IMPROVEMENTS IN OR ADDITIONS TO FURNACES
Year: 1855

page_text: LETTERS PATENT to John Lobb Jeffree, of Blackwall, in the County of
Middlesex, Engineer, for the Invention of "IMPROVEMENTS IN OR ADDITIONS
TO FURNACES."
Sealed the 10th June 1856, and dated the 17th December 1855.
PROVISIONAL SPECIFICATION left by the said John Lobb Jeffree,
at the Office of the Commissioners of Patents, with his Petition, on the
17th. December 1855.
I, JOHN LOBB JEFFREE, of Blackwall, in the County of Middlesex, Engineer,
do hereby declare, the nature of the said Invention for "IMPROVEMENTS, IN OR
ADDITIONS TO FURNACES" to be as follows:-
My Invention consists in placing in the smoke way behind the bridge in
furnaces with bridges, and in the fire box at the back of tubular marine
furnaces, hollow flattened pipes open at top through one, two, or more slots,
and communicating either directly or through suitable air flues or passages with
the atmosphere. These pipes, becoming hot, heat the smoke outside of them
and the air passing through them, and the heated smoke and air coming in
contact, become converted into flame, and thus combustion is rendered as
perfect as may be, and smoke is prevented from issuing from the furnace,
chimney, or shaft.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Lobb Jeffree in the Great Seal Patent Office on the
17th June 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN LOBB
JEFFREE, of Blackwall, in the County of Middlesex, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventeenth day of December, in the year of our Lord
One thousand eight hundred and fifty-five, in the nineteenth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
John Lobb Jeffree, Her special licence that I, the said John Lobb Jeffree,
my executors, administrators, and assigns, or such others as I, the said John
Lobb Jeffree, 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 OR
ADDITIONS TO FURNACES," upon the condition (amongst others) that I, the said
John Lobb Jeffree, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should parti-
cularly 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 John Lobb Jeffree, 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 thereof, reference being had to the Drawings hereunto annexed,
that is to say:-
My Invention consists in placing in the smoke way behind the bridge in
furnaces (with bridges), and in the fire box at the back of tubular marine
furnaces, hollow flattened pipes open at top or at the side, or both at top and
at the side, through one, two, or more slots or openings, and communicating
either directly or through suitable air flues or passages with the atmosphere.
These pipes, becoming hot, heat the smoke outside of them and the air passing
through them, and the heated smoke and air coming in contact, become con-
verted into flame, and thus combustion is rendered as perfect as may be, and
smoke is prevented from issuing from the furnace, chimney, or shaft.

page_text: .
Figure 1 of the Drawings annexed, is a sectional elevation of a tubular
marine boiler, with two furnaces to which my Invention is applied; Figure 2
is a back view of the same, with part of the casing removed to shew the
internal arrangement. A, A, are the furnaces; B, B, boiler tubes; C, C, fire
bars; D, uptake; E is an air chamber, formed at the back of the boiler
between the furnaces and above the fire bars, communicating with the external
atmosphere through the opening F, cut in the fire box and outer shell of the
boiler. This opening may be closed when desired by the sliding door or
register G. H, H, H, are hollow flattened pipes, opening into the sides of
the chamber E. In the Figure each furnace is represented as having four
such pipes, but a greater or less number may be employed. These pipes are
formed with slots or openings near the top, and are fixed at their further ends
on T pieces fitted on the fire box. I is the ash-pit; i, ash-pit door; J, water
space. When the fire is lighted, the draught from the chimney drives the
smoke and products of combustion towards and between and around the pipes
H, H, which, becoming hot, heat the smoke and products of combustion,
as well as the air entering through them, and the heated smoke and air
coming in contact, become almost wholly converted into flame.
Figure 3 is a sectional elevation, and Figure 4 a transverse section, of the
furnace of a stationary or marine boiler to which my Invention is applied.
A, A, is the furnace; B, the boiler; C, C, fire bars; D, D, the flattened pipes
which are carried across the back of the furnace, and are open to the
atmosphere, as shewn at d, d, at the side of the furnace; e is a diaphragm,
which assists in guiding the products of combustion around and between the
pipes D, D. The arrows indicate the passage of the air.
Figure 5 is a transverse section of an ordinary boiler on a furnace having
a bridge. A is the furnace; B, boiler; C, fire bars; D, bridge; E, ash-pit;
F, F, are hollow flattened pipes behind the bridge, supplied with air through
a flue G, which passes along the ash-pit, and opens out into the atmosphere.
Figure 6 is an elevation, and Figure 7 a section, of a flattened pipe used
for the purposes of my Invention. a, a, are slots in the sides of the pipe
for the escape of air among the products of combustion.
Figure 8 is an elevation, and Figure 9 a section, of another description
of pipe, slightly differing in configuration from the preceding. a, a, slots or
openings, as before.
Figure 10 is a side elevation, and Figure 11 a section, of a modification of
pipe, in which, instead of longitudinal slots, round orifices a, a, are provided
for the escape of air among the products of combustion.

page_text: Figure 12 is a transverse section of another modification of flattened pipe,
in which there are two apertures or slots a, b, for the escape of the air.
And having now described the nature of the said Invention, and in what
manner the same may be performed, I declare that I claim the employment
in furnaces of hollow tubes or pipes with apertures therein, and communicating
with the atmosphere, for heating the air entering through them and the smoke
and other products of combustion, for the purpose and in manner herein-before
described with reference to the Drawings hereunto annexed.
In witness whereof, I, the said John Lobb Jeffree, have hereunto set
my hand and seal, this Seventeenth day of June, One thousand eight
hundred and fifty-six.
JOHN LOBB JEFFREE. (L.S)
JOHN LOBB JEFFREE. (L.S)