Dairy laboratory manual and note book . .5 cc. of sulphuric acid ( to s. g.), using an acid measure. Turn bottle slowly as acid is added, allowing acid to run down the sides of the neck. EXERCISE 4 (Continued) (21) Step 6. Agitate each bottle until the curd is all dissolved, by giving it arotary motion as soon as acid is added. Step 7. Put them into a centrifugal machine, whirl five minutes, fill to theneck with water about 130° F., whirl two minutes, fill to about the 9per cent mark, whirl one minute. Set in hot water bath 130°-140° Fwith water around necks for 5 minutes, then read f
Dairy laboratory manual and note book . .5 cc. of sulphuric acid ( to s. g.), using an acid measure. Turn bottle slowly as acid is added, allowing acid to run down the sides of the neck. EXERCISE 4 (Continued) (21) Step 6. Agitate each bottle until the curd is all dissolved, by giving it arotary motion as soon as acid is added. Step 7. Put them into a centrifugal machine, whirl five minutes, fill to theneck with water about 130° F., whirl two minutes, fill to about the 9per cent mark, whirl one minute. Set in hot water bath 130°-140° Fwith water around necks for 5 minutes, then read fat. Note.—Read the whole milk test from the top of the upper meniscus to the bottomof the lower meniscus. Report. Bottle No A B %fat 1. Below give reasons for having the milk at 60° to 70°. 2. Why is the milk poured from one vessel to anotherbefore sampling? 3. Explain the ac-tion of acid in the test. 4 Why should eachsample of milk be testedin duplicate? 5 What is the colorof the fat column? Eight-bottle hand tester. Farm - ~~1 B ^-6 -Si. *> ±-5 §-4 E^3 A =r-Z ~1 ~0 Correct methodof taking readingon whole milkbottles. Fromthe extreme lowermeniscus to thetop of the uppermeniscus. (22) EXERCISE 5. Object.—To test whole milk for fat content by Babcock method. Repeat Exercise 4. Test as many samples of milk as possible during thelaboratory period. Report. Bottle No % fat. ?! A 1b 1. Try to account for any difference in tests between samples A andB in each case. 2. What would be the pounds of butterfat given by a cow giving 8000pounds of milk per year with the fat test of your first sample? 3. What would be its total value at 38 cents a pound? 4. Why is cc. of milk used for the test? 5. Why are the bottles set in water at 130° F. before reading? EXERCISE 6. (23) Object.—To test cream for fat content by Babcock —Two cream bottles; acid measure; acid; cc. pipette; sample of cream; two mixing beakers; scale
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