IMPROVEMENTS IN SUPPLYING AIR TO FURNACES
Year: 1854

page_text: LETTERS PATENT to Philip James Chabot, of Spitalfields, in the County
of Middlesex, for the Invention of "IMPROVEMENTS IN SUPPLYING AIR TO
FURNACES."
Sealed the 20th March 1855, and dated the 25th September 1854.
PROVISIONAL SPECIFICATION left by the said Philip James Chabot at
the Office of the Commissioners of Patents, with his Petition, on the
25th September 1854.
I, PHILIP JAMES CHABOT, of Spitalfields, in the County of Middlesex, do
hereby declare the nature of the Invention for "IMPROVEMENTS IN SUPPLYING
AIR TO FURNACES" to be as follows:-
This Invention has for its object the supplying air to furnaces by mechanical
means in such manner that numerous jets or streams of air shall be caused to
pass over the fuel on the fire bars (in a direction from front to back of a
furnace) for a time after fresh fuel has been applied. For this purpose a fan
or any suitable air-forcing apparatus is applied to a furnace. A pipe or pipes
(passing over the fire door or at the front of the furnace) is or are applied with
a rose head or apparatus for dividing the air into numerous jets or streams,
which, passing over the fuel on the fire bars, mixes with the products rising

page_text: from the fresh fuel. So long as those products require such an additional
supply of air, then the supply of air will be reduced or wholly shut off till
fresh fuel is again supplied.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Philip James Chabot in the Great Seal Patent Office on
the 24th March 1855.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PHILIP
JAMES CHABOT, of Spitalfields, in the County of Middlesex, Esquire, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of September, in the year of our Lord
One thousand eight hundred and fifty-four, in the eighteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Philip James Chabot, Her special licence that I, the said Philip
James Chabot, my executors, administrators, and assigns, or such others as
I, the said Philip James Chabot, 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 "Iы-
PROVEMENTS IN SUPPLYING AIR TO FURNACES," upon the condition (amongst
others) that I, the said Philip James Chabot, 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 saine 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 Philip James Chabot, 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 the supplying air to furnaces by mechanical
means in such manner that numerous jets or streams of air shall be caused to
pass over the fuel on the fire bars (in a direction from front to back of a
furnace) for a time after fresh fuel has been applied. For this purpose a fan or

page_text: any suitable air-forcing apparatus is applied to a furnace. A pipe or pipes
(passing over the fire door or at the front of the furnace) is or are applied
with a rose head or apparatus for dividing the air into numerous jets or
streams, which, passing over the fuel on the fire bars, mixes with the products
rising from the fresh fuel. So long as those products require such an additional
supply of air, then the supply of air will be reduced or wholly shut off till fresh
fuel is again supplied.
Having thus stated the nature of my said Invention, I will proceed to
describe the manner of performing the same.
It has been long known that the smoke and unconsumed products evolved
at the front part of a furnace may be ignited, and more or less effectually
consumed, if combined with atmospheric air, and then brought in contact with
well-ignited fuel; I do not, therefore, claim the combining of such unignited
products with atmospheric air generally, but only certain means of accomplishing
such application of atmospheric air to furnaces, and these means consist of
introducing a pipe or pipes (generally only one pipe, unless for a wide furnace,)
above, in, or near to the fire door of a furnace, and forcing air through the
same by mechanical means. The inner end of this pipe is supplied with a rose
head T piece, or bent tube, perforated with numerous holes, or with a spreader
or other suitable instrument, to divide or spread the current of atmospheric air,
which is to be forced through the pipe by a fan, or by other suitable blowing
apparatus. The air thus forced into the front part of the furnace, is by the
pipe and rose head, or other form of distributing instrument, caused to pass or
sweep over the partially ignited fuel last fed into (and which remains for the
most part at the front of) the furnace, so that the air thus forced into the
furnace mixes with the products evolved from the partially ignited coal, and
by reason of the jets or divided or spread streams or sheets of air forced
through the pipe or pipes being directed downwards, or towards and over the
well-ignited fuel at the back of the furnace, the mixture of unignited products
and atmospheric air will be forced to, and be heated and inflamed by, the well-
ignited fuel more advantageously than by the means heretofore resorted to for
applying atmospheric air to the unconsumed products evolved from fresh fuel
in a furnace. I would here state that my Invention consists in thus using
fans or blowing apparatus to introduce atmospheric air at or near the front of
the fire by means of a pipe or pipes and distributing or spreading apparatus.
and so that the air thus forced in may mix with and cause the unconsumed
products to pass towards and sweep over the well-ignited fuel at the back of
the furnace; but I do not claim to introduce a stream or streams of air at the
front of a furnace unless the air be forced by blowing apparatus. The form

page_text: of the apparatus thus used to force and distribute air may be varied; but it is
desirable in all cases to have means of modifying and regulating the quantity
of air from time to time, and thus to admit of the supply of air forced into
the furnace and above the fuel, according to my Invention, being readily cut off
or modified, as required.
In witness whereof, I, the said Philip James Chabot, have hereunto
set my hand and seal, this Twenty-fourth day of March, in the year
of our Lord One thousand eight hundred and fifty-five.
Witness,
S. CARPMAEL.
PHILIP J. CHABOT. (L.S.)