Dairy laboratory manual and note book . Trowbridge plug andmethod of using. EXERCISE 3 (Continued)Data. (19) Style of bottle Bottle No. Variation 5% mark ? Variation at upper mark ! (20) EXERCISE 4. Object.—To make a test of milk for butterfat, by the Babcock —Two whole milk bottles; a cc. pipette; acid measure; acid; sample of whole milk; two sample bottles; hot water 1. Practice using the pipette with water until you can reasonably adjust the amount to be taken; Caf cc. i8y. Correct position for filling bottles. Step 2. Always have milk betwee
Dairy laboratory manual and note book . Trowbridge plug andmethod of using. EXERCISE 3 (Continued)Data. (19) Style of bottle Bottle No. Variation 5% mark ? Variation at upper mark ! (20) EXERCISE 4. Object.—To make a test of milk for butterfat, by the Babcock —Two whole milk bottles; a cc. pipette; acid measure; acid; sample of whole milk; two sample bottles; hot water 1. Practice using the pipette with water until you can reasonably adjust the amount to be taken; Caf cc. i8y. Correct position for filling bottles. Step 2. Always have milk between 60° and 70° F. before drawing sample with 3. Mix the milk thoroughly by pouring from one vessel into another before drawing sample. Always pour down the side of the 4. Put cc. of milk into each of two whole milk bottles. Allow the milk to run down along the neck by holding the pipette and bottle at an angle of about 60°. (Letter one sample A and the other B.)Step 5. To each bottle add 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°
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