Capillary Movements of Soil Moisture. 167 



195. Capillary Rise of Water in Sand. In the case of a 

 sorted sand with grains .4743 m. m. in diameter, when 

 saturated with water in an apparatus represented in Fig, 

 56, it was found that water was raised through a col- 

 umn 6.75 inches above the level of water in the reservoir 

 at the rate of 44.09 inches of water on the level per 24 

 hours, but that when the column was made 11.75 inches 

 long no water was raised to the surface. 



Fio. 56. Apparatus for measuring the maximum rate and height of 

 capillary rise of water in sands. A, evaporating reservoir; B, water 

 reservoir; C, rubber tube. 



From the formula in (193) a glass sand with grains the 

 size of this one should be able to lift water by capillarity 

 to a height of 10.11 inches and, since the quartz sand used 

 did lift water at the rate of 44.09 inches in depth in 24 

 hours through a height of 6.75 inches, and failed to lift 

 any water to a height of 11.75 inches, it is clear that its 

 maximum limit must lie very close to that computed for 

 the glass sand. 



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