IMPROVE- MENTS IN STOVES FOR WARMING AND VENTILATING APARTMENTS AND BUILDINGS
Year: 1878

page_text: LETTERS PATENT to John Frederick Farwig, of 36, Queen Street, Cheapside, in
the City of London, Tin-ware Manufacturer, for the Invention of "IMPROVE-
MENTS IN STOVES FOR WARMING AND VENTILATING APARTMENTS AND
BUILDINGS."
Sealed the 6th June 1879, and dated the 14th December 1878.
PROVISIONAL SPECIFICATION left by the said John Frederick Farwig at
the Office of the Commissioners of Patents on the 14th December 1878.
JOHN FREDERICK FARWIG, of 36, Queen Street, Cheapside, in the City of London,
Tin-ware Manufacturer. "IMPROVEMENTS IN STOVES FOR WARMING AND VENTI-
LATING APARTMENTS AND BUILDINGS."
This Invention relates to improvements in slow combustion stoves acting on the
principle for admitting a current of fresh warm air into the room where they are
placed, and one part of my Invention consists in improved arrangements for feeding
the stove so as to prevent the escape of fumes and smoke into the room, and in the
adjustment of the draught so as to ensure slow combustion. Also in introducing
fresh air into the room warmed but without risk of being super-beated.
This improved calorigen or stove consists of an inner body or fire box made of
fire clay or cast iron formed either round or square. At the base of this inner body
is an iron grating through which air is admitted to support combustion.
The smoke pipe is placed near the top of the stove, and facing the smoke pipe is
the feed door which is so arranged that when opened for the purpose of feeding, a
strong current of air rushes in and through the stove up the flue, thus preventing
any escape of smoke or fumes from the ignited fuel into the room.
Beneath the iron grating is an ash pit into which is fixed a sliding valve which
may be adjusted to suit any draught, also an ash door which can be removed for
the purpose of raking out the ashes.

page_text: The inner stove is surrounded or encased with thin sheet iron or any other suit-
able material, and formed with one or more air chambers (which communicate with
the external atmosphere), and when heated cause a constant stream of warmed
fresh air to flow into the room.
Between the fresh air chamber and the inner body (which contains the fuel)
space is left for a current of air to circulate and escape into the flue which effectually
prevents the fresh air chamber from being super-heated, and also carries off the
unpleasent radiated heat and any impurities given off by the heated chamber.
The inner body containing the fuel for combustion may be renewed without
damage to the outer casing.
I find it advantageous to use coke broken into small pieces, but other kinds of
fuel may be employed.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said John Frederick Farwig in the Great Seal Patent Office on the 13th June
1879.
JOHN FREDERICK FARWIG, of 36, Queen Street, Cheapside, in the City of London,
Tin-ware Manufacturer. "IMPROVEMENTS IN STOVES FOR WARMING AND VENTI-
LATING APARTMENTS AND BUILDINGS."
This Invention relates to improvements in slow combustion stoves acting on
the principle for admitting a current of fresh warm air into the room where they
are placed, and one part of my Invention consists in improved arrangements for
feeding the stove so as to prevent the escape of fumes and smoke into the room;
and in the adjustment of the draught so as to ensure slow combustion. Also in
introducing fresh air into the room, warmed, but without risk of being super-
heated.
This improved calorigen or stove consists of an inner body or fire-box made
of fire-clay or cast iron. formed either round or square. At the base of this
inner body is an iron grating through which air is admitted to support com-
bustion.
The smoke pipe is placed near the top of the stove, and facing the smoke pipe is
the feed door which is so arranged that when opened for the purpose of feeding a
strong current of air rushes in and through the stove into the flue thus preventing
any escape of smoke or fumes from the ignited fuel into the room.
Beneath the iron grating is an ash pit into which is fixed a sliding valve which
may be adjusted to suit any draught, also an ash door which can be removed for
the purpose of raking out the ashes.
The inner stove is surrounded or encased with thin sheet iron or any other suit-
able material, and formed with one or more air chambers (which communicate with
the external atmosphere), and when heated cause a constant stream of warmed
fresh air to flow into the room.
Between the fresh air-chamber and the inner body (which contains the fuel)
space is left for a current of air to circulate and escape which effectually prevents
the fresh air-chamber from being super-heated, and also carries off the unpleasant
radiated heat and any impurities given off by the heated chamber.
The inner body containing the fuel for combustion may be renewed without
damage to the outer casing.
I find it advantageous to use coke broken into small pieces, but other kinds of
fuel may be employed.
And in order that my Invention may be the more clearly understood, I will now
describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows a front elevation of my improved slow combustion stove; Figure
2 is a vertical section thereof taken on the line 1, 1, of Figure 1, and Figure 3 is a
horizontal section taken on the line 2, 2, of Figure 1. a is the fire-box or inner
body which I find it advantageous to make of cast iron, although fire-clay or other
suitable material may be used. At the base of the fire-box or inner body is the
grating a' for supporting the fuel, it is made in two parts in order that it may be
introduced into its place, and is supported by an inner flange as shown. a² is the
smoke pipe placed near the top of the inner body or fire-box, and immediately
opposite this pipe is the feed opening which is closed by a sliding door a*. a
are side cheeks secured to the fire-box to prevent any fuel falling into the space
between it and the outer casing, it also forms a guide for the sliding door at; by this
arrangement when ever the feeding door is opened a strong through draft is created,
thereby effectually preventing the escape of noxious fumes into the room. b is the

page_text: ash pit formed in a separate casting and firmly secured to the inner body or fire-box,
flanges being cast on it for this purpose; the front of the ash pit is closed by a
transversely sliding door b¹, and also by a regulating valve 63 in order that the
amount of air admitted to the fuel may be controlled.
Surrounding the inner body or fire-box a and firmly fixed thereto there is a thin
sheet iron casing c forming the outer wall of the stove, and between the inner body
or fire-box a and this outer casing c the fresh air-heated chamber dis placed, its
form being clearly indicated in Figure 3. The fresh air enters the chamber d by
the inlet pipe d' and after circulating through it escapes at d³ through an opening
in the casing. I would here state that this opening may be closed by a cover
when the stove is not in use in order to prevent the entry of cold air into the
room.
e is a flue fitted to the outer casing to carry off any vitiated air from the air
space or chamber e between the outer casing, and the fire-box, and fresh air heating
chamber d; this also cause a current of air to be set up in this chamber e¹, e¹,
thereby effectually preventing any over heating of the fresh air heating chamber,
and consequent superheating of the fresh air. f is a door in the outer casing to
obtain access to the sliding door a, for the purpose of feeding the stove. g is a
perforated cover to the stove which may be removed at pleasure, not being perma-
nently fixed to it. h, h, are ornamental strengthening rings, and i, i, are feet
supporting the stove.
When commencing to light the stove the ash pit door b¹ should be fully open,
and after the fire is well alight the stove may be filled up to the feeding opening a³,
the ash pit door should then be closed and the amount of air admitted regulated
by the valve b².
Coke broken up small I find to be a very suitable fuel, although other kinds may
be used with an equally good result.
Having thus described the nature of my Invention, and the manner of per-
forming the same, I would have it understood that I do not claim any of the parts
separately which are well known, but what I claim is,―
The construction and arrangement of stoves for warming and ventilating, sub-
stantially as described, and shown by the Drawings.
I also claim the combination of the inner body or fire box a with casing c and
fresh air heating chamber d constructed and arranged substantially as shown and
described.
In witness whereof, I, the said John Frederick Farwig, have hereunto set my
hand and seal, this Twelfth day of June, in the year of our Lord One thou-
sand eight hundred and seventy nine.
Witness,
J. G. TONGUE,
34, Southampton Buildings,
W.C.
JOHN F. FARWIG. (L.S.)