Improvements in Gas Condensing Stoves.
Year: 1891

page_text: Date of Application, 11th Sept., 1891
Complete Specification Left, 3rd June, 1892-Accepted, 16th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Gas Condensing Stoves.
I, THOMAS EUSTACE BARRALET of 51 Queen Victoria Street, City in the
County of London, Secretary, do hereby declare the nature of this invention to
be as follows:-
This invention has for its object improvements in gas condensing stoves, that is,
heating and lighting stoves in which the products of combustion are to a large
extent condensed by contact with the cold surfaces of tubes and chambers through
which they are passed and relates to means whereby a more perfect combustion is
secured, the use of glass or metal chimneys is dispensed with, and the greater part
of the heat is thrown downwards by direct radiation instead of passing out of the
stove as heated air as in the condensing stoves hitherto made.
For this purpose. I construct the stove with a top and bottom chamber con-
nected by one or more tubes, (which I will call the side tubes).
I also have another tube (which I will call the main tube) which may or may
not extend to the botton chamber but which opens only into the top chamber.
Inside the main tube, near the bottom, I fix a gas burner and a little above the
burner a plate of metal (or otherwise as hereinafter described) fixed so as to leave
a space between its edge and the main tube. This plate may be flat, concave or
convex, and I prefer to make it of metal with a backing of fireclay or other nou-
conducting material, but it may be metal alone or non-conducting material with or
without a metal backing or framework.
The plate may be suspended from the top chamber or supported from beneath
or fixed at the sides of the main tube or in any other manner.
I prefer to fix it at the lower end of an air tube which runs up inside the main
tube and out at the top of the stove and is provided with an opening near the lower
end to admit the external air and is open at the top to discharge the same after it
has been warmed.
There are also air tubes entering at the bottom of the stove & passing out at
the top, open at each end and with openings into the bottom chamber for the
purpose hereinafter mentioned.
The action of the stove is as follows:
The heat from the burner strikes the plate above, which becomes heated and
deflects the greater part of the heat downwards to the floor, at the same time
causing a more perfect combustion.
Any heat not thus deflected, together with the products of combustion, ascends
between the plate & the main tube to the top chamber & then descends the side
tubes to the bottom chamber. The cold surfaces of these cause a condensation of
much of the product of combustion into a liquid form, which liquid falls into the
bottom chamber & thence through an aperture into a suitable receiver placed
beneath. The air in the bottom chamber, after being thus purified, passes through
the above mentioned openings into the side air tubes, where it nixes with the
fresh air entering at the lower end of the same & is again heated & passes out at
the top of the stove.
Dated this 11th day of September 1891.

page_text: COMPLETE SPECIFICATION.
Improvements in Gas Condensing Stoves.
I, THOMAS EUSTACE BARRALET, of 51 Queen Victoria Street, City, in the
County of London, Secretary, 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 has for its object improvements in gas condensing stoves; that
is, heating and lighting stoves in which the products of combustion are to a large
extent condensed by contact with the cold surfaces of tubes and chambers through
which they are passed, and relates to means whereby a more perfect combustion is
secured, the use of glass or metal chimneys is dispensed with, and the greater
portion of the heat is thrown downwards by direct radiation instead of passing out
of the stove as heated air, as in the condensing stoves hitherto made.
For this purpose I construct the stove with a top and bottom chamber a & b
connected by one or more tubes (which I will call the side tubes) c. c.
I also have another tube d (which I will call the main tube) which may or may
not extend to the bottom chamber 6 but which is open only to the top chamber, a.
Inside this main tube d, or a little below the bottom, I fix a gas burner, e, and a
little above the burner a plate or block f of metal, or fireclay or other non-
conducting material, or a combination of the two, fixed so as to leave a space
between its edge and the side of the main tube, d. This plate or block may be
flat, concave, convex, conical, or any other shape, and may be suspended from the
top chamber, a, or supported from beneath, or fixed at the sides of the main tube,
or in any other manner.
It may be perforated with one or more holes (as in Figure 3) in which case it
may or may not extend to the sides of the main tube, d.
In Figures 1 and 2 I shew the plate or block, f, fixed at the bottom of an air
tube which runs up inside the main tube d and out at the top of the stove, and
is provided with an opening near the lower end to admit the external air and is
open at the top to discharge the same after it has been warmed.
There are also air tubes h, h entering at the bottom of the stove and passing
through the side tubes c. c. and out at the top, open at each end, and with openings
into the bottom chamber for the purpose hereinafter mentioned.
The drawings attached indicate one form in which the stove may be made;
Figure 1 is in elevation (half section), Figure 2 is a section through the
middle, and Figure 3 represents another arrangement of the deflecting plate, f.
The action of the stove is as follows:
α,
The heat from the gas burner e strikes against the plate above f, which becomes
hot and deflects the greater part of the heat downwards to the floor, and at the
same time causes a more perfect combustion. Any heat not thus deflected,
together with the products of combustion, ascends between the plate, and
the sides of the main tube d or through the plate to the top
chamber and then descends down the side tubes, c. c. to the bottom
chamber, b. The cold surfaces of these cause a condensation of much of the
products of combustion into a liquid form, which liquid falls to the bottom
chamber band thence through an opening into a suitable receptacle placed beneath.
The air in the bottom chamber, b, being thus purified passes through the above
mentioned openings into the side air tubes, h. h. where it mixes with the fresh air
entering at the bottom of the same, and ascending, is again heated and, passes out
at the top of the stove..
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what 1
claim is:
In a gas stove, the combination of a plate or block fixed above the burner

page_text: to deflect the heat with tubes or chambers for condensing the products of
combustion.
Dthin Thind dat 1000
Witness,―
A. SIGGERS,
Strutton Ground, Westminster.
T. E. BARRALET.