ma DEERDED AMORY FURNACES.
Year: 1869

page_text: LETTERS PATENT to Francis Dixon Nuttall, of St. Helens, in
the County of Lancaster, Glass Manufacturer, for the Invention
T
ma
DEERDED AMORY FURNACES.
39
Scaled the 18th September 1869, and dated the 20th March 1869.
PROVISIONAL SPECIFICATION left by the said Francis Dixon
Nuttall at the Office of the Commissioners of Patents, with his
Petition, on the 20th March 1869.
I, FRANCIS DIXON NUTTALL, of St. Helens, in the County of
Lancaster, Glass Manufacturer, do hereby declare the nature of the said
Invention for" IMPROVEMENTS IN OR APPLICABLE TO REVERBERATORY FURNACES,"
to be as follows:-
The first part of my Invention consists in constructing reverberatory
furnaces with a combination of (1) a thin partition or wall formed at the
back of the fuel chamber, so that there is left between the said partition
and the fire-bridge an opening or passage for the regulated admission of
air upwards therethrough to comingle with the fuel gases and thereby
promote combustion, and (2) an opening at the side or openings at both
sides of the furnace at or near the end of the fire-bridge, so that any

page_text: deposit in or stoppage of the above-mentioned air passage may be easily
reached and removed. The said opening or openings are closed when
the furnace is at work.
The second part of my Invention consists of means for supplying
heated air, whereby to cause better combustion in reverberatory furnaces
than hitherto has been secured. For this purpose I lead a tube or tubes
of fire-clay or other refractory substance from the front of the furnace,
where the ends are open to the air, backwards towards the back of or
into the furnace where they terminate. In or on the inner longitudinal
sides of the fire chamber I provide ledges to carry, protect, and support
the said tube or tubes,
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Francis Dixon Nuttall in the Great Seal Patent
Office on the 20th September 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANCIS
DIXON NUTTALL, of St. Helens, in the County of Lancaster, Glass
Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of March, in the
year of our Lord One thousand eight hundred and sixty-nine, in the
thirty-second year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Francis Dixon Nuttall,
Her special license that I, the said Francis Dixon Nuttall, my
executors, administrators, and assigns, or such others as I, the said
Francis Dixon Nuttall, 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 "IMPROVEMENTS IN OR APPLICABLE TO REVER-
BERATORY FURNACES," upon the condition (amongst others) that I, the
said Francis Dixon Nuttall, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the

page_text: 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 Francis Dixon Nuttall, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the accom-
panying Sheet of illustrative Drawings, and to the figures and letters
marked thereon, that is to say:-
The first part of my Invention consists in constructing reverberatory
furnaces with a combination of (1) a thin partition or wall formed at
the back of the fuel chamber, so that there is left between the said
partition and the fire-bridge an opening or passage for the regulated
admission of air upwards therethrough to comingle with the fuel gases
and thereby promote combustion, and (2) an opening at the side or
openings at both sides of the furnace at or near the end or ends of the
fire-bridge, so that any deposit in or stoppage of the above-mentioned air
passage may be easily reached and removed. The said opening or
openings is or are closed when the furnace is at work.
The second part of my Invention consists of means for supplying
heated air, whereby to cause better combustion in reverberatory furnaces
than hitherto has been secured. For this purpose I lead a tube or tubes
of fire-clay or other refractory substance from the front of the furnace,
where the ends are open to the air, backwards towards the back of or
into the furnace where they terminate. In or on the inner longitudinal
sides of the fire chamber I provide ledges to carry, protect, and support
the said tube or tubes.
On the Sheet of Drawings appended hereto with the object of shewing
clearly the manner in which my Invention is carried into practice in
glass makers' reverberatory furnaces, Fig. 1 is a perspective view;
Fig. 2 a longitudinal section; Fig. 3 a horizontal section at the
line A, B; and Fig. 4 a vertical transverse section at the line C, D, all
of a so called tank furnace. In Fig. 3 the double circles marked
indicate the positions four pots would occupy if placed in a furnace of
this kind and size. Like letters denote the same parts in all these
views.

page_text: a, tank; b, working holes; c, crown; d, fire-bars; e, fire-doors;
f, bridges; 9, passages for admission of air upwards from the cave h;
i, dampers or slides for regulating or controlling the quantity of air
allowed to pass through g. Bridges constructed with passages 9 are
gare
known as split bridges. j openings at the ends of the fire-bridges to
allow of the passage of a tool for freeing the passages g. These openings
are shewn closed by plugs k. 1 air tubes of fire-clay or other refractory
substance; these rest on protecting and supporting ledges m formed in
the brickwork, and they terminate at their inner ends preferably im-
mediately over the outer edge of the bridge f. Fig. 5 is a longitudinal
section, and Fig. 6 a transverse section of a similar furnace adapted for
pots and having only one fire-place; n, pots; o, working holes; p, fire-
bars; q, fire-door; r, bridge with openings therethrough; t, regulating
slide or damper; " side openings to facilitate freeing of 8; v, air
tubes.
Having now fully described the nature of my said Invention and
particularized the same, in connection with reverberatory furnaces for
glass making, in such manner that others will be enabled to apply my
improvements to reverberatory furnaces generally, I would have it under-
stood that what I claim is,-
First. The combination of the air passage g and opening or openings j
substantially in the manner and for the purposes set forth.
And, second. The air tubes when rested on ledges m, substantially
in the manner and for the purposes set forth.
In witness whereof, I, the said Francis Dixon Nuttall, have here-
unto set my hand and seal, this Seventeenth day of September,
in the year of our Lord One thousand eight hundred and sixty-
nine.
In the presence of
J. T. KING,
Patent Agent,
Liverpool.
FRANCIS DIXON NUTTALL. (L.S.)