324  COJSTKIBUTIONS    TO    ECONOMIC    GEOLOGY,   1903. 
Comparative  analyses  of  coke. 
[BULL.  225 
Fixed  carbon 
Voltatile  hydrocarbons 
Moisture 
Ash 
Sulphur 
Elders 
Ridge. 
Per  cent. 
90.  532 
7.411 
2.057 
100.  000 
Connells- 
ville. 
Per  cent. 
89. 509 
.880 
.070 
8.  830 
.711 
100.  000 
Two  analyses  of  coke  made  from  Pittsburg  coal  are  given  above. 
The  first  was  made  by  A.  S.  McCreath  from  coke  made  in  the  labora- 
tory of  the  second  geological  survey  of  Pennsylvania  by  coking  coal  in 
a  platinum  crucible.  The  coal  was  from  the  Saltsburg  Coal  Company 
mine  in  the  southern  block  of  the  Elders  Ridge  field.  The  second  is 
the  average  of  a  number  of  analyses  of  typical  Connellsville  coke  made 
by  the  H.  C.  Frick  Coke  Compan}^.  The  amount  of  sulphur  in  the 
Elders  Ridge  coke  is  too  high  for  a  first-class  product,  but  this  might 
be  remedied  by  washing  the  coal  to  get  rid  of  part  of  the  sulphur. 
