HO !•: SOUTH INDIAN" INSECTS. ETC. [CHAP. XI. 



generally hold lour gallons of liquid but, .is these when full weigh 

 upwards ol t i M \ pounds, the} are too large and heavy tor the 

 physique of the ordinary cooly, in Southern India at all events, 

 where the weight of a fully-charged sprayer should not exceed 



forty pounds. 





Fig. 46. -Gould's Knapsack Sprayer. nected I ndle-lever 



and strainer fitting belou cap of fillei hole. (Author's original ] 



In K' sprayers the pump may be outside the reservoir or 



may be enclosed within it: the latter type is preferable, as the 

 pump is less liable to injurj and is better protected from dust and 

 ^rit. The straps should be wide so as not to cul into the carrier, 

 and this is particularly necessary in India where these straps come 

 into direct contact with the bare skin of a cooly. In the best types 

 two handles are provided, our for use when the sprayer is carried 

 on the back and the other, working up and down like a bucket 

 sprayer, for use when the sprayer is used on the ground. For the 

 latter purpose a footrest is necessary and is usually provided A 

 good mechanical agitator is essential and is usualh provided in 

 the form of a metal fi eet which moves with each motion 



of the pump, to winch it is attached. A strainer is an essential 

 fitting and is usually provided in the form of a detachable metal 

 sieve. 



