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EXPLANATION OF THE PLATE. 
) Fig. 1 ig a plan of the: furnace, and od is a section 
of it taken at the line A.B.» The plan. is sen.at, the line 
CD, _ The same parts fib fie are ma rked. w 
same lettérs in the plan ar the section, 
pots or troughs into which the bars of iron are 
converted, F is the firéiplaée 5 P, ‘the’ fire bars. 3 and R, 
the ash-pit. GG, &e. are the flues, .H H isan arch, the 
inside of the bottom,of, which, corresponds. with the line 
IIKI » fg 1, a the, top. of it ‘is made it in the form. of a 
dome, having a hole in the centreat K, fe >, LL, &c.are 
six chimneys, MM ei similar to that of a glass-h Ouse, 
€oveting the Whole) At’ N’ there is an arched opening, at 
which the materials aretaken in and out of the furnace, and 
ai which i is closely. built up when the furnace is charged, 
At OO there a holes in each pot, through which the ends 
of three or four of the bars are made to project quite out 
of the furnace, These are called tasting bars, one of them 
being drawn out occasionally to see if the iron be suffi- 
ciently converted. 
. The pots are made of fire-tiles, or fire-stone. The bot- . 
toms of them are made of two courses, each course being 
hicknéss « of the single course which forms the 
f the pots. The insides of the pots are of one 
course, about double the thickness of the outside. The 
partitions of the, flues are made of ea which‘are of 
different thicknesses, as represented in the plan, and by 
dotted lines in the bottom of the pots, These are for sup- 
porting the sides of the pots, and for directing the flame 
- €qually round them, The great object is to communi- 
~-eate to the whole an equal degree of heat in every part. 
‘The fuel : put in at each end of the furnace, and the fire 
is made the whole length of the potsand kept up as equal- 
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