Improvements in Gas Stoves for Cooking and other Purposes.
Year: 1897

page_text: Date of Application, 1st Apr., 1897
Complete Specification Left, 1st Jan., 1898-Accepted, 26th Feb., 1898
Datg u Application, for Apr. 105
Complete Specification Left, 1st Jan., 1898-Accepted, 26th Feb., 1898
PROVISIONAL SPECIFICATION.
Improvements in Gas Stoves for Cooking and other Purposes.
I, ROBERT PRINGLE, of 11, Eliot Park, Blackheath, in the County of Kent, Doctor.
of Medicine, Brigade-Surgeon Lieutenant-Colonel (retired), do hereby declare the
nature of this invention to be as follows:
-
This invention has for its object the further adaptation of the gas heating
stove constructed on the principle described in the Specification of Letters Patent
dated the 11th day of June 1895 No. 11,430 to such purposes amongst others as
that of cooking food.
The stove comprises an outer casing of rectangular or other form having a door
or doors at front giving access to a roasting space and to a hot chamber above
which may serve as an oven and from which the roasting space is separated by a
horizontal partition. Around the sides and back of the casing is a row of vertical
heat radiating flues, preferably of earthenware, which open near the bottom of
the roasting space and communicate at top with the upper chamber. Beneath
the lower ends of the flues are the burners upon a gas pipe which connects with a
regenerative gas heating chamber contained in one of the flues. Air is admitted
to the burners through apertures at the bottom or lower part of the sides of the
casing, this air passing up into a lateral chamber traversed by the hoating flues, by
circulating around which the air becomes heated. The air passes thence down
between baffle plates to the bottom of the roasting space in proximity to the
burners therein. The top of the upper chamber is provided with holes (preferably
situated not directly over any of the heating flues) for the escape of the products
of combustion, these products being utilized for heating vessels which may be
placed upon a grating extending above the top plate of the stove. In order to
perimit of the discharge of the main portion of the hot products of combustion
being directed upon any particular vessel or vessels placed upon the grating, the
holes may be provided with removable lids, but as it is essential for the mainten-
ance of combustion that the means of exit for the draught should never be com-
pletely closed, the lids would be suitably perforated.
The ventilation of the upper portion of the roasting space is provided for pre-
ferably by means of perforations in the horizontal partition opening between the
walls of the stove and a baffle plate so arranged in the upper chamber that the
ascending currents of heated air are discharged within the upper chamber close
to the top of the latter. The amount of ventilation thus produced may be regu-
fated by means of a hit-and-miss damper.
Should it be sa desired the oven door might be provided with a row of carthen-
wore flues with all their adjuncts arranged similarly to those of the flues at the
sides and back of the stove, these flues passing through a plate carried by the

page_text: door and matching with the horizontal partition plate, the gas pipe supplying the
burners beneath these flues being suitably hinged.
100%
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
Improvements in Gas Stoves for Cooking and other Purposes.
I, ROBERT PRINGLE, of 11, Eliot Park, Blackheath, in the County of Kent, Doctor
of Medicine, Brigade-Surgeon, Lieutenant-Colonel (retired), do hereby declare the
nature of this invention and in what manner the same is to be performed, to be 1
particularly described and ascertained in and by the following statement:-
This invention relates to a gas-heated stove adapted for roasting, baking, and other
cooking purposes, constructed according to the principle of the stove for heating
purposes described in the Specification of Letters Patent dated the 11th day of
June 1895 No. 11,430.
The invention will be described with reference to the accompanying drawings
wherein Figures 1 and 2 are elevations in vertical section on planes at right angles
to one another. Figure 3 is a horizontal section of the lower part of the stove.
Figure 4 is a top plan.
The stove comprises an outer casing A of rectangular or other form which may a
be made of enamelled cast or sheet iron lagged with a non-conducting material.
It contains roasting spaces BB' separated only by a grating K so as to be at sub-
stantially the same temperature, the grating being removable in order that the
two chambers may form but one roasting chamber of large dimensions if required
for roasting a joint suspended from the top of the upper chamber B. Above the
chamber B and separated from it by a partition D is an oven C, access being had
to the spaces BB and oven C by doors E and F (Figure 2) also lagged with non-
'conducting material and provided with talc windows e and f and with brackets
supporting thermometers e visible through the windows. Within the casing
along the two sides and back of the lower chamber B is a lateral air-heating
chamber H formed by a sheet metal casing offset within the casing A and in the
top and bottom plates hh of which are fixed rows of vertical heat-radiating
flues & preferably of fireclay which tubes traverse the air-heating chamber H and
open at bottom to the lower roasting space B and at top to the space B'. In
the lower part of the roasting space B and beneath the bottom plate h¹ of the uir-
heating chamber I are burners i upon a gas pipe I which connects with a regenera-
tive gas heating chamber J formed by a vertical pipe contained in one of the
flues G, these burners being not directly in line with the flues G but towards one
side thereof and more or less beneath the bottom plate h¹ of chamber H so as to
be out of the way of fat or liquid falling through said flues. Air is admitted to the
chamber H through apertures 18 at the bottom or lower part of the casing A and
is caused by a baffle 3 to pass in an upward direction and to circulate around the
flues G, whereby the air becomes heated, and then downwards in the space between
the baffle and an inner baffle 5 situated between the baffle As and the flues G,
whereby it is caused to enter the lower part of the roasting space B at a point in
proximity to and below the level of the burners so that the flames will not be blown
inwards or be disturbed by the incoming current of air.
"
The horizontal grating K by which the roasting space B is divided from
the upper roasting space B' and upon which a joint of meat or a cooking utensil

page_text: may be placed, may correspond in dimensions to the space B bounded by the
walls of the air-heating chamber or it may extend over the flues G as shewn.
The inner wall h of the air heating chamber is extended downwards as a curtain h
of such depth as to confine the products of combustion and prevent them spreading
through the chamber B, and yet permit of the atmosphere of the latter chamber
being heated by direct radiant heat from the flames as well as from the heated flues
and walls of the chamber H. The gases pass through the flues G to the upper
roasting space B and thence through holes in the bottom plate D of the oven C
the draught and ventilation being regulated by a hit-and-miss damper L, a baffle L'
directing the gases upwards on leaving the apertures and preventing them spread-
ing until they reach the top plate c so that any food placed in the oven C will be out
of the drought and uncontaminated by the gaseous products. The top plate c of
the oven C is provided with apertures M for the escape of the heated gases, over
which cooking vessels may be placed.
The bottom of the roasting chamber B is mainly formed by a basting dish P
which is made removable by being fitted to slide in guides.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A gas-heated cooking stove comprising a roasting space having a hinged door
at front, and on the three other sides an air admission and heating chamber at the
lower part thereof, the upper part of the air heating chamber being offset or inwardly
projecting and being traversed by vertical flues leading from the space beneath
to the roasting space above, burners (supplied with regeneratively heated gas)
in the space (termed the combustion chamber) beneath the air heating chamber
but not directly beneath the flues, air inlets outside of a baffle rising within the
chamber and directing the incoming air against the flues, and a depending baffle
or curtain enclosing a downcast passage opening to the combustion chamber below
the level of the burners therein substantially as specified.
2. A gas-heated cooking stove comprising a roasting space having a hinged door
at front, and on the three other sides an air admission and heating chamber at the
lower part thereof, the upper part of the air heating chamber being offset or
inwardly projecting and being traversed by vertical flues leading from the space
beneath to the roasting space above, burners (supplied with regeneratively heated
gas) in the space (termed the combustion chamber) beneath the air heating chamber
but not directly beneath the flues, air inlets outside of a battle rising within the
chamber and directing the incoming air against the flues and a depending baffle
or curtain enclosing a downcast passage opening to the combustion chamber below
the level of the burners therein, and an inner curtain depending within the line
of the burners so as to separato the upper part of the combustion space from the
enclosed roasting space to such an extent as to prevent the flames being deflected
inwards and the products of combustion from passing up through the roasting
chamber, whilst permitting direct radiation of the heat from the flames to the
roasting space substantially as specified.
3. A gas-heated cooking stove comprising a roasting space having a hinged door
at front, and on the three other sides an air admission and heating chamber at
the lower part thereof, the upper part of the air heating chamber being offset or
inwardly projecting and being traversed by vertical flues leading from the space
beneath to the roasting space above, burners (supplied with regeneratively heated
gas) in the space (termed the combustion chamber) beneath the air heating
chamber but not directly beneath the flues, air inlets outside of a baffle rising
within the chamber and directing the incoming air against the flues and a depend-
ing baffle or curtain enclosing a downcast passage opening to the combustion
chamber below the level of the burners therein, an inner curtain depending within
the line of the burners so as to ensure the passage of the products of combustion
through the flues alone whilst permitting of direct radiation from the flames to the

page_text: roasting space, and a removable grating dividing the roasting space into a lower
space heated only by radiation and an upper space heated mainly by convection
currents from the flues discharging therein substantially as specified.
4. The gas cooking stove constructed substantially as herein described.
Dated this 1st day of January
1898
A. M. & WM. CLARK,
Chartered Patent Agents, 55, Chancery Lane, London.
A. M. & WM. CLARK,
Chartered Patent Agents, 55, Chancery Lane, London.