is over fill the barrel with -water to a point 3 inches from the 

 top. Boil as vigorously as possible without overflowing the 

 barrel. The material is strained into another barrel and set 

 aside for future use if uot immediately required. 



HOW TO DILUTE WITH WATER. 



The formula given is the one followed at this station and 

 the wash invariably had a specific gravity of 1.024. To de- 

 stroy San Jose scale requires a specific gravity of 1.03. The 

 following rule is used. Divide the specific gravity of the 

 boiled wash by the specific gravity required for treatment 

 and the quotient represents the number of dilutions. 

 Example: .1.024 divided by 1.03 equals 8. Therefore the 

 wasli is to be diluted 1 part to 8 parts of water. If the specific 

 gravity of the wash is 1.027 the dilution would be 1 to 9. 



A simple) way to test the specific gravity is by the use of 

 the spray hydrometer, which costs about $1.00. This instru- 

 ment is provided with a scale. The wash is allowed to cool 

 and the hydrometer is let down in it gently until it floats. 

 The specific gravity then is shown by the figures at the sur- 

 face of the liquid. The dilution may be marked on the 

 barrel with chalk when stored away. 



This wash may be fire boiled. A large kettle is required 

 and there should be an excess of about 10 gallons of water 

 at the beginning to compensate for the loss due to evapora- 

 tion. This process is much more laborious than when steam 

 is used. 



FIRE BOILED WASH OLD FORMULA. 



There are a number of formulas for making this wash, 

 all equally good. 



Directions for making should be carefully followed, and a 

 good grade of lime used. This method is used by some who 

 require only a small quantity of the wash. The principal 

 disadvantage is the lack of uniformity, and the necessity of 

 using it fresh. 



Sulfur 20 Ibs. 



Lime 16 Ibs. 



Water 50 gallons. 



Mix the sulfur with a small quantity of Avater to form a 

 paste, then add it to about 15 gallons of boiling hot water in 

 an iron kettle. Then add the lime slowly and stir constantly. 

 Boil until a greenish yellow or am'ber color is obtained and 

 all the yellow sulfur has disappeared. Transfer to a 50 gal- 

 lon spray barrel and fill the barrel with water. It must be 

 used the same day when made. 



