64 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



toes or other row crops may be sprayed with a barrel pump much 

 more quickly than by hand. In buying a row attachment, be sure 

 that it is adjustable for rows of different widths. A good barrel 

 pump costs from $15 to $25. Most of the pumps sold -at $10 

 or less are too light to do effective work or are not well constructed. 

 Numerous pump companies advertise in the agricultural papers, 

 and after considering the following points one may select a 

 suitable pump from their catalogs: 



New type of compressed-air sprayer with 

 separate pump. (E. C. Brown Co.) 



FIG. 32.-Compressed- 

 air sprayer with 

 section of tank 

 removed to show 

 air pump within. 



1. The pump should be guaranteed to furnish four nozzles 

 at 80 to 100 pounds' pressure with ordinary pumping. 



2. It should have a large air chamber within the barrel, and 

 not projecting above it. 



3. As few of the working parts of the pump as possible should 

 be above the head of the barrel, as exposed parts are. easily 

 broken. 



4. The cylinder, plunger, valves and working parts should be of 

 brass. The handles and other parts commonly, made of cast iron 

 are much more durable when made of malleable or galvanized iron. 



