i88o 



The Cornell Reading-Courses 



percentage of the total, and it aflfects only slightly the percentage of fat in 

 the cream. Under average conditions these factors are not of much im- 

 portance if approximately the same quantities of milk and flushing material 

 are used each time. 



Slime deposit. — If the passages for the cream and the skimmed milk in a 

 separator are closed or partly closed by slime deposit, the efficiency of the 

 separator will be affected. The slime deposit is composed of fibrin from 



Fig. 88. — The barn is not a desirable location for a separator 



the milk and of dirt, and it accumulates in a greater or less amount even 

 from the best of milk. Generally, this accumulation is not sufficient to 

 cause excessive loss of fat in the skimmed milk if the separator is run the 

 length of time of the average separation. The length of the period of sep- 

 aration will be considered later in the lesson. 



ADVANTAGES OF THE CENTRIFUGAL METHOD OF CREAM SEPARATION OVER 



THE GRAVITY METHODS 



I. Ordinarily, fewer utensils are used in the centrifugal method than in 

 the gravity methods. If the herd is composed of only two or three cows, 

 this may not be true; but if there are eight to ten cows, it is true. 



