IMPROVEMENTS IN GAS STOVES
Year: 1874

page_text: LETTERS PATENT to William Harrold, of West Bromwich, in the
County of Stafford, Brass and Iron Founder, for the Invention of
"IMPROVEMENTS IN GAS STOVES."
Sealed the 13th May 1875, and dated the 24th November 1874.
PROVISIONAL SPECIFICATION left by the said William Harrold at the
Office of the Commissioners of Patents, with his Petition, on the
24th November 1874.
I, WILLIAM HARROLD, of West Bromwich, in the County of Stafford,
Brass and Iron Founder, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN GAS STOVES," to be as follows:-
The object of this Invention is by the means herein-after described to
obtain a much greater heating surface than can be obtained from gas
stoves as generally constructed, and to promote a thorough circulation
of air through the stove as it becomes heated, and this without con-
taminating the air so heated, which is allowed to mix with and form part
of the atmospheric air of the room in which the stove is employed, as
herein-after explained.

page_text: I first provide a circular casing of copper or other suitable metal,
which is closed at the top, but having a small aperture in its centre, to
which is attached the flue or pipe employed for carrying off the noxious
air evolved by the combustion of gas, and round the said opening in the
top plate and extending in a vertical direction to a convenient distance
below the bottom of the said metal casing a suitable number of tubes
The
are placed, these being secured in position in any suitable manner.
said metal casing is in its turn placed within an outer casing, also of
metal, which is enclosed at its top, but is so constructed as to leave a
certain space below its said top and the open ends of the upper parts of
the said vertical tubes, the said outer casing being also so constructed
at its bottom or lower part that a suitable space is provided for the
atmospheric air to pass in and ascend through the said vertical tubes.
The jets, which may be of any suitable kind, are placed within
the said inner casing a short distance above the level of its bottom
part.
"
When the stove is in operation the impure air evolved by the com-
bustion of gas passes away through the flue or waste pipe, provided as
herein-before explained, and the vertical tubes becoming heated the
outer or atmospheric air circulates through them without coming into
contact with the gas flame, and the air contained between the said two
casings also becomes heated, and the heated air thus created being of
pure quality is allowed to escape and mix with the outer air of the room
in which the gas stove is in operation by means of small openings pro-
vided at the top of the said outer casing.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
.
filed by the said William Harrold in the Great Seal Patent Office
on the 24th May 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HARROLD, of West Bromwich, in the County of Stafford, Brass and Iron: 30
Founder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of November, in the
year of our Lord One thousand eight hundred and seventy-four, in the

page_text: thirty-eighth year of her reign, did, for Herself, Her heirs and successors,:
give and grant unto me, the said William Harrold, Her special licence:
that I, the said William Harrold, my exccutors, administrators, and
assigns, or such others as I, the said William Harrold, 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, usc, exercise; and
vend, within the United Kingdom of Great Britain and Ireland, tho
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
Gas Stoves,” upon the condition (amongst others) that I, the said William,
Harrold, my executors or administrators, by an instrument in writing,
under my, or their, or one of their hands and scals, 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 William Harrold, do hereby declarq
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement (that is to say) -
.!
The object of this Invention is by the means herein-after described to
obtain a much greater heating surface than can be obtained from gas
stoves as generally constructed, and to promote a thorough circulation
of air through the stove as it becomes heated, and this without con-
taminating the air so heated, which is allowed to mix with and form part
of the atmospheric air of the room in which the stove is employed, as
herein-after explained.
I first provide a circular casing of copper or other suitable metal,
which is closed at the top, but having a small aperture in its centre, to
which is attached the flue or pipe employed for carrying off the noxious
air evolved by the combustion of gas, and round the said opening in the
top plate, and extending in a vertical direction to a.convenient distance.
below the bottom of the said metal casing, a suitable number of tubes
are placed, these being secured in position in any suitable manner.
said metal casing is in its turn placed within an outer casing, also of
metal, which is enclosed at its top, but is so constructed as to leave a
certain space.below its said top..and the open ends of the upper parts of
the said vertical tubes, the said outer casing being also so constructed.
The.

page_text: Having now described the nature of my Invention, and the manner
in which the same may be carried into effect, I desire it to be understood
that I do not limit myself to the precise details thereof, which may be
varied or modified without departing from the nature of my said In-
vention; for instance, the casing may be either circular, square, or oblong
in shape; the number and size of the vertical tubes may be varied; or
instead of the said tubes being placed in a directly vertical position they
may be placed at any convenient angle, and any suitable description of
gas burner may be employed; but what I claim to be protected by the
herein-before in part recited Letters Patent is, the combination in gas
stoves of casings, lieating tubes (placed vertically or otherwise, as before
mentioned), and exit flue, substantially as hicrein-before described and
illustrated in the accompanying Drawings.
In witness whereof, I, the said William Harrold, have hereunto
set my hand and seal, this Twentieth day of May, in the year of
our Lord One thousand eight hundred and seventy-five.
WILLIAM HARROLD. (L.S.)