PRODUCTION  OF  VERY  HIGH  TEMPERATURES. 
447 
apparatus.  As  soon  as  the  distillation  ceases,  pour  the  oilj 
residue  into  a  capsule,  and  after  being  assured  that  the  last 
traces  of  the  sulphuret  have  disappeared,  put  the  oil  in  bottles 
for  use. 
The  recovered  solvent  is  pure  and  fit  for  use  again.  This  pro- 
cess yields  52  per  cent,  of  oil  of  equal  activity  with  that  ob- 
tained by  other  processes. 
The  oils  of  Laurel  berries  and  Nutmegs  can  be  readily  pre- 
pared in  the  same  way,  by  submitting  these  substances  to  the 
action  of  the  sulphuret,  with  subsequent  pressure,  etc.,  and  whilst 
the  resulting  oils  are  entirely  free  from  the  odor  of  the  solvent, 
they  retain  their  peculiar  volatile  oils,  so  as  to  be  highly  aro- 
matic Journ.  de  Chimie  de  Wed.,  Juillet,  1856. 
ON  THE  PRODUCTION  OF  VERY  HIGH  TEMPERATURES. 
Sainte  Claire  Deville  has  published  an  extended  description  of 
the  methods  employed  in  his  laboratory  to  produce  high  tem- 
peratures, and  his  paper  possesses  great  value  and  interest.  For 
operations  on  a  small  scale,  Deville  employs  a  lamp  of  peculiar 
construction,  in  which  the  vapor  of  oil  of  turpentine  or  any  other 
liquid  of  hydro-carbon  is  completely  burned  by  means  of  a  power- 
ful artificial  blast  of  air.  The  lamp  in  question  would  be  scarce- 
ly intelligible  without  a  figure,  and  we  must  refer  for  fuller  de- 
tails of  its  construction  to  the  original  memoir.  By  its  means  a 
heat  sufficient  to  melt  feldspar  can  be  easily  produced,  provided 
that  the  table  bellows  employed  is  of  sufficient  size  and  power. 
[We  have  found  it  in  practice  less  safe  and  convenient  than  the 
gas  blast  lamps  with  sixteen  jets,  introduced  by  Sonnenschein, 
but  gives  a  higher  temperature.  W.  G.]  The  other  apparatus  de- 
scribed by  the  author  is  a  blast  furnace,  in  which  platinum  and 
many  other  substances  can  be  fused.  It  consists  of  a  cylinder 
of  fire-clay  18  centimeters  in  diameter,  and  somewhat  higher  than 
its  width.  This  may  be  surmounted  by  a  dome,  to  prevent  the 
escape  of  the  coals  from  the  force  of  the  blast.  This  cylinder 
rests  upon  the  edge  of  a  hemispherical  cavity,  connecting  with  a 
good  forge  bellows.  A  circular  piece  of  cast  iron,  pierced  with 
openings  about  10  millimeters  in  diameter,  and  disposed  round 
the  edge  of  the  plate,  forms  the  bottom  of  the  cylinder  and  sepa- 
