FURNACE. 
iron bar H, — 
venient height, or turned into one already area 
ive the reader a clear idea of the method of ufing 
this furnace, as well as the way in which the fuel fhould be 
placed, we have given, fg. 2, a vertical feCtion through 
the line CI, perpendicular to the front; and that the parts 
in each may be compared, we have ufed the fame letters of 
reference as far as the parts could be feen in each figure. 
When the fire is to be made up. for ufe, the muffle is 
to be placed in the furnace; one end refting cn the iron fup- 
port, as fhewnat K, fg. 1, and the other end is to be kept 
i of coak under eac 
coax, and at the back of the mufile {mall coak muft 
likewile be an in till it reaches about half way up the en 
olid piece of coak mruit thea be 8 which muft 
o.oo p 
large cnough to cover the end of the m imufie: and upon nt is 
a fecond piece muft be pla ee to fupply the place of the 
ficft when that is burned away = The {pac immedi- 
ately above the mufle muft be filled with middling fized 
pieces of coak, carefully building it up in the front, fo as 
to keep it even with the fides G,G. The door, as fhewn 
at jig. 3, 18 then to be alc in the front, prefiing it clofe 
up tothe fides G,G. ‘To light the fire, nothing more is 
neceflary - to fill the {pace under the mufHe with red-hot 
charcoal, by drawing the damper 
fuel will (pon be alight all over. 
in the our ection o 
fle fhewing g the ng of the dog oe which lies at 
n when the fire is in a ftate ror ule. For ie 
mult here iene ie it vill be aay neceflary to bea 
that gael {moothly down, that the ae Le - 
dial lies on may be placed fteadily up 
As it woul be aificuls i in this se . fhew the a 
tion of the dial-plate in the fire, we have given, at jig. 
a feGtion of the apparatus as it is placed un :der the Sn, 
urner. g thefe, the turner is firft placed fteadily 
tipon the bed of charcoal, and the. dial, being placed uz oa 
the ring, is la nearly: as Mars ein the centre of the 
planch, which is conveyed under the Area and placed upon 
e turne vi the {pring t ae as at fig. 6. en 
one fide of the plate is nearly melt ed, ie planch may be 
turned ro ie by y a flight touch with the tongs, till the whole 
Gial is complesely fufed all over, when it mult be withdrawn 
from the furnace, and placed jut in the front of the muffle 
to cool gradually. 
Fig. 4. is an end elevation of the muffie placed on the 
a at Chis ¥. 
Fig. g. is the iron we) an aperture in oe end, which 
fits the {quare pin, a, e door, as fhev ig. 3, an 
is ufed to oe fea coor from the ratths of rit furnace 
when it is 
Furn pou "Ss is of different farms, ear to the 
ae of f work st caft. See FounpEny and lron 
T URNACE, Gla, Hee See Grass. 
FURNACE for Gli Painters. See Parxtine on Glafs. 
Furnace, Hatt rs — 
eae, Lam 
Lamp. 
2 URNACE, Letter F ae. See a ee . 
Furnace, Melting. See Air-Furnac 
Furnace, Plumbers, is of three ree in the firft they 
melt the lead, whereof thie ets are to be caft. Thisis only a 
fort of large copper, or receptacle like a copper, made of fire- 
ftone, and coated well round with clay, having a little iron 
an at the bottom. In the fecond, they melt the lead to be 
caft in moulds for pipes, &e. aah are not to be foldered. 
The third is the tinning furnace, which is a {quare frame of 
wood, or fometimes a mafs of ftone-work, with brick hearth, 
whereon is made a charcoal fire, sea teeves them for the 
applying of thin tin leaves on the works. See PLUMBERY. 
Furnaces for baking Porcelain "ind Pottery. See Kitn 
and pone 
Furnaces, Portable. 
ao eer, Knight’s, Black’s, 
sla 8, ea aa 85 Ae 
ount of the ingenious ftructure of the furnace, and the 
application lea may be made of it to other and more im- 
portant ey is to be admired for equa- 
ei ‘at i in ‘every na rt of the crucible, or pot, in which 
the pipes, or other articles to be 
fame time aa the flame is 
foil the articles : eee 
> 
7 ot 
place, B, and enclofed within a furnace, D D, of brick-work, 
lined with fire-brick EE: between this ae and the cru- 
the fupports are 12 aks etween nile crucible and the lining, 
toe fe ih abigel of flues, as fhewn by the ene 
lines x, jig. 5, (the dotted circle eing the ava 
ribs are oa with occafional cpteaa (fee th 
i0 .) to conne& one flue with the adjoining ; ee 
the meet bearing of the crucible is taken from five piers, 
bbc, formed of haces s, projecting one over the other: one 
of thefe piers, ¢, is placed at the back of. the fire-place, and 
the other four at the fides 4, 4, and projeéting at the top, 
crucible, fo as to fupport and 
ning, and this has acir one opening ae ough it, leading int 
the chimne 
The io F E E, of the chimney i is open on one fide, ss 
the lan,) to form the door, at which the are tak 
in and out of the furnace ; ;_ the opening is ea clofed 
ashigh as 4, fig. 4, by aniron plate plaftered with fire-clay 5 
above this it is left open, and only clofed when the furnaee 
is str tena by temporary brick-work: when this is removed, 
e furnace can be filled or emptied through the opening ; 
om for this purpofe, the crucible has a fimilar opening in 
its fide : 
by an ingenious contrivance : 
layer of clay round the edge of the opening ; he then fticks 
the flems of broken pipes acrofs, sei one fide to the other, 
and plafters the _interitices with clay in a manner exa& ¥ 
fimilar to the lath and plafter uf fed j in buildin The whole 
of the crucible is pe in this manner ; the = ttom is com- 
pofed of a great number of fraginents of of Pipes, radiating to 
the 
