2C4 Ground Water, Wells, qnd Farm Drainage. 



> ft ' er minuto - 



TABLE III. Coefficients of viscosity for water for various tern- 

 pcrnturrs centigrade. 



Observed and Computed Flows Compared. When 

 sands have been sorted into grades of nearly uniform size 

 and the effective diameter determined by the method of 

 (143) and then the flow of water through them measured 

 in such an apparatus as is represented in Fig. 95 the ob- 

 served and computed flows are related as given in the next 

 table. 



Pio. 95. Showing apparatus for measuring the flow of water through 

 sands and the relations of flow to the diameters of the sand grains. 

 Lines show theoretical flow; dots, observed flow. 



