AN IMPROVED ANNEALING POT
Year: 1862

page_text: LETTERS, PATENT to Robert Nurse, of Machen, near Newport, and David
Nurse, the younger, of Pontymister, both in the County of Monmouth,
for the Invention of "AN IMPROVED ANNEALING POT."
PROVISIONAL SPECIFICATION left by the said Robert Nurse and David
Nurse at the Office of the Commissioners of Patents, with their Petition,
on the 1st August 1862.
We, ROBERT NURSE, of Machen, near Newport,. and DAVID NURSE, the
younger, of Pontymister, both in the County of Monmouth, do hereby declare
the nature of the said Invention for "AN IMPROVED ANNEALING POT," to be as
follows:-
The mode heretoforo adopted in the manufacture of annealing pots intended
to be used for annealing plates or sheets of iron to be afterwards coated or
covered with tin, or an alloy of tin and lead, and termed by tin plate manu-
facturers "tin plate," has been to make such pots wholly of cast iron, which
expands and cracks when in the annealing furnace, thereby admitting air into
the pot, which oxidizes the edges of the plates therein, thus rendering such
plates brittle and difficult to coat with tin, or an alloy of tin and lead; besides
which the pot, when made of cast iron, is very heavy and costly. Now the
object and intention of this Invention is to obviate these objections, and to
make the annealing pot considerably lighter, more durable, and less expensive,
which we propose to effect by employing wrought iron instead of cast iron in

page_text: the manufacture of annealing pots, and also in making the pot double, that is
to say, as two cases, one fitting into the other. By these means the metal will
expand and contract without sustaining injury, and the air will be effectually
excluded from the plates therein.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Robert Nurse and David Nurse in the Great Seal Patent
Office on the 31st January 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wo, ROBERT
NURSE, of Machen, near Newport, and DAVID NURSE, the younger, of Ponty-
mister, both in the County of Monmouth, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the First day of August, in the year of our Lord One
thousand eight hundred and sixty-two, in the twenty-sixth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
Robert Nurse and David Nurse, the younger, Her special licence, that we,
the said Robert Nurse and David Nurse the younger, our executors, adminis-
trators, and assigns, or such others as we, the said Robert Nurse and David
Nurse, the younger, 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 IMPROVED
ANNEALING POT," upon the condition (amongst others) that we, the said Robert
Nurse and David Nurse, the younger, our executors or administrators, by an
instrument in writing under our, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said Invention,
and in what manner 'the same was to bo 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 Robert Nurse and David Nurse, the
younger, do hereby declare the nature of our said Invention, and in what
'manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement, that is to say:―
The mode heretofore adopted in the manufacture of annealing pots intended
to be used for annealing plates or sheets of iron to be afterwards coated or
covered with tin, or an alloy of tin and lead, and termed by tin plate manu-

page_text: facturers "tin plate," has been to make such pots wholly of cast iron, which
expands and cracks when in the annealing furnace, thereby admitting air into
the pot, which oxidizes the edges of the plates therein, thus rendering such
plates brittle and difficult to coat with tin, or an alloy of tin and lead; besides
5 which the pot, when made of cast iron, is very heavy and. costly. Now the
object and intention of this Invention is to obviate these objections, and to
make the annealing pot considerably lighter, more durable, and less expensive,
which we propose to effect by employing wrought iron instead of cast iron in
the manufacture of annealing, pots, and also in making the pot double, that is
to say, as two cases, one fitting into the other. By these means the metal will
expand and contract without sustaining injury, and the air will be effectually
excluded from the plates therein.
And in order to explain our said Invention as completely as possible wo
now proceed to describe the best means we are acquainted with for carrying
the same into practical effect, reference being had to the illustrative Sheet of
Drawings accompanying these Presents, and to the numeral figures and letters
of reference marked thereon respectively, as follows:-
DESCRIPTION OF THE SHEET OF DRAWINGS.
Figure 1 represents a top plan view of our improved annealing pot; Figure 2,
a section thereof through A, B, at Figure 1; Figure 8, an end elevation. At
each of the foregoing Figures we employ similar letters of reference to denote
corresponding parts, in so far as such parts appear or can be seen at each of
such said Figures respectively.
A, A, is a case of wrought iron, about one-eighth part of an inch in thick-
ness, formed in one sheet, rivetted at a, a, and left open at one end, as at
Figure 1; B is another case of wrought iron, about one-sixteenth part of au
inch in thickness; this case is seamed at b, b, instead of rivetted. The case B
fits loosely in the case A, and is employed to exclude the entrance of air to the
sheets of metal placed therein to be annealed. An annealing pot thus con-
structed will, when in the annealing furnace, expand and contract without
sustaining any injury, and will weigh only one-fourth of the weight of a pot
made of cast iron to hold plates of the same size as the improved annealing
pot above described. The aforesaid wrought-iron cases may be made of the
commonest puddled iron, which we have found to be quite as durable as tho
best quality of iron, and very much cheaper. The end of the case A, when
worn, may easily be replaced by another piece of sheet iron, whereas an
annealing pot made of cast iron, when cracked or worn, cannot be repaired,
and is consequently useless. We would remark that the outside case A could

page_text: be used singly or without the inner case B, or the inner case could be of
wrought iron and the outer case of cast iron, but we prefer using the two cases
as a double case wholly of wrought iron.
Having now fully described and set forth the nature and object of our said
Invention of "An Improved Annealing Pot," together with the best means
we are acquainted with for carrying the samo into practical effect, we would
remark, in conclusion, that we hereby declare our Invention to consist in, and
we.claim,―
First, manufacturing annealing pots of wrought iron instead of cast iron, as
above described with reference to the accompanying Drawing.
And, secondly, constructing. annealing pots with two cases, or as a double
case, either wholly of wrought iron or of wrought and cast iron, as abovo
stated, and for the purposes set forth.
In witness whereof, we, the said Robert Nurse, and David Nurse, the
younger, have hereunto set our hands and seals, this Twenty-third day
of January, in the year of our Lord One thousand eight hundred and
sixty-three.