Spraying Devices and Machinery. 209 



be substituted for the knapsack sprayers. 

 Statements are frequently seen, asserting 

 that these and similar pumps may be 

 used successfully in orchard work, and 

 so they may. But the work is so tedious 

 and slow, that the experiment will rarely 

 be tried more than once. A larger pump 

 will throw a greater quantity of liquid and 

 throw it easier, so that it is a mistake to 

 purchase a small pump for any but very 

 limited plantations. Fig. 25 represents 

 another serviceable pump of this kind. 



The greatest variety of pumps may be 

 found among those which are suited for work on a barrel, or 



Vfcu 



FIG. 24. Bucket pump. 



FIG. 25. Improved bucket pump. 



tank, and here is where the greatest difficulty occurs in making 

 a selection. Items of cylinders, pistons, handles, air chambers, 



