PIPES FOR IRRIGATION PURPOSES. 



119 



tory they are straight and provided on one end with a 

 square head and on the other with a thread and nut. 

 They are bent on the ground on a bending table and 

 coated with mineral paint, or asphalt varnish, and are 



FIG. 28 — STAVE PIPE-LINE IN POSITION. 



cut about six inches longer than the outside circum- 

 ference of the pipe, on which they are slipped loose. 

 The ends are joined by means of a closed iron screw, 

 which fits close upon the pipe and provides a shoulder 

 for the head and nut. These bands are placed at 

 varying distances apart, according to pressure which 

 the pipe is required to bear. The staves break joints 



