458 



Diseases of Economic Plants 



running almost continuously, thus sometimes doubling its 



output. 



The use of extension rods and the tower in spraying is 



shown in Fig. 230. 



Nozzles.'"'*^— The va- 

 rious types of nozzles 

 are illustrated in Fig. 

 234. These include 

 the Bordeaux type 

 (upper left corner) , the 

 Vermorel (lower left 



Fig. 232. — Spraying apparatus. 



corner) , and the eddy-chamber type. 

 The last is the best type of nozzle 

 for spraying, and many forms of 

 it are on the market. The eddy- 

 chamber angle nozzle (lower right- 

 hand corner) is a comparatively re- 

 cent development. 



Fig. 234. — Various types of nozzles. 



Fig. 233. — Diagram of 

 longitudinal section of 

 a spray nozzle showing 

 all the parts that may 

 be found in the eddy- 

 chamber nozzles. O, ori- 

 fice; EC, eddy-chamber; 

 P, post on the direct- 

 ing disc, DD; C, Cap; 

 W, washer; OB, oblique 

 supply holes; S, strainer; 

 R, reservoir; B, base of 

 nozzle; D, disc, C, cen- 

 tral supply hole. After 

 Crane. 



Dusting machines. — These consist of various forms of 

 blowers driven by hand or by gasoline engines. Fig. 235 

 shows one of these machines in use for sulfuring. 



