SPRAYING AND DUSTING APPARATUS 



61 



Many firms are now selling these pumps mounted in large 

 galvanized-iron covered buckets, and furnished with a mechanical 

 agitator. This is a desirable arrangement, for the buckets are 

 much larger than those ordinarily used, thus saving frequent 

 filling, while the cover prevents slopping, and the pump is always 

 ready for use without the necessity of hunting up a bucket and 

 then cleaning it, which is necessary after using a bucket which 

 is used for other purposes. 



Bucket pumps are useful for small gardens or for a few small 

 trees, or bushes. 



KIG. 27. a, a cheap type of bucket pump with no air-chamber, which 

 will not maintain satisfactory pressure; b, a better type of bucket 

 pump with small air-chamber. (Courtesy Deming Co.) 



Knapsack Pumps. The knapsack pump consists of a copper 

 or galvanized-iron tank carried on the back like a knapsack, in 

 which is mounted a bucket pump with a lever handle for pumping. 

 In the better makes this handle is detachable, and a plain handle 

 may be attached so that the tank may be used as a simple bucket 

 pump, for which a footrest is attached to the tank. The pump 

 should have a good mechanical agitator. The copper tanks 

 are preferable, for Bordeaux mixture will soon eat through gal- 

 vanized iron. Knapsack pumps are useful for spraying such 



