IMPROVEMENTS IN FIRE-BARS
Year: 1859

page_text: LETTERS PATENT to Henry Jackson, of Oak Works, Oak Lane, Lime-
house, for the Invention of "IMPROVEMENTS IN FIRE-BARS."
Sealed the 8th November 1859, and dated the 16th September 1859.
PROVISIONAL SPECIFICATION left by the said Henry Jackson at the
Office of the Commissioners of Patents, with his Petition, on the
16th September 1859.
I, HENRY JACKSON, of Oak Works, Oak Lane, Limehouse, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN FIRE-BARS," to be
as follows:-
This Invention has for its object improvements in fire-bars. For these
purposes each fire-bar is made with the upper surface by preference wider than
the lower part, the lower part tapering off to a blunt wedge-shaped section.
The two ends of each bar at the upper surface are made wider than the inter-
mediate parts, so that when the ends of two neighboring bars come together
in a furnace, there will be an air space between the bars. Along the central
part of each bar there is formed a row of holes, which descend some distance
below the upper surface, and then open out on either side of the bar, and such
holes increase in dimensions as they descend from the upper surface. By
these means the air supplied to the fuel on the bars will be divided into
numerous streams, which will improve the combustion of the fuel, and at the

page_text: same time the bars will be kept cool, and by making the holes to increase in
size as they descend from the upper surface, the holes are not liable to become
filled up.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Jackson in the Great Seal Patent Office on the
23rd November 1859.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
JACKSON, of Oak Works, Oak Lane, Limehouse, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixteenth day of September, in the year of our Lord
One thousand eight hundred and fifty-nine, in the twenty-third year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Henry Jackson, Her special licence that I, the said Henry
Jackson, my executors, 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 Inven-
tion for "IMPROVEMENTS IN FIRE-BARS," upon the condition (amongst others)
that I, the said Henry Jackson, my executors 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 performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
This Invention has for its object improvements in fire-bars. For these
purposes each fire-bar is made with the upper surface by preference wider than
the lower part, the lower part tapering off to a blunt wedge-shaped section.
The two ends of each bar at the upper surface are made wider than the inter-
mediate parts, so that when the ends of two neighboring bars come together
in a furnace, there will be an air space between the bars. Along the central

page_text: part of each bar there is formed a row of holes, which descend some distance
below the upper surface and then open out on either side of the bar, and such
holes increase in dimensions as they descend from the upper surface. By
these means the air supplied to the fuel on the bars will be divided into
numerous streams, which will improve the combustion of the fuel, and at the
same time the bars will be kept cool, and by making the holes to increase in
size as they descend from the upper surface, the holes are not liable to become
filled up.
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 side view, Figure 2 a plan; and Figure 3 a transverse
section of a fire-bar constructed according to my improvements. I would
state that the general form or outline of the bar is similar to bars in common
use, and the peculiarity consists in the construction of fire-bars with holes or
air passages a, a, which branch off and open out on either side of the bar, as
is shewn at b, b. It will be seen that the holes or air passages a, a, enlarge
as they descend downwards, and the side holes or air passages b, b, enlarge as
they proceed outwards. By thus making the holes or air passages a, a, b, b,
to increase in size as they descend from the upper surface of the bar, they will
be less liable to become filled up. The air passing up to and through the
numerous holes b, b, a, a, will tend to keep the bars cool, and by the division
of the air into numerous streams, the combustion of the fuel on the fire-bars
will be improved.
In witness whereof, I, the said Henry Jackson, have hereunto set my
hand and seal, this Twenty-second day of November, in the year of
our Lord One thousand eight hundred and
HENRY JACKSON. (L.B.)