Spraying Devices and Machinery. 223 



All operators do not desire the same kind of spray even for 

 the same kind of work. It is commonly said that the best 

 spray is one which most nearly resembles a fog. This is true so 

 far as the spray is concerned, but the trouble cornes in applying 

 it. A fine spray cannot be applied so advantageously as a 

 coarser one, nor can it be applied so rapidly for the reason that 

 the finer the spray the less liquid is thrown, and the smaller the 

 area treated. Whenever the wind blows, a fog-like spray will go 

 wherever the wind carries it, and not where the operator directs 



FIG. 36. Potato sprayer ; the liquid flows by the force of gravity, and is spread by 

 means of revolving brushes, BB ; A, rod attached to agitator ; T, tank. 



it. Sometimes this will be an advantage. It is especially so 

 when the wind is blowing in the right direction. Yet when the 

 other side of the tree is being treated the wind will come from 

 the wrong direction, and much of the material is blown where 

 it is not wanted. In addition to this, the work is more slowly 

 performed, and whether it is more thoroughly done than when 

 a coarser spray is used is still open to doubt. After having tried 

 both kinds of sprays, it appears to the writer that if the parts to 

 be treated are close by, a fine spray is to be preferred, as then 

 there is less waste and an even application may be made. If 



