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. FinaUy, fill the barrel and stir six or 

 eight times, allowing the insoluble particles of the lime to settle after 



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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 



