18 
CHEMICAL  AND  PHARMACEUTICAL  MANIPULATIONS. 
best  analytical  chemists  in  the  world  have  been  self-taught,  and 
we  do  not  doubt  that  a  young  man  can  accomplish  himself  in  the 
shops  of  our  best  pharmaceutists  at  home,  as  a  competent  and 
skilful  analyst. 
Our  space  will  not  permit  us  to  say  more,  We  subjoin  some 
of  the  new  matter  in  this  edition  which  appears  to  us  valuable 
and  interesting  : — 
Deville's  Blast  Lamp. — This  implement,  the  invention  of  St.  Clair  Deville, 
is  designed  for  producing  high  temperatures  with  the  use  of  alcohol,  wood 
spirit,  kerosene,  camphene,  and  similar  fluids,  as  fuel.  Those  hydro-car- 
burets which  have  the  lowest  boiling-point  and  give  the  densest  vapors, 
afford  the  greatest  heat.  The  lamp  is  applicable  for  fusions,  fluxing,  and 
ignitions,  and  a  few  seconds  only  are  necessary  to  raise  the  heat  equal  to 
that  of  melting  iron. 
Fig.  161  is  a  drawing  of  the  apparatus.  "  It  consists  of  a  reservoir  f,  with 
three  tubulures  above,  t  t  i'.  By  means  of  the 
blast  of  a  blow-pipe  table,  the  air  is  injected  into 
f  through  the  tube  v;  which  is  inserted  in  t.  The 
tubulure  t  carries  the  vertical  tube  o,  which  has  a 
stop-cock  at  r,  and  divides  above  into  two  arms 
b  br,  which  pass  into  a  metallic  box  tj,  and  ter- 
minate in  its  upper  part  with  open  extremities 
cut  off  obliquely.  The  box  u  contains  the  burn- 
ing fluid  e  partly  filling  it ;  and  it  connects  with 
a  reservoir  by  t",  which  is  kept  at  a  constant 
level.  The  centre  of  this  box  is  a  cylindrical 
tube,  closed  below,  through  which  passes  the 
blow-pipe  e,  a  continuation  of  the  tube  t',  the  left 
tubulure  (in  the  figure)  of  the  flask  f.  The  tube 
which  is  at  the  middle  of  box  u,  and  envelopes 
the  blow- pipe  c,  has  several  small  holes  u  u  com- 
municating with  the  empty  (or  upper)  part  of 
Fig.  161. 
the  box  u. 
"  Above  the  blowpipe 
there  is  a  copper  cup  k, 
and  resting  in  a  furrow  in  the  top  of  the  box  u, 
ierced  at  the  centre  with  a  hole  for  the  passage  of 
the  jet  of  vapor  which  escapes  from  the  holes  u  u  u,  after  the  bellows  are 
put  in  action. 
«  To  prevent  the  burning  fluid  from  becoming  too  much  heated  there  is  a 
trough  s  containing  water.  Before  lighting  the  lamp,  the  fluid  in  l  is 
heated  till  the  water  in  the  trough  boils  ;  then  the  bellows  are  made  to  act, 
and  the  jet  of  vapor  is  lighted ;  after  which  the  heat  disengaged  by  the 
lamp  is  sufficient  to  continue  the  vaporization  of  the  fluid. 
«  Above  the  box  l  there  is  a  chimney  a  having  a  series  of  holes  around 
bottom  for  drawing  in  air  on  the  flame  of  the  apparatus." 
near  i 
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