22 FARM AND SCHOOL PROBLEMS. 



Facts About Tile. 



Tile are made of clay or cement. 



Clay tile are made of clay suitable for making good brick. 



Tile range in size from 2 to 36 inches jn diameter. 



They range in length from 12 to 30 inches. 



A round tile is stronger and will hold up more weight than 

 hexagonal or octagonal tile. 



Round tile are more easily handled, hauled and shipped. 



Soft-burned tile if not below the frost line in the ground 

 will crumble. 



Hard-burned or vitrified tile are not injured by freezing 

 unless water stands in the tile. 



Thick tile make the best joints because they are not so apt 

 to slip out of place as thin tile. 



The United States Government reports- recommend that tile 

 should weigh at least as follows per foot : 



Four inch tile Six pounds. 



Five inch tile Eight pounds. 



Six inch tile Eleven pounds. 



Experience has proven that no tile smaller than 3 inches 

 should be laid, and 3 inch should never be used except where 

 there is ample fall and where the lateral drains are laid close to- 

 gether. The smaller the tile the more easily and the more apt 

 they are to become displaced, and the flow of water to be re- 

 tarded by the disconnection. 



(For facts relating to cement tile, read Farmers' Bulletin, No. 524, 

 U. S. Dept. of Agriculture.) 



It is better to use too large tile than too small. 



Rules for Laying Tile. 



In all instances the size of tile to be used will depend upon 

 some of the following conditions : 



1 . The fall or grade from the beginning of the ditch to the outlet. 



2. The type and nature of the soil as to percolation of water. 



3. The average amount of rainfall annually. 



