AN IMPROVEMENT OR IMPROVEMENTS IN STEAM BOILER AND OTHEK FURNACES.
Year: 1854

page_text: LETTERS PATENT to Charles Hargrove, of Birmingham, in the County
of Warwick, Manufacturer, for the Invention of "AN IMPROVEMENT OR
IMPROVEMENTS IN STEAM BOILER
AND OTHEK
FURNACES.
Sealed the 28th April 1854, and dated the 1st March 1854.
PROVISIONAL SPECIFICATION left by the said Charles Hargrove at the
Office of the Commissioners of Patents, with his Petition, on the 1st
March 1854.
I, CHARLES HARGROVE, of Birmingham, in the County of Warwick, Manu-
facturer, do hereby declare the nature of the said Invention for "AN IMPROVE-
MENT OR IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES" to be as
follows:-
My Invention consists in making the fire bars of steam boiler and other
furnaces hollow, and introducing air heated by passing through the said hollow
bars at the bridge or other suitable part of the furnace, for the purpose of
suppressing or preventing the formation of smoke. The air heated by passing
through the said hollow bar effects the prevention of smoke without the
lowering of temperature, which occurs when cold air is introduced for that
purpose. I do not limit myself to any particular arrangement of furnace, the
essence of my Invention consisting in heating air by causing it to pass through
hollow fire bars, and introducing the said heated air into the furnace for the
purpose of preventing the formation of smoke.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Charles Hargrove in the Great Seal Patent Office on the
29th August 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
HARGROVE, of Birmingham, in the County of Warwick, Manufacturer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the First day of March, in the year of our Lord
One thousand eight hundred and fifty-four, in the seventeenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Charles Hargrove, Her special licence that I, the said Charles Hargrove,
my executors, administrators, and assigns, or such others as I, the said
Charles Hargrove, 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 "AN IMPROVEMENT OR IM-
PROVEMENTS IN STEAM BOILER AND OTHER FURNACES," upon the condition (amongst
others) that I, the said Charles Hargrove, 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.
NOW KNOW YE, that I, the said Charles Hargrove, 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)-
My Invention consists in making the fire bars of steam boiler and other
furnaces hollow, and introducing air heated by passing through the said hollow
bars at the bridge or other suitable part of the furnace, for the purpose of
suppressing or preventing the formation of smoke. The said air heated by
passing through the said hollow bars may also be applied to the heating of
furnaces, ovens, or kilns, as herein-after described, with reference to a furnace
for annealing cast iron.
Figure 1 represents in transverse vertical section a steam boiler furnace
constructed according to my Invention; Figure 2 represents a longitudina
vertical section, of the fire-place of the same; and Figure 3 represents a pla

page_text: of the said fire-place. a, a, a, are the fire bars; each of these consist. or a
hollow or trough-like bar, the sides and front end of which are perforated, as
represented. One of these bars is represented in Figure 4, in side elevation,
marked 6; in transverse section, marked c; and in front or end elevation,
marked d. Any number of the said bars are fixed side by side, as represented
in the plan, Figure 3. The posterior ends of these bars rest on the bottom of
the chamber e, (see Figure 2,) situated in the bridge of the furnace f. This
chamber is represented in Figure 5, in front elevation, marked g; and in
transverse section, marked h. The anterior ends of the bars a, a, a, rest on the
bottom of the inclined grate i. This grate is shewn separately in Figure 6, in
front elevation, marked k; and in transverse section, marked 1. The course of
the air in the furnace is indicated by the arrows in Figure 2, that is to say, a
portion of the said air passes through the slits or perforations in the bars a, a, a,
thereby maintaining the combustion of the fuel in the said furnace, while
another portion of air passes through the chamber e and enters the furnace at
the bridge f, as indicated by the curved arrow in Figure 2. The air heated by
passing through the hollow bars, in the manner described, effects the prevention
of smoke without the lowering of temperature, which occurs when cold air is
used for that purpose. Figure 7 represents in horizontal section, and Figure 8
in transverse vertical section, a furnace for annealing cast iron, constructed
according to my Invention. m, m, are a series of fire-places, the bars of
which are made hollow. These bars are represented in Figure 9, in plan
The said hollow bars are
marked n, and in transverse section marked o.
fixed in chambers p, p, one of which is shewn in Figure 10, in elevation
marked q, and in transverse section marked ; and also in Figure 11, in
horizontal section marked s.
The course of the air is indicated by the arrows in Figures 7 and 8, that is
to say, the air enters by the central channel t, and branching off by the side
channels u, u, passes into the hollow bars of the fire-places m, m, and becomes
heated thereby. The said heated air next passes by the channels v, v, and
which the com-
openings w, w, into the furnace or oven x.
bustion of the fuel is supported enters between the bars of the furnaces
m, m, from the ash pits y, y, and mixes with the heated air which has been
introduced into the furnace or oven x by the channels w, w.
The air
Having now described the nature of my said Invention, and the manner of
carrying the same into effect, I wish it to be understood that I do not limit
myself to the precise methods herein described and represented, as the same '
may be varied without departing from the nature of my said Invention. But

page_text: I claim as my Invention, making bars of steam boiler and other furnaces hollow,
and causing the air heated in the said hollow bars to be applied to the sup-
pression or consumption of the smoke of the furnaces, or to heating furnaces,
ovens, or kilns, as herein-before described and illustrated in the accompanying
Drawing.
In witness whereof, I, the said Charles Hargrove, have hereunto set my
hand and seal, this Twenty-sixth day of August, in the year of our Lord
One thousand eight hundred and fifty-four.
Witness,
GEORGE SHAW.
CHARLES HARGROVE. (L.S.)