IMPROVEMENTS IN MEANS-OR APPARATUS EMPLOYED IN THE COMBUSTION OF GAS IN GAS STOVES, AND BURNERS EMPLOYED IN HEATING AND COOKING
Year: 1866

page_text: LETTERS PATENT to John Calvin Thompson, of 14, Burney Street,
Greenwich, in the County of Kent, for the Invention of "IMPROVEMENTS
IN MEANS-OR APPARATUS EMPLOYED IN THE COMBUSTION OF GAS IN GAS STOVES,
AND BURNERS EMPLOYED IN HEATING AND COOKING."
Sealed the 25th May 1866, and dated the 13th January 1866.
i
PROVISIONAL SPECIFICATION left by the said John Calvin Thompson
at the Office of the Commissioners of Patents, with his Petition, on
the 13th January 1866.
Invention for "Im-
COMBUSTION OF GAS IN
COOKING," to be as
I, JOHN CALVIN THOMPSON, of 14, Burney Street, Greenwich, in the County
of Kent, do hereby declare the nature of the said
PROVEMENTS IN MEANS OR APPARATUS EMPLOYED IN THE
GAS STOVES, AND BURNERS EMPLOYED IN HEATING AND
follows:-
The Invention has for its object improvements in means or apparatus
employed in the combustion of gas in gas stoves, and burners employed in
heating and cooking. For this purpose I employ a chamber, into the interior
of which gas is admitted from a jet or jets, and becomes mixed therein with
atmospheric air. This mixing chamber consists of an inner and outer tube,
forming an annular chamber, the top of which is covered with a ring of finely
perforated metal or wire gauze, on the upper surface of which the mixture of
gas and atmospheric air is burnt.. The bottoni of this annular mixing
chamber is closed with a plate of metal having suitable apertures therein.
for the purpose of admitting atmospheric air to the annular chamber to

page_text: become mixed with the gas therein. This chamber is placed at the lower
part of a suitably formed case or cylinder of sheet iron or other suitable
material, in the interior of which is fixed a conical tube, the lower and larger
end of which fits within and is fixed to the outer case or cylinder a short
distance above the mixing chamber. To the interior of this conical tube,
and at the upper and smaller end thereof is fixed another conical tube, the
lower and smaller end of which descends a short distance below the surface
of the wire gauze or perforated metal, above which the mixture of gas and
atmospheric air is burnt. The atmospheric air between the two conical tubes
becomes highly heated, and thereby induces a current of-air down the inner
conical tube, whereby the flame is caused to descend, and a more perfect
combustion of the gas takes place. The atmospheric air is prevented rising
to an objectionable degree from the lower part of the case or cylinder by
means of a diaphragm of wire gauze or perforated metal.
In applying my Invention to ordinary gas burners for the purpose of
varming food or otherwise I employ a mixing chamber closed at the lower
"end by means of finely perforated metal or wire gauze, in the centre of which
is fixed a conical tube, the upper and smaller end thereof coming just below
the top of the chamber, which is also covered with finely perforated metal or
wire gauze. This mixing chamber is placed over any suitable burner, the
gas from which rises up the conical tube in the centre thereof, and becomes
mixed with atmospheric air, which enters the chamber partly through the
wire gauze or perforated metal, closing the lower end thereof, and partly
around the burner through the conical tube.
through the conical tube. The mixture of gas and
atmospheric air is burnt on the upper surface of the wire gauze or perforated
metal cover of the mixing chamber, the centre of this cover being protected
from too intense a heat by means of a plate of metal or other suitable
material fixed thereto, this plate also acting to ensure-a more perfect mixture
of the gas and atmospheric air.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Calvin Thompson in the Great Seal Patent Office
on the 13th July 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
CALVIN THOMPSON, of 14, Burney Street, Greenwich, in the County of Kent,
send greeting.
WHEREAS Her niost Excellent Majesty Queen Victoria, by Her Letters

page_text: Patent, bearing date the Thirteenth day of January, in the year of our Lord
One thousand eight hundred and sixty-six, in the twenty-ninth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said John Calvin Thompson, Her special licence that I, the said
John Calvin Thompson, my executors, administrators, and assigns, or such
others as I, the said John Calvin Thompson, my executors, administrators,
and assigns, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of
Man, an Invention for "IMPROVEMENTS IN MEANS OR APPARATUS EMPLOYED IN
THE COMBUSTION OF GAS IN GAS STOVES AND BURNERS EMPLOYED IN HEATING AND
COOKING," upon the condition (amongst others) that I, the said John Calvin
Thompson, my executors or administrators, by an instrument in writing under
my, or their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the same
was to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of the
said Letters Patent.
. i
NOW KNOW YE, that I, the said John Calvin Thompson, do hereby declaro
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
The Invention has for its object improvements in means or apparatus
employed in the combustion of gas in gas stoves, and burners employed in
heating and cooking. For this purpose I employ a chamber into the interior
of which gas is admitted from a jet or jets and becomes mixed therein with
atmospheric air; this mixing chamber consists of an inner and outer tube
forming an annular chamber, the top of which is covered with a ring of finely
perforated metal or wire gauze, on the upper surface of which the mixture
of gas and atmospheric air is burnt. The bottom of this annular mixing
chamber is closed with a plate of metal having suitable apertures therein for
the purpose of admitting atmospheric air to the annular chamber to become
mixed with the gas therein. This chamber is placed at the lower part of a
suitably formed case or cylinder of sheet iron or other suitable material, in
the interior of which is fixed a conical tube, the lower and larger end of
which fits within and is fixed to the outer case or cylinder a short distance
above the mixing chamber. To the interior of this conical tube and at the
upper and smaller end thereof is fixed another conical tube, the lower and

page_text: smaller end of which descends a short distance below the surface of the wire.
gauze or perforated metal, above which the mixture of gas and atmospheric
air is burnt. The atmospheric air between the two conical tubes becomes
highly heated, and thereby induces a current of air over the flame and down
between the inner conical tube and the mixing chamber, and thence up the
inner conical tube, whereby the flame is caused to descend and a more perfect
combustion of the gas takes place. The atmospheric air is prevented rising:
to an objectionable degree from the lower part of the case or cylinder by
means of a diaphragm of wire gauze or perforated metal.
In applying my Invention to ordinary gas burners for the purpose of
warming food or otherwise I employ a mixing chamber closed at the lower
end by means of finely perforated metal or wire gauze, in the centre of which
is fixed a conical tube, the upper and smaller end thereof coming. just below
the top of the chamber, which is also covered with finely perforated metal or
wire gauze.
This mixing chamber is placed over any suitable burner, the
gas from which rises up through the conical tube in the centre thereof and
becomes mixed with atmospheric air which enters the chamber partly through
the wire gauze or perforated metal closing the lower end thereof, and partly
around the burner through the conical tube. The mixture of gas and
atmospheric air is burnt on the upper surface of the wire gauze or perforated
metal cover of the mixing chamber, the centre of this cover being protected
from too intense a heat by means of a plate of metal or other suitable material
fixed thereto, this plate also acting to ensure a more perfect mixture of the
gas and atmospheric air.
And in order that my Invention may be more fully understood and readily
carried into effect I will proceed, aided by the accompanying Drawings, to
describe the means I have found to answer in performing the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a sectional side view of a gas stove constructed according to my
Invention, and suitable for warming apartments and other places; Figure ?
is a plan with the cap or cover removed, and Figure 3 is a sectional plan
thereof taken at the line 1, 1, Figure 1. a, a, is a mixing chamber, into
the interior of which gas is admitted by the pipe band perforated tube b¹;
this chamber is as shown in the Drawings, of an annular form, and
consists of an inner tube a¹ and outer tube a, the lower ends of these
tubes being connected together by the perforated plate a³, whilst the upper
ends are connected together by a finely perforated metal plate a', or the
upper and lower ends of this annular chamber may be covered with wire

page_text: gauze. This mixing chamber, an, under side view of which is shown separately.
at Figure 4, is placed at the lower end of a case or cylinder c of sheet iron or
other suitable material, and is supported on the stand c'. Within the case or
cylinder c is fixed a conical tube d, the lower and larger end of which fits
tightly within the case or. cylinder c, whilst the upper end is fixed to the
case. c as shown, or by other suitable meaus. To the upper and smaller
end of the conical tube d is fixed another conical tube e, the lower and
smaller end of which terminates a little below the plate a' of the mixing
chamber a.
The action of the stove is as follows:-Gas is admitted by the pipe b and
perforated ring burnor b¹, or by other suitable means into the annular mixing
chamber a, within which it becomes mixed with .atmospheric air which rises
into such annular mixing chamber through the perforated plate. a³; the
mixture of gas and atmospheric air is burnt on the upper perforated surface a
of the mixing chamber a, the air between the conical tubes d and e becomes
highly heated, thereby inducing a current. of air through the perforations c³ in
the case c in the direction shown by the arrows, the air thence passes over the
perforated surface a' down between the annular mixing chamber a and the
conical tube e, then up the conical tube e and out through the perforations.in.
the ornamental cap or cover c, by these means a downward current is
produced over the flame, thereby causing the flame to descend and a more
perfect combustion of the gas 'to. take place. as is a diaphragm of wire gauze
or perforated metal applied as shown, by which the air is prevented rising to
an objectionable degree from the lower part of the case or cylinder c. The
perforations c serve to prevent the outer case or cylinder c becoming too
highly heated, the dotted circle c³ represents a hole through which access is
obtained to light the mixture of gas and atmospheric air.
I would have it understood that the apparatus shown in the preceding
Figures is also applicable to stoves employed in cooking and heating various
substances, and a competent mechanic will readily make such modifications
as will be necessary to apply it to such purposes. Figure 5 is a plan;
Figure 6 a sectional side view; and Figure 7 an under side view, full size,
of a mixing chamber, suitable for being applied over an ordinary burner.
This mixing chamber consists of a case f, f, of any suitable form, the upper
and lower surfaces f¹, f, of which are covered with finely perforated metal or
wire gauze; to the centre of the lower surface f of this chamber is fixed a
conical tube 9, which terminates a short distance below the perforated metal
cover f. In the Drawing this mixing chamber is shown to be supported by
the gallery of an ordinary burner, the gas passes into this mixing chamber

page_text: from the burner h through the conical tube g and becomes mixed with atmo-
spheric air rising into such mixing chamber partly through the perforated
surface and partly through the conical tube g around the burner h. The
mixture of gas and atmospheric air is burnt on the upper surface of the
perforated metal cover f¹, a plate f³ of metal or other suitable material is
fixed to the centre of the perforated metal cover f¹ in order to protect such
cover from too intense a heat at that part, and at the same time by deflecting
the current of gas entering the mixing chamber to ensure a more perfect
mixture of the gas and atmospheric air. This form of mixing chamber is
particularly adapted to the warming of food and other substances in nurseries
and other places, the vessel containing the substance to be warmed being
placed on the projections f*.
I would have it understood that although I have described the mixing
chamber or burner shown in Figures 5, 6, and 7, to be applied over an
ordinary burner for heating comparatively small quantities of food or other
substance, one or more of such mixing chambers or burners may be applied to
a gas stove for heating and cooking. I have not however thought it
necessary to show such an adaptation as a competent mechanic will readily
make the modifications necessary to apply it to such a purpose.
Having thus described the nature of my said Invention, and the means I
employ in carrying the same into effect, I would have it understood that I do
not confine myself to the precise details herein shown and described; but what
I do claim is. the combined arrangements of apparatus employed in the com-
bustion of gas in gas stoves and burners employed in heating and cooking
substantially as herein shown and described.
In witness whereof, I, the said John Calvin Thompson, have hereunto
set my hand and seal, this Sixth day of April, in the year of our Lord
One thousand eight hundred and sixty-six.
JOHN CALVIN THOMPSON. (L.S.)
Witness,
B. J. B. MILLS,
Patent Agent,
35, Southampton Buildings,
Chancery Lane.

page_text: No text detected.