IMPROVEMENTS IN MOULDING FOR CASTING STEEL, IRON, AND OTHER METALS
Year: 1865

page_text: LETTERS PATENT to Frederick Trachsel, of Manchester, in the County of
Lancaster, Analytical Chemist, and William Hall, of the same Place,
Brass Founder, for the Invention of "IMPROVEMENTS IN MOULDING FOR
CASTING STEEL, IRON, AND OTHER METALS."
Sealed the 22nd May 1866, and dated the 25th November 1865.
PROVISIONAL SPECIFICATION left by the said Frederick Trachsel and
William Hall at the Office of the Commissioners of Patents, with their
Petition, on the 25th November 1865.
We, FREDERICK TRACHSEL, of Manchester, in the County of Lancaster,
Analytical Chemist, and WILLIAM HALL, of the same Place, Brass Frounder,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
MOULDING FOR CASTING STEEL, IRON, AND OTHER METALS," to be as follows:-
According to the usual process of moulding for casting it is well known
that sand is employed, which is more or less siliceous, the silica of which when
submitted to the melting temperature of certain metals becomes fused and
combines with the said metal. Our Invention consists in substituting for the
aforesaid sand a material which does not substantially contain free silica, lime,
or other material which will fuse at the melting temperature of the metal
to be cast. With this view we employ materials with an aluminous base,
which having been reduced to a state of powder are employed in place of the

page_text: usual sand and after the ordinary manner of moulding. As illustrativo of our
Invention we take coal shale or fire-clay and grind it when dry to a powder,
and it may then be used as above described.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Frederick Trachsel and William Hall in the Great Seal
Patent Office on the 24th May 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, FREDERICK
TRACHSEL, of Manchester, in the County of Lancaster, Chemist, and WILLIAM
HALL, of the same Place, Brass Founder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of November, One thousand eight
hundred and sixty-five, in the twenty-ninth year of Her reign, did, for
Herself, Her heirs and successors, give and grant unto us, the said Frederick
Trachsel and William Hall, Her special license that we, the said Frederick
Trachsel and William Hall, our executors, administrators, and assigns, or
such others as we, the said Frederick Trachsel and William Hall, 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
the Isle of Man, an Invention for "IMPROVEMENTS IN MOULDING FOR CASTING
STEEL, IRON, AND OTHER METALS," upon the condition, amongst others, that we,
the said Frederick Trachsel and William Hall, by an instrument in writing
under our hands and seals, or under the hand and seal of one of us, 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 im-
mediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said Frederick Trachsel and William Hall,
do hereby declare the nature of our 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 :-
According to the usual process of moulding for casting it is well known
that sand is employed, which is more or less silicious, the silica of which when
submitted to the melting temperature of certain metals becomes fused and
combines with the said metals. Our Invention consists in substituting for

page_text: the aforesaid sand a material which does not substantially contain force silica,
lime, or other material which will fuse at the melting temperature of the
metal to be cast. With this view we employ materials with an aluminous
base, which having been reduced to a state of powder are employed in place
of the usual sand after the ordinary manner of moulding. As illustrative of
our Invention we take coal shale or fire-clay and grind it when dry to a powder,
and it may then be used after the manner of ordinary sand for moulding. The
substances above mentioned may be ground by "runners," or any other ordinary
apparatus used for grinding or pulverizing. We have above said that the
substances we employ are not substantially to contain free silica, lime, or other
material which will fuse at the melting temperature of the metal to be cast,
we do not therefore intend to convey that small quantities of free silica or
other such substance may not accidentally be present, but our meaning will
be evident to all competent persons as conveying the idea that in the sub-
stances we employ the free silica or other such substance is not recognised
as a component part.
Having thus described and ascertained the nature of our said Invention,
and the manner in which the same is to be performed, we desire it to be
understood that we claim as secured to us under the above in part recited
Letters Patent, the use of pulverized shales, fire-clays, and other silicates of
alumina for the purpose above set forth.
In witness whereof, we, the said Frederick Trachsell and William Hall,
have hereunto set our hands and seals, this Twenty-third day of May,
in the year of Our Lord One thousand eight hundred and sixty-six.
FREDERICK TRACHSEL. (L.B.)
WILLIAM HALL.
(L.S.)