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 Pipr 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 Totallengthof No. feet No. feet No. feet No. feet No. feet 
No. line in feet 3a" pipe 1"pipe 114" pipe 114" pipe 2% pipe 
100 100 _ —_ _ — 
150 75 75 _ _ _ 
es 250 15 75 100 = = 
. 300 75 75 100 50 _ 
500 5 75 100 125 125 
"5 15 — = = = 
100 60 40 has ae _ 
Greenhouse 150 60 60 30 — — 
No, 3 250 40 60 5 75 _— 
300 40 60 75 75 50 
400 40 60 %5 75 150 
50 50 — — —_ gas 
Greenhouse 100 40 60 — = ae 
No. 4 150 40 50 60 — — 
250 35 40 75 100 —_ 
30 30 — — — —_ 
Greenhou 70 20 50 ae aig = 
Nos. 100 20 50 30 aS _ 
150 20 50 40 40 — 
250 20 30 60 60 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: 
