60 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



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 



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

 not maintain satisfactory pressure; b, & better type of busket pump 

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



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. 



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 foot-rest 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 

 crops as tomatoes, melons, etc., which cover the ground so that 

 it is difficult to drive through them without injuring the vines, 

 crops growing on steep hillsides, or for a small acreage of any 

 garden crops, small fruits, or small trees. The main objections 



