45 



Pumps. 



The pump is a very important part of a spray ino; outfit. It should 

 ho strongly and carefull}' constructed and especially made for spraying 

 purposes. For use with Bordeaux mixture all the working parts 

 coming in contact with the mixture should be made of brass. Iron 

 is acted upon by Bordeaux mixture and is finally destroyed. Leather 

 valves should be avoided for the same reason. A good-sized air 

 chamber is also an essential feature in connection with the pump, as 

 it helps to maintain a uniform pressure. 



Two of the styles of pumps in common use arc shown in the accom- 

 panying illustrations (figs. 31, 32). 



Nozzles. 



Being supplied with 

 satisfactory power and 

 pump, the next im- 

 portant feature of the 

 outfit is the spray noz- 

 zle. A nozzle of the 

 Verinorel or cyclone 

 type (see fig. 33), when 

 p roper I3" made, will 

 give a fine mist -like 

 spray and is to be pre- 

 ferred to other types. 

 It is to be regretted 

 that most of the noz- 

 zles in general use, 

 whether of this form 

 or some other, are not 

 made with sufficient 

 care. The nozzles 

 should be made of 

 brass and the inlet 

 c h a m b e r a n d the 

 opening through the cap should be very smoothly and accurately 

 drilled. The frequent use of a degorger will gradually wear the open- 

 ing in the disk and make it irregular. For this reason interchangeable 

 disks are desirable. These should be made of hardened brass, steel, 

 or some other material which is neither attacked by the chemicals 

 in the mixture nor easily injured by a degorger. Iron, zinc, and tin 

 are worthless and should be carefully avoided. A poor nozzle wastes 

 power and material and sprinkles the vines instead of spraying them, 

 while the result of the work is not satisfactory. A properly made 

 nozzle shoidd give a fine mist-like spray with a minimum amount of 

 pressure. 



284 



Fig. ;;i). -Adjustable^ r.ids aiKl nuzzles loi' viii"yard spraying. 



