50 THE PHYSICAL PROPERTIES OF SOILS 



EIGHTH EXERCISE 



CONTINUOUS RISE OF CAPILLARY 



MOISTURE 



At the beginning of the term the instructor will 

 fill twelve long capillary tubes with the following 

 materials : 



Tube No. I — Clay. 



Tube No. 2 — Loam or silt. ' 



Tube No. 3 — Sandy loam. 



Tube No. 4 — Sand. 



Tube No. 5— Muck. 



Tube No. 6 — Sand, lOO to 120 mesh. 



Tube No. 7 — Sand, 60 to 80 mesh. 



Tube No. 8 — Sand, 20 to 40 mesh. 



Tube No. 9 — Mixture, one part clay, one 



part muck. 

 Tube No. 10 — Mixture, one part sand, one 



part muck. 

 Tube No. II — Mixture, one part clay, one 



part sand. 

 Tube No. 12 — Mixture, one part loam, one 



part sand. 



After filling, these tubes are placed in a rack with 

 their lower ends resting in a tray into which water is 

 admitted to the depth of one inch. The experiment is 

 now ready for observation, and each student in the 

 class is required to make measurements and to record 

 the height of the rise of moisture at stated intervals 

 during the term. Observations should be made every 

 hour during the first day and at daily intervals for the 



