IMPROVEMENTS IN APPARATUS FOR SUPPLYING AIR, TO FURNACES
Year: 1859

page_text: LETTERS PATENT to John Chanter, of Bow Road, Proprietor of Patents,
and David Annan, Engineer, of Bow, both in the County of Middlesex,
for the Invention of "IMPROVEMENTS IN APPARATUS FOR SUPPLYING AIR,
TO FURNACES."
PROVISIONAL SPECIFICATION left by the said John Chanter and David
Annan at the Office of the Commissioners of Patents, with their Petition,
on the 15th August 1859.
We, JOHN CHANTER, of Bow Road, Proprietor of Patents, and DAVID
ANNAN, Engineer, of Bow, both in the County of Middlesex, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN APPARATUS FOR
SUPPLYING AIR TO FURNACES," to be as follows:-
This Invention has for its object improvements in apparatus for supplying
air to furnaces. For these purposes the fire-door of a furnace is made on its
inner side with a projecting chamber or enclosure, the surface of which
nearest the fire is perforated or made with numerous holes or small passages
for atmospheric air to pass into the furnace. At the outer side of the door an
outer case encloses a space at all sides but one, the opening into such space
being, by preference, at the bottom. This enclosed space outside the door is
divided by a partition which acts as a regulating valve; this partition is sus-
pended at its upper end, and is capable of being retained in any position
according to the quantity of air for the time being required to be admitted to

page_text: the furnace through the door. It is preferred that the upper part of the
partition should admit of some air constantly passing over it, then through the
door into the inner chamber, and thence to the furnace. The moveable
partition is so arranged that when its lower edge is in contact with the
furnace door the passage of air to the furnace through the door, except over
the partition, will be stopped, and according as the lower end of the moveable
partition is moved more away from the door, more air will be admitted to the
furnace through the door.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Chanter and David Annan in the Great Seal Patent
Office on the 15th February 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
CHANTER, of Bow Road, Proprietor of Patents, and DAVID ANNAN, Engineer,
of Bow, both in the County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifteenth day of August, 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 us,
the said John Chanter and David Annan, Her special licence that we, the
said John Chanter and David Annan, our executors, administrators, and
assigns, or such others as we, the said John Chanter and David Annan,
our 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
APPARATUS FOR SUPPLYING AIR TO FURNACES," upon the condition (amongst
others) that we, the said John Chanter and David Annan, our executors or
administrators, by an instrument in writing under our or their hands and
seals, or under the hand and seal of one of us or them, 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 John Chanter, on behalf of myself
and the said David Annan, do hereby declare the nature of the said.

page_text: air can pass to the interior of the furnace by the narrow space left at the top
of the partition; but when the edge of the partition is removed to a distance
from the surface of the fire-door, the air passes more or less freely to the
interior of the furnace, according to the distance left for it between the two.
The air passes through the opening b' in the fire-door into the chamber c, and
there becomes highly heated, this chamber being in contact with or close to
the ignited fuel on the fire grate. When heated, the air escapes by the per-
forations c' into the body of the furnace.
Figure 4 is a transverse section of apparatus. for supplying air to furnaces
slightly differing in construction from the arrangement before described, in
that the fire-door has many passages 6 through it, in place of one only, and
that the chamber c is divided up into a number of zig-zag passages c*.
Figure 5 is a front view of this arrangement, with the outer case & and the
parts in connection with it removed. In this Figure also a portion of the
fire-door is removed, to show a front view of the piece c. This piece is con-
veniently formed of cast iron. It is preferred to tap screws into the fire-
door, and to put the same into a mould, and cast the piece c on to it; the
screws then entering the two pieces serve to hold them together; other means
of securing these two parts the one to the other may, however, be adopted.
Figure 6. is a transverse section of another slight modification of the
apparatus shown at Figures 1, 2, and 3, and Figures 7 is a front view of
the same. The case d and the parts connected with it are in this latter
Figure removed, a portion of the fire-door being also broken away to show
the arrangement of the inner chamber. This apparatus differs from that first
described, in that the chamber c is cast without any back plate, and the sides
of the chamber have grooves formed in them into which the fire tiles c³ are
fitted. This arrangement is more applicable than that first described when
the draft of the furnace is rapid, and likely to cause the back plate of the
chamber c to burn rapidly away.
In witness whereof, I, the said John Chanter, have hereunto set my
hand and seal, this Fourteenth day of February, in the year of our
Lord One thousand eight hundred and sixty.