SPRAYING AND DUSTING APPARATUS 



67 



8. The valves, with their seats or cages, should be readily 

 removable for cleaning, and should be so constructed that they 

 remain evenly ground. 



All of these points may not be embodied in any one pump, 

 but most of the better pump manufacturers are embodying these 

 features in their newer models, a good example of which is shown 

 in Fig. 34. 



Barrel, knapsack, and 

 bucket pumps are manufac- 

 tured which have separate 

 tanks for oil and water 

 which are mixed in a de- 

 sired proportion and sprayed 

 as a mechanical mixture. 

 They have been found un- 

 reliable in controlling the 

 amount of oil, and are not 

 now in general use. 



Horizontal Pumps. For 

 larger orchards and shade 

 trees, the double-acting 

 horizontal pumps which are 

 operated with a lever, as 

 shown' in Fig. 35, furnish 

 more power and conse- 

 quently make more rapid 

 work possible. They are 

 -mounted on 100- or 150- 

 gallon tanks and may be 

 arranged for filling the tank where running water is not available. 

 These pumps cost from $30 to $50 and will maintain 100 to 125 

 pounds pressure with four to eight nozzles. They are usually 

 used with two men spraying and another driving and pumping, 

 or a fourth man pumps and changes places now and then with 

 the driver, as the operation of this type is rather too heavy for 

 one man constantly. 



FIG. 37 .-Gasoline power sprayer, complete. 

 Note wide tread steel wheels, steel tower 

 on tank, and intake hose for filling tank 

 where running water is not available; 3 

 h.p., 4-cycle gasoline engine, will main- 

 tain 10 nozzles at 200 Ihs. pressure. 



