366 TILE DRAINING. 



avoid breaking the pipe, and at the same time to make the 

 joint so accurately as to neither retard the flow nor to admit 

 earth from the filling. 



Boynton's pipes, which are shown in the accompanying 

 cuts, have a branch piece nicely fitted to the side of the 

 pipe that is to form a part of the main, the branch forming 

 a part of the lateral. On the end of this branch a collar 

 may be placed to receive the end of the lateral, making as 

 good a joint at the junction as at any other part of the 

 drain. 



Before this improvement was made, it was often neces- 

 sary, where a tile came into the main, to make a silt-basin 

 to catch any silt that might be deposited by the more slug- 

 gish flow of the water at that point. By its aid these silt- 

 basins may be, in nearly all cases, dispensed with, as the 

 lateral enters in an oblique direction, and the velocity of its 

 flow will be imparted to that of the main. 



FIG. 1. FIG. 2. 



FIG. 3. 



Fig. 1 shows the round tile ; Fig. 2, the collar ; Fig. 3, the 

 manner of laying these ; Fig. 4, the connecting joint of the 



