94 SPRAY APPARATUS 
Barrel Pumps 
Barrel pumps of one type or another are in use in the majority of 
orchards of moderate size where any spraying is done. Usually they 
are mounted directly on a 50-gallon barrel, which serves as the spray 
tank. Such pumps have a capacity ranging from 1 to 4 gallons of 
i 
Fic. 60.—A barrel pump. Original. 
liquid per minute, and are intended to operate at a pressure of 100 to 125 
pounds. They are capable of furnishing material for two leads of hose. 
Commonly the outfit is placed on a wagon of some kind, or on a sled. 
Unless the trees to be sprayed are headed very low, there should be a 
simple tower or elevated platform, about 4 feet high, bolted to the 
wagon, on which one of the operators may stand while the other 
works from the ground. 
