514 GEOLOGY OF OHIO. 
Ore (limestone). Average. Limestone. 
Sesquioxide of iron ............ 62.30 Carbonate of lime ...........0+ 95.65 
ANOVTDVITE,, ooooaoson ne aastgets nares 7.86 Carbonate of magnesia ........ ll) 
Silicayeyeess Lauibele ites cabana ne eee 22.14 ANURTNTTE, HNC! WROD scoseocce s00000 2.70 
TGiIM Git5sseee eee ee Leg 3.09 Silicate es eons eneeee 1.20 
Manganesereee ee 0.85 
Ma onesiasiot Seeilen ce een. 0.92 
WEBER, Chemist. 
Slag. Iron—Average. 
Sit Cae A ieee ehanc eS e oh 54.68 Carboniiat orgasm 3.50 
7 ADWETD) OY esennccs oaLRASESeCRaMoaoaA 20.63 SUiConne eee ates. nee ee ee 2.00 
HINA CRs aecerminoss uceciesecsasccaaees 23.71 JEINOEFO NOLES. ccoogacdeoocansoccoocs 36 
OEAC® Gli WRON .c0c60000000000 000006 0.32 JERI, socooo0 Saeeta ace sen some etter es 94.00 
WEBER, Chemist. 
Average charges extending over six weeks, taken from charging 
books: 
Pig-iron per day, 17.5 tons of 2,000 lbs. 
Limestone per ton iron, 0.365 tons, or '730 lbs. 
Charcoal per ton iron, 1.419 tons. 
(Charcoal weighed, and including 11 per cent. “ brands.’ ) 
Ore per ton iron, 2.175 tons. 
Of the analysis above given, the limestone and slag are from the 
furnace ; that of the pig-iron represents the average composition, as 
shown by analyses published in this report. 
The analysis of the ore is one made by the present Survey of the 
same ore in a neighboring locality, and represents fairly the average. 
The blowing engine had 2 cylinders of 48x50 inches, and these 
made an average of 11 strokes per minute. The blast pressure averaged 
about 3 lbs. The temperature of blast about 800°. 
The amount of carbon in the fuel may be assumed at about 90 per 
cent., the other 10 per cent. being moisture and ash. This estimate is 
based on the mode of making and storing charcoal for use, which 
easily allows the absorption of this amount of water. 
One ton of pig-iron contains 94 per cent of iron, or 1,880 lbs. 
This is derived from the 2.175 tons of ore used, and represents a yield 
of 43 per cent. on the ore. 
The quantity of slag produced in making a ton of iron may be 
ascertained as follows: 4,350 lbs. of ore minus 2,688 lbs. of iron oxide 
(corresponding to the iron above), leaves 1,662 lbs. of slag-forming 
elements in the ore. The 730 lbs. of limestone contain 95.84 per cent. 
