The  pattern  need  not  be  very  true  nor  neatly  finished  for  tliin
work,  and  cast  iron  always  outlasts  wrought  iron.  But  gen-
erally a  grate  may  be  had  from  the  stove  dealers  and  tlie
brick  work  accommodated  to  the  grate.  A  wood  ])att(Tn
allows  you  to  renew  the  grate  whenever  bunied  out.  ('on-
tinue  building  up  the  brick,  filling  up  the  intersticHfH  with
smaller  pieces,  and  perhaps  mortar  or  cement,  until  A  A  A  in
reached;  at  P  place  a  brick  projection,  for  a  muftile  to  nrni
upon  as  described  under  iron,  silver,  and  gold  assays,  having
previously  had  an  opening  at  the  front,  lx>th  in  the  shwft-iron
ca^^e  and  the  brick  lining.  The  muffle  should  1m*  iKiught
before,  and  the  hole  and  .shelf  brick  projection  f\iU^\  to  the
muffle.  Proceed  in  raiidng  the  lining  inside  the  eijr\'e,  hjav-
ing  a  neat  hole  for  the  pipe  />,  and  d<x;r  B,  At  the  d/x>r  t^;p
lav  a  flat  bar  from  one  side  to  another  in  order  tlmt  the
bricks  may  be  laid  over  the  oiiening,  and  thus  fiiiii^h  till  the
lower  edge  of  the  flange  L«  rf^ehed.  LM  all  stand  for  a  day
and  then  kindle  a  small  firfr  with  ehiij^  and  hd  the  *!t//ve
.<lowlv  heat  until  all  is  drv.  T]t*r  eiriver  fC  K  E  i*h</tjld  Ur  laid
im  so  that  it  can  eAsilv  be  remov^L  and  wh^ri  n^A  wt  a  fur-
naee  for  cnuribles,  h  c^n  Ije  takeij  off  *ffiUr*:h  wh^ftt  'ImwUtu,
out  the  cmeibLEse.  An  imijorlant  mjntUfr  i^  th^r  ^Irnfi  th^rre
.should  he  a  good  dndL  aijd  a  phi^f  ^/f  bri'-k  i}XU-¥l  h\  A  Uf
close  the  fluyre  up  vb«fi  xhh  jsj^itfi*:  ik  i^A  u^sf-^i.  a^/j  y^U^fij
used  the  omffle  ihaaid  i^  pu:  ::.  ^jsAy  irh*^j  \h^  j'jr*:  >  *ti»fi>3'j
and  the  txml  ferel  vilL  iLe  sju^slSf:  ij^AVjsjj.  xij^i  'A\m^  '//hI
4


50  MINERALS,  MINES,  AND   MINING.
