98 Farmers’ Bulletin 1169. 
Rotary pumps (fig. 15) connected with the spray engine are 
employed for the same purpose and are more satisfactory where 
the water contains considerable sediment. Rotary pumps are fre- 
quently used in districts where the water is drawn from the irrigation 
ditches. 
PRESSURE REGULATOR. 
This is a useful attachment for the regulation of the pressure. 
By its proper adjustment a uniform spray is obtained at the pres- 
sure desired. . 
MISCELLANEOUS SPRAYING SUPPLIES. 
The following accessories should be provided : 
Scales—A good pair of scales should be used for weighing out the 
spray materials. Guess-work is poor economy. 
Gasoline-power spraying outfit with carpenter’s horse type of tower and rotary 
pump tank filler. (Quaintance and Siegler.) 
Fie. 15: 
Galvanized buckets—These are useful for measuring liquid spray 
materials, especially when gallons and smaller quantities are marked 
on them by means of graduating dents. 
Strainer —Before admitting spray material into the spray tank, it 
should first pass through a screen (fig. 16) to remove all of the coarse 
particles. The opening in the spray tank for filling purposes is 
usually provided with a removable brass screen. 
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