IMPROVEMENTS IN FURNACES
Year: 1852

page_text: LETTERS PATENT to Edward Aitchison, Lieutenant in the Royal
Navy, of 14, Manor Street, Chelsea, and John Evans, of 8,
Hamilton Street, Wandsworth Road, Boiler Maker, for the In-
"
PROVISIONAL SPECIFICATION left by the said Edward Aitchison
and John Evans at the Office of the Commissioners of Patents,
with their Petition, on the 24th November 1852.
We, EDWARD AITCHISON, Lieutenant in the Royal Navy, of 14,
Manor Street, Chelsea, and JOHN EVANS, of 8, Hamilton Street,
Wandsworth Road, Boiler Måker, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN FURNACES" to be as
follows:
The object of this Invention is to apply apparatus to the fire bars
arranged to admit air to the products of the fuel in the furnace. The
apparatus consists of a rectangular or other shaped air passage which
descends below the fire bars into the ash pit, and ascends above the
fire bars, and above the fuel thereon. There is a slide or valve to ad-
just the quantity of the air passing into the furnace, and the metal

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward, Aitchison and John Evans, in the
Great Seal Patent Office on the 24th May 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we,
EDWARD AITCHISON, Lieutenant in the Royal Navy, of 14, Manor
Street, Chelsea, and JOHN EVANS, of 8, Hamilton Street, Wandsworth
Road, Boiler Maker, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of November,.in
the year of our Lord One thousand eight hundred and fifty-two, in
the sixteenth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto us, the said Edward Aitchison and John
Evans, Her special licence that we, the said Edward Aitchison and
John Evans, our executors, administrators, and assigns, or such
others as we, the said Edward Aitchison and John Evans, our
executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times there-
after 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 the Isle of
Man, an Invention for "IMPROVEMENTS IN FURNACES," upon the con-
dition (amongst others) that we, the said Edward Aitchison and
John Evans, or one of us, by an instrument in writing under: our
hands and seals, or under the hand and seal of one of us, 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 we, the said Edward Aitchison and John
Evans, do hereby declare the nature of the said Invention, and in
what manner the same is to be performed, to be particularly described

page_text: and ascertained in and by the following statement thereof (that is
to say):
The object of this Invention is to apply apparatus to the fire bars
arranged to admit air to the products of the fuel in the furnace.
The apparatus consists of a rectangular or other shaped air passage,
which descends below the fire bars into the ash pit, and ascends
above the fire bars and above the fuel thereon. There is a slide or
valve to adjust the quantity of air passing into the furnace, and the
metal is protected by means of fire brick from being injured by the
heat of the furnace.
And in order that our said Invention may be more fully under-
stood and readily carried into practice, we will proceed to describe
the means pursued by us.
DESCRIPTION OF THE DRAWING.
Figure 1, shews a plan of part of the fire bars of a furnace having
our improvements applied thereto, and Figure 2, shows a longitu-
dinal section of the parts which constitute our Invention. a, a, are
the ordinary fire bars; "b, is an opening for admitting air into the
furnace. By the arrangement shewn, three bars are cast together
with an opening longitudinally, to receive a hollow brick or lump
by which air passes up above the fire bars. In some cases a slide
or valve may be used to regulate the passage of the air to the furnace.
We would remark that we do not confine ourselves to the precise
form of the parts.
But what we claim is, the manufacture of furnaces with openings
descending into the ash pit, the sides rising above the fire and above
the fuel as herein described.
In witness whereof, I, the said Edward Aitchison, have here-
unto set my hand and seal, this Twenty-fourth day of May,
One thousand eight hundred and fifty-three.
Witness,
S. CARPMAEL.
E. AITCHISON, R.N. (L.s.)