Cream Testing. 



81 



FIG. 34. Scales used for weighing 

 cream in the Babcock test. 



mining the strength of sulfuric acid, and in testing the 



accuracy of test bottles and pipettes. 



Cream scales similar to that shown in fig. 35 permit 



the weighing of two or four samples of cream at a time 



with only one taring of 



the bottles, which great- 

 ly facilitates the work of 



testing the cream. 



In testing cream by 



weight, the test bottle is 



first weighed empty, and 



again when 9 or 18 



grams of cream have been placed in it; the difference 



between the two figures gives the weight of cream taken 



for the test. If the cream 

 contains less than 30 per 

 cent, of fat, the regular 

 milk test bottle can also 

 be used for testing the 



II j cream, if not much more 



[ than 5 grams are weighed 



out; if more cream is 

 taken, or if this is richer 

 than 30 per cent., it is 

 advisable to use cream 

 bottles. 



The operator should be 



FIG. 35. Torsion balance used for careful in weighing the 

 weighing cream in the Babcock test. 



cream not to spill it on 



the outside of the test bottle. If less than 18 grams 

 of cream has been weighed into the bottle sufficient 



6 



