NEW OR IMPROVED APPARATUS FOR THE PREVENTING OR DIMINISHING " PROAL SPECIFICATION IN STEAM BOILER AND OTHER FUCES
Year: 1874

page_text: LETTERS PATENT to William Darlaston, of Aston, near Birmingham,
in the County of Warwick, Machinist, and William Hawkins, of
Brierley Hill, in the County of Stafford, Auctioneer, for the Inven-
tion of "NEW OR IMPROVED APPARATUS FOR THE PREVENTING OR DIMINISHING
"
PROVISIONAL SPECIFICATION left by the said William Darlaston
and William Hawkins at the Office of the Commissioners of
Patents, with their Petition, on the 25th September 1874.
We, WILLIAM DARLASTON, of Aston, near Birmingham, in the County
of Warwick, Machinist, and WILLIAM HAWKINS, of Brierley Hill, in
the County of Stafford, Auctioneer, do hereby declare the nature of the
said Invention for "NEW OR IMPROVED APPARATUS FOR THE PREVENTING OR
DIMINISHING OF SMOKE IN STEAM BOILER AND OTHER FURNACES," to be as
follows:-
Our Invention has for its object to effect a more perfect combustion
of the fuel in the furnaces of steam boilers and in other furnaces, such
for example, as the furnaces of stoves and muffles.

page_text: We do not limit the application of our Invention to any particular
kinds of furnaces.
Our said Invention consists in constructing in the following manner
that part of the furnace called the "dead plate."-We form in the said
dead plate one or more oblong openings, the longer sides of the said t
opening or openings being parallel with and at a short distance from the
furnace door. The said opening or openings extend, by preference, from
one-half to three-fourths of the length of the dead plate. At the rear or
distant side of the said opening or openings is a plate inclining from the
back to the front of the said opening or openings, and making an angle 1
of twenty or thirty degrees with the plane of the dead plate. Tri-
angular vertical plates at the ends of the opening or openings connect
the inclined plate at its ends with the horizontal part of the dead plate.
By the arrangement of parts described a current of air from the ash-
pit rises through the opening or openings in the dead plate, which 1
current of air is deflected by the inclined plate described towards the
mouth of the furnace. By giving this direction to the current of air as
it enters the furnace it becomes effectually mingled with the inflammable
gases and vapours volatilized from the coal, and they are burned without
the production of smoke or with the production of only a small quantity 2
of smoke.
Dead plates having the arrangement of parts constituting our Inven.
SPECIFICATION in pursuance of the conditions of the Letters Patent, 25
filed by the said William Darlaston and William Hawkins in the
Great Seal Patent Office on the 17th March 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
DARLASTON, of Aston, near Birmingham, in the County of Warwick,
Machinist, and WILLIAM HAWKINS, of Brierley Hill, in the County of 30
Stafford, Auctioneer, send greeting.

page_text: 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 suc-
cessors, give and grant unto us, the said William Darlaston and
William Hawkins, Her special license that we, the said William
Darlaston and William Hawkins, our executors, administrators, and
assigns, or such others as we, the said William Darlaston and William
Hawkins, our executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and 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
"NEW OR IMPROVED APPARATUS FOR THE PREVENTING OR DIMINISHING OF SMOKE
IN STEAM BOILER AND OTHER FURNACES," upon the condition (amongst
others) that we, the said William Darlaston and William Hawkins, our
executors or administrators, by an instrument in writing under our or
their hands and seals, or under the hand and seal of one of us or them,
should particularly describe and ascertain the nature of the said Inven-
tion, 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 we, the said William Darlaston and William
Hawkins, 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 thereof,
that is to say:-
Our Invention has for its object to effect a more perfect combustion
of the fuel in the furnaces of steam boilers and in other furnaces, such
for example, as the furnaces of stoves and muffles.
We do not limit the application of our Invention to any particular
kinds of furnaces.
Our said Invention consists in constructing in the following manner
that part of the furnace called the "dead plate:"-We form in the said
dead plate one or more oblong openings, the longer sides of the said
opening or openings being parallel with and at a short distance from the
furnace door. The said opening or openings extend, by preference,
from one-half to three-fourths of the length of the dead plate. At the -

page_text: rear or distant side of the said opening or openings is a plate inclining
from the back to the front of the said opening or openings, and making
an angle of twenty or thirty degrees with the plane of the dead plate.
Triangular vertical plates at the ends of the opening or openings connect
the inclined plate at its ends with the horizontal part of the dead
plate.
By the arrangement of parts described a current of air from the ash-
pit rises through the opening or openings in the dead plate, which
current of air is deflected by the inclined plate described towards the
mouth of the furnace. By giving this direction to the current of air as
it enters the furnace it becomes effectually mingled with the inflammable
gases and vapours volatilized from the coal, and they are burned without
the production or with the production of only a small quantity of
smoke.
Dead plates having the arrangement of parts constituting our Inven- 1
tion may be made by the process of casting, and are but little if at all
more costly than dead plates of the ordinary kind.
Having explained the nature of our Invention we will proceed to
describe with reference to the accompanying Drawing, the manner in
which the same may be performed.
Figure 1 represents in longitudinal section the furnace and furnace end
of an egg-ended steam boiler, to which furnace a dead plate constructed
according to our Invention is applied, and Figure 2 represents in longitu-
dinal section the furnace and furnace end of a Cornish or flue boiler, to
which furnace a dead plate constructed according to our Invention is 2
applied.
Figures 3, 4, and 5, represent the dead plate detached drawn one-
fourth the full size, Figure 3 representing a front elevation of the
improved dead plate, Figure 4, a plan of the same, and Figure 5, a cross
section of the same.
The same letters of reference indicate the same parts in the several
Figures of the Drawing.
3
a, a, is the dead plate of the furnace, the ends of which when applied
to the boiler furnace, Figure 1, are built in the brickwork of the said
furnace, and when applied to the boiler furnace Figure 2 are supported 3
in any convenient way on the front or sides of the internal flue of the
furnace, the lip or horizontal rear part 6 supporting the fore ends of the

page_text: In applying our Invention to the furnaces of stoves and muffles and
to other furnaces; we construct and apply the dead plate, substantially
in the manner herein-before described with respect to its application to
the furnaces of steam boilers.
: Having now described the nature of our Invention and the manner in
which the same is to be performed, we wish it to be understood that we
claim as our Invention the new or improved apparatus for the preventing
or diminishing of smoke in steam boiler and other furnaces herein-
before described and illustrated in the accompanying Drawing, that is
to say, constructing in the dead plate of the said furnaces one or
more openings, and arranging over the said opening or openings an
inclined plate or air deflector. for the purposes and substantially as
herein-before described and illustrated.
"In witness whereof, we, the said William Darlaston and William
Hawkins, have hereunto set our hands and seals, this Sixteenth
day of March, in the year of our Lord One thousand eight
hundred and seventy-five.
WILLIAM DARLASTON. (L.S.)
WILLIAM HAWKINS.
(L.S.)
Witness,
RICHARD SKERRETT,
Clerk to George Shaw,
Birmingham.