92 Farmers’ Bulletin 1169. 
A common defect is lack of adequate facilites for agitation, although 
tanks are available in which this deficiency is corrected to some 
extent. 
SPRAYING OUTFITS FOR LARGE OPERATIONS. 
Spraying outfits in larger towns and cities are generally best op- 
erated by gasoline engines. In an emergency even the fire engines 
may be utilized for this purpose in some communities. 
GASOLINE-POWER SPRAYERS. 
Spray pumps, operated by gasoline engines, are by far the most 
useful type of sprayer and are made in various sizes and styles to suit 
almost any requirement. 
Special outfits have been 
designed for hillside 
spraying, vineyard spray- 
ing, shade-tree spraying, 
etc. 
The smallest power 
Sprayers are nothing 
more than ordinary 
barrel pumps equipped 
with a small engine of 1 
to 14 horsepower. These 
small mechanical outfits 
are higher in price than 
the hand pump, but are 
usually worth the addi- 
tional first cost. They 
may be operated at a 
comparatively small cost 
Fic. 9.—Barrel pump, suitable for spraying a few and will give a steadier 
medium-sized trees. (Quaintance and Siegler.) spray and at a higher 
pressure than will the pumps operated by hand. With the small 
power outfit one lead of hose is generally used, but two leads may be 
employed if the pump has sufficient capacity. 
Large power sprayers (see title-page) are made with pumps of 
from two to four cylinders, having a capacity of 5 to 50 or more gal- 
lons per minute under a pressure of 150 to 300 pounds. These spray- 
ers are operated by gasoline engines of from 2 to 12 horsepower. For 
the four-cylinder pumps of large capacity, auto-type 4-cylinder en- 
eines of 10 to 12 horsepower are sometimes used. 
S Adapted from Farmers’ Bulletin 908. 
