546 GEOLOGY OF OHIO. 
The composition of the Jackson shaft coal (this being the coal 
used) is shown by the following analysis : 
MOEA sahil enaVGl WAMKEteoccccd ba605006060060000. 000006000000500¢0000000 060800000 41.27 
Hix edt canbomeer soccer sce ee oeeee Coleslaw Staeeieae Sacaehaententonaene 55.43 
7} 0 RRO Re ee oe ot cob 3.30 
This ash is lower than the average, and in the calculation the ash 
will be assumed at 4% per cent. 
The composition of mill cinder will be shown by the following 
analysis: 
1 2. 
SUCH kiss Sas asiileo dvs Gealdee Seed ces octane oc ooo eeamoccaseee mes uate eseescnuseancoacamecmnce ts 27.34 22.76 
7A ADAG 1 Ran eae RB cRCARCERE Ca oS TaG Herre anonan es codgHacoo catc6o : Modelo Mueesug oan: 2.18 3.10 
OXideOLMAaNGANEsE (iss. Woaccce dees. rose cecelenseeecince ete tone tome meee ana cs | Mcce men mere cee 2.38 
MINING ee cencecuseseatesisecn-ucenssecdesce veseanenoesseneanoceaisetneeserteosceseciscrescen: 0.75 2.40 
1 Ia 921) Eppa cnc reer RRB A anpee ena BOD eeecED 4o5 080806 SaccGeGD ichooacdd6 4oGonKdecoodb senor 20 0.34 
12) aKa} } 9) 0X0} Av tee amnenosee60056e005000008 bocboodcoDH00000000G0001050000 50000 H00dC OONHE 32 1.80 
Tomy tal tics ieived eodtinduscdeten aeewsoeecpencaueeneenectnecacceasiameavaees cannons: AT. 50.6 
Stl OM 2s ..cicstles sowatondelectonscccteescetemectsctenset seamesccasaceccteemeeemerees 0.65 0.19 
1. Flue cinder. 
2. Tap cinder. 
A number of iron determinations in various cinders show that these 
are lower than usual; hence, for the present calculation, an average of 
silica 23 per cent., alumina 23 per cent., and iron 51 per cent. will be 
assumed. 
It will be necessary to calculate the composition of the ore and 
its richness, from the yield; special analyses before given will serve to 
show the ratio between the elements which make up the gangue of the 
ore, but their total amount is best obtained by knowing the iron yield. 
Analysis of the iron shows it to be as follows (the sample is from 
a furnace smelting the same mixture, and will not vary appreciably) : 
