IMPROVEMENTS IN MOULDS FOR CASTING METALS
Year: 1864

page_text: LETTERS PATENT to Henry Cochrane, of Ormesby Iron Works, Middles-
borough-on-Tees, in the County of York, Engineer, for the Invention of
"IMPROVEMENTS IN MOULDS FOR CASTING METALS."
Sealed the 23rd August 1864, and dated the 5th March 1864..
PROVISIONAL SPECIFICATION left by the said Henry Cochrane at the
Office of the Commissioners of Patents, with his Petition, on the
5th March 1864.
I, HENRY COCHRANE, of Ormesby Iron Works, Middlesborough-on-Tees, in
the County of York, Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN MOULDS FOR CASTING METALS," to be as
follows:-
My Invention has for its object the formation of permanent moulds for
casting iron and other metals that shall not act injuriously on the casting by
chilling the surfaces of the same, or by engendering gases. For this purpose
I make such moulds of a composition consisting of fire-clay mixed with black
lead or plumbago, or of fire-clay mixed with black lead and silicon, or of black
lead mixed with silicon, the composition which I have found suitable for the
purpose being one-third of black lead mixed with two-thirds of fire-clay, with
a small proportion of silicon, but I in no way limit myself to these proportions.
The moulds when made are, by preference, dried gradually at a moderate
heat.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Cochrane, in the Great Seal Patent Office on the
3rd September 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
COCHRANE, of Ormesby Iron Works, Middlesborough-on-Tees, in the County of
York, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent bearing date the Fifth day of March, in the year of our Lord One
thousand eight hundred and sixty-four, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Henry Cochrane, Her special licence that I, the said Henry
Cochrane, my executors, administrators, and assigns, or such others as I,
the said Henry Cochrane, 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 "Ix-
PROVEMENTS IN MOULDS FOR CASTING. METALS," upon the condition (amongst
others), that I, the said Henry Cochrane, 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 Henry Cochrane, 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 the formation of permanent moulds for
casting iron and other metals that shall not act injuriously on the casting by
chilling the surfaces of the same, or by engendering gases. For this purpose
I make such moulds of a composition consisting of fire-clay mixed with black
lead or plumbago, and the silicate of magnesia, known as asbestos, or of
black lead mixed with asbestos; the composition which I have found suitable
for the purpose being one part of black lead mixed with two parts of fire-clay
with a small proportion of asbestos, but I in no way limit myself to
these proportions as they may be variously modified. It is essential that
the moulds when made should be dried gradually at a moderate heat, so as

page_text: to prevent their attaining a bricky nature, and, furthermore, that no sand
should be mixed with the materials employed. The moulds are supported by
casings of cast iron or other suitable materials in a similar manner to ordinary
sand or loam moulds.
Having now described the nature of my Invention, and the manner in which
it is to be performed, I wish it to be understood that I am well aware that it
has already been proposed to form moulds for casting metals of fire-clay with
or without the admixture of plumbago and sand, and to bake or burn them at
a red heat, so as to attain the nature of a brick, and I do not in any way
claim moulds so formed; but what I claim is, making and using moulds for
casting iron and other metals formed of fire-clay mixed with black lead or
plumbago and the silicate of magnesia known as asbestos, or formed of black
lead or plumbago and asbestos only.
In witness whereof, I, the said Henry Cochrane, have hereunto set my
hand and seal, this Thirty-first day of August, in the year of our Lord
One thousand eight hundred and sixty-four.
Witness,
JOSIAH WILLIAM LISTER,
Middlesbrough-on-Tees.
HENRY COCHRANE. (L.s.)