186 Milk and Its Products 
was hollow, and 
the separation 
was caused di- 
rectly by the 
centrifugal pres- 
sure acting upon 
the milk in a 
mass. In the 
later machines, 
various contri- 
vances have 
been introduced 
in the bowl to 
Liniay 
LZ 
MA] 
LLOPLITILLLY 
We 
<— 
SSS SSS 
Fig. 24. Section of 
separator bowl of 
“travel” type. 
aid in the completeness 
of the separation or to 
increase the capacity. 
These contrivances have 
been of two general types: 
one to break up the wall 
of milk, and so give the 
particles of milk and 
cream a better chance to 
pass by one another in 
_their passage from the 
center to the outside of 
the bowl; the other, a 
series of interruptions to 
Fig. 25. The Sim- 
plex separator. 
