THE LOWER COAL MEASURES. 951 
The composition of the coal is indicated in the following analysis: 
Sherrodsvillercoaleees essence ee sce eee cotee scot ennosese BEA RURL Ss, Wakes y canes Lord. 
TN GSTST RR) es a it ag A 4,20 
\W/COLEKAT SY TATIEN Fed Ooo cecnes becioace boned BBC COACO CBAC BOCUONA Sada CnHDE ceOOC EER eOOnEArE 39.32 
EX OOM CAT DOME ese Teas oat ce rae ean eet w a cla whsee eee eed besueee 52.58 
VATS nee eee. RR hr MONA Mc waderen, S ROE RSE Un Er cin en UUM ois dla cays cdaieieee « . 8.90 
Y POH Mane aS NAR DCEO RE CHO SABERN TERE N ECAC OHOCCHOE CEE UCEENnE EE FArEG 100.00 
SHIUOY OEE? 600660660000066000000000000 990008 690000509000:000000000000009G0G000000000500 1.92 
These results show an excellent coal, as far as chemical composition 
is concerned. 
In physical characters the coal agrees fully with the seam, as 
already described. It is a bright, clean, well-faced coal. The arrange- 
ment of the joints, as shown on page 144, causes it to mine in oblong 
blocks, the greatest length of which is generally about 2 feet, this fact 
being determined by the intersection of the end-joints or cutters, and 
the thickness of which varies from 8 to 10 inches. This structure is a 
marked characteristic of the seam. The coal is long grained, in one 
sense of this term. 
The coal is soft or tender, wa makes a large amount of nut and 
slack in the processes of mining and transportation. Three grades are 
made and sold, viz., lump, nut and mixed. The nut coal includes all 
that passes through a screen, 14 inches between the bars, 9 to 11 feet in 
length, and set at an angle of 28°. The mixed coal is what passes over 
a screen with a mesh of inch. When this grade has paid the expenses 
of handling, it has done about all that is expected of it. 
At Sherrodsville a little less than two-thirds of what is sent out in 
the bank cars (65 per cent.) is lump coal. The balance is thus divided, 
viz., 13 per cent. nut, and 22 per cent. mixed. The Dell Roy figures 
vary a little from this, this coal being a trifle harder, and only 28 per 
cent. going through the first screen. 
When the mixed coal is washed, it loses 5 per cent., and yields a 
good quality of pea coal. Experiments have been made in coking the 
washed product, which give good promise. 
The normal roof of the seam consists of 2 feet of “ sonresianne, ” or 
soft blue shale, over which a foot of dark slate occurs, and above this 
the Mahoning sandstone, generally in massive proportions, is found. 
This makes a troublesome, but scarcely a dangerous roof. In working 
