1S78 



The Cornell Reading-Courses 



All hand separators have the number of revolutions of the crank neces- 

 sary for efficient separation marked on the crank, and all power separators 

 have instructions as to the proper rate of speed at which they should be op- 



Revolutiona 60 54 50 60 SO 45 38 55 45 60 SO 



Separator 1 Separator 2 Separator 3 Separator 4 Separator 5 



Fig. 85. — • A diagram representing percentage of fat in cream as influenced by the number 

 of revolutions of the separator crank per minute 



crated. Naturally the manufacturer is careful not to state a rate of 

 speed for his separator that will give results just above the border line 

 of poor separation. If these instructions given by the manufacturers are 



Revolutions 60 54 50 60 50 45 38 SS 45 60 50 



Separator 1 Separator 2 Separator 3 Separator 4 Separator 6 



Fig. 86. — A diagram representing percentage of fat in skimmed milk as influenced by 

 the number of revolutions of the separator crank per minute 



followed carefully, the separation of milk will be found to be thorough. 

 The fact is, however, that the rate of speed may drop several hundred 

 revolutions of the bowl below the number designated for correct speed, and 



