62 



Testing Milk and Its Products. 



The cover of the tester should have an opening pro- 

 vided with a sliding damper or some arrangement by 

 which it can be closed when desired. If whole milk or 

 cream is being tested, this hole should be open so that a 

 draft of air may enter the chamber dur- 

 ing the whirling, and force the steam 

 into the exhaust pipe. If skim milk is 

 being tested, the opening in the cover! 

 should be closed. This 

 shuts off the draft of 

 air, and the exhaust 

 steam heats the test 

 bottles during whirl- 

 ing to 200 F. in some 

 cases. This high tem- 

 perature aids in sepa- 

 rating the fat in skim 

 milk and gives fairly FIG. 23. 



steam turbine 



24. Type ui liabcock turbine testers 

 (for testing cream in 0-in. cream bottles). 



testers. 



correct tests of 

 samples containing 

 less than one-tenth 

 per cent, fat (98). 

 Some turbine test- 

 ers are provided 

 with holes in the 

 overs and damp- 

 ers and a thermo- 

 meter is placed in 

 the cover. 



