180 Milk and Its Products 
to fill from the outside toward the center. The cen- 
trifugal force acting more strongly upon those parts 
of the milk which have the greatest specific gravity, 
they are thrown to the extreme outside, and the 
lighter portions, the fat globules, with whatever may 
adhere to them, are forced to the center. Attached 
to the extreme outer edge of the bowl are one or 
more tubes, which, bending inward along the side of 
the bowl, find an opening near the center. These 
are the outlets for the skimmed milk. From the 
extreme center of the bowl, also leading to the out- 
side, is the cream‘ outlet. When the bowl becomes filled 
with milk, the centrifugal | ! pressure will force 
out through the skimmed | milk outlets the milk 
Fig. 22. 
Section of separator bowl of plain 
or “Hollow Bowl” type. 
