CERTAIN IMPROVEMENTS IN FURNACES APPLICABLE TO BOILERS FOR GENERATING STEAM OR OTHER PURPOSES
Year: 1868

page_text: LETTERS PATENT to Thomas Jones, Joseph Jones, James Brandwood,
and John Wren, all of Manchester, in the County of Lancaster, for
the Invention of "CERTAIN IMPROVEMENTS IN FURNACES APPLICABLE TO
BOILERS FOR GENERATING STEAM OR OTHER PURPOSES."
Sealed the 12th March 1869, and dated the 17th September 1868.
PROVISIONAL SPECIFICATION left by the said Thomas Jones, Joseph
Jones, James Brandwood, and John Wren at the Office of the
Commissioners of Patents, with their Petition, on the 17th
September 1868.
We, THOMAS JONES, JOSEPH JONES, JAMES BRANDWOOD, and JoHN
WREN, all of Manchester, in the County of Lancaster, do hereby declare
the nature of the said Invention for "CERTAIN IMPROVEMENTS IN FURNACES
APPLICABLE TO BOILERS FOR GENERATING STEAM OR OTHER PURPOSES," to be as
follows:--
The Invention relates to all furnaces wherein fire-bars are used and
wherein smoke is evolved; and the improvements consist in the adap-
tation and use of hollow fire-bars terminating at the further extremity.

page_text: or back of the furnace in a chamber which is perforated and extends
upwards nearly to the top of the flue, between which and the top of such
chamber the smoke from the fire passes. The air enters the aperture
provided beneath and at the front end of the fire-bar, and passing along
the bar becomes heated, and thence passes into the chamber and out
at the perforations thereof into the flue, where it becomes mixed with
the smoke and assists in the burning or consumption thereof.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Jones, Joseph Jones, James Brandwood,
and John Wren in the Great Seal Patent Office on the 17th March
1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, WC, THOMAS
JONES, JOSEPH JONES, JAMES BRANDWOOD, and JOHN WREN, all of
Manchester, in the County of Lancaster, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventeenth day of September, in the year
of our Lord One thousand cight hundred and sixty-eight, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto us, the said Thomas Jones, Joseph Jones, James Brand-
wood, and John Wren, Her special license that we, the said Thomas
Jones, Joseph Jones, James Brandwood, & John Wren, our exc-
cutors, administrators, and assigns, or such others as we, the said
Thomas Jones, Joseph Jones, James Brandwood, and John Wren, our
executors, administrators, and assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during tho
term therein expressed, should and lawfully might make, use, exercisc,
and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "CERTAIN
IMPROVEMENTS IN FURNACES APPLICABLE TO BOILERS FOR GENERATING STEAM OR
OTHER PURPOSES," upon the condition (amongst others) that we, the said
Thomas Jones, Joseph Jones, James Brandwood, and John Wren, our
executors or administrators, by an instrument in writing under our, or
two of our, 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

page_text: 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 we, the said James Brandwood and John
Wren, 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 and accompanying
Drawings (that is to say) :-
:-
The Invention relates to all furnaces wherein fire-bars are used and
wherein smoke is evolved; and the improvements consist in the adap-
tation and use of hollow fire-bars terminating at the further extremity
or back of the furnace in a chamber which is perforated and extends
upwards nearly to the top of the flue, between which and the top of
such chamber the smoke from the fire passes. The air enters the
aperture provided beneath and at the front end of the fire-bar, and
passing along the bar becomes heated and thence passes into the
chamber and out at the perforations thereof into the flue, where it
becomes mixed with the smoke and assists in the burning or consumption
thereof.
Such being the nature and object of our said Invention for "Certain
Improvements in Furnaces applicable to Boilers for Generating Steam
or other Purposes," we will now proceed to describe more in detail the
manner in which the same is to be or may be carried into practical
effect, and in order that the same may be clearly understood we have
hereunto annexed a Sheet of Drawings illustrative thereof, and have
marked the same with figures and letters of reference corresponding with
those in the following explanation thereof.
Fig. 1 in the annexed Drawing is a vertical transverse section, and
Fig. 2 a longitudinal section of the furnace end of a double flue boiler
with our Invention shown as applied thereto; Fig. 3 is a plan or
horizontal section of the same; and Fig. 4 is a longitudinal section, and
Fig. 5 a plan view of one of our improved hollow fire-bars drawn to a
larger scale.
a, a, is the hollow fire-bar having an aperture 6 for the entrance of
the air beneath and at the front end thereof, and a second opening c
at the other extremity leading onto the perforated air chamber or
hollow bridge d, d, at the back end of the furnace and between it and
the flue e, e; f,f, is a shield or fender of cast iron placed in front of
the perforated chamber d, d, and extending about two inches nearer to

page_text: the top of the flue than the latter, so as to protect the perforated chamber
in a great measure from the intense heat of the furnace; g,g, is a swivel
door in the bottom of the perforated air chamber, which is intended
chiefly for the purpose of cleaning the same when necessary, but which
may be at times partly opened to increase the draught if required.
Having now described the nature and object of our said Invention,
together with the manner in which the same is to be or may be performed
or carried into practical effect, we wish it to be distinctly understood
that we claim as our Invention the use or employment of hollow fire-
bars in connection with a perforated air chamber or hollow bridge pro-
tected by a shield or fender, substantially as shown in the Drawings
hereunto annexed and above more particularly described.
In witness whereof, we, the said James Brandwood and John Wren,
on behalf of ourselves and the said Thomas Jones and Joseph
Jones, have hereunto set our hands and seals, this Sixteenth
day of March, in the year of our Lord One thousand eight hundred
and sixty-nine.
Witness,
GEORGE DAVIES, C.E.,
Office for Patents,
Manchester.
JAMES BRANDWOOD. (L.S.)
JOHN WREN.
(L.S.)