334 The Principles of Fruit-growing 



Synopsis of the principal considerations in the choice of 

 a power sprayer and nozzles (Melander and Beattie, Wash. 

 Bull. No. 106): 



1. General operation and efficiency. 

 Capacity. 

 Engine 



Type of motor. 



Operating with distillate or denatured alcohol. 



Average horse-power. 



Maximum brake horse-power. 



Cubic feet of piston displacement per horse-power hour. 



Revolutions per minute. 



Capacity of fuel- tank. 



Cooling device: 



Efficiency. 



Amount of heating. 

 Ignition. 

 Detachability from pump for other uses. 



Pump 



Belt- or gear-drive. 



Number and style of cylinders. 



Diameter of pump cylinder. 

 , Length of stroke. 



Strokes per minute. 



Discharge per minute at 250 pounds pressure. 



Maximum operating pressure. 



Capacity of air-dome. 

 Outfit- 

 Tank capacity. 



Filling pump: piston or rotary. 



Weight. 



Economy of operation. 

 Engine 



Time lost due to engine. 



Horserpower hours per gallon of gasolene used. 



Gallons of gasolene per 100 gallons pumped. 



Gallons of lubricating oil per 100 gallons pumped. 



Percentage of fuel-tank capacity used an hour for operation. 



