SPRAYING AND DUSTING APPARATUS 



61 



to them are that they are heavy to carry, thus limiting their use 

 to a small area; they frequently slop over, and wet the carrier's 

 back and the pumps do not develop sufficient pressure for some 

 kinds of work. Consequently they are not as much used as 

 formerly, but are useful for the pur- 

 poses indicated, and inasmuch as 

 they may also be used as a simple 

 bucket pump, they are to be pre- 

 ferred to them. The cost varies 

 from $8 to $12 or $15. 



Compressed-air Sprayers. In re- 

 cent years the compressed air sprayer 

 has come into favor for use in small 

 gardens. It consists of a brass tank 



FIG. 28. Bucket pump mounted in 

 bucket, and mounted in tank with 

 agitator. (Courtesy Deming Co.) 



FIG. 29. Bucket pump with 

 large air-chamber, which will 

 maintain a good pressure. 

 (Courtesy F. E. Myers& Bro.) 



which is filled with the liquid; the air is compressed by an 

 air-pump, and spraying continues until the pressure runs down, 

 when a stopcock is turned and the pressure is again raised by 

 pumping. The tank holds from 3 to 5 gallons, and is carried 

 beneath one arm, slung by a strap over the other shoulder. The 

 chief objections to this type are that it is not very convenient 

 to fill, though the newer models are much improved, is not 



