A HOT-AIR APPARATUS IN CAST IRON OR ANY OTHER METAL OR SUB-. STANCE, CONSISTING OF PRISMATIC TUBES, TO BE APPLIED TO CHIMNIES WITH FLUES AND HEAT CONDUITS
Year: 1862

page_text: of "A HOT-AIR APPARATUS IN CAST IRON OR ANY OTHER METAL OR SUB-.
STANCE, CONSISTING OF PRISMATIC TUBES, TO BE APPLIED TO CHIMNIES WITH
FLUES AND HEAT CONDUITS." -A communication from abroad by Jean
Baptist Fondet, of 14bis, Boulevart Poissoniére, Paris, in the Empire
of France, Architect.
PROVISIONAL SPECIFICATION left by the said Gabriel Lewal at the
Office of the Commissioners of Patents, with his Petition, on the 4th
December 1862.
I, GABRIEL LEWAL, of No. 74, Saint George's Road, Pimlico, in the County
of Middlesex, Gentleman, do hereby declare the nature of the said Invention
for "A HOT-AIR APPARATUS IN CAST IRON OR ANY OTHER METAL OR SUBSTANCE,
CONSISTING OF PRISMATIC TUBES, TO BE APPLIED TO CHIMNIES WITH FLUES AND HEAT
CONDUITS," to be as follows:-
The apparatus consists of a box; in the bottom or lower side there is a hole>

page_text: to communicate with the external air, and in the top or upper side there is a
grating pierced with three or more ranges of square holes diagonally, and to
each of these holes is adapted a vertical tube, all communicating with a
cylinder placed parallel with the box. The cylinder communicates with the
apartment either by having the ends open, or else by extra pipes, so as to
make the openings into the apartment wherever it is desired, but which
openings should be on a higher level than the cylinder. The apparatus thus
constructed is placed in the inside of the chimney over an air hole made to
communicate with the external air by means of a pipe, flue, or any other means,
so that the hole in the bottom of the box corresponds with the said air hole.
The apparatus is placed in the chimney slantingly, so that the bottom should
be at about a foot and the top at about two inches from the front of the stove
or grate, & would replace the backs now in use of such stoves or grates.
The principle of the Invention is to divide the heat produced by combustion
and make it work round the tubes, and thus increase the heating surface so
as to utilize the whole heat produced. by the fire; therefore there should be
several tubes, although the number is a matter to be determined by the size
of the chimney; the section of the tubes should not be less than a square with
a quarter of an inch on each side.
I prefer the apparatus to be made of cast iron, as being the cheapest and
most durable, but it may be made of any other substance calculated to resist
heat
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Gabriel Lewal in the Great Seal Patent Office on the
18th May 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GABRIEL
LEWAL, of No. 74, Saint George's Road, Pimlico, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of December, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-sixth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Gabriel Lewal, Her special licence, that I, the said Gabriel
Lewal, my executors, administrators, and assigns, or such others as I, the

page_text: said Gabriel Lewal, 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, exer-
cise, and vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "A HOT-AIR APPARATUS
IN CAST IRON OR ANY OTHER METAL OR SUBSTANCE, CONSISTING OF PRISMATIC TUBES,
TO BE APPLIED TO CHIMNIES WITH FLUES OR HEAT CONDUITS," upon the condition
(amongst others) that I, the said Gabriel Lewal, my executors or adminis-
trators, 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.
NOW KNOW YE, that I, the said Gabriel Lewal, do hereby declare
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:--
.
The apparatus consists of a box; in the bottom or lower side there is a hole
to communicate with the external air, and in the top or upper side there is a
grating pierced with three or more ranges of square holes diagonally, and to
each of these holes is adapted a vertical tube, all communicating with a
cylinder placed parallel with the box. The cylinder communicates with the
apartment either by having the ends open or else by extra pipes, so as to
make the openings into the apartment wherever it is desired, but which
openings should be on a higher leval than the cylinder. The apparatus thus
constructed is placed in the inside of the chimney over an air hole made to
communicate with the external air by means of a pipe, flue, or any other means,
so that the hole in the bottom of the box corresponds with the said air hole.
The apparatus is placed in the chimney slantingly, so that the bottom should.
be at about a foot, and the top about three inches from the front of the stove
or grate, and would replace the backs now in use of such stoves or grates.
The principle of the Invention is to divide the heat produced by combustion
and make it work round the tubes, and thus increase the heating surface, so as
to utilize the whole heat produced by the fire. Therefore there should be
several tubes although the number is a matter to be determined by the size of
the chimney. The section of the tubes should not be less than a square with
a quarter of an inch on each side.
I prefer the apparatus to be made of cast iron, as being the cheapest and

page_text: most durable, but it may be made of any other substance calculated to resist
heat.
This apparatus will serve to ventilate as well as to heat a room.
In witness whereof, I, the said Gabriel Lewal, have hereunto set my
hand and seal, this Fifteenth day of May, in the year of our Lord
One thousand eight hundred and sixty-three.
Signed and sealed by the within-
named Gabriel Lewal, in the
presence of
THO. GIBSON BREWER,
Solicitor,
5, Philpot Lane, City,
Agent in the matter of this Patent.
(L.)