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able cost and large size ; the latter renders them unsuit- 

 able for the large majority of estates, where the ground is 

 rocky and uneven. 



Barrel Sprayers. These are cheap and very efficient. 

 There are many good styles of barrel spray pumps on 

 the market, a good idea of which may be obtained from 

 the accompanying figures. These outfits may be mounted 

 on wheels, and in fairly level situations they can be 

 handled easily. (Figs. 170 and 171.) 



Fig. 171. Gem spraying outfit. 



Certain of these pumps will easily supply two lines 

 of hose, with one man to work the pump, while others 

 are capable of supplying only one line. 



The spraying gang will thus consist of either two or 

 three men who move the outfit from place to place, 



Knapsack Sprayers. The knapsack sprayers are more 

 portable than the barrel sprayers, being adapted for use by 

 one person to each outfit. The Success knapsack sprayer 

 and other machines of the same kind consist of a tank 

 with a capacity of about 5 gallons, with a small force 

 pump attached. The outfit is carried slung on the back 

 of the labourer, the spray fluid being discharged by the 

 action of the pump. The operator works the pump and 

 directs the spray. 



