GAS SPRAYERS 319 



be preferred. Some form of agitator is usually connected with the 

 lever so that the liquid is kept stirred constantly. These may be 

 provided with either one or two lines of hose and connection rods. 

 If barrel sprayers are used on wagons or sleds drawn by a horse 

 the man operating the pump may also do the driving. An assistant 

 is required for handling each line of hose and rod. 



Tank Sprayers of many sizes are used in large orchards (Fig. 

 224). The pumping may be either by hand or by engines of 



Fig. 221. — Compressed sir Bprayer, handy for garden use. (U.S.D.A.) 



various kinds (Fig. 225) . A suction hose leads from the tank to the 

 pump and special agitators are usually required. 



Gas sprayers are frequently used by orchardists. Gas tanks 

 containing either condensed air, carbon dioxide or liquid air are 

 used in connection with spray tanks which may be made air tight 

 by screwing on tight covers after the spray material is placed in the 

 tank. The gas tank is connected with the spray tank by a tight, 

 metal-covered tube. The liquid is then forced out from the bottom 

 of the spray tank through a pipe connected with the hose and 

 extension rod. 



