633 
Report  on  Implements  at  York. 
hollow  shaft  on  which  the  cylinder  revolves.  The  hollow  shaft 
supplies  steam  (or  water)  to  numerous  serpentine  coils  of  pipes 
covered  bv  plates  (having  about  120  square  feet  of  surface), 
these  being  also  fixed  upon  the  shalt  and  inside  the  “conical 
cylinder,”  which  contains  the  grain  or  other  material  for  treat- 
ment, and  which,  when  turning  on  its  axis,  gives  such  complex 
motion  to  its  loose  contents  (the  force  of  gravity  and  that  of  cen- 
trifugal motion  being  brought  into  opposition  by  the  shape,  speed 
and  position  of  the  machine),  that  the  grain  gets  rubbed  at 
the  same  time  that  it  is  being  dried.  The  vessel  holds  about 
4J  quarters,  and  the  drying  is  effected  partly  by  the  heat 
developed  from  the  hollow  shaft  and  the  serpentine  coils  of 
Fig.  30. — Keighley's  Grain  Dryer  and  Purifier. 
pipes,  and  partly  by  a blast  of  hot  air  (300  to  600  cubic  feet 
per  minute),  which  is  blown  in  through  a stuffing-box  fixed 
at  the  foundation  of  the  cylinder  direct  upon  the  grain  by  a 
small  fan.  The  products  of  combustion  are  conducted  from 
the  smoke-box  by  a long  tube,  9 inches  in  diameter,  which, 
after  making  the  necessary  travel,  returns  to  the  chimney. 
Outside  this  is  a larger  tube,  about  12  inches  in  diameter,  con- 
nected with  the  fan  and  open  at  one  end,  close  by  the  chimney. 
The  air  in  its  passage  to  the  fan  becomes  heated  to  a high 
temperature,  in  which  condition  it  is  forced  into  the  cylinder. 
If  cold  air  is  required,  the  hot  air  can  be  shut  off  from  the  tube 
VOL.  XIX. — S.  S.  2 T 
