MODERN METHODS OF TESTING MILK 



form of hand-centrifuge is 

 shown in Fig. 41. Special 

 graduated tubes (Fig. 42) 

 are made to use in this. The 

 milk to be tested is stirred 

 thoroughly, the tube is filled 

 to the highest mark, placed 

 in the pocket of the centri- 

 fuge and whirled several 

 minutes. The sediment col- 

 lects at the bottom and can 

 be easily measured by read- 

 ing the amount on the scale. 

 In Fig. 43 is shown a Bausch 

 and Lomb electric centrifuge. 

 This company also furnishes 

 hand-centrifuges capable of 



FIG. 41 HAND-CENTRIFUGE . .. 



FOR SEDIMENTATION WORK 3>ooo to 8,ooo revolutions per 



FIG. 42 TUBE FOR 

 SEDIMENTATION WORK 



FIG. 43 BAUSCH & LOMB 



ELECTRIC CENTRIFUGE 

 Speed 1,000 revolutions per minute 



