AN IMPROVED PROCESS OF MAKING FOIL OF LEAD COATED WITH TIN
Year: 1867

page_text: LETTERS PATENT to Alfred Vincent Newton, of the Office for Patents,
66, Chancery Lane, in the County of Middlesex, Mechanical Draughts-
man, for the Invention of "AN IMPROVED PROCESS OF MAKING FOIL OF
LEAD COATED WITH TIN."-A communication from abroad by William
Woodman Huse. of New York City, in the United States of America.
PROVISIONAL SPECIFICATION left by the said Alfred Vincent Newton at
the Office of the Commissioners of Patents, with his Petition, on the
5th February 1867.
I, ALFRED VINCENT NEWTON, of the Office for Patents, 66, Chancery Lane,
in the County of Middlesex, Mechanical Draughtsman, do hereby declare the
nature of the said Invention for "AN IMPROVED PROCESS OF MAKING FOIL OF
LEAD COATED WITH TIN," to be as follows:-
The object of this Invention is to avoid the objections attendant on the
use of layers of the metals or of lead or its alloy coated by repeated dippings
in a bath of molten tin.
The present Invention consists in taking tin pipe of the required length,
diameter, and thickness of metal, and filling the inside of it with lead or any

page_text: alloy of lead, and then rolling the compound ingot in the manner heretofore
practised to the required thickness for foil. The tin pipe may be filled by
pouring molten metal therein or inserting a solid plug.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Alfred Vincent Newton in the Great Seal Patent Office on
the 3rd August 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALFred
VINCENT NEWTON, of the Office for Patents, 66, Chancery Lane, in the County
of Middlesex, Mechanical Draughtsman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifth day of February, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Alfred Vincent Newton, Her special licence that I, the said Alfred Vincent
Newton, my executors, administrators, and assigns, or such others as I, the said
Alfred Vincent Newton, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all times there-
after 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 PROCESS
OF MAKING FOIL OF LEAD COATED WITH TIN," being a communication' to me from
abroad, upon the condition (amongst others) that I, the said Alfred Vincent
Newton, my executors or administrators, by an instrument in writing under iny,
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 Alfred Vincent Newton, 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 (that is to say):
Various processes have been invented for making foil of lead coated on the
outer surfaces with tin. One of these processes which is practised consists
in taking an ingot of lead of the length, width, and thickness required, placing
it between two laminæ of tin, and by successive rollings welding the two

page_text: metals and reducing the whole to the required thickness; this process is
attended with serious difficulties.
Another process consists in taking an ingot of lead of the required size and
form, and coating it with tin to the required thickness by successive dippings
in molten tin, and then subjecting the ingot so coated to successive rollings;
but this is objectionable because of the liability of getting the tin of unequal
thickness.
To avoid the objections to the said processes is the object of the present
Invention, which consists in taking a tin pipe of the required length, diameter,
and thickness, and filling it with lead or any alloy of lead and then rolling
the compound ingot in the manner heretofore practised to the required
thickness for foil.
To enable persons skilled in the art to practise the said Invention I will
describe the various modes in which it has been successfully..worked.
of the said tin pipe and place it in
.
According to one of the said modes I take tin pipe, made in any of the
known modes and of a diameter and length and thickness of metal suited to
the intended width and length of foil required, and of a thickness such as
when drawn out with the lead inside, will give the required thickness of
lamina of lead and tin; I close one-
a vertical position in any suita
containing a refrigerating liquid,
such as water with ice and st when thus exposed to the influence of the
cooling medium I fill the tin pipe with lead or its alloy by pouring, molten
lead or its alloy into it. During such pouring the tin is maintained at a
temperature so low by the cooling medium that it will not be melted by the
much higher temperature of the lead within; so soon as the lead or alloy of
lead has solidified and been reduced to a temperature below the melting
point of tin, the pipe so filled with lead can be taken out of the cooling
medium, and the mass of lead thus surrounded with tin is in a suitable.
condition for being reduced by repeated rollings between rollers to the
thinness required for foil. The rolling is to be done in the usual way
generally practised in the manufacture of tin, and lead foil and the tin and
lead or alloy of lead will be found to be perfectly united, however thin the
laminæ of tin and lead may be; or I take the tin pipe made of the required
dimensions by any of the known processes for making tin or lead pipe, such
for instance as forcing the tin from a cylinder through a die of the required
diameter for the exterior of the pipe and around a central core which
determines the calibre, and then making the ingot of lead or alloy of lead by
a like mode of procedure but without a central core. The diameter of the
ingot of lead should be slightly less than the calibre of the tin pipe so that the

page_text: one can be readily inserted in the other; and after, the lead or alloy of lead has
been inserted in the pipe, I subject them to end pressure either applied endwise
so as to increase the diameter of the lead or by pressure applied to the cir-
cumference or otherwise to bring the surfaces into contact. If desired a disc of
tin can be soldered on to each end and then with or without having the ends
enclosed the ingot is to be rolled in the usual manner and to the required
thinness. Or I make a tube of tin slightly tapering and a plug or ingot of lead
or alloy of lead of a corresponding taper, and the two of such a diameter that
when the lead is forced into the tin pipe the surfaces of the two will be brought
into close contact; and then the ingot thus prepared can be rolled as before.
stated. If desired the ends of the compound ingot before rolling can be covered
with tin as before stated.
Having now set forth the nature of the Invention of "An Improved
Process of Making Foil of Lead Conted with Tin," as communicated to me
from abroad, and explained the manner of carrying the same into effect, I
wish it to be understood that under the above in part recited Letters Patent
I claim, making foil of lead coated with tin on both sides by filling a pipe
made of tin with lead or alloy of lead and then rolling the compound ingot
thus formed as set forth.
In witness whereof, I, the said Alfred Vincent Newton, have hereunto
set my hand and seal, the Third day of August, in the year of our Lord
One thousand eight hundred and sixty-seven.
Witness,
J. W. MOFFATT,
66, Chancery Lane.
A. V. NEWTON. (L.S.)