IMPROVEMENTS IN PORTABLE Gas Cooking ApparATUS
Year: 1873

page_text: LETTERS PATENT to François Alphonse Jacquet, of Boulevard
Magenta, 89, at Paris, Manufacturer, for the Invention of
" IMPROVEMENTS IN PORTABLE Gas Cooking ApparATUS.”
PROVISIONAL SPECIFICATION left by the said François Alphonse
Jacquet at the Office of the Commissioners of Patents, with his
Petition, on the 24th December 1873.
I, FRANÇOIS ALPHONSE JACQUET, of Boulevard Magenta, 89, at Paris,
Manufacturer, do hereby declare the nature of the said Invention for
“IMPROVEMENTS IN PORTABLE GAS COOKING APPARATUS,” to be as follows:-
-
In the apparatus ordinarily employed for cooking by gas when the
pan or other cooking vessel is placed over the burner the gas flame is
caused to spread out in a smoky condition, evolving unpleasant and
unwholesome products due to imperfect combustion.
My Invention relates to a construction and arrangement of burner
apparatus whereby this defect is remedied, and the gas is more completely
utilised as a heating medium.

page_text: The construction which I will describe is applicable either for cooking
or in combination with a stove casing for heating air, and may be
arranged either singly or with two or more sets in one apparatus.;
I will first describe the single burner and parts connected therewith.
It consists of an annular chamber pierced with a number of holes
through its interior periphery, and surmounted by a flat ring having a
number of radial ribs projecting from it fixed at a little distance above
the annular chamber, these ribs serving to support the pan or other
utensil to which the heat is to be applied. From one side of the annular
chamber projects a tubular handle, by which the whole can be lifted or
moved. Through the centre of this tubular handle the gas is supplied by
a connection made by a flexible tube or otherwise with the supply pipe,
and through holes in the sides of the tubular handle air enters and
mingles with the gas. The mixture of air and gas issues by the small
holes in the inner face of the tubular chamber, and being lighted
produces a series of flame jets of high heating power due to the complete
combustion of the gas. These flame jets are caused by the indraught of
air between the annular chamber and the flat ring above it to converge
towards the centre of the utensil placed upon the radial ribs, and having
impinged upon the vessel, are spread out radially over its bottom by the
ribs on which it rests.
In order to increase the heating power a concave reflector is fixed
under the middle of the burner so as to reflect upwards on the utensil
the heat which would otherwise be radiated downwards. Two or more
such burner apparatus may be arranged in one framing, supplied with
gas and air either each by its separate tubular handle, or by a single
such tubular channel branching to the several burners, and above the
radial ribs may be fixed a flat plate or table, which may either serve as a
hot plate, or may have in it circular holes immediately above the burners,
over which holes the utensils to be heated can be placed.
In applying a burner apparatus such as has been described above for
stove heating I enclose it in a casing standing on a hollow pedestal.
This pedestal has lateral openings, through which enters the air to be
heated, and from the pedestal a tube passes upwards through the middle
of the burner, and above the burner expands in a conical form, whence
there are openings for the escape of air at or near the top of the stove
casing. The flame of the burner plays on the exterior of the conical

page_text: tube, and the products of combustion are carried by several pipes passing
through the conical tube to an exit pipe, and then to a chimney or other
discharge; thus, the cool air entering the hollow pedestal, and passing
upwards by the conical tube, is heated in its ascent, and escapes in a
5 warmed condition at the upper part of the casing, while the products of
combustion are entirely separated from the air thus warmed, and are
carried off without vitiating the atmosphere of the apartment which the
stove is employed to heat.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said François Alphonse Jacquet in the Great Seal Patent
Office on the 17th June 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANÇOIS
ALPHONSE JACQUET, of Boulevard Magenta, 89, at Paris, Manufacturer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of December, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said François Alphonse Jacquet, Her
special license that I, the said François Alphonse Jacquet, my executors,
administrators, and assigns, or such others as I, the said François Alphonse
Jacquet, 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 PORTABLE GAS COOKING APPAratus,” upon the con-
dition (amongst others) that I, the said François Alphonse Jacquet,
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 Offico within six calendar months next and immediately
after the date of the said Letters Patent,

page_text: NOW KNOW YE, that I, tho said François Alphonse Jacquet, do hereby
declare 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, reference being had to the accom-
panying Sheet of Drawings and to the figures and letters marked thereon,
that is to say:-
In the apparatus ordinarily employed for cooking by gas when the
pan or other cooking vessel is placed over the burner the gas flame is
caused to spread out in a smoky condition, evolving unpleasant and
unwholesome products due to imperfect combustion.
My Invention relates to a construction and arrangement of burner
apparatus whereby this defect is remedied, and the gas is more com-
pletely utilised as a heating medium.
The construction which I will describe is applicable either for cooking,
or in combination with a stove casing for heating air, and may be
arranged either singly or with two or more sets in one apparatus.
I will first describe the single burner and parts connected therewith.
It consists of an annular chamber pierced with a number of holes
through its interior periphery, and surmounted by a flat ring having a
number of radial ribs projecting from it, fixed at a little distance above
the annular chamber, these ribs serving to support the pan or other
utensil to which the heat is to be applied. From one side of the annular
chamber projects a tubular handle, by which the whole can be lifted or
moved. Through the centre of this tubular handle the gas is supplied
by a connection made by a flexible tube or otherwise with the supply
pipe, and through holes in the sides of the tubular handle air enters and
mingles with the gas. The mixture of air and gas issues by the small
holes in the inner face of the tubular chamber, and being lighted
produces a series of flame jets of high heating power, due to the complete
combustion of the gas. These flame jets are caused by the indraught of
air between the annular chamber and the flat ring above it to converge
towards the centre of the utensil placed upon the radial ribs, and having
impinged upon the vessel are spread out radially over its bottom by the
ribs on which it rests.
In order to increase the heating power a concave reflector is fixed
under the middle of the burner so as to reflect upwards on the utensil
the heat which would otherwise be radiated downwards. Two or more

page_text: such burner apparatus may be arranged in one framing, supplied with
gas and air, either, each by separate tubular handles or by a single
such tubular channel branching to the several burners; and above the
radial ribs may be fixed a flat plate or table, which may either serve as a
hot plate, or may have in it circular holes immediately above the burners,
over which holes the utensils to be heated can be placed.
In applying a burner apparatus such as has been described above for
stove heating I enclose it in a casing standing on a hollow pedestal.
This pedestal has lateral openings, through which enters the air to be
heated, and from the pedestal a tube passes upwards through the middle
of the burner, and above the burner expands in a conical form, whence
there are openings for the escape of air at or near the top of the stove
casing. The flame of the burner plays on the exterior of the conical
tube, and the products of combustion are carried by several pipes passing
through the conical tube to an exit pipe, and thence to a chimney or
other discharge; thus, the cool air entering the hollow pedestal, and
passing upwards by the conical tube, is heated in its ascent, and escapes
in a warmed condition at the upper part of the casing, while the products
of combustion are entirely separated from the air thus warmed, and are
carried off without vitiating the atmosphero of the apartment which the
stove is employed to heat.
Fig. 1 represents a section, and Fig. 2 a plan of a single burner
apparatus constructed according to my Invention.
a is an annular burner, to which gas and air are supplied through a
hollow handle c, the gas entering by a central passage & connected by a
flexible tube with a gas supply pipe, and the air entering by lateral
holes fin the handle c. The mingled gas and air issue from the ring a
by numerous holes 6 on its inner face, forming when ignited jets of great
heating power. At a little distance above the burner is fixed on studs
an annular plate g, having an external lip h, and a number of radial
ribs i, on which is set the utensil to be heated. The current of air
entoring under the plate g, as indicated by the arrows x, x, cause the
flame from the burner to converge towards the centre of tho utensil,
whence it spreads out between the annular ribs i, thus acting with great
uniformity and intensity upon the surface to be heated. The heating

page_text: power of the burner may be increased by fixing below it a concave
reflector j, a plan of which is shewn at Fig. 3.
Fig. 4 represents a longitudinal section, and Fig. 5 a plan of two
burners R, R', such as have been described above, arranged under one
plate k, upon which utensils can be placed to be heated. In this case 5
the radial ribs i are so formed that the plate k presents an even surface
for the reception of utensils. Holes are provided through the plate k
for the escape of products of combustion when the utensil placed over
the burner is of such size as to overlap the central opening. It may be
readily understood that three or more burners might be combined in 1
this manner, each having its separate gas and air supply, as shewn at
Fig. 5, or that each might be supplied by a branch from a common
supply pipe.
Fig. 4 represents a plan of a modified arrangement of the duplicate
burners. In this case the two burners R, R', are independent of the 1
plate k, each resting on its own angle brackets x. The plate k is made
with two square openings through it. The burners are supplied from
the branches of the pipe y in the manner shown to an enlarged scale at
Fig. 4b, where y is the gas branch terminating in a nozzle with a
central jet directed into the pipe of the burner, into which "pipe air 2
enters with the gas, as indicated by the arrows.
the
Fig. 6 represents a vertical section of a gas stove heated by a burner
of the kind described above; Fig. 7 is a sectional plan on the line Y, Y,
of Fig. 6; and Fig. 8 is a sectional plan on the line Z, Z. The flame of
the burner R, receiving its additional supply of air by holes a through 2
the casing of the stove, plays on the exterior of a tube m and of a
conical air chamber o, and the products of combustion pass from
interior of the stove, by pipes r carried transversely across the chamber o,
which may be connected to a chimney or other exit. Air enters a
chamber at the bottom of the stove by lateral openings, and ascends 3
through the pipe m and conical chamber o, becoming heated and issuing
into the apartment by perforations in the cover p.
Having thus described the nature of my Invention, and in what
manner the same is to be performed, I claim,-
First. The construction and arrangement substantially as herein 8
described in reference to Figs. 1 and 2 of a gas cooking apparatus,
wherein an annular tube supplied through a hollow handle with gas

page_text: mingled with air, and having a number of internal jets for flame, is
surrounded by a plate with radial ribs, on which is placed the utensil to
bo heated, and by which the flame and products of combustion are mado
to play over the surface of the utensil.
Second. The combination of a concave reflector j, with the apparatus
above referred to, for the purpose of increasing the heating power.
Third. The combination of two or more burners of the kind referred
to above in one frame, substantially as herein described in reference to
Figures 4, 5, 4, and 4°.
Fourth. The use of a gas stove constructed and operating substantially
as herein described in reference to Figs. 6, 7, and 8, wherein the
annular flame of a burner of the kind above referred to is arranged to
play upon the surface of an air chamber, the products of combustion
being completely separated from the air heated by them.
In witness whereof, I, the said François Alphonse Jacquet, have
hereunto set my hand and seal, this Sixteenth day of June, in
of our Lord One thousand eight hundred and seventy-
the year
four.
20 Witness,
ALBERT CAHEN,
Civil Engineer,
82, Boulevard Magenta,
at Paris.
F. A. JACQUET. (L.S.)