82 



RP^NNlliS AGKICULTURK. 



A Satisfactory 

 Method. 



A second method is to fasten a spirit-level on a 

 straight-edge about eight feet long. First find the 

 grade that can be secured and mark the level 

 accordingly, which will decide the grade on bottom 

 of the drain. 



44. CONNECTING TILES IN DRAIN. 



Laying Tiles. When laying the tiles, turn them so that the 



joints fit close and make sure that they are firmly 

 laid. For connections, make an opening in the 

 main drain tile with a steel chisel, fitting the lateral 

 tight. Tiles made with connections are more con- 

 venient. See III. 44. 



