Pump  Separator. 
191 
the  separated  milk  goes  upwards  and  outwards,  the  cream  goes 
upwards  and  inwards.  On  this  account,  so  say  the  makers,  it  is 
possible  to  have  a much  greater  number  of  partitions,  and  thus 
get  the  milk  divided  up  into  thinner  sheets.  The  milk  in  the 
bowl  of  the  pump  separator  is  divided  up  into  seventy  layers 
of  about  in.  thickness.  This  arrangement  of  the  bowl 
gives  the  pump  separator  a much  greater  capacity  than  other 
sej)arators  of  the  same  size.  For  instance,  the  weight  of  the 
})ump  sej)arator  for  skimming  tit!  gallons  an  hour  is  40  lb. 
(without  pillar),  and  the  size  of  bowl  is  oidy  in.  diameter, 
and  in.  in  height. 
In  spite  of  the  great  number  of  plates  the  bowd  can  be 
easily  cleaned  and  assembled.  The  seventy  blades  in  the  bowl 
are  all  threaded  on  a ring  at  their  upper  inner  corner,  like 
keys  on  a key  ring.  Each  single  blade  is  entirely  free  from 
its  neighbours,  and  the  whole  lot  of  blades  is  quickly  and 
conveniently  cleaned  simply  by  being  shaken  in  hot  water 
Fig.  6.— Parts  of  Pump  Separator  (Article  3092). 
(Fig.  8).  The  assembling  ring  is  parted  (like  a key  ring), 
enabling  any  blade  to  be  removed  and  another  substituted 
in  case  of  damage.  The  blades  are  all  alike  and  can  be 
inserted  anywhere  ; they  centre  themselves  automatically,  and 
the  bowl  is  absolutely  self-balancing.  This  is  by  no  means 
the  least  advantage  of  this  system  of  construction. 
A new  idea  is  the  combination  of  the  pump  separator  with 
an  automatic  feeding  device  for  the  milk.  A very  simple 
pump  is  driven  direct  from  the  handle  motion,  feeding  the 
separator  automatically  from  a vessel  of  any  size,  placed  on 
the  floor  close  to  the  machine.  The  stroke  of  the  pump,  and 
therefore  the  ratio  of  feed  to  revolutions  of  bowl  in  order 
to  separate  the  stipulated  quantity  of  milk  at  the  stijiulated 
speed,  is  adjusted  and  marked  at  the  factory.  Variations 
in  speed  are  therefore  of  little  importance,  as  the  feed  of 
milk  and  the  speed  of  bowl  always  keep  proportional. 
