Il8 IRRIGATION FARMING. 



The walls of the pipe are formed of longitudinal 

 staves braced together with iron or steel bands. These 

 are shaped to cylindrical forms and on the edges to 

 true radial lines, so that when put together they form 

 a perfectly cylindrical pipe. The flat edges of the 



FIG. 27 — CROSS-SECTION OF STAVE PIPE. 



staves are essential to enable the empty pipe to resist 

 the pressure from the overlying earth. To join the 

 ends of the staves a thin metallic tongue is inserted, 

 which being a trifle longer than the width of the stave, 

 cuts into the adjoining ones. This joint is very tight 

 and easy to make. The confining bands are of round 

 or flat iron, or steel, of from three-eighths to three- 

 fourths inches in diameter. As shipped from the ^fac- 



