162 VEGETABLE FORCING 



the pressure of the water and the nozzle to be used. It 

 is better not to have too great a length of pipe of any 

 one size. 



The following table, prepared by the manufacturers 

 of an approved system, will be found valuable in estimat- 

 ing the pipe requirements : 



SIZES OF PIPE FOR GREENHOUSE NOZZLE LINES 



Calculated on greenhouse nozzles placed 3 feet apart in the line. If 

 the nozzles are closer together larger pipe must be used 



Nozzle Total length of No. feet No. feet No. feet No. feet No. feet 

 No. line in feet fi" pipe 1" pipe lJ4"pipe l^'pipe 2* pipe 



125 



Greenhouse 

 No. 3 



50 50 _ 



Greenhouse 100 40 60 



No. 4 150 40 50 60 



250 35 40 75 100 



Greenhouse 

 No. 5 



80 



The nozzles on the greenhouse lines are generally 

 placed 3 feet apart. The theoretical discharge from 100 

 No. 2 or No. 3 greenhouse nozzles, according to estimates 

 of the manufacturers, is shown in the following table : 



