142 MANAGEMENT OF DAIRY PLANTS 



Cost of Operation. — If the cost per kilowatt hour is 5 cents, 

 then the cost per horse power is 3 3/4 cents. 



Power is often saved when using electric power by installing 

 smaller units, that is, using separate motors for the various 

 machines or departments and motors of the proper size. This 

 system prevents the use of a 15 to 25 horse-power engine for 

 yielding one or two horse power which is usually sufficient for 

 stirring the cream or for pumping water. The system of indi- 

 vidual motors furthermore reduces the amount of shafting and 

 as a result the amount of loss due to friction. 



