324 



PRINCIPLES OF SPRAYING 



times they are merely sections of gas pipe made of galvanized or 

 black iron. The inside diameter may be about one-fourth inch. 



Nozzles. — Spray nozzles are of 

 many types. They can be used in 

 connection with any of the spray 

 machines except the atomizer. Most 

 sprays require that the liquid be 

 made as fine as possible. Heavy 

 streams of liquid are not usually de- 

 sired. The best forms of nozzles now 

 in use are those with large discs, sold 

 as "disc nozzles" (Figs. 226 and 227). 

 The nozzle should be connected 

 with the spray rod by means of a 

 45 degree elbow, so that by merely 

 turning the rod the operator can 

 easily give a different direction to 

 the spray. He can thus more easily 

 strike all sides of the leaves and 

 stems of plants. 

 Dusting instead of spraying is frequently practiced. It saves 

 handling so much liquid and makes the work more rapid. Hand 



JTia. 226. — The large disk nozzle 

 gives a finer mist than the older types. 

 The angle connection, shown at the 

 base, makes the spraying easier and 

 more thorough. (Indiana Station.) 



Fig. 227. — Several types of spray nozzles. All modern nozzles have a large disk in which 

 the liquid is given a rotary motion before exit from the orifice. (New Jersey Station.) 



dusters made of loose burlap are often used in potato fields and 

 gardens. A machine blower for dusting several rows at once is 

 shown in figure 229. 



