214 



The Spraying of Plants. 



durable, and can be recommended with confidence. Fig. 28 

 illustrates another form very similar to the preceding. The 

 air chamber surrounds the upper half of the pump, causing the 

 enlargement. These two pumps are amongst the most compact 

 and serviceable ones now sold. 



FIG. 28. A good barrel pump, with a return pipe for agitation, and a strainer. 



Fig. 29 shows a style of pump of which there are several 

 modifications (see also Fig. 34). The most striking feature of 

 this type is the very large air chamber. Many of these sprayers 

 are in use, and as they appear to give satisfaction they must 

 have points of decided merit. Such air chambers are of par- 

 ticular value upon power sprayers. 



Several manufacturers advertise a horizontal-acting pump, 

 as shown in Fig. 30. These are of various sizes, the cylinder 



