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DAIRY LABORATORY GUIDE 



EXERCISE 8 



SPEED OF THE BABCOCK TESTER 



Object: To determine the effect from a variation in 

 speed of the tester upon the percentage reading of butter-fat. 



Apparatus : Samples of milk, skimmilk, and cream; three 

 bottles for each sample to be tested; and testing outfit. 



Steps: 1. Number each set of bottles 1, 2, and 3; then 

 prepare the samples by pouring. 



2. Measure 17.5 c. c. of milk into each of the three 

 whole-milk bottles and 17.5 c. c. of skimmilk into each of 

 the skimmilk bottles. Then weigh 18 gr. of cream into 

 each of the cream bottles. 



3. Complete the test as usual but run the sets at the 

 different speeds indicated below. 



4. The testers are not all geared alike; so be sure to use 

 the same tester throughout the exercise; otherwise the final 

 results will be of no comparative value 



Data: 



Application: 1 Determine the number of turns of the 

 handle per minute for each speed. Likewise compute the 

 revolutions of the tester. 



