THE FARM SEPARATOR 83 



LABORATORY PROBLEMS 



XIII. To Study the Principles of the Centrifugal Cream 

 Separator 



1. Study the various parts of the separator and 

 learn how to assemble them. Care must be exercised 

 to see that the various parts are not damaged by drop- 

 ping them or by jamming the parts together. 



2. Oil the bearings well with good hand separator 

 oil. 



3. Determine the speed of the separator bowl per 

 minute. This can easily be done by counting the revo- 

 lutions of the bowl while the operator slowly turns the 

 handle one complete revolution. Then multiply the 

 number obtained by the number of revolutions made 

 by the handle per minute. 



4. Slowly bring the separator up to the proper 

 speed, which is usually indicated on the handle. When 

 at about one-fourth speed fill the bowl with lukewarm 

 water. The object of this is to see if the bowl leaks. 

 If it does, stop at once and locate the trouble. 



5. If the milk to be used for this experiment is 

 cold, warm it to a temperature of about 85 degrees. 

 Stir well, weigh and place in milk container on the 

 separator. 



6. When all the foregoing observations have been 

 made and precautions have been taken, carefully bring 

 the separator bowl to full speed and slowly open the 

 feed valve so that the rate of inflow is normal. There 

 is usually a float to regulate this important matter. 

 The exact time of starting the flow of milk should 

 be observed and recorded. 



7. Continue to separate the milk, being very care- 

 ful to see that the correct speed is maintained. This 



