—6§84 GEOLOGY OF OHIO. 
opening just above these flues, and is thoroughly mixed with the air in 
the first chamber, securing perfect combustion, thence passing up and 
down again through the first group of flues, thence up again and down 
to the chimney valve and flue. It is our object to have a thorough com- 
bustion of the gases in the first chamber, thereby utilizing the balance 
of the stove as a reservoir for heat. Ata recent test made at the Isa- 
bella furnces, one of these stoves was kept on blast eight hours, giving 
an average temperature during this time of 1300 degrees Fahrenheit. 
The bricks used in these stoves are of a porous nature, so that heat com- 
ing in contact with them is readily absorbed.” 
This form of stove is figured in the transactions of the American 
Society Mining Engineers, vol. 9, p. 494, together with the older pat- 
tern of the same stove. ‘These fire-brick stoves are in use in several 
places in Ohio, with generally good results. 
While a full description of all the works in the State will not be 
attempted, short notice of some of the principal ones will be given, that 
the extent and character of the establishment, may appear, and any de- 
partures from the general statement given, be noticed. 
The works at Cleveland comprise the furnaces of the Cleveland 
Rolling Mill Co., and the “ Emma” furnace of the Newburg Furnace 
Co. This latter furnace has been recently overhauled, equipped with 
new hot-blast Pollock stoves, new boilers and a blast engine; the fur- 
nace, 66 ft. by 16 ft., is expected to make a hundred tons of iron per 
day ; the furnace has 7 tuyeres, and is 8 feet in the hearth ; it is run on 
take Superior ore and Brier Hill coal with Connellsville coke. The 
Cleveland furnaces use as a flux the Kelly Island limestone, of which 
the following analyis was kindly furnished by the Cleveland Rolling 
Mill Company : 
Carbonatelob climes: 2253s. . Reais ire oce aclote oes ae ode seitam sent elicnaesens 87.50 
SUT Cais ‘accchcsaasestaeaysaeeteteoeees cscs cee oe ec eceieeee wach tes Seeker eee 1.81 
Adamina (and iron. csic.vevecec cee sgueencwecs ceases oeecemelen suewiseens Mone erm 0.75 
Carbonate of magnesia, csic..cocsscdecsess ccreseooesscinevets ances ncecceccmectes 9.75 
PHOSPHGLUS) s.4eseskoewes cesses totale conor tecloeesretecereccuu cee screwecouuenaee comes 0.019 
(Magnesia by difference.) 
The throat of the furnace is about 9 feet in diameter, but is consid- 
ered too small, and it is proposed to ealarge it to a 12-foot throat in the 
future. The furnaces of the Cleveland Rolling Mill Co. are situated as 
follows: Two stacks at their mill at Newburg, one of the stacks only 
