

 corresponding times of flow as recorded by Mr. Hannay. Columns 3 



Table I. 



