l68 MODERN METHODS OF TESTING MILK 



lects at the bottom and can be easily measured by 

 reading the amount on the scale. In Fig. 43 is shown 

 a Bausch and Lomb electric centrifuge. This com- 

 pany also furnishes hand-centri- 

 fuges capable of 3,000 to 8,000 

 revolutions per minute. Their 

 centrifuges and tubes can be 

 used also in testing for fat in 

 milk by the Babcock method. 

 In Fig. 44 is shown another FIG 



form of electrical centrifuge GLASS FOR COLLECTING 



t . i . , e SEDIMENT IN MILK 



which is very satisfactory for 

 collecting sediments. 



Settling test for dirt. A method less accurate, but 

 fairly satisfactory in the absence of any better means, 

 is to place about 4 ounces of milk in a test-glass (Fig. 

 45) and let it stand for one or two hours. The dirt 

 collects in the bottom and its amount can be roughly 

 estimated by the eye. 



