SPRAY MACHINERY 



127 



Power Sprayers. — The power sprayers vary in size. They 

 range from a two-cylinder pump up to three-cylinder pumps 

 of considerable capacity. The size of the engine varies from 

 IJ horse power to 4 horse power. The power sprayers are 

 more complicated and require more skill to operate than do 

 any of the hand pumps. In order to successfully operate a 

 power sprayer one must know something about gasoline 

 engines and understand the principles of pumps. 



Fig. 60. — A small power sprayer, suitable for the home or the small com- 

 mercial orchard. 



The power sprayers are the most efficient sprayers on 

 the market because they will permit greater pressure and a 

 finer distribution of the spray material. The pressure usually 

 carried in a power outfit varies from 150 to 250 pounds, and 

 the tanks range in size from 125 to 200 gallons. 



The power sprayer is usually equipped with a tower which 

 permits a man to reach all parts of an ordinary sized tree. 

 These sprayers are used in the commercial orchard or on the 

 large farm orchard. It requires three men to successfully 

 operate any of the power sprayers. 



Spray Machine Parts. — In order to thoroughly understand 

 a spray machine, one must understand some of the parts 



