SPRAYING 



253 



Fig. 119. Type of nozzle 



Most of the Vermorel and self-cleaner nozzles are of small 

 capacity, largely because the small orifices through which the liquid 



must pass, and the abrupt 

 changes of direction which it 

 must make, reduce its speed 

 and nullify the effects which 

 would otherwise be obtained. 

 The Bordeaux type of noz- 

 zles — strongly advocated by 

 many Western orchardists — 

 usually make a flat, fan-shaped 

 spray that is coarse and much 

 heavier in the center of the fan 

 than at the edges. These are 

 also of large capacity, and can 

 be adjusted to throw a solid 

 stream of liquid. 



Cap nozzles of small capac- 

 ity, which are often miniature types of disk nozzles, are suitable for 

 bucket pumps and small hand sprayers. Those of large capacity 

 are preferable to the Ver- 

 morels. Solid-stream nozzles 

 are best suited for spraying 

 tall trees, and because of their 

 extremely large capacity can- 

 not be used with any of the 

 smaller power machines. This 

 observation applies especially 

 to the Worthley nozzle, which 

 has been developed for use in 

 spraying the gypsy and brown- 

 tail moths in Massachusetts. 



Spray rods. Extension rods 

 are necessary for spraying 

 large trees, since most of the 

 modern nozzles produce a 



fine-mist spray, which has very little carrying power. For small 

 orchards a section of |-inch iron pipe serves the purpose very 



Type of nozzle 



