PICKERING SPRAYS. 
43 
* 
night, placing the copper sulphate just beneath the surface of the 
water. This may be conveniently done the evening before the spray 
is to be applied. Remove the gunny sack, stir the solution of copper 
sulphate with a wooden paddle, make to 50 gallons with water, and 
stir again. Keep the barrel or container covered. The barrel or 
container must not leak. The solution thus prepared contains 1 
pound of copper sulphate per gallon. Smaller amounts of the copper 
sulphate may be dissolved, using the same proportions of copper 
sulphate and water 
SATURATED LIMEWATER. 
Place 2 pounds of unslaked lime of a good grade in a clean barrel 
or other wooden container, sprinkle with a little water, and let stand. 
In a few minutes, when the lime crumbles, add 2 or 3 quarts of water. 
Stir the lime and water until a smooth paste is formed, adding a 
little more water if needed. Finally, fill the barrel and stir six or 
eight times, allowing the insoluble particles of the lime to settle after 
/AfS/OE AGE ^ O/? "? 
TH/CKA/ESSES 
or 
CHEESECLOTH 
W/GE SCREEAt OOTS/DE-S 
COA/ZSEC — \ L/ME 
Fig. 1.— Apparatus for filtering limewater. 
each stirring. Then cover and let stand until used. The limewater 
may be drawn from the barrel by means of a faucet placed 3 or 4 
inches from the bottom. The limewater should be -passed through 
a strainer (fig. 1) before it is allowed to flow into the mixing tank. 
If preferred, the clear limewater -may be siphoned off from the top. 
of the barrel directly into the mixing tank. 
In making limewater for spraying on a commercial scale, several 
pounds of lime may be slaked in a large tank, water added, and the 
mixture stirred by means of a mechanical stirrer for 5 or 10 minutes. 
The clear limewater may be drawn from the top of the tank almost 
immediately by arranging a float with attached hose. If from 15 
to 20 minutes are allowed for the lime particles to settle, the clear 
limewater may be drawn from a spigot placed 6 or 8 inches from the 
bottom of the tank. If desired, slaked lime may be placed in bar- 
rels, allowing about 4 pounds of paste to a barrel, water added, and 
the mixture in each barrel stirred six or eight times in turn. The 
suspended particles will settle in about 10 minutes, when the clear 
