506. GEOLOGY OF OHIO. 
CHARCOAL FURNACES— DIMENSIONS. 
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Pine Grove.....| 33 10 6| 6 3 By il 8 | ? 3. 6 
Jefferson ........ 38 YH Oi fb ©& 33 32 | 11 3 2 26 
Hamden......... 32 10 6 34. BO) | Lie Ge on eSaleS 39 
Monroe .......... 40 ll 4] 6 32 34 | 12 » O)]8 2B 40 
Heclainec nce. a GO 4 323| 2 6] 11 4 3 4/4 
Howard ..... ... 36 12 6|] 6 6 32 32 | 11 5 32 44. 
WWIANGIN sasvec0d000 32 6 2 10 9 4 34 30 
Keystone........ 34 11 38 10|;3 4 
Ohio eee ose 32 11 6 11 % B18 © 
Washington ...| 38 6 32 11 2 8 24 
The arrangement of these furnaces is on the plan of the one previ- 
ously figured. The lines, it will be noticed, show a remarkably flat 
bosh. This is more noticeable in older furnaces; in relining them, it 
has been usually the plan to make a sharper angle, and some of the 
most experienced men of the district state that the advantage of such 
a change is decided. In the table of capacities is given also the pro- 
duction of the furnaces, by which it will be seen that the average capa- 
city of the charcoal furnaces using hot-blast is about seventy-five cubic 
feet per ton of iron made in 24 hours. The two cold-blast furnaces, 
Hecla and Jefferson, show such difference that no average can be drawn, 
but when with these figures for capacity the fuel consumption be taken, 
the relation between a proper volume and the yield is seen. Jefferson 
furnace makes a ton of iron with 171 bushels of charcoal, while Hecla 
requires 221 bushels to do the same work. 
The capacity of some foreign and other furnaces is here given for 
sake of comparison. | 
These figures are from recent publications, and represent present 
facts. It is to be regretted that so few figures relative to American 
furnace practice are published in sufficiently detailed statements to be 
reliable for exact calculation. The idea that such matters are secrets, 
which should be kept from the public, is, however, getting to be a thing 
of the past. These charcoal furnaces are generally provided with from 
