IMPROVEMENTS IN. COATING METALS
Year: 1858

page_text: LETTERS PATENT to David Nurse, Robert Nurse, and George Nurse, of
Machan, in the County of Monmouth, South Wales. Tin Plate Manu-
facturers, for the Invention of "IMPROVEMENTS IN. COATING METALS, AND
Sealed the 14th August 1858, and dated the 27th February 1858.
PROVISIONAL SPECIFICATION left by the said David Nurse, Robert
Nurse, and George Nurse at the Office of the Commissioners of Patents,.
with their Petition, on the 27th February 1858.
We, DAVID NURSE, ROBERT NURSE, and GEORGE NURSE, of Machan, in the
County of Monmouth, South Wales, Tin Plate Manufacturers, do. hereby.
declare the nature of the said Invention for "IMPROVEMENTS IN COATING METALS,.
AND IN THE APPARATUS CONNECTED THEREWITH," to be as follows:-
Our said improvements refer mainly to coating iron and. other metals with.
tin or with an alloy of tin and lead, by using a suitable hot chamber in sub-
stitution of the employment of grease or grease pots in the finishing process;.
and the same is wholly or in part applicable in the process of zincing or
galvanising of metals.
It has been the custom hitherto, after dipping iron or other metal in melted
tin, or an alloy of tin. and lead or other metals used for coating purposes, to
finish the coated articles, by dipping them in a grease pot; to remove thereby
the superfluous adhering metal coating. Now by means of our Invention of

page_text: peculiarly constructed hot chamber, into which the plates or other articles
are placed until the superfluous metal coating, which is kept melted, runs off,
we entirely avoid the necessity of using grease or grease pots. In one form
of hot chamber we employ a cast-iron box, divided into a number of cells by
means of metal partitions, each having a sliding or other suitable independent
Under ordinary circumstances a chamber of twelve cells will suffice
for dipping a large number of plates, the first cell being emptied ready to be
refilled so soon as the last is filled, and so on continuously..
The quantity of lead alloyed with tin, when employing grease as in the
ordinary manufacture of terne plates, is one-half of each; but by means of our
Invention in using the hot chamber we can combine two parts of lead with
one-third part of tin without grease.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said David Nurse, Robert Nurse, and George Nurse in the Great
. Seal Patent Office on the 24th August 1858.
"
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, DAVID
NURSE, ROBERT NURSE, and GEORGE NURSE,. of Machan, in the County of
Monmouth, South Wales, Tin Plate Manufacturers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of February, in the year of
our Lord One thousand eight hundred and fifty-eight, in the twenty-first year
of Her reign, did, for Herself, Her heirs and successors, give and grant unto
us, the said David Nurse, Robert Nurse, & George Nurse, Her special licence
that we, the said David Nurse, Róbert Nurse, and George Nurse, our exe-
cutors, administrators, and assigns, or such. others as we, the said David
Nurse, Robert Nurse, and George Nurse, 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 "IMPROVEMENTS IN COATING METALS, AND IN THE APPARATUS CONNECTED THERE-
WITH," upon the condition (amongst others) that we, the said David Nurse,
Robert Nurse, and George Nurse, our executors, or administrators, by an
instrument in writing under our, or their, or one of their hands and scals,
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.

page_text: 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 David Nurse, Robert Nurse, and
George Nurse, do hereby declare the nature of our said Invention, and in what
5. manner the same is to be performed, to be particularly described and ascer
tained in and by the following statement:-
Our said improvements refer mainly to coating iron and other metals with
tin or with an alloy of tin and lead by using a suitable hot chamber in sub-
stitution of the employment of grease or grease pots in the finishing process;
and the same is wholly or in part applicable in the process of zincing or
galvanizing of metals.
And for the better understanding of our said Invention we will now pro-
ceed to detail the particulars thereof, reference being had to the Drawings
hereunto annexed, in which the same letters refer to like parts throughout..
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a front elevation of a hot cellular chamber, constructed
according to our Invention; Figure 2 is a longitudinal section; Figure 3 is a.
transverse section; and Figure 4 is a plan of the same.
A, A, B, B, is a cast-iron or other chamber, constructed so as to be set in,
brickwork and heated by means of a furnace; C, C, C, are partitions dividing.
the interior of the chamber into a number of cells C¹, C¹, C', each closed at..
top by means of a separate sliding or moveable cover D, D, D; at E is a tap
hole, and at E', E', gutters connecting therewith to run off the collected.
superfluous metal.
We would here remark, that it has been the custom hitherto after dipping,
iron or other metals first in a grease pot and afterwards in melted tin, or an
alloy of tin and lead, or other metals used for coating purposes, to proceed to
finish the coated articles by again dipping them in a grease pot to remove
thereby the superfluous adhering metal coating. Now, by means of our said
invention of a peculiarly constructed hot cellular chamber, into which the plates
or other articles are placed until the superfluous metal coating, which is thus
kept melted, runs off, we entirely avoid the necessity of using grease or grease
pots in the finishing process, and we only use grease in the first or process
preparatory to dipping the plates into the molten metal bath; or, instead of
using grease in the said process preparatory to dipping for coating the plates,
we lay the uncoated plates in a strong saline solution, made of chloride of
zine dissolved in water when manufacturing terne plates, and of chloride of
tin for tin plates, proceeding afterwards to dip them successively in two baths.

page_text: of molten metal, one technically called the "tin pot," the other the "wash pot,"
and finish them by the simple transfer of each plate, as dipped, to its separate
cell in our said hot chamber.
It will be observed from the foregoing description, that in one form of our
hot chamber we employ a cast-iron box, divided into a number of cells by
means of metal partitions, each having a sliding or other similar independent
cover. Under ordinary circumstances a box or chamber of from twelve to
sixteen cells will suffice for a large number of plates, the first cell being
emptied ready to be refilled so soon as the last is filled, and so on continuously
while being used. The quantity of lead alloyed with tin when employing
grease, as in the ordinary manufacture of terne plates, is generally about one-
half of each; but by means of our Invention in using the hot chamber we
can combine two-thirds or thereabouts of lead with one-third part of tin,
with or without employing grease.
Having thus fully described the nature of our said Invention, and one mode
of arranging suitable apparatus for practically carrying out the same, we wish
it to be understood that our hot chamber being capable of a variety of modifi-
cations without affecting the principle of our improvements, we do not, there-
fore, limit ourselves to any precise dimensions, materials, or form of hot
chambers or mode of heating them, whether by the direct action of a furnace
or furnaces, or by means of hot air supplied from other sources, so long as by
any modification thereof the principle of our said improvements is substan-
tially maintained; and we do declare that what we claim as our Invention is,
the employment of a hot chamber or chambers for keeping the tinned, zinced,
or other metal plates, after being coated by dipping in a bath of molten metal
or alloys, sufficiently hot to allow the running off from their surfaces of super-
fluous coating.
In witness whereof, I, David Nurse, on behalf of myself and the said
Robert Nurse and George Nurse, have hereunto set my hand and
seal, this Nineteenth day of August, in the year of our Lord 1858.
בויז
ם זזז..
DAVID
RSE. (..)