1G4 



MOSQUITO ERADICATION 



Several other types of sprayers are also in use. There are 

 various styles of pumps adapted to use on barrels, etc; the .barrel 



Fig. 110. — The knapsack sprayer. 



Eig- 1520 



Fig. 111. — Barrel sprayer mounted on a cart. 



may be mounted on a barrel cart or, where conditions will permit, 

 on a truck or wagon or on a boat. Considerable pressure may 



