IMPROVE- MENTS IN THE CONSTRUCTION OF FURNACES FOR THE PURPOSE OF CONSUMING MORE EFFECTUALLY THAN HEREMPADE THE QUA
Year: 1855

page_text: LETTERS PATENT to James Wright, of 16, Park Street, Kennington, in
the County of Surrey, Oven Builder, for the Invention of "IMPROVE-
MENTS IN THE CONSTRUCTION OF FURNACES FOR THE PURPOSE OF CONSUMING
MORE EFFECTUALLY THAN HEREMPADE THE QUA
PROVISIONAL SPECIFICATION left by the said James Wright at the
Office of the Commissioners of Patents, with his Petition, on the
17th February 1855.
I, JAMES WRIGHT, of 16, Park Street, Kennington, in the County of
Surrey, Oven Builder, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES FOR THE PURPOSE OF
CONSUMING MORE EFFECTUALLY THAN HERETOFORE THE SMOKE CONTAINED THEREIN,"
to be as follows:-
This Invention consists in the use and adaptation to furnaces of a sus-
pended "bridge" placed at the under side of a boiler or other vessel,
immediately over the furnace bars, and at a suitable distance therefrom; and
this Invention is designed for the purpose of compelling the smoke from the.
"green"
coal to be deflected or thrown down by the said bridge, and thereby
causing the smoke to pass over the clear part of the fire, and be consumed.
thereby more perfectly than heretofore.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Wright in the Great Seal Patent Office on the
17th August 1855.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
WRIGHT, of 16, Park Street, Kennington, in the County of Surrey, Oven
Builder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventeenth day of February, in the year of our Lord
One thousand eight hundred and fifty-five, in the eighteenth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said James Wright, Her special licence that I, the said James
Wright, my executors, administrators, and assigns, or such others as I, the
said James Wright, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "In-
PROVEMENTS IN THE CONSTRUCTION OF FURNACES FOR THE PURPOSE OF CONSUMING
MORE EFFECTUALLY THAN HERETOFORE THE SMOKE CONTAINED THEREIN," upon the
condition (amongst others) that I, the said James Wright, by an instrument
in writing under my hand and seal, 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 James Wright, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
My Invention consists in the use and adaptation to furnaces generally of a
suspended "bridge" placed at the under side of a boiler or other vessel, imme-
diately over the furnace bars and at a suitable distance therefrom; my Inven-
tion being designed for the purpose of compelling the smoke given off from
'green coal," to be deflected or thrown down by the said bridge, and by these
means to cause the smoke to pass over the clear part of the fire and be con-
sumed thereby more perfectly than heretofore.
65
I would remark that I am aware that suspended or hanging bridges have

page_text: before been proposed to be used in furnaces, but not in such manner as to
obtain any considerable beneficial result as regards the consumption of the
smoke therein. My Invention, therefore, consists in the use and adaptation to
furnaces of a suspended or hanging bridge when applied thereto, in the manner
herein-after particularly described and set forth. And in order to explain my
said Invention as completely as possible, I now proceed to describe the best
means I am acquainted with for carrying the same into practical effect,
reference being had to the illustrative Drawing hereunto annexed, and to the
numeral figures and letters of reference marked thereon respectively, as
Figure 1 is a longitudinal and vertical section of a furnace, and portion of
an ordinary steam boiler for generating steam, shewing the application of a
suspended or hanging bridge thereto. Figure 2 is a transverse and vertical
section through the line A, B, at Figure 1. At each of the foregoing Figures
I employ similar letters of reference to denote corresponding parts, in so far as
such parts appear or can be seen at each of the Figures respectively. A, A, is
a suspended or hanging bridge, which may be of iron or fire brick, either
hollow or solid, and if necessary perforated as heretofore. B, furnace bars;
C, bearers; D, dead plate; E, the back bridge; F, furnace door, all of the
ordinary kind; G, portion of a steam boiler. In adapting the suspended
or hanging bridge A, A, to the under side of the boiler and brickwork of the
furnace, I have found the most beneficial results to be obtained for effecting con-
sumption of the smoke when the bridge A is placed at a distance equal to about
one-third of the entire length of the fire bars from the face of the back bridge
E, and at a distance of from eight to ten inches from the surface of the fire bars
to the under side of the hanging bridge A, according to the size of the furnace,
care being taken by the stoker in "firing" to keep a clear space of at least
inches between the surface of the fuel upon the furnace bars and the under
side of the bridge A, for the passage of smoke from the green coal which is
upon that part of the bars in front of the aforesaid hanging bridge. I would
here remark, that although the mode above set forth and described of arrang-
ing and disposing the hanging bridge A, with respect to the back bridge E and
surface of the furnace bars B, I have found to answer well in practise, at the
same time it is important to the proper action of the furnace and consumption
of the smoke that the firing should be conducted with ordinary care; and
although I have described and represented a hanging bridge as applied to
a steam boiler only, it will appear obvious that the above mode of applying a

page_text: hanging bridge is equally applicable to any other description of vessels, such as
stills, sugar pans, and such like vessels.
Having now described the nature and object of my said Invention of
"Improvements in the Construction of Furnaces for the Purpose of Con-
suming more effectually than heretofore the Smoke contained therein," and in
what manner the same is to be and may be performed, I would remark in
conclusion that I claim as my Invention the mode above particularly described,
set forth, and represented, of arranging and disposing the suspended or hang-
ing bridge A with respect to the back bridge E and surface of the fire bars B,
for the purpose of effecting more perfect consumption of the smoke in furnaces
than heretofore.
In witness whereof, I, the said James Wright, have hereunto set my
hand and seal, this Seventeenth day of August, in the year of our
Lord One thousand eight hundred and fifty-five.
Witness,
ALEXT PRINCE,
4, Trafalgar Square, Charing Cross.
JAMES WRIGHT. (L.S.)