308 AGRICULTURAL ENGINEERING 



must work directly, and often efficient work will depend upon 

 their quality. Cheap hose is poor economy. The extensions 

 are best when made of bamboo with a brass tube on the 

 inside to carry the liquid. Good substantial ferrules should 

 be provided at the ends to relieve the thin brass tube of all 

 strains due to dragging a length of the hose about. A con- 

 venient and perfectly 

 tight shut-off adds 

 much to the pleasure 

 of operation. 



There are two gen- 

 eral types of nozzles in 



Fig. 194. The Bordeaux nozzle and a USCI the Bordeaux 

 cluster of four Vermorel nozzles. i i_ T_ 



nozzles, in whicn a 



spray is produced by directing the jet against the edge of 

 the orifice; and the Vermorel, which has an eddy chamber 

 directly below the orifice. In the latter, the liquid is given 

 a whirling motion, causing it to be driven from the orifice 

 in a cone-shaped spray. 



The Bordeaux nozzle produces a fan-shaped spray, which 

 has considerably more force than the spray from the Vermorel 

 nozzle. The latter is generally known as the fine-spray 

 nozzle; by making the eddy chamber and the orifice large, 

 the spray has much more force and capacity. 



QUESTIONS 



1. What is spraying machinery used for? 



2. State some of the important construction features of sprayers. 



3. What are field sprayers used for? 



4. What adjustment should be provided for a field sprayer? 



5. What power is most generally used for power sprayers? 



6. Describe the different types of spray pumps of power sprayers. 



7. In what different ways is the pump driven? 



8. What types of agitators are used for power sprayers? 



9. Describe two types of spray nozzles. 



