Modifications in Structure of Bowl 185 



this arrangement is known as a "cream screw," and 

 affects the amount of cream by placing the cream 

 outlet nearer or farther from the center of the bowl; 

 the nearer the center the cream screw is turned, the 

 thicker will be the cream and the smaller the amount. 

 Some of the separators change the proportion of 

 cream by increasing or decreasing the capacity of the 

 skimmed milk outlet. If the capacity of the skim- 

 med milk outlet be decreased, necessarily the amount 

 of the cream will be increased, and vice versa. 



The temperature of the milk only slightly affects 

 the proportion of skimmed milk and cream. The 

 warmer the milk, the more fluid it is, and the faster it 

 will pass through the various openings of the machine. 

 Slightly more milk at 85 will run through the same 

 inflow than at 70, and a large part of this increase 

 will be found in the cream. The pressure of the milk 

 in the vat above the machine will materially affect the 

 rate of inflow, and a few inches will make a difference 

 of two or three 

 hundred pounds 

 per hour on a 

 large -sized ma- 

 chine. 



Contrivances 

 in the bowl to 

 increase the effi- 

 ciency of sepa- 

 ration. In the 



first Separators Fig. 23. a, Sectional view of old style "Hollow" 



-,,,,, separator bowl; b, Sectional view of "Alpha- Disc" 

 made, the bowl separator bowl. 



