2Q2 



ENGINEERING ON THE FARM 



Tile, when laid in the trench, should have even joints, 

 with no sharp bends, and present the general appearance of 

 a continuous pipe. The tile-layer should carefully inspect 



the tile as he proceeds 

 with the work and reject 

 all which are cracked, 

 soft, or so ill-shaped that 

 good joints cannot be 

 made. Defects can usu- 

 ally be noticed when the 

 tile is picked up with the 

 hook. 



Junctions and curves. 

 The incoming flow of 

 water should strike the 

 stream in the main at an 

 angle of approximately 

 30 . All tile factories 

 now make junction tile, 

 with the branch set at the 

 proper angle, and these 

 junctions should be used 

 whenever they can be obtained. However, good junctions 

 can be made of straight tile cut and fitted together. 

 Unless the grade prevents, the top of a branch tile should be 

 as high as the top of the main tile, at a distance from the 

 main equal to the length of the curve which joins the branch 

 to the main. Bends in tile-laying should be made by smooth 

 regular curves, with outside joints covered with pieces of 

 tile 1 inch larger in diameter than the tile laid, or the end 

 can be cut off the tile for the inside of the curve if the end of 

 the tile is caught between the jaws of a monkey-wrench and 

 pressed down on the handle. 



Inspection. After being laid, tile should be inspected by 

 the landowner to see that the joints are tight and tile 

 laid straight in the trench. It is also desirable to have an 



Fig. 239. 



After University of Minnesota 



Tile laid in trench ready for 

 blinding 



