62 IRRIGATION. 



inch deep, and one inch wide. A funnel of the same 

 metal, (tin or galvanized iron would soon rust out), should 

 be made to fit in this groove, its upper edge being turned 

 over about an inch for the purpose. The funnel at its 

 lower end should be furnished with a pipe turning up in 

 such a way as to constitute a trap. Near the top of the 



Fig. 26. BARREL TANK. 



funnel there should be a shoulder capable of supporting 

 an ordinary round stove-grate of cast-iron ; this grate is 

 intended to keep back any coarse matters which might 

 obstruct the siphon, and to serve as a weight to keep the 

 funnel in its place. Into the two-inch hole in the barrel 

 top insert a ventilating pipe, which may be of tin, and 



