124 
With regard to their depth, a more accurate idea may be formed 
from the annexed sketch ; remarking, in this place, that the lower 
the coal, the less is the depth of the immediately incumbent strata. 
The depths of the coal strata are various, as will be seen in the fol- 
lowing table, which shews the depth of the several coal beds which 
are worked. 
Strata. 
Ft. 
In. 
Strata. 
Ft. 
In. 
No. 1 
... 1 
0 
No. 11 
... 0 
6 
2 
... 0 
18 
12 
... 2 
0 
3 
2 
0 
13 
... 1 
2 
4 
... 0 
18 
14 
... 1 
3 
5 
2 
0 
f ... 
2 
0 
6 
... 0 
9 
The great bed V 
in four floors, y 
... 1 
2 
7 
... 0 
4 
No. 13 ) - 
... 1 
4 
8 
... 1 
0 
f ••• 
... 1 
0 
9 
... 1 
0 
16 The little bed, 
... 1 
0 
10 
... 1 
9 
17 The last bed. 
... 2 
7 
The lower coal strata furnish the best and strongest substance for 
burning. The shaft, from the grass to the bottom of the last coal 
stratum, is seventy-five feet deep. It has been bored thirty-three 
feet still deeper, but nothing was discovered but a kind of muddy 
clay intermixed with sand. The disposition of the strata is dis- 
played by their method of working: they begin on the top, and 
clear away to the distance of eight or ten fathoms, and work down, 
in a perpendicular direction, through the various strata, to the bottom 
of the shaft ; then recommence their operations, &c. 
The direction of the strata is from north to south ; the inclination 
or dip tending to the latter. This inclination is computed to be 
about one foot in six ; the leading part is from east to west. Tlie 
northern part reaches to the surface, within an hundred yards of the 
shaft, where it is cut oflP by a bed of sand ; to what depth the south- 
ern extremity reaches has not been, and possibly cannot be, ascer- 
tained ; it has been found, however, to extend a quarter of a mile. 
/ 
