226 APPENDIX 



gether. This will make a cylinder 6 feet long. It may 

 be desirable in some cases to use fourteen or even eighteen 

 sections. 



2. Place a piece of filter paper over the lower end of 

 the cylinder, and over this place a piece of cheese-cloth, 

 bringing the edges of both filter paper and cheese-cloth 

 up over the cylinder, and strongly tie in place. 



FIG. 91. Threaded section of brass tubing used in studying distribu- 

 tion of water in soil columns. 



3. With colored pencil, number the sections of the 

 cylinder 1, 2, 3, and so on from top to bottom. 



4. Fasten the cylinder in an upright position with the 

 bottom resting upon a pan, or other support. 



5. Fill the cylinder with graded fine sand and settle by 

 tapping until settling ceases. For uniformity of filling, 

 an excellent method is td introduce the end of a large 

 funnel into the top of the cylinder and introduce the sand 

 into the cylinder through the funnel, pouring the sand 

 into the funnel at such a rate that the funnel will not 

 become empty at any time during the filling. If the 

 funnel can be held, during this process, so that the lower 

 end of the stem shall be just below the top of the cylinder, 

 the filling of the upper section will be more nearly uniform 

 with that of the lower sections. To produce the settling, 



