IMPROVEMENTS IN THE MANUFACTURE OF ANNEALING POTS
Year: 1878

page_text: LETTERS PATENT to John Hopkins, of Llanelly, in the County of Carmarthen,
Ironfounder, for the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF
ANNEALING POTS."
Sealed the 9th August 1878, and dated the 25th May 1878.
PROVISIONAL SPECIFICATION left by the said John Hopkins at the Office
of the Commissioners of Patents on the 25th May 1878.
JOHN HOPKINS, of Llanelly, in the County of Carmarthen, Ironfounder.
PROVEMENTS IN THE MANUFACTURE OF ANNEALING POTS."
"IM-
The improvements consist in combining the manufacture of the top and sides, to
be made in one or more pieces, with the bosoming out of the said top, together with
the welding on the ends at the joints of the said top and sides, whereby greater
strength and simplicity is effected. The whole can be made of wrought iron.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Hopkins in the Great Seal Patent Office on the 18th November
1878.
JOHN HOPKINS, of Llanelly, in the County of Carmarthen, Ironfounder. "IM-
PROVEMENTS IN THE MANUFACTURE OF ANNEALING POTS."
The improvements consist in combining the manufacture of the top and sides, to
5 be made in one or more pieces, with the bosoming and hollowing of the top, together
Prine Ad 1

page_text: with the welding on the ends at the joints of the said top and sides, whereby
greater strength and simplicity of construction is effected. The whole is made of
inetal.
The improvements relate to the manufacture of annealing pots used in tin works,
and consist in improvements and simplification in their manufacture.
At present there are two methods of manufacturing annealing pots, both of which
are liable to serious objections and expense.
By one mode the ends and sides are made of one plate with the top plate welded
on. The objections are the long length of welding, and this top plate or roof of
the pot is liable to drop down and the welding to become loose in consequence of the
great heat.
By the other mode the top and sides are made of one plate, and the end plates are
fixed thereto by dovetailing and welding them at the joints. The objections are the
great expense of punching or cutting out the dovetails in both ends of the top and
side plate and of the end plates, and waste of metal by punching, and expense of
properly fitting the plates in dovetails; the roof of the pot made in this form is also
liable to drop when in the furnace.
In practicing the improvements I make the top and sides of one plate, but the
top or roof is bent to a domed or curved form on a mould by hammering, or other-
wise pressed or shaped. This curved form gives additional strength to the pot and
resists the great heat.
The ends I simply weld on at the joints, thus doing away with the great expense
of dovetailing and fitting plates.
.I also make the sides and ends of one plate bent to the required form, and the
top of a separate plate carefully bent on a mould by hammering, or otherwise
formed. After the top has thus been made it is placed in the pot and carefully
welded all round.
The main object of this latter mode of manufacture is that the hollow formed by
the peculiar shape of the top is, before being placed in the furnace, filled with sand,
fire-clay, or other materials to prevent the top dropping by reason of great heat,
and also to improve the quality on the black plate within by preventing those
objectionable marks on the upper plates in the pot called "black edges," which must
naturally result in a saving in the wasters produced.
per-
The accompanying Drawings will serve to illustrate a convenient mode of
forming the improvements, or some of them, but I do not confine myself to the
exact shapes and proportions shown, as they may be varied. In all the Figures A is
the top.
Fig. 1 is a side view; Fig. 2, longitudinal section; Fig. 3, plan; Fig. 4, transverse
section; and Fig. 5, end view of pot with domed top.
And Fig. 6, side view; Fig. 7, longitudinal section; Fig. 8, top plan; Fig. 9, end
view; and Fig. 10, transverse section of pot, with top partly domed and partly
hollowed, for holding any material to which the heat may pass, and thus save the
metal top.
In witness whereof, I, the said John Hopkins, have hereunto set my hand
and seal, this 18th day of November, A.D. 1878.
TAIN HODIZING