Insects of Shade Trees and Their Control. 91 
BARREL PUMPS. 
The. barrel hand-pump outfit (fig. 9) has a capacity of about 50 
gallons, and may be used to advantage on a limited number of trees. 
With a good barrel pump considerable spraying may be done in a 
satisfactory manner. The working parts of the pump should be of 
bronze, brass, or other noncorrosive material, and the valves and 
plungers should be readily accessible and easily repaired. The pump 
should be provided with an efficient agitator, either of the paddle 
or rotary type. To insure a good pressure and uniform discharge 
of the spray ma- 
terial the pump 
should be provided 
with an adequate 
mo chamber, £0 
which a pressure 
gauge may be at- 
tached if desired. 
The pump may be 
mounted either on 
the head or side of 
the barrel, and the 
whole outfit placed 
on skids or on a 
wagon. On hilly 
land it is preferable 
to have the barrel 
in a horizontal posi- 
tion. 
DOUBLE- ACTION 
HAND PUMPS. Fig. 8.—Compressed-air sprayer for small spraying op- 
erations; no pumping is required while spraying. 
The double-action (Quaintance and Siegler.) 
hand pumps (fig. 
10) usually are employed in connection with spray tanks of greater 
capacity than a barrel, as the 150 or 200 gallon half-round tank used 
in place of the wagon bed. The pump, which may be either vertical 
or horizontal, is fastened to a small platform, and placed on top of 
the tank or on a platform at the hind end of the wagon. <A suction 
hose extends into the spray tank. A barrel or 100-gallon hogshead 
may be used, however, and placed at one end of the wagon bed or plat- 
form, thus leaving plenty of room for the pump and operator. When 
properly used these double-acting, double-cylinder pumps furnish 
adequate pressure for two leads of hose, and for single or double 
nozzles. They furnish an outfit intermediate in cost and capacity 
between the barrel pump and the gasoline or other power sprayer. 
