A NEW OR IMPROVED MATERIAL FOR FORMING MOULDS EMPLOYED IN CASTING STEEL AND OTHER METALS."
Year: 1864

page_text: LETTERS PATENT to William Tarleton Bury, of Regent Works,
Sheffield, in the County of York, Steel Manufacturer, for the Invention
of "A NEW OR IMPROVED MATERIAL FOR FORMING MOULDS EMPLOYED IN
CASTING STEEL AND OTHER METALS."
PROVISIONAL SPECIFICATION left by the said William Tarleton Bury
at the Office of the Commissioners of Patents, with his Petition, on
the 28th January 1864.
I, WILLIAM TARLETON BURY, of Regent Works, Sheffield, in the County
of York, Steel Manufacturer, do hereby declare the nature of the said
Invention for "A NEW OR IMPROVED MATERIAL FOR FORMING MOULDS EMPLOYED
IN CASTING STEEL AND OTHER METALS," to be as follows:-
The ordinary foundry or moulding sand employed heretofore for forming
moulds for casting metals is apt to melt when subjected to the high tem-
perature to which steel has to be raised for the purpose of casting the same,
and is therefore not suitable for that purpose.
Now my Invention consists in employing for the above-named purpose in
the place of the ordinary moulding sand a pounded silicious stone, known in
the neighbourhood of Sheffield under the name of "gaunister," and employed
heretofore for forming the mortar used in building the interior of furnaces.
Such silicious stone is of a more refractory nature than ordinary moulding
sand, and is consequently better able to withstand the high temperature of
melted steel and other metals. I grind the same down to a powdered state as

page_text: fine as the ordinary moulding sand, and I then treat and employ the same for
forming moulds in precisely the same manner as that in which the latter is
employed; and I mix pounded charcoal, coke dust, or soot with the pounded
gaunistér stone in the same proportions and in the same manner in which
such materials are commonly used in combination with ordinary moulding
sand.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Tarleton Bury in the Great Seal Patent Office on
the 28th July 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
TARLETON BURY, of Regent Works, Sheffield, in the County of York, Steel
Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-eighth day of January, 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 William Tarleton Bury, Her special licence that I, the said
William Tarleton Bury, my executors, administrators, and assigns, or such
others as I, the said William Tarleton Bury, 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 "A NEW OR IMPROVED MATERIAL FOR FORMING MOULDS EMPLOYED
IN CASTING STEEL AND OTHER METALS," upon the condition (amongst others)
that I, the said William Tarleton Bury, 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 William Tarleton Bury, 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 :-
The ordinary foundry or moulding sand employed heretofore for forming
houlds for casting metals is apt to melt when subjected to the high tem-

page_text: perature to which steel has to be raised for the purpose of casting the same,
and is therefore not suitable for that purpose.
Now my Invention consists in employing for the above-named purpose in
the place of the ordinary moulding sand a pounded siliceous stone known in
the neighborhood of Sheffield under the name of "gannister," and employed
heretofore for forming the mortar used in building the interior of furnaces.
Such siliceous stone is of a more refractory nature than ordinary moulding
sand, and is consequently better able to withstand the high temperature of
melted steel and other metals. I grind the same down to a powdered state
as fine as the ordinary moulding sand, and I then treat and employ the same
for forming moulds in precisely the same manner as that in which the latter
is employed; and I mix pounded charcoal, coke dust, soot, clay, or other
materials with the pounded "gannister" stone in the same proportions and in
the same manner in which such materials are commonly used in combination
with ordinary moulding sand.
Having now described the nature of my Invention, and the manner of per-
forming the same, what I claim under the herein-before in part recited
Letters Patent is, the employment of the siliceous stone known by the name
of gannister in a powdered state for moulds for casting steel and other metals.
In witness whereof, I, the said William Tarleton Bury, have hereunto
set my hand and seal, this Twenty-seventh day of July, in the year
of our Lord One thousand eight hundred and sixty-four.
WILLIAM TARLETON BURY. (L.B.)