Smithsonian Report. 1940.— White 



Plate 5 



1. Traction duster. 



The use of dusters equipped with a special spoon-shaped nozzle arranged on the end of the outlet tube so 

 that the dust is directed upward to the under sides of the leaves has proved an effective means of treating 

 the bean crop with dust. Photograph by Howard. 



2. Traction Sprayer. 



The use of sprayers with nozzles arranged in such a manner so as to cover the entire idant with liquid in- 

 secticides has proved more elTecIive than dusters. Photograph by Howard. 



