280 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1903. 
[BULL.  225. 
capacities  of  the  Nebraska  lignite  and  of  cannel  coal.     These  several 
results  are  indicated  in  the  following  tables: 
Proximate  analyses  of  air-dried  lignites  from  Dakota  County,  Nebr. 
Sample  and  locality. 
1.  Drillings,  sec.  22,  T.  29  N.,  K.  7  E. 
2.  Drillings,  sec.  22,  T.  29  N.,  R.  7  E. 
3.  Lumps  from  shaft,  sec.  22,  T.  29 
N.,  K.  7E 
Moisture. 
4.  Lumps  from  shaft,  sec.  22,  T.  29 
N.,  R.  7E 
5.  Lumps  from  outcrop,  sec.  20,  T.  27 
N.,  R.  9E 
6.  Lumps  from  shaft,  sec.  28,  T.  27 
N.,  R.  9E 
Per  c(iit. 
4.99 
4.03 
6.85 
6.47 
17.85 
6.77 
Volatile 
combust- 
ible matter. 
Per  cent. 
41.63 
51.  40 
31.05 
&27.  24 
44.27 
54. 16 
Fixed 
carbon. 
P<  /■  c<  nt. 
27.14 
33.  66 
45.  08 
49.27 
26.00 
28.66 
Ash. 
Per  cent. 
25.72 
10.91 
16.15 
16.  23 
10.  91 
8.  65 
Sulphur. 
Per  cent. 
1.20 
.86 
.86 
1.14 
1.75 
«  Sulphur  not  determined. 
&  Heated  only  to  low,  red  heat. 
Ultimate  analyses  of  air-dried  lignites  from  Dakota  County,  Nebr. 
Sample  and  Ideality. 
Moist- 
ure. 
Carbon. 
Hydro- 
gen. 
Nitro- 
gen. 
Sulphur. 
Oxygen. 
Ash. 
1.  Lumps  from  shaft,  sec.  22, 
T.29N.,R.7E 
2.  Lumps  from  shaft,  sec.  22, 
T.29N.,R.7E 
Per  cent. 
6.47 
6.  50 
l'i  r  C<  ///. 
58.  90 
60.  54 
Per  <■(  nt. 
2.70 
2.64 
Per  cent. 
1.48 
1.26 
Per  cent. 
0.86 
1.08 
Per  cent. 
10.41 
13.  98 
Percent. 
19.18 
14.  00 
Calorific  power   of  air-dried   lignites  from   Dakota   County,   Nebr.,  based  on  elementary 
percentages. 
Sample  and  locality. 
Calorics  per 
kilogram. 
B.T.U. 
per  ton. 
1.  Lumps  from  shaft  sec.  22,  T.  29  N.,  R.  7  E.   (Second  table,  1) . . 
2.  Lumps  from  shaft  sec.  22,  T.  29  N.,  R.  7  E.    (Second  table,  2) . . 
5,  297 
5,  260 
9,  534 
9,  468 
Gas-prod  a  ring  capacity  of  air-dried  lignite  from  Dakota  County,  Nebr. 
Sample  and  locality. 
Gas  yielded 
per  ton. 
Coke. 
1.  Lumps  from  shaft,  sec.  22,  T.  29  N.,  R   7  E 
( 'nhirfcet. 
<>■  12,  279 
Per  cent. 
71.2 
Average  of  ten  tests. 
