190  Miscellaneous  Implements  Exhibited  at  Park  Royal. 
is  necessary  to  have  a certain  distance  between  the  plates  as 
two  opposite  currents  meet  between  each,  viz.,  tlie  whole  milk 
passing'  from  the  centre  to  the  outside,  and  the  cream  from 
the  outside  to  the  centre.  The  inventors  of  the  pump  separator 
have  chosen  another  system  of  interior  of  bowl,  in  dividing 
u[)  the  bowl  by  a great  number  of  vertical,  parabolic  blades 
(Figs.  (),  7,  and  8).  In  this  arrangement  the  whole  milk  enters 
at  the  bottom  and  gets  separated  on  its  wav  to  the  toj),  that  is. 
