538 GEOLOGY OF OHIO. 
double horizontal blowing engines, 48 in. by 4 ft., and five 4-inch 
tuyeres ; it has two Pollock stoves, with 32 pipes to a stove; these pipes 
are 8 in. by 11 in. in section, and 103 to 11 ft. long; the blast pressure 
is about 4 lbs., and the temperature from 750 to 800; the average num- 
ber of strokes of blast engine, 24. The Fulton furnace, of Jackson, is 
very similar in its general equipment, built, like all the raw coal fur- 
naces in this vicinity, with iron shell or mantle, and lined as before 
described ; has four 4-inch tuyeres, and pipe-stove with 48 pipes, 12 ft. 
long. The Milton Furnace and Coal Company, at Wellston, differs 
from the other furnaces in this district by being provided with three 
Whitwell stoves; the furnace is blown with five tuyeres, 4 to 5 in. in 
diameter. ‘The new furnaces at Floodwood are also provided with fire- 
brick stoves of the Cowper-Siemens pattern, these being the only works 
using such stoves; the other furnaces in the Hocking Valley all using 
the simple Player pipe-stove. The number of men usually employed 
at these Jackson furnaces is from 25 to 30, sometimes fewer. In con- 
struction these furnaces are simpler, as a rule, thon those of the Maho- 
ning Valley, the iron mantel and cast-iron columns being the invariable 
type. ‘The other furnaces at Jackson and vicinity are the Star furnace, 
provided with horizontal blowing engines, 48 in. by 45 ft.; Thomas. 
pipe-stove of this district being practically the same as the Pollock 
stove of the Mahoning Valley; that is, having oval pipes divided by a 
central diaphragm ; in this case the furnace has two stoves, with 32 pipes 
to each stove, uses a blast pressure of 4 lbs., and a temperature of possibly 
800 degrees. The Huron furnace at Jackson has two horizontal blast 
engines, 48 in. by 5 ft, and six tuyeres, 33 to 4 in., two Pollock and 
Davis stoves, 32 pipes to the stove, 8 by 11 in. in section, and 10 to 
11 ft. long; the furnace is lined with fire-brick from Oak Hill, Ohio. 
The Eliza furnace at Wellston has a vertical blast engine, 54 in. 
by 4 ft.; five tuyeres, 33 by 4in., lined with Webster fire-brick ; has 
two stoves, with 32 pipes to the stove; these blast engines run about 
25 revolutions per minute. These raw coal furnaces produce, as is 
seen by figures already given, excessive amounts of gas, which is utilized 
in heating the boilers and stoves, but is not all needed for this purpose; 
hence, at all these furnaces a large amount of superfluous gas may be 
seen burning to waste; that some of this might be economically used 
for roasting ore or other purposes would appear probable. 
The gases produced from these coal furnaces are rich in combustible 
