For  the  eold  bath  mix :


m  hydiogoD  anlphlto  ,


Coppgrin^  Bath  for  Wraitg^  and
Oaat-iron  or  SUel  Artiela.  Melt  in  a
crucible  I  part  of  dry  chtorid?  of  cop-
per and  5  or  fl  parts  of  cryolite,  com-
bined vitli  clilonde  of  barium  to  tnalce
it  more  hisible.  This  mixture  will
give  a  permanent  coatingof  any  desired
thiclineBB  to  tlie  articles,  acnjording  to
duration  of  their  ininietaion.
Simple  Fire-plating  fnr  Iron.  A  me-
tallic surface  washed  with  qodinin  anial-
^m  will  Calce  tip  a  concentrated  nnlution
of  gold  poured  upon  it,  and  afler  driv-
ing off  the  mercury  by  the  heat  of  a
lamp  will  present  a  gilded  gurface
capable  of  being  polished,  and  will  also
show  any  design  drawn  upon  the  first


The  separate  layers  of  the

jjasled  together  wi^  a  paste  of  starch,
glue,  glycerine,  turpentine^  ami  water.
The  matrix,  while  still  moist,  is  taken
fW>m  the  types,  and  d  ried  in  a  wire  frame

The  wire  frame  6  (Fi^.  11)  is  ptac«d
in  the  muffle  c,  which  is  urovided  on


the  top  with  holes  d  for  the  escape  of
the  moisture,  and  hented  by  tlie  furnace
Knxee  cfinvoved  to  it  through  the  fine  g.
lu  the  Diulne  is  another  heating  pipe


mx  provided  with  apenlnss   t}irough

which  the  air  heated  in  the  flue  g  is
conveyed  into  the  interior  of  the  muSle.
Composition  for  Moufdtfvr  Ga.lvano-
plastic  Deposiii.  Melt  t*^ther  6parts
of  white  wai,  3  of  asphaltum,  aofstea-
rine,  and  1  of  lanl,  and  add  suOicient
lampblack  tfl  color  the  massdeep  hlaek.
