l6 QUESTIONS AND ANSWERS 



the indicator means loo turns of the separator bowl 

 and spindle. Therefore, in lo seconds the bowl re- 

 volves loo X 12, or 1,200 times. Ten seconds is 

 one-sixth of a minute. Therefore, in a minute the 

 bowl revolves 1,200X6 times, 7,200 times. 



The speed of all modern separators can be easily 

 figured in this way. Each turn of the indicator 

 on the 



De Laval means 100 turns of the bowl. 



United States means 100 turns of the bowl. 



Simplex means 50 turns of the bowl. 



Tubular means 250 turns of the bowl. 



Sharpies means 250 turns of the bowl. 



Upon what does the centrifugal force of a revolving 

 separator bowl depend? 



1. It varies in direct proportion to the diameter 

 of the bowl, i. e., the greater the diameter the less 

 speed is required in order to get a certain force. 



2. It varies in quadratic proportion to the speed 

 of the machine, i. e., if the speed is doubled the 

 centrifugal force is increased four times. 



What are the disadvantages of a large bowl? 



1. It more easily gets out of balance. 



2. It is harder to keep on bearings. 



3. It is heavy and hard to handle. 



How should a separator bowl be flushed after 

 running? 



1. With skim milk. 



2. With warm water at about the same tem- 

 perature as the milk. 



