IRON MANUFACTURE. 497 
Block ore, Vinton county.—Chemist, Lord. 
Blue ore, Athens county.—Chemist, Lord. 
Ore, Pine Grove Furnace.—Chemist, H. Weber. 
Ore, Pine Grove Furnace; Newcastle Red Block.—Chemist, H. Weber. 
Blue Block ore.—Chemist, H. Weber. 
Se SS) 
Besides the works in the districts above described and discussed in 
detail, there are a few unimportant ones scattered over the State, which 
belong to no district especially. These are the Manhattan Furnace at 
Tronville, Toledo, Lucas county, and the Maumee and Paulding Fur- 
naces in Paulding county. They use Lake Superior ores and charcoal. 
The estimated capacity is about.15,000 tons annually. They represent 
the southern limit of the charcoal iron industry of Steins, where 
Lake ores are reduced by charcoal. 
This completes a review of the geographical distribution of the 
iron works of Ohio, together with a discussion of the characteristics as 
to ores and fuel of each district. To avoid repetition the separate works 
and modes of smelting were not treated of, it being thought more desir- 
able to make of the metallurgy of iron in the State a separate section, 
complete in itself. With this object in view, as many facts relative to the 
forms of furnaces, treatment of ore, equipment in engines, stoves, etc., 
with figures relative to the proportions of ores, fluxes, etc., and the 
burden of ore to fuel, with analyses of products, as the limited time and 
means at the disposal of the Survey would permit, have been collected. 
Through the courtesy and kindness of many of the furnace companies, 
access was given to their furnace-books and drawings of furnace lines 
furnished, which have been of great assistance in preparing this part of 
the work. 
The treatment of fuel, converting it into coke, forms the subject 
of a separate chapter. 
THE METALLURGY OF IRON IN OHIO. 
The preparation of the ore in this State consists in most cases of 
merely a preliminary roasting more or less complete. The preparation 
of the ore by washing, used in other parts of the world, has not been 
introduced here. The desirability of special attention to this branch 
of preparation has been apparent in many parts of the country, where ' 
32 G. 
