IMPROVEMENTS IN THE MANUFACTURE OF TIN AND TERNE PLATES. AND IN THE APPARATUS EMPLOYED THEREIN.
Year: 1873

page_text: LETTERS PATENT to Edward Bagot, of the Upper Forest Tin Plate
Works, Morriston, near Swansea, in the County of Glamorgan, for
the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF TIN AND
TERNE PLATES. AND IN THE APPARATUS EMPLOYED THEREIN.
"
Sealed the 27th January 1874, and dated the 16th September 1873.
PROVISIONAL SPECIFICATION left by the said Edward Bagot at
the Office of the Commissioners of Patents, with his Petition, on
the 16th September 1873.
I, EDWARD BAGOT, of the Upper Forest Tin Plate Works, Morriston,
near Swansea, in the County of Glamorgan, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF TIN AND
TERNE PLATES, AND IN THE APPARATUS EMPLOYED THEREIN," to be as follows:-
This Invention has for its object. improvements in the manufacture of
tin and terne plates, and in apparatus employed therein.

page_text: I employ a new form of soaking pot, designed to minimise the
adsorption of molten tin or terne metal by reducing the number of plates
operated upon and the surface action of the air while in contact there-
with.
At the present time a considerable loss of metal results from the use
of the wide mouthed pots at present employed. This loss arises from
two causes; the pots are able to hold a large number of plates so that
the plates are liable to remain immersed for a long time in the hot
melted tin or terne metal; this causes the metal to be absorbed into the
substance of the plate not only uselessly and wastefully but also
injuriously.
1 Another cause of loss of tin or terne metal is the large surface of
melted metal which the pots now in use expose to the action of the air,
and to that of the flux which floats on the surface of the metal. I
avoid these losses by the use of a narrow pot, such as is shewn in the
annexed Drawing. The width of the pot is such that it will contain
only a comparatively small number of plates so that the pot in working
is rapidly emptied. The pot is widened at the end and at the bottom,
the former to give it a sufficient capacity and to admit of tho plates
being readily withdrawn by the tongue, and the latter to form a
receptacle for the heavier impurities of the metal and to expose a wider
surface to the action of the fire:
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward Bagot in the Great Seal Patent Office
on the 16th March 1874.
TÓ ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
BAGOT, of the Upper Forest Tin Plate Works, Morriston, near Swansea,
in the County of Glamorgan, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of September, in the a
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-

page_text: cessors, give and grant unto me, the said Edward Bagot, Her special
license that I, the said Edward Bagot, my executors, administrators,
and assigns, or such others as I, the said Edward Bagot, 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 THE MANUFACTURE OF TIN AND TERNE PLATES, AND IN THE APPARATUS EMPLOYED
THEREIN," upon the condition (amongst others) that I, the said Edward
Bagot, 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 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 Edward Bagot, do hereby declare
the nature of the 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, that is to say :-
'
This Invention has for its object improvements in the manufacture of
tin and terne plates, and in apparatus employed therein.
I employ a new form of soaking pot, designed to minimise the
absorption of molten tin or terne metal by reducing the number of
plates operated upon and the surface action of the air while in contact
therewith.
At the present time a considerable loss of metal results from the use
of the wide mouthed pots at present employed. This loss arises from
two causes; the pots are able to hold a large number of plates so that
the plates are liable to remain immersed for a long time in the hot
melted tin or terne metal, this causes the metal to be absorbed into the
substance of the plate not only uselessly and wastefully but also
injuriously.
Another cause of loss of tin or tern metal is the large surface of

page_text: and to that of the flux which floats on the surface of the metal. I
avoid these losses by the use of a narrow pot, such as is shewn in the
annexed Drawing. The width of the pot is such that it will contain
only a comparatively small number of plates, so that the pot in working
is rapidly emptied. The pot is widened at the end and at the bottom;
the former to give it a sufficient capacity and to admit of the plates
being readily withdrawn by the tongs, and the latter to form a receptacle
for the heavier impurities of the metal and to expose a wider surface to
the action of the fire.
In the accompanying Drawings Figure 1 is a horizontal section and
Figure 2 a vertical cross section of a pot made according to my plans,
from which-it will be seen that the shape of the soaking pot is such as
only to admit of a small number of plates being placed in it at one time,
that the bottom of the pot is large to present a suitable area for the
action of the fire, and at the same time to form a convenient receptacle
for the deposition of impurities in the tin or terne metal, and also that
the top of the pot is narrowed so as to reduce the area of the molten tin
or terne metal in contact with the atmosphere, whilst the end, or it may
be both ends of the pot is large enough to act as a reservoir for a certain
necessary amount of molten tin or terne metal, and also to give easy
access for removing the plates and molten liquid from the pot.
E, E, are vertical ribs on the sides of the pot to enable those plates
which are at the outsides of the parcel of plates in the pot to be
thoroughly coated with tin or terne metal on both sides and to obviate
the danger of those plates becoming attached to the sides of the pot;
the use of the ribs E, E, is however not essential to the practice of my
Invention.
Pots such as are now in use may be altered so as to reduce their
internal molten metal containing capacity substantially to the form
shewn by introducing into them displacers. The displacers may be of
cast iron, they may be fixed by tap screws to the sides of the pots.
:
The essential feature of my Invention is the use of a narrow pot
holding comparatively few plates and exposing a small, surface of
melted metal, such pot not being in respect to its internal capacity of
the same width throughout but wider at the bottom and end, for the
purposes described. This is what I claim as my improvements in the

page_text: manufacture of tin and terne plates, and in the apparatus employed
therein.
In witness whereof, I, the said Edward Bagot, have hereunto set
my hand and seal, this Twelfth day of March, in the year of
our Lord One thousand eight hundred and seventy-four.