33 



KNAPSACK SPRAYER.— The knapsack sprayer (Fig. 

 15) obtains its ñame from tlie fact that it is strapped to tlie back 



Figure 15 



of a man who carries it along, at the same time pumping and 

 directing the nozzle. The principal is most excellent, bnt in 

 practice it is not well to attempt very extensive operations with 

 it. The load is heavy and the eonstant movement eaused by 

 pumping makes the baeks of the workmen chapped and sore; 

 further, the pump must be in perfect trim if the pressure is sat- 

 isfactory. The knapsack sprayer is most useful for treating 

 low growing plants which do not warrant the outlay for a 

 larger sprayer. $15,00 should buy a good sprayer of tliis class. 



