39 

 plant to plant. The ilustration Fig. 23, represents a very good 



Figure 23 



type as the pressure may be cut off or turned on instantly. 

 Next to this form the author believes a high class globe valve is 



best. 



HOSE — Only the high class high-pressure hose is suitable 

 for spraying. In the author 's experience he has found 3|8 

 in. thick walled hose superior to the larger sizes. The larger 

 sized hose has a tendeney to kink, and when a hose kinks a few 

 times in the same place it is a short time only until a leak 

 appears. 



GENERAL REMARKS CONCERNING SPRAYERS 



AND SPRAYING 



No matter what the work, the sprayer used shonld be cap- 

 able of maintaining a good pressure, most satisfactory results 

 being obtained from those furnishing from 80 to 100 pounds 

 per sq.in. For all but the smaller hand machines it will be 

 found advantagcous to have a pressure guage in the sight of the 

 man who operates the pump, as this aids materially in maintain- 

 ing an even pressure. 



The higher the pressure, the coarser the nozzles may be 

 and stil preserve a fog like spray ; the coarser the nozzle the less 

 liable it is to clog. 



The general tendeney of persons unused to spraying is 

 to procure a pump too small for their needs. Without doubt 



