A HOT AIR STOVE WITH DUPLEX PIPES
Year: 1874

page_text: LETTERS PATENT to Louis Duport, of Lyons, in the Department of
the Rhône, and Republic of France, Manufacturer, for the Inven-
ઃઃ
tion of "A HOT AIR STOVE WITH DUPLEX PIPES.”·
Sealed the 15th December 1874, and dated the 20th June 1874.
PROVISIONAL SPECIFICATION left by the said Louis Duport at the
Office of the Commissioners of Patents, with his Petition, on the
20th June 1874.
I, LOUIS DUPORT, of Lyons, in the Department of the Rhône, and
Republic of France, Manufacturer, do hereby declare the nature of the
said Invention for "A HOT. AIR STOVE WITH DUPLEX PIPES," to be as
follows:-
My improved hot air stove will be best understood by reference to.
the accompanying Sheet of Drawing, Figure 1 representing it in vertical
section at A, B, and C, D, Fig. 2, and Figure 2 in horizontal section at:
E, F, and G, H, Fig. 1, a indicating the fire-place surrounded with
fire-bricks; b, sheet-non cylinder enclosing the fire-place and ash-box;
c, ash-box; f, f, small pipes of sheet iron of one piece rolled upon >

page_text: itself into a double or duplex pipe to increase the leating surface;
g, radii or partitions of sheet iron communicating the heat of the
cylinder 6 to the rolled pipes f,f, and to the sheet-iron casing i; d, d',
du, d¹¹¹, conduit pipes of the burnt gases; e, sheet-iron top of cylinder;
1, pipe furnished with a key, and which is covered when starting the
fire, the chimney sometimes requiring to be heated; i, sheet-iron
casing around the rolled pipes or small double pipes of cylinder b;
jjjj, sweeping or cleansing pipes.
Rays of heat pass through air without heating it; air heating only
by contact with hot bodies and by the transmission of heat gradually.
To multiply the heating surfaces (which is the object of my Inven-
tion) I arrange around the cylinder 6 between the sheet-iron radii or
partitions g, and surrounding the pipes; d, d', d¹¹, d, sheets of iron
rolled upon themselves forming the double or duplex pipes ff; these
double pipes are united (if necessary by rivets) at one point of their
circumference to the cylinder b, and at another with the partitions g.
The developement aud the heating surfaces of all these pipes are not.
fixed, they vary with the quantity of fuel to be burnt and the cubic
yards of air to be heated.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Louis Duport in the Great Seal Patent Office on
the 19th December 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, LOUIS
DUPORT, of Lyons, in the Department of the Rhône, and Republic of
France, Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of Junc, in the year
of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Louis Duport, Her
special license that I, the said Louis Duport, my executors, adminis-
trators, and assigns, or such others as I, the said Louis Duport, my
executors, administrators, and assigns, should at any time agree with,

page_text: exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "A
HOT AIR STOVE WITH DUPLEX PIPES," upon the condition (amongst others)
that I, the said Louis Duport, 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.
NOW KNOW YE, that I, the said Louis Duport, do hereby declare
the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described in and by the following
statement:-
My improved hot air stove will be best understood by reference to
the accompanying Sheet of Drawing, Figure 1 representing it in vertical
section at A, B, and C, D, Figure 2, which is a horizontal section at
E, F, and G, H, Figure 1, a indicating the fire-place surrounded with
fire-bricks; b, sheet-iron cylinder enclosing the fire-place and ash-box;
c, ash-box; f, f, small pipes of sheet iron of one piece rolled upon
itself into a double or duplex pipe to increase the heating surface;
.g, radii or partitions of sheet iron communicating the heat of the
cylinder to the rolled pipes f, f, and to the sheet-iron casing i;
d, d', d, conduit pipes of the burnt gases; e, sheet-iron top of
cylinder b; h, pipe furnished with a key, and which is covered when
starting the fire, the chimney requiring sometimes to be heated; i, sheet-
iron casing around the rolled pipes or small double pipes of cylinder b;
jjjj, sweeping or cleaning pipes; k, hot air space between stove and
casing; l, m, n, air inlet and outlet passages; o, grate or fire-bars.
Rays of heat pass through air without heating it, air heating only by
contact with hot bodies and by the transmission of lieat gradually from
one to another.
To multiply the heating surfaces (which is the object of my Inven-
tion) I arrange around the cylinder between the sheet-iron radii or
partitions and surrounding the pipes; d, d', d", sheets of iron rolled

page_text: upon themselves forming the double or duplex pipes f,f; these double
pipes are united (if necessary by rivets) at one point of their circum-
ference to the cylinders b, d, d¹, d¹¹, and at another with the partitions g.
The developement and the heating surfaces of all these pipes are not
fixed, they vary with the quantity of fuel to be burnt and the cubic
yards of air to be heated.
In witness whereof, I, the said Louis Duport, have hereunto set
my hand and seals, this Fourteenth day of December, in the
year of our Lord One thousand eight hundred and seventy-
four.