THE IRRIGATION AGE. 151 



remove the plug (point) from lower end (all large screen points should 

 be ordered with open ends) and place it in the proper location, being 

 most careful to keep it in a perfectly perpendicular position, so that 

 when it is sent down to the finish it will be exactly plumb. When it 

 is thus placed in position, use a sand bucket to remove sand from in- 

 side. As the sand is being removed from the inside of screen point 

 the operator will cause the screen point to be turned round and round, 

 and when it reaches a point where its own weight does not suffice to 

 settle it as fast as the sand is taken out, then employ the same method 

 for driving it down that is used for driving small points, and drive 

 only as fast as the sand is'taken out from inside of screen. When the 

 top of screen is well down to the bottom of open well, another screen 

 point, when necessary, may be coupled on to the top of first one and 

 the process of putting down continued as before. When all of the 

 screen is down to bottom of open well then connect a length of heavy 

 pipe for suction pipe, and continue to lower the screen point until it is 

 down where it is intended to be lodged. As soon as the screen point 

 is down into position then proceed to close up the lower end. 



To close lower end of screen point take enough Portland cement 

 to form a plug as thick as equals one-half the diameter of screen point. 

 Example: For a screen point ten inches in diameter, use enough to 

 make five inches thick. To put cement in place divide the quantity 

 to be used in three equal parts, then put each equal part into a sep- 

 arate paper bag and tie a stout string or cord to top of one of the 

 paper bags filled with the cement and let it down gently to bottom of 

 screen point and with a jerk liberate the cement, and let down the re- 

 maining bags of cement in the same manner. The cement will set and 

 become hard in the course of forty -eight hours. 



Pumps for irrigation work to be operated by wind mills consist, 

 1st, of the cylinder or working barrel; 2nd, the pipe and strainer, or 

 screen point, which is called suction pipe with strainer or suction pipe 

 with screen point, and which conveys the watsrinto the cylinder, and 

 ground than where the mill stands. It will only be necessary in such 

 cases to use the discharge pipe for a stand pipe, which can be extended 

 up high enough in the tower to give the required head to force the 

 water through the connecting pipe to reservoir, and thus do away with 

 the very objectionable force pump head or standard, such as has been 

 in use heretofore. The stand pipe may be continued on up in the 

 tower to, or near, the platform at mill when necessary to obtain the 

 head of water required to force it to and into the reservoir. When 

 necessary to have a very high stand pipe, a tower of sufficient height 

 to admit the use of the high stand pipe should be used. 



The connecting pipe which is to carry the water from the stand 

 pipe to the reservoir is called the lead pipe and should be large enough 



