PIPES FOR IRRIGATION PURPOSES. 89 



longer than the width of the stave, cuts into the adjoin- 

 ing 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 factory they are straight and pro- 

 vided on one end with a square head and on the other 

 with a thread and nut. They are bent on the ground 

 0:1 a bending table and coated with mineral paint, or 



FIG. 26. CROSS SECTION OF STAVE PIPE. 



asphalt varnish, and are cut about six inches longer than 

 the outside circumference 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 so 

 as to form a continuous pipe, which leaves no obstruc- 

 tion to the flow of water. The beauty of this system is 



