ROASTING—

is  an  operation  preliminary  to  various  processes,  in
order  to  get  rid  of  sulphur,  arsenic,  zinc,  or  other
interfering  elements ;  and  sometimes  to  change  the
base  metals  and  silver  into  soluble  chlorides  or  sul-
phates. The  operation  is  performed  usually  in  re-
volving iron  cylinders,  reverberatory,  or  other  forms
of  furnaces,  with  heat.  Crude  roasting. is  sometimes
done  in  heaps  with  wood,  or  the  sulphur  of  pyrites,
if  in  sufficient  quantity," is  utilized  sometimes  as  a
fuel.  Sulphurets  by  long  exposure  to  the  weather
naturally  roast  or  oxidize  slowly.
THE  DENVER  FIRE  CLAY  CO.
Manufacturers  of  CRUCIBLES,

SCORIFIERS,
MUFFLES,
ASSAY  FURNACES,
BRICK,  TILE,

And  everything  made  of  Fire  Clay  for  Metallurgical  pur-
poses. Also

Strictly  C.   P.  Granulated  and  Sheet  Lead,
Bone  Ash,  Borax  Glass  and  Iron  Sulphide

All  Assay  Supply  Dealers

Handle  Our  Goods  Denver,  Colorado,  U.  S.  A.
A.  Q.  GODFREY,

Manufacturer  of

DRV      WASHEIRS


I  manufacture  bellows  as  well  as  fan  machines.      If

I  have  not  got  what  you  want,  will

make  to  your  order

206  5.  Los  Angeles  St.,        •=         Los  Angeles  Cal.
5CALE  REMOVED  BY

"ACHE"


BOILER  COHPOUND


Prevents  foam,  grease  and  dirt
Saves  time,  fuel  and  labor
Water  analyzed  free  of  charge

MANUFACTURED   BY

BAIL-EIY    &    \ASARREIM,

300-302  5.  Los  Angeles  Street,        =  Los  Angeles,  Cal.
Only  Exclusively  Engineers'  Supply  Houses  in  Southern
California.
TO  Mining  and  Oil  Men :

R.  W.  Landrum  offers  his  services  as  Min-
ing and  Consulting  Engineer.  In  addition  to
his  technical  knowledge  he  has  had  practical
experience  extending  over  a  period  of  nearly
fifteen  years,  and  his  best  references  are  those
for  whom  he  has  rendered  service.
OFFICE,

McMannon,   Landrum  &  Co.,

Room  204  Currier  Block, I^os  Angeles,  Cal.
N.  B. — Refer  to  Messrs.  WADE  &  WADE,  as  well  as  my
numerous  customers.
