108 



CONDITIONS AFFECTING RICHNESS OF CREAM 



SPEED 



L0W SPEED 



.o$5 in SKinmtK 



H/6H3PEED 



Pl8T- 13 



However, the effect of the speed of the separator varies to 

 some extent with the richness of the cream for which the sep- 

 arator is set. When set for rich cream there is a greater difference 

 in the per cent of fat of the resulting cream between high speed 

 and low speed than when set for thin cream. This is due to the 

 fact that when the machine is adjusted to produce rich cream, 

 the relative difference between the distance of the skim milk and 

 cream outlets from the center of the bowl is proportionately 

 greater, the proportion of skim milk discharged is larger, less 

 milk is left to pass out with the cream, the cream is richer and 

 the influence of the speed is greater than when the separator is 

 set for thin cream. When set for thin cream the relative dif- 

 ference between the distance of the skim milk and cream outlets 

 from the center is smaller, the effect of the speed on the capacity 

 of the skim milk and cream discharge is more nearly equalized, 

 causing less variation in the richness of the cream due to changes 

 in speed. 



In separators, or under conditions, causing the cream outlet 

 to be located farther from the center than the skim milk outlet, 

 a high speed will even yield less skim milk, more cream and 

 thinner cream than a low speed. This is the case with the 

 Simplex separator, for instance, when adjusted to produce thin 



