44 MISC. PUB. 526, U. S. DEPT. OF AGRICULTURE 
FicurE 38.—Knapsack sprayer. 
The bucket pump.—This apparatus is also called a stirrup pump. 
It is merely a single- or double-acting pump equipped with hose and 
nozzle (fig. 4) which may be clamped or set in a bucket or tub con- 
Ficure 4.—Bucket pump with hose, extension rod, cut-off, and nozzle. 
taining the liquid insecticide. This type of sprayer is intended for 
the home gardener. Its chief shortcoming is the fact that the oper- 
ator must remain stationary while pumping. 
