IMPROVEMENTS IN THE MANUFACTURE OF IRON CASTINGS
Year: 1868

page_text: LETTERS PATENT to William Thompson, of No. 11, Rathbone Street,
Canning Town, Barking Road, in the County of Essex, for the
Invention of "IMPROVEMENTS IN THE MANUFACTURE OF IRON CASTINGS."
Sealed the 5th September 1868, and dated the 12th March 1868.
PROVISIONAL SPECIFICATION left by the said William Thompson at
the Office of the Commissioners of Patents, with his Petition, on
the 12th March 1868.
I, WILLIAM THOMPSON, of No. 11, Rathbone Street, Canning Town,
Barking Road, in the County of Essex, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF IRON
CASTINGS," to be as follows:-
My Invention has for its object so to combine wrought iron or other
metals with cast iron in the manufacture of castings as to afford great
strength and durability to the said castings. For this purpose I

page_text: introduce into the mould for the casting, bars, rings, or other suitable forms
of wrought iron or other metals, and I then pour the cast iron into the
mould so as to surround and imbed the wrought iron or other metal
either completely or partially by and in the casting.
In order to bring about a perfect union of the two different metals I
previously cast a thin coating of cast iron upon the bars, rings, or
other forms of wrought iron or other metal in order that when these
are introduced into the mould the molten cast iron poured in shall in
the first instance come in contact and effectually combine with the cast-
iron coating of such bars, rings, or other forms of metal.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Thompson in the Great Seal Patent Office
on the 11th September 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
THOMPSON, of No. 11, Rathbone Street, Canning Town, Barking Road,
in the County of Essex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of March, in the year of
our Lord One thousand eight hundred and sixty-eight, in the thirty-first
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said William Thompson, Her special licence that I,
the said William Thompson, my executors, administrators, and assigns,
or such others, as I, the said William Thompson, my executors, adminis-
trators, and assigns, should at any time agree with, and no others, from
time to time and at all times thereafter during the term therein ex-
pressed, 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 IRON CASTINеs," upon the condition (amongst others) that I, the said
William Thompson, 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 In-
vention, 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

page_text: NOW KNOW YE, that I, the said William Thompson, 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 :-
My Invention has for its object so to combine wrought iron or other
metals with cast iron in the manufacture of castings as to afford great
strength and durability to the said castings. For this purpose I
introduce into the mould for the casting bars, rings, or other suitable
forms of wrought iron or other metals, and I then pour the cast iron
into the mould so as to surround and imbed the wrought iron or
other metal either completely or partially by and in the castings.
In order to bring about a perfect union of the two different metals I
previously cast a thin coating of cast iron upon the bars, rings, or other
forms of wrought iron or other metal, in order that when these are intro-
duced into the mould the molten cast iron poured in shall in the first
instance come in contact and effectually combine with the cast-iron
coating of such bars, rings, or other forms of metal.
Such previous coating of the wrought iron is by preference effected
by dipping the wrought iron in a thoroughly cleansed condition and
treated with a suitable flux into a bath of molten cast iron, and then
withdrawing the same; but in particular cases a thin coating of cast
iron may also be cast upon the wrought iron.
The wrought iron may be cleansed for the above purpose either by
"pickling" or other known processes, or by the dipping process before
mentioned; the iron being for this purpose first dipped and rapidly
withdrawn, and then after treating the same with a suitable flux it is
again dipped for the coating process.
Having thus described the nature of my Invention, and in what
manner the same is to be performed, I wish it to be understood that
I do not claim generally casting cast iron round or upon wrought
iron, as I am well aware that this has been before proposed, but what
I claim is, making iron castings by running the molten cast iron round
or upon bars, rings, or other forms of wrought iron or other metals

page_text: that have previously been coated with cast iron, substantially in manner
herein-before set forth.
In witness whereof I, the said William Thompson have hereunto set
my hand and seal, this Ninth day of September, in the year of
our Lord One thousand eight hundred and sixty-eight.
WILLIAM THOMPSON. (L.S.)