Agricultural  Knyines. 
199 
steam  to  1 lb.  of  coke,  and  8 lb.  of  steam  per  square  foot  of 
heating  surface  ; working  ])ressure  200  lb.  ; water  capacity 
460  lb.  ; tested  to  400  lb.”  Price  65/. — Amongst  vertical 
A,  Palent  Feed  water  heater  and  filler,  delivering  water  to  boiler  free  from  sediment  and  at  an 
approximate  tempcraiure  of  250  to  300  degrees,  n.  Steam  Rryer  receiving  heat  of  Are  after  leaving 
tubes,  c,  Stop  Valve,  n.  Hinged  ash  pit  door.  E,  Bolted  joints  for  removing  outer  shell,  f,  Central 
Feeder,  fi.  Cold  water  from  pump,  ii,  Live  steam  to  feed  water  heater.  I,  Condensed  water  back  to 
boiler.  J,  Hot  feed  water  pipe.  K,  Perforated  feed  pipe  spra.ving  the  water  into  boiler  equally  all 
round,  l.  Cleaning  doors  3 at  120  degrees.  M,  Clinker  door,  x,  Chimney  with  outer  casing  and  air  S|iace 
Fig.  11. — Vertical  Fire  Tube  Boiler  (Article  816). 
boilers  for  motor  waggon  use  this  boiler  shows  in  a very 
marked  degree  those  elements  of  design  which  mean  success 
in  practical  working.  There  appears  to  be  a total  absence 
of  all  possibility  of  stress,  and  therefore  of  probability  of 
