Improvements relating to Hot-air (Gas) Stoves.
Year: 1890

page_text: Date of Application, 20th June, 1890
Complete Specification Left, 20th Mar., 1891-Accepted. 23rd May, 1891
Improvements relating to Hot-air (Gas) Stoves.
We ROBERT WALLACE MACKINLAY and HARRY DARWIN, trading together
under the style or firm of Mackinlay Darwin & Company, Glasgow, North
Britain, Gas Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to hot-air stoves which are heated by means of gas, and
has for its objects;
1st. To effect the heating of apartments with a smaller consumption of gas than
has been hitherto attained with hot-air stoves;
2nd. To impart a natural degree of moisture to the hot air which is given off by
them.
In carrying out our invention we construct the body of our improved hot-air
(gas) store of metal gill-plates each containing a central aperture which forms a
suitable fire space or chamber when a number of the gill-plates are fastened
together and terminated with plates for closing in the back and front extremities
of the stove.
Within this inner or fire chamber we fit a fire brick lining and enclose a gas fire
therein, in close contact with the fire bricks and above the top of the gills we
place a pan of water which is protected from the heat of the stove beneath it by
non-conductor packing. A cover with perforated centre part is fitted over this
water tray, and solid plates box in the gills on either side having suitable apertures
at the lower extremities for admitting cold air and at the upper ones to give it vent
into the compartment which encloses the pan of water. A fire door containing
transparent or other panels is fitted at each or either end of the stove and affords
convenient access to the fire. The burners. are easily accessible from beneath
and an exhaust flue is attached to the stove at any convenient part for conveying
the waste products which arise from the burning gas fire," to the vicinity of an
empty pan or tray.
When the stove is in operation the air which enters at the base of the gills
becomes heated as it ascends and passes through apertures provided for it into the
confined space above the (top) water pan where it flows over the surface of the
water in the dish before named and thereby derives a slight and natural degree of
moisture before it is emitted into the apartment.
In ordinary (gill) hot air stoves the fire consists of coke, coal or other solid
fuel and the gills are open to the atmosphere with (sometimes) a water vessel in
close proximity to or placed upon the stove; the water being heated and
evaporated as steam into the apartinent; and in gas heating stoves naked flames
alone have hitherto been employed for warming purposes and our improvements
consist
63
Ist. In the substitution of a gas fire in place of coal, coke or naked gas
flames as the heating medium;
2nd. In arresting and detaining the heat of the gas flames therein by means of
enclosing fire bricks which communicate the heat to the intermediate gill plates ;
3rd. In moistening the air which is warmed; by enclosing the gill plates in
chambers and directing all the hot air arising from them into a water chamber before
it is discharged into the apartment;
4th. The means employed in conjunction with our heating stove for the
condensation of vapours arising from the gas flames; and

page_text: 5th. In the combination of a gas-jet stove a gas-fire heating stove—a_gill
stove a hot air stove-and a condensing, flue-less, gas stove all in one apparatus.
Dated this 19th day of June 1890.
JOSEPH
LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Inventors.
COMPLETE SPECIFICATION.
Improvements relating to Hot-air (Gas) Stoves.
We, ROBERT WALLACE MACKINLAY of 110 Great Wellington Street, Glasgow
and HARRY DARWIN of 618 Eglinton Street Glasgow, lately trading together
under the style or firm of Mackinlay, Darwin & Company, at 110 Great Wellington
Street, Glasgow, North Britain, Gas Engineers do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to hot-air stoves which are heated by means of gas and
has for its objects;
1st. To effect the heating of apartments with a smaller consumption of gas than
has been hitherto attained with hot-air stoves;
2nd. To impart a natural degree of moisture to the hot-air which is given off by
them.
In carrying out our invention we construct the body of our improved hot-air
(gas) stove of metal gill-plates each containing a central aperture which forms a
suitable fire space or chamber when a number of the gill-plates are fastened
together and terminated with plates for closing in the back and front extremities of
the stove.
66
gas
Within this inner or fire chamber we fit a fire brick lining and enclose a
fire therein, in close contact with the fire bricks and above the top of the gills
we place a pan of water which is protected from the heat of the stove beneath it
by non-conductor packing. A. cover with perforated centre part is fitted over this
water tray, and solid plates box in the gills on either side having suitable apertures
at the lower extremities for admitting cold air and at the upper ones to give it vent
into the compartment which encloses the pan of water. A fire door containing
transparent or other panels is fitted at each or either end of the stove and affords
convenient access to the fire. The burners are easily accessible from beneath and
an exhaust flue is attached to the stove at any convenient part for conveying the
waste products which arise from the burning "gas fire."
When the stove is in operation the air which enters at the base, of the gills
becomes heated as it ascends and passes through apertures provided for it into the
confined space above the (top) water pan where it flows over the surface of the
water in the dish before named and thereby derives a slight and natural degree of
moisture before it is emitted into the apartment.
In ordinary (gill) hot-air stoves the fire consists of coke, coal or other solid fuel
and the gills are open to the atmosphere with (sometimes) a water vessel in close
proximity to or placed upon the stove; the water being heated and evaporated as
steam into the apartment; and in gas heating stoves naked flames alone have
hitherto been employed for warming purposes and our improvements consist;
1st. In the substitution of a 6 gas fire
in place of coal, coke or naked gas
flames as the heating medium;
2nd. In arresting and detaining the heat of the gas flames therein by means
of enclosing fire bricks which communicate the heat to the intermediate gill
plates;
3rd. In moistening the air which is warmed, by enclosing the gill plates in
chambers and directing all the hot air arising from them into a water chamber
before it is discharged into the apartment;

page_text: 4th. In the means employed in conjunction with our heating stove for the
condensation of vapours arising from the gas flames; and
5th. In the combination of a gas-jet stove, a "gas fire" heating stove-a gill
stove a hot air stove and a condensing gas stove all in one apparatus.
In order that our invention may be more clearly understood and more easily
carried into effect we have prepared the accompanying drawings in which ;-
Figure 1 is a front view in elevation of our improved stove;
Figure 2 is a sectional view in elevation through A A Figure 1. shewing the
internal construction of the said stove;
Figure 3 is a similar sectional elevation to Figure 2 but illustrating a slightly
modified construction of the stove interior.
Similar letters of reference and numerals are employed throughout these
illustrations to indicate corresponding parts.
On referring to Figure 1B is a fire door made of any suitable materials, C, is
an air way leading to the fire and the gills, D and E, are perforated parts for
permitting the exit of heated air into the apartment.
In Figure 2 F represents one of our improved gas fires, (No. 9531 Patent appli-
cation of 1890) fitted within the flame chamber &; the parts marked 2 are the
frets of our improved gas fire composed of metal or fire clay and placed in near
proximity to the fire brick walls 2. The flue marked G¹ is formed by a succession
of gill plates K the one which is farthest removed from the fire being employed to
form the flue H leading into the exhaust tube J. The gas burner beneath the
gas fire "frets is represented by L, a non-conductor roof to the flame chamber
by M, the water pan by N, the hot-air chamber by P and the pan for condensed
vapours by Q.
"
Referring to Figure 3 which shews a stove with slight variations from that shewn
in Figures 1 and 2, these variations consist in the omission of the fire door B the
tube J, the pan Q and a smaller number of gill plates which are pierced with
several tubes 2, instead of the large one marked G' Figure 2. The part marked j²
is an exhaust flue, and that marked c² an inlet for fresh air. The arrows upon
the drawings indicate the directions pursued by the various currents of pure or
vitiated air.
From the fact that the gas fire and gill plates are completely enclosed within
an enveloping case we are enabled to control the pure hot-air currents so
completely that we are enabled to direct them into almost any course we desire
and are thereby enabled to discharge them across the face of the water which
is in the pan marked N. The hot-air current has thereby imparted to it a more
natural degree of moisture than has hitherto been obtainable in connection with
such hot-air stoves.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that we
claim is ;-
1st. In a gas heating stove the combination therewith of a water vessel N all
substantially as herein described and shewn or any mere modification thereof
and for the purpose specified;
2nd. In a gas heating stove the combination of mechanical parts all substantially
as herein described and shewn or any mere modification thereof for the purposes
specified.
JOSEPH
LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Inventors.