AN IMPROVEMENT IN THE DOORS AND DAMPERS OF FURNACES AND OTHER PLACES WHERE INTENSE HEAT HAS TO BE RESISTED
Year: 1858

page_text: .
LETTERS PATENT to James Brookes Fisher and John Fisher, of Stour-
bridge, in the County of Worcester, Fire-brick Manufacturers, and
James Bird, the younger, of Kingswinford, in the County of Stafford,
Agent, for the Invention of "AN IMPROVEMENT IN THE DOORS AND DAMPERS
OF FURNACES AND OTHER PLACES WHERE INTENSE HEAT HAS TO BE RESISTED."
Sealed the 3rd June 1859, and dated the 4th December 1858.
PROVISIONAL SPECIFICATION left by the said James Brookes Fisher,
John Fisher, and James Bird at the Office of the Commissioners of
Patents, with their Petition, on the 4th December 1858.
We, JAMES BROOKES FISHER and JOHN FISHER, of Stourbridge, in the
County of Worcester, Fire-brick Manufacturers, and JAMES BIRD, the
younger, of Kingswinford, in the County of Stafford, Agent, do hereby declare
the nature of the said Invention for "AN IMPROVEMENT IN THE DOORS AND
DAMPERS OF FURNACES AND OTHER PLACES WHERE INTENSE HEAT HAS TO BE
RESISTED," to be as follows:-
This improvement consists in forming the doors and dampers of furnaces
and other places where intense heat has to be resisted of a single slab of fire-
clay bound with wrought or cast iron, in place of iron doors lined with several
fire-bricks and of unlined iron dampers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Brookes Fisher, John Fisher, and James Bird in the
Great Seal Patent Office on the 4th June 1859.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JAMES
BROOKES FISHER and JOHN FISHER, of Stourbridge, in the County of
Worcester, Fire-brick Manufacturers, and JAMES BIRD, the 'younger, of
Kingswinford, in the County of Stafford, Agent, send greeting..
WHEREAS. Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of December, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-second year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said James Brookes Fisher, John Fisher, and James Bird, Her special
licence that we, the said James Brookes Fisher, John Fisher, and James
Bird, our executors, administrators, and assigns, or such others as we, the
said James Brookes Fisher, John Fisher, and James Bird, 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 "AN IMPROVEMENT IN THE DOORS AND DAMPERS
OF FURNACES AND OTHER PLACES WHERE INTENSE HEAT HAS TO BE RESISTED," upon
the condition (amongst others) that we, the said James Brookes Fisher, John
Fisher, and James Bird, or one of us, our executors or administrators, by an
instrument in writing under our, or their, or one of our or their hands and
.seals, should particularly describe and ascertain the nature of the said Inven-
tion, 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 James Brookes Fisher, John Fisher,
and James Bird, do hereby declare the nature of our 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, reference being had to
the Drawings hereunto annexed, that is to say:
This improvement consists in forming the doors and dampers of furnaces
and other places where intense heat has to be resisted of a single slab of fire-
clay bound with wrought or cast iron, in place of iron doors lined with several
fire-bricks and of unlined iron dampers.
Figure 1 is a view of the outside of a door made-according to our Inven

page_text: tion, and suitable for a puddling furnace; and Figure 2, a view of the inside
thereof. A is a slab of fire-clay burnt ready for use; B is an iron frame
formed in one piece, or the bottom of the frame C, carrying the stopper hole D,
may be formed separately from the other part of the frame, and united thereto
by dovetails, as shown at Figure 3, or by other suitable means. The object of
forming the bottom C in a separate piece is to allow of its removal when worn,
and of a similar piece being substituted for it. The frame and slab are
hollowed out at back round the stopper hole D, as shown at Figure 2, to allow
of the puddling tool reaching all parts of the furnace. Figure 4 is a view of
a door or damper without any stopper hole. The slab and frame are each
prepared separately, and the slab is secured in the frame by iron plates or
wedges, as may be required. Doors made as before described will be found
far more durable, and clay being a bad conductor of heat, renders them much
cooler to work with than any heretofore constructed for similar purposes.
And having now described the nature of our said Invention, and in what
manner the same is to be performed, we declare that we claim constructing
doors and dampers of furnaces and other places where intense heat has to be
resisted in manner, herein-before described.
In witness whereof, I, the said James Brookes Fisher, have hereunto
set my hand and seal, this Nineteenth day of May, One thousand
eight hundred and fifty-nine.
Witness,
JOHN CARTWRIGHT,
Dudley.
JAS. B. FISHER. (L.S.)