198 GEOLOGY OF OHIO. 
washed and sifted and divided by an ingenious method, adapted by the 
Superintendent, Hugh Laughlin, goes out for rolling-mill use, and for 
stationary engines. It makes a cheap fuel, but a considerable part of 
the impurities of the coal gravitates to it. 
For domestic uses this coal cannot compete successfully in the 
markets of Eastern and Northern Ohio with the excellent seams that 
are there counted the standard fuels, but for steam purposes it rates 
deservedly high. The subjoined analysis shows it to be a strong 
heating coal, not excessive in ash, but rather high in sulphur. Its 
physical rather than its chemical qualities rule it out of competition for 
household fuel. 
ANALYSIS OF CoAL FROM Strate Ling Ming. (Lord.) 
Moisture. ... ...... Bese sin itin sin Tortinbes sees ples vlesieisig sis’ weeweee Se UEe Nacmenmr Ion neeeen teenie 2.10 
Volatile matter ches. -stecccscecees--s sess ccc neces eeeee. ‘eoeantadidnmas soem obedememnucene 39.37 
Fixed) Carboni i. ..csceseseeemerteee (eet eee aes ee ee aeeee See Tae ae eee eC ane ate manne aes 53.46 
ABD iccceccdececte cbs diceeae memloenean miteee tts te Ome oes sles Sao aeae ee cara eine tee Manner eh 5.07 
TOtal b v.cide eeeeesc ce otsk cre ccsecsucecenessceeteectece te sececsoecermeceteiy ate 100. 
Sulph ups... sch ceacetedecseet ese csccselvcselbuses ts core ovacsece tee enses eee dae ence amr noes BR) 
This result is entirely in keeping with the other analyses of this 
seam in this portion of the State. . 
The mine is level free, and was one of the first in the State to 
introduce an endless chain for drawing out the bank-cars. The cable 
now runs in 14 miles from the mouth, and some entries are worked 
fully 13 miles beyond the termination of the cable. Mule power would 
be entirely inadequate to the present output under present conditions. 
The seam yields a little less than 2,500 tons of clean coal to the acre, 
and somewhat more than an acre is worked out every week. 
The cover of the coal is a black slate 2 or 3 feet in thickness, over 
which a moderate development of the Mahoning sandstone is generally 
found. ‘The protecting slate is sometimes cut away, to the detriment of 
the coal whenever it happens. 
The Upper Freeport limestone constantly accompanies the coal, 
being separated from it by about 2 feet of fire-clay. The limestone is 
