522 GEOLOGY OF OHIO. 
ments in such furnaces, the new Central furnace of the Cleveland Roll 
ing Mill Co. may be described. 
This is one of the newest furnaces built in the State, and through’ 
the kindness of Messrs. Witherow & Gordon, of Pittsburgh, a drawing 
of the furnace has been furnished to the Survey; Fig. III shows this. 
furnace. The following description of the details is also furnished by 
the engineer: ‘‘ The furnace proper is 20 feet diameter of bosh, and 
75 feet high ; crucible, 10 feet diameter ; and stack line, 16 feet diameter. 
The tuyeres are 8 in number, 7 inches diameter, placed 6 feet above the 
hearth level, made of phosphor-bronze, and project inside the crucible 
12 inches. These tuyeres are secured in cast iron water-breasts of cir- 
cular form, built in the brick-work, each one being coursed with a coil 
of 1 to 14-inch gas pipe. To these tuyeres are attached swing blow- 
pipes, constructed in such manner that the least amount of time is con- 
sumed in removing a tuyere, viz., the pipe is made in two sections, and 
is swung on trunnions, so that in no case need the pipe be taken down, 
but merely by loosening the keys and lifting the pire on its trunnions, 
and clearing the space directly in front of the tuyeres ready for removing 
the same. ‘These tuyeres are riveted to the cast-iron bustle pipe circling | 
around the outside of the eight columns, which is 48 inches in diameter, 
lined with fire-brick to a clear opening of 24 inches. ‘The columns are 
eight in number, of wrought-iron, and octagonal in shape, being 
‘Phoenix’s patent. ‘They are 25 feet high, 14 inches inside diameter, 
and ? inch thick, and support the mantle plate of the furnace, which 
is composed of three 15-inch rolled I-beams, circling entirely around 
the furnace. These columns rest on heavy cast-iron foundation plates. 
The bosh brick-work is protected with a series of cast-iron rings built 
in at intervals of 36 inches. Each ring is made in 16 segments, and 
each segment is coursed with 14-inch gas pipe. It has been found by 
practical results that these plates have effectually preserved the bosh 
for four years, at the end of which time the furnace was blown out, and 
the wall and plates were found to be in perfect condition, proving their 
efficiency. It will be observed that the bosh of this furnace is unusually 
high, and five of these rings have been inserted. They furthermore 
act in the capacity of binders. The entire crucible is surrounded with 
cast-iron plates, coursed with water, and attached to the dam-plate in 
front. | } 
“The bell of this furnace is 11 feet in diameter, and is operated with 
