76 CENTRIFUGAL SEPARATION 



to the periphery of the bowl, into very thin layers, augmenting 

 the separating efficiency. 



In order to avoid infringement on the Alpha De Laval patent 

 of discs, other manufacturers have constructed a large assort- 

 ment of different types of somewhat similar internal contrivances, 

 all of which are intended for the same purpose. One distinct 

 deviation from the horizontal or coneshaped disc is the vertical 

 blade arrangement of the Simplex separator in which numerous 



Fig. 7. Simplex blades 



Courtesy D. H. Burrell & Co. 



Fig-. 6. Simplex separator 

 Courtesy D. H. Burrell & Co. 



curved tin blades, attached to a ring around the central tube 

 extend from the central tube to the periphery of the bowl. These 

 wings or blades, similar to the discs, are kept at a slight distance 

 from each other by carrying small projections on their surfaces 

 and in this way divide the milk into a multitude of very thin 

 layers. 



The Skim Milk Outlet. As previously stated, the layer of 

 milk nearest the wall, or periphery of the bowl, contains the least 

 fat and represents the skim milk. The skim milk is discharged 

 either from the top or from the bottom of the bowl. The skim 

 milk flows through small tubes from the extreme periphery to 

 near the center of the bowl where it is discharged. The purpose 



