SELECTING MACHINERY AND EQUIPMENT 



313 



tion, which cannot be remedied during the height of the spray- 

 ing operation, but which nevertheless affect the productive 

 capacity of the outfit. A 10-gallon per minute outfit is likely 

 to become a 6- or 8-gallon outfit before the spraying is done 

 and repairs may be made. 



{Bardie Mfg^ Oo.} 

 Fig. 105. A three-cylinder pump. 



Power spray pumps have two, three, or four cylinders 

 (Figs. 104 and 105) . Values and efficiency cannot be measured 

 solely in terms of the number of cylinders. A pump with three 

 small cylinders and inadequate engine power may be inferior 

 to a good two-cylinder outfit. 



The smallest power outfits have pumps of two cylinders with 

 a 2-inch bore and a 3-inch stroke. They are driven by 1- to 



