
oo ee 
20 BULLETIN 495, U. S. DEPARTMENT OF AGRICULTURE. 
carry the full head of water. As the water is diminished by each 
nozzle the pipe can be reduced in size, finishing with a 3-inch pipe 
at the extreme end. The customary sizes of pipe used for the nozzles 
now on the market are set forth in Table 1. 
TABLE 1.—WNSizces of pipe used for nozzles now on the market. 

me }-inch | 1-inch | 11-inch | 13-inch} 2inch 
ofline. | Pipe- | Pipe. | pipe. | pipe. | pipe. 
(agian 1 150) ee ee etre ae 
200 130 (Lie ae See [oteeetes creeteee 
: 220 100 15001. 24. cee ee eee 
Nozzle No. 1, outdoor, 4 feet apart..-..-.----.....-.. = 1“ = Bs etaiey wate [55 2s = 
500 90 160 150 106 | 22 
600 90 160 175 ry is Ceres 
700 90 160 175 175 | 100 
150 115 Le ees pa Cag ot ees ee 
200 100 100 Uke See 
250 90 100 60 | 2224 pa ae 
ee) No. 2, outdoor, 4 feet apart, or No. 1, 3 feet 300 90 100 110s See 
apart 400 80 100 120 100 }223322 
500 75 100; + 120 120 | 85 
600 75 100 | 120 120 185 

Nozzle lines are spaced such distances apart as will best fit the 
field within a range of 50 to 56 feet. The type of nozzle line de- 
pends principally upon the method used for supporting the pipe. 
The three popular methods are: On tall posts. on short posts, or on 
cables suspended from high posts. 
Tatit-Post TYPE. 
When tall posts are used they are set in the ground 24 to 3 feet 
and cut off about 64 feet above the ground (fig. 13). These posts 
are spaced 15 to 20 feet apart and the nozzle line placed on the tops 
in roller bearings in the case of long lines and between nails in short 
lines. If the post is of wood it should be not lighter than 4 by 5 
inches, but a round post 5 to 6 inches in diameter will serve as well. 
A more durable but expensive post can be made from a 1 or 14-inch 
steel pipe set in a base of concrete 6 inches in diameter and 2 feet 
deep (fig. 12). Special concrete posts also make excellent supports. 
Where wooden posts are used it is advisable to treat the part going 
into the ground with a good grade of paint. tar, or creosote, to help 
preserve the wood. The treatment should extend 6 inches above the 
ground surface. 
The tall posts permit the passing of horses or men under hey pipe 
and obviate obstruction to cultivation. This is the most popular 
method and makes a good appearance when the posts are carefully 
lined and cut off at the tops so that the pipe will he straight. or unt- 
formly curved with the surface of the ground. 

’ . ’ n . ee ee _— a 
= Le ee be ana A el ee Se fe A _— 

