78 Testing Mm and Its Products. 



In testing cream by the Babcock test, 

 one of two methods may be followed: 



First, one of the special forms of cream 

 test bottles which have been devised is 

 used; or, 



Second, only sufficient cream to be 

 tested in a regular Babcock milk test 

 bottle is taken for a sample. 



89. Cream test bottles. Three special 

 forms of bottles have been devised for 

 testing samples of cream by the Babcock 

 test; two of these were suggested by 

 Bartlett of Maine, 1 in 1892; one with a 

 long detachable neck designed for test- 

 ing very rich cream (up to 35 per cent, 

 fat), and the other with a neck widened 

 into a bulb in the middle so as to allow 

 a large quantity of fat to be measured. 

 The former kind of cream bottle never 

 met with favor among operators; its neck 

 was too long to be used in the ordinary 

 centrifugal machines, and was not at- 

 tached until the base portion, containing 

 the cream, acid and first filling with 

 water, had been whirled. 



90. The bulb-necked cream bottles (Fig. 

 31), allow the testing of cream contain- 



FIG. 31. The bulb- ing 23 or 25 per cent, of fat, the usual 



necked cream 



test bottle. quantity of cream (18 grams) being 



measured out. The neck is graduated from to 23 per 



i Maine experiment station, bulletins 3 and 4 (second series). 



