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. BARBEL 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 



