Grade 



Date . 



EXERCISE 18. 



(37) 



Object. — To determine the effect of measuring cream as compared with 



weighing it. 

 Apparatus. — Sample of cream; Babcock outfit; 2 9-gram and 4 18-gram 



cream bottles. 

 Step 1. Measure into each of two 18-gram bottles 17.6 cc. of cream. 

 Step 2. Add 17.5 cc. of acid, rotate well and allow to stand until mixture 



turns black, then add hot water up to the neck of the bottle. 

 Step 3. Weigh out 18 grams of cream into each of two 18-gram bottles; 



Add acid and water as in step 2. 

 Step 4. Weigh into each of two 9-gram bottles 9 grams of cream and test 



in the usual manner. 



Report. 



1. Which test should be the correct one? 



2. Give the advantages and disadvantages of weighing out cream for 

 a test. 



3. With how many pounds of fat would a cream patron be over-credited 

 if he delivered 467 pounds of cream and was allowed the highest test? 



4. How much would he be short if paid by the lowest test, butter being 

 worth 30 cents per pound, overrun being 14 per cent? 



