314  Cafeine  from  C of  ee  Soot  {^"' ■^°Ma/^9'20 
The  water  jacket  is  required  to  be  operated  only  in  the  summer, 
and  may  not  be  necessary  at  all  in  connection  with  smaller  roasters. 
The  glass  windows  with  incandescent  lamps  before  them,  in  the 
sides  of  the  collector,  are  required  during  the  installation  of  the 
collector  when  the  best  conditions  for  operation  are  being  estab- 
lished. 
The  door  of  the  collector  is  attached  very  loosely  so  as  to  allow 
a  final  tight  adjustment  by  means  of  the  four  screw  clamps.  A  soot- 
tight  joint  is  obtained  by  means  of  an  asbestos  or  composition 
gasket  fixed  in  a  slot  around  the  inner  edge  of  the  door. 
The  interior  of  the  collector  is  painted  with  aluminum  paint, 
to  prevent  rust  from  forming  and  becoming  mixed  with  the  soot. 
The  collected  soot  is  removed  by  releasing  the  screw  clamps, 
throwing  back  the  door  on  its  hinges  and  scraping  out  the  soot  with 
a  long  steel  or  wooden  blade. 
Only  the  soot,  and  not  the  chaff,  possesses  any  degree  of  com- 
mercial value,  therefore  the  collector  will  probably  not  be  applicable 
to  the  collection  of  soot  from  the  type  of  roaster  in  the  flue  of  which 
a  strong  blower  must  be  employed,  for  the  reason  that  the  chaff 
and  soot  are  usually  inseparably  mixed  by  the  blower.  The  collector 
can  be  applied  to  the  collection  of  soot  from  a  roaster  equipped  with  a 
blower  by  reducing  the  speed  of  the  blower,  so  that  none  of  the  chaff 
is  blown  up  into  the  collector,  the  speed  of  the  blower  being  only 
enough  to  prevent  the  escape  of  soot  and  flue  gases  into  the  room 
in  which  the  roaster  is  situated.  If  the  purpose  of  the  blower  is  the 
removal  of  the  chaff,  reduction  of  its  speed  to  collect  the  soot  will 
nullify  this  purpose  and  add  an  operation  to  the  roasting  process, 
namely  the  removal  of  the  chaff.  This  will  increase  the  expense  of 
coffee-roasting  process,  and  should  be  debited  against  the  returns 
to  be  expected  from  the  collection  of  the  soot. 
FOR  EITHE^R  GAS  OR  COAL  ROASTEjRS. 
The  collector  is  applicable  to  the  collection  of  coffee  soot  from 
either  gas-fired  or  coal-fired  roasters,  but  it  must  be  remembered 
that  coal  soot  or  gas  soot  have  no  value,  and  therefore  efforts  must 
not  be  directed  toward  the  production  of  these  types  of  soot. 
No  dimensions  are  indicated  in  the  drawing  of  the  collector, 
>  as  any  size  can  be  used  according  to  requirements;  merely  keeping 
the  dimensions  in  approximately  the  same  ratio  as  they  appear 
