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. 



Maximimi operating pressure. 



Capacity of air-dome. 

 Outfits 



Tank capacity. 



Filling pump: piston or rotary. 



Weight. 

 Economy of operation. 

 Engine — 



Time lost due to engine. 



Horse-power 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. 



