PHYSICAL AND CHEMICAL EXAMINATION OF MILK 



161 



the intermediate graduation is also correct. Care should be 

 taken to remove all moisture from the neck oT the bottle before 

 the tester is inserted and the tester must be dry. The moisture 



Fig. 51. 



Fig. 50. 



test, 

 Sta.) 



Fig. 52. Fig. 53. 



Figs. 50-53. Scales for weighing samples of cream by the Babcock 

 (Circular of Information No. 27, July, 1911, Univ. of Wis. Agri. Exp. 



can be removed with strips of filter paper. No air-bubbles should 

 adhere to the plunger, and the temperature of the bottles, the 

 liquid, and the test bottle should be the same. 



Another method of testing the accuracy of the graduation is as 



11 



