IM- PROVEMENTS IN STEAM BOILER AND OTHER FURNACES."
Year: 1853

page_text: LETTERS PATENT to Robert William Jearrad, of 17, Upper
Eccleston Place, Eccleston Square, for the Invention of "IM-
PROVEMENTS IN STEAM BOILER AND OTHER FURNACES."
PROVISIONAL SPECIFICATION left by the said Robert William
Jearrad at the Office of the Commissioners of Patents, with his
Petition, on the 5th November 1853.
I, ROBERT WILLIAM JEARRAD, of 17, Upper Eccleston Place,
Eccleston Square, do hereby declare the nature of the Invention
for IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES" to be as
follows:-
The object of this Invention is to construct steam boiler and other
furnaces in such manner as to improve the combustion of coal and to
prevent the passing off of smoke. For this purpose the interior of a
furnace is made of such a height above the fire bars as to admit of the
introduction of a horizontal partition of fire brick, tile, or other material,
which proceeds from side to side and from the front nearly to the back
of the furnace. This partition is perforated with numerous holes through
which part of the products from the fire pass, whilst others pass
through the space at the open end. Above this partition there is a
second unperforated partition of fire brick or tile, fixed at the back and

page_text: proceeding nearly to the front of the furnace; the products from
the fire pass under and then over this partition, and then away to the
flue, which passes through the boiler at a lower level than where the
heat and products go away from the fire box or furnace. I prefer that
the air for the ash-pit should be brought from an external source by a
suitable enclosed channel, and I construct suitable enclosed passages
for conducting air to and through the sides of the furnace above
the fire bars and fuel thereon, in a similar manner to what lias before.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert William Jearrad in the Great Seal
Patent Office on the 5th May 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
ROBERT WILLIAM JEARRAD, of 17, Upper Eccleston Place, Eccleston
Square, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifth day of November, in the year of
of our Lord One thousand eight hundred and fifty-three, in the seven-
teenth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Robert William Jearrad, Her special
licence that I; the said Robert William Jearrad, my executors, admi-
nistrators, and assigns, or such others as I, the said Robert William
Jearrad, 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 In-
vention for "IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES,"
upon the condition (amongst others) that I, the said Robert William
Jearrad, 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.

page_text: NOW KNOW YE, that I, the said Robert William Jearrad, 'do
hereby declare the nature of the said Invention, and in what manner
the same is to be performed, to be particularly described and ascer-
tained in and by the following statement thereof (that is to say):
The object of this Invention is to construct steam boiler and other
furnaces in such manner as to improve the combustion of coal and to
prevent the passing off of smoke. For this purpose the interior of a
furnace is made of such a height above the fire bars as to admit of the
introduction of a horizontal partition of fire brick, tile, or other
materials, which proceeds from side to side and from the front nearly
to the back of the furnace. This partition is perforated with numerous
holes through which part of the products from the fire pass, whilst
others pass through the space at the open end. Above this partition
there is a second unperforated partition of fire brick or tile, fixed at the
back and proceeding nearly to the front of the furnace; the products
from the fire pass under and then over this partition, and then away to
the flue, which passes through the boiler at a lower level than where
the heat and products go away from the fire box or furnace.
I prefer
that the air for the ash pit should be brought from an external source
by a suitable enclosed channel, and I construct suitable enclosed passages
for conducting air to and through the sides of the furnace above the
fire bars and fuel thereon, in a similar manner to what has before been
done.
Having thus described the nature of my Invention; I will proceed to
explain the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Figure 1, is a longitudinal section, and Figure 2, a transverse section
of a furnace suitable for a boiler or other use.
A, the boiler; B, tubular flue through the same; C, the flue under
the boiler; D, the third bridge, 9 inches deep, composed of approved
guaged fire bricks selected from the purest argillaceous material, set as
guaged work in putty clay, of the same material in all the three bridges;
E, the second bridge, 9 inches deep, guaged and set as above; F, the
first or take up bridge, set in compartments in guaged work, as above,
with four openings in length 2 feet each; the first, 4 inches; the second,

page_text: 3 inches; the third, 2 inches; and the fourth to be one inch respec-
tively in width. G, the furnace with two sets of bars, two feet and
four feet respectively. The first, or 2 feet long bars, set level; the
second, or 4 feet long bars, to be laid with a fall of 6 inches towards
the back, supported on proper bearing bars. H, openings on either side
of the furnace, 1 ft. 4 in. long by 6 inches deep, for the admixture of
external air with the oxides and hydrogen, in proportions proper to
their combustion. I, the ash pit with air flues, as shewn in transverse
section, to ensure a full and ample supply of air beneath the furnace
bars. All the furnace bars are three quarters of an inch wide, with
half inch openings between the same; those of two feet long are three
inches deep; the four feet long bars are 6 inches deep. The furnace
door is to be 1 feet 4 inches long or wide, by 12 inches high, and boxed
with a protection plate attached to the same, rather less than the
opening, and with a clear space of at least two inches, for the further
admission of air to be vented at the top of the box into the furnace.
There is to be an opening in the frame 2 feet long by 3 inches high,
with a regulating slide plate to govern the admission of the air. K,
three main air drains, to supply the additional air, governed by slides
or registers in the same. The smoke flues at their vents are to have
balanced weighted dampers to regulate the draught.
Having thus described the nature of my said Invention, I would
have it understood that I do not confine myself to the precise details
shewn and described; but what I claim is, the combination herein
described.
In witness whereof, I, the said Robert William Jearrad, have
hereunto set my hand and seal, this Fourth day of May,
in the year of our Lord One thousand eight hundred and
fifty-four.
Witness,
S. CARPMAEL.
ROBERT W JEARRAD. (L.S.)