IMPROVEMENTS IN THE CON- STRUCTION OF FIRE-BARS FOR FURNACES
Year: 1874

page_text: LETTERS PATENT to Thomas Arnold, of Edgeley, Stockport, in the
County of Chester, for the Invention of "IMPROVEMENTS IN THE CON-
STRUCTION OF FIRE-BARS FOR FURNACES."
Sealed the 11th September 1874, and dated the 16th March 1874.
PROVISIONAL SPECIFICATION left by the said Thomas Arnold at the
Office of the Commissioners of Patents, with his Petition, on the
16th March 1874.
I, THOMAS ARNOLD, of Edgeley, Stockport, in the County of Chester,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF FIRE-BARS FOR FURNACES," to be as follows:-
This Invention is applicable principally to the furnaces of what are
well known as Cornish boilers having an internal fluc or flues, in one
end of which the fire-bars are fixed.
Each fire-bar consists of two longitudinal side plates connected
together at close intervals by transverse webs at right angles to the side
plates, the whole being cast in one piece; and I place these fire-bars

page_text: transversely to the flue or furnace and support their ends on longitudinal
bearers, which are themselves carried by transverse bars or bearers fitted
in the fluc or furnace.
The transverse webs are rather deeper than the side plates so that
they project below the latter and form channels or guides for the air to
enter. Their upper surface is level with that of the side plates, and
they are grooved in such a way that when they are placed in the flue or
furnace the grooves run longitudinally of the furnace.
Small webs or projections are cast upon the side plates to keep the
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Arnold in the Great Seal Patent Office
on the 15th September 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
ARNOLD, of Edgeley, Stockport, in the County of Chester, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of March, in the year
of our Lord One thousand cight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Thomas Arnold, Her special licence
that I, the said Thomas Arnold, my executors, administrators, and
assigns, or such others as I, the said Thomas Arnold, 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
THE CONSTRUCTION OF FIRE-BARS FOR FURNACES," upon the condition (amongst
others) that I, the said Thomas Arnold, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands
and scals, 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 Scal Patent Office within six

page_text: Patent.
NOW KNOW YE, that I, the said Thomas Arnold, 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):--
This Invention is applicable principally to the furnaces of what arc
well known as Cornish boilers, having an internal flue or flues, in one
end of which the fire-bars are fixed.
Each fire-bar consists of two longitudinal side plates connected
together at close intervals by transverse webs at right angles to the side
plates, the whole being cast in one piece; and I place these fire-bars
transversely to the flue or furnace and support their ends on longitudinal
bearers, which are themselves carried by transverse bars or bearers in
the flue or furnace.
Such being the nature and object of the said Invention I will now
proceed to describe more in detail the manner in which the same is to be
or may be performed or carried into practical effect; and in order that the
same may be clearly understood I have annexed hereunto 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 :-
In the annexed Drawing Fig. 1 is a plan view; Fig. 2, a side
elevation; Fig. 3, a longitudinal section; and Fig. 4, a transverse
section of a fire-bar made according to my Invention.
The improved fire-bar consists of two longitudinal side plate, a, a,
connected together at close intervals by transverse webs b, b, at right
angles to the side plate (the whole being cast in one piece, as above
described) leaving a number of spaces or passages c, c, between the
webs for the passage of air to the furnace.
The transverse webs b, b, are rather deeper than the side plates a, a,
so that they project below the latter and form channels or guides to
arrest the air and guide it upwards so as to cause it to enter the furnace
through each space. Their upper surface is level with that of the side
plates and may be cither plain or grooved in such a way that when they.

page_text: are placed in the flue or furnace the grooves run longitudinally of the
furnace.
Small snugs or projections d, d, are cast upon the sides of the
plates a, a, to keep the bars apart and allow of the passage of air
between them.
.-
Having now described the nature and object of my said Invention,
together with the manner in which the same is to be or may be
performed or carried into practical effect, I wish it to be understood that
I claim as my Invention the improved construction of fire-bar for
furnaces, as herein-before described and illustrated by the Drawing
annexed, consisting of two side plates connected together by a series of
transverse webs all cast in one piece, such webs projecting below the
side plates.
And, Secondly. I claim mounting such fire-bars transversely to the
flue or furnace.
In witness whereof, I, the said Thomas Arnold, have hereunto
set my hand and scal, this Eighth day of September, in the
year of our Lord One thousand cight hundred and seventy-
.four.
Witnessed by,
JOHN HUGHES,
Clerk to George Davies, C.E.,
Patent Office,
St. Ann's Sq.,
THOS. ARNOLD. (L.S.)
Manchester.