IMPROVEMENTS IN FIRE-BARS
Year: 1860

page_text: LETTERS PATENT to Henry Jackson, of Oak Works, Oak Lane, Lime-
house, in the County of Middlesex, for the Invention of "IMPROVEMENTS
IN FIRE-BARS."
Sealed the. 21st December 1860, and dated the 27th July 1860..
PROVISIONAL SPECIFICATION left by the said Henry Jackson at the.
Office of the Commissioners of Patents, with his Petition, on the▸
27th July 1860.
I, HENRY JACKSON, of Oak Works, Oak Lane, Limehouse, in the County-
of Middlesex, do hereby declare the nature of the Invention for "IMPROVE-*
MENTS IN FIRE-BARS," to be as follows:-
This Invention has for its object improvements in fire-bars. In the Speci-
fication of a former Patent granted to me,' dated 16th September 1859,
(No. 2111), a fire-bar is described having a series of perforations or air
passages formed in it along its upper surface, which passages as they descend
below the level of the bar expand or become wider, so that any small coals or
ashes which enter them may fall clear away. Now the forming such passages
or perforations in the bars is found to weaken them, and cause them to burn'
out more rapidly than they otherwise would. Now, according to this Inven-
tion, I increase the width of the face of the bar opposite each perforation or*

page_text: passage, and in order that bars so formed may, when laid side by side in the
furnace to form the fire grate; leave proper longitudinal air passages of uni-
form width between the bars, I do not make all the bars used precisely of the
same shape, as is usual, but I so form each alternate bar that the wider por-
tions of the face of one bar, at the points where the air passages are formed,
may come opposite the plain portions of the adjacent bars; this also causes
the air to be more uniformly diffused.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Jackson in the Great Seal Patent Office on the
26th January 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
JACKSON, of Oak Works, Oak Lane, Limehouse, in the County of Middlesex,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of July, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-fourth year of Her reign,
did, for Herself, Hér heirs and successors, give and grant unto me, the said
Henry Jackson, Her special licence that I, the said Henry Jackson, my execu-
tors, administrators, and assigns, or such others as I, the said Henry Jackson,
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 FIRE-BARS,"
upon the condition (amongst others) that I, the said Henry Jackson, my execu-
tors or administrators, by an instrument in writing, under my 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 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 Henry Jackson, 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:-

page_text: This Invention has for its object improvements in fire-bars. In the Specifi-
cation of a former Patent granted to me, dated 16th September 1859,
(No. 2111), a fire-bar is described having a series of perforations or air pas-
sages formed in it along its upper surface, which passages as they descend
below the level of the bar expand or become wider, so that any small coals or
ashes which enter them may fall clear away. Now the forming such passages
or perforations in the bars is found to weaken them and cause them to burn
out more rapidly than they otherwise would. Now, according to this Inven-
tion, I increase the width of the face of the bar opposite each perforation or
passage; and in order that bars so formed may when laid side by side in the
furnace to form the fire grate leave proper longitudinal air passages of uni-
form width between the bars, I do not make all the bar used precisely of
the same shape, as is usual, but I so form each alternate bar that the wider
portions of the face of one bar at the points where the air passages are formed
may come opposite the plain portions of the adjacent bars; this also causes the
air to be more uniformly diffused.
Having thus stated the nature of my said Invention, I will proceed more
fully to describe the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Figure 1 shews a perspective view of a fire-bar constructed according to my
Invention; and Figure 2 shews a plan of some of these fire-bars placed side
by side; Figure 3 shews two transverse sections thereof; Figure 4, a per-
spective view of another fire-bar constructed according to my Invention, which
somewhat differs in form, but is essentially the same as the previous one, so
far as regards making those parts of the bars where the air passages come
wider than the intermediate parts of the bars; Figure 5 shews a plan of some
of these bars side by side; and Figure 6 shews two transverse sections thereof.
These bars are in other respects similar to the bars constructed under my
former Patent. Each bar, as was described in my former Specification, is of
a wedge-form section, or is made with a web at the lower part. The air pas-
sages a, a, which are formed in the upper surface of each bar descend to a
certain distance and then open out at b, b, on each side of the bar; the wedge
or web form at the lower part of a bar, being in other respects the same as
ordinary fire-bars.
The novelty of this Invention consists in giving greater width and conse-
quently greater strength to my formerly patented fire-bars at those places
where the air passages come. I do not, however, claim the making bars

page_text: wider at the places where air-passages come when the air passages pass
completely through the bars from top to bottom.:
In witness whereof, I, the said Henry Jackson, have hereunto set my
hand and seal, this Twenty-fifth day of January, in the year of our
Lord One thousand eight hundred and sixty-one.
HENRY JACKSON. (L.S.)