AN IMPROVED MOULDERS' BLACKING
Year: 1862

page_text: LETTERS PATENT to Joseph Steinthal, of Abbey Hey Works, Gorton,
near Manchester, in the County of Lancaster, Manufacturing Chemist
for the Invention of "AN IMPROVED MOULDERS' BLACKING."
Sealed the 22nd May 1863, and dated the 26th November 1862.
PROVISIONAL SPECIFICATION left by the said Joseph Steinthal at the
Office of the Commissioners of Patents, with his Petition, on the 26th
November 1862.
I, JOSEPH STEINTHAL, of Abbey Hey Works, Gorton, near Manchester, in
the County of Lancaster, Manufacturing Chemist, do hereby declare the
nature of the said Invention for "AN IMPROVED MOULDERS' BLACKING," to be
as follows:-
Instead of the ground charcoal hitherto used by moulders in the process of
making metal castings, I use the following materials in about the under-
mentioned proportions
Wood charcoal
Anthracite, commonly called shale, or slate
Animal, carbon
-
0.45
0.45
0.10
with a small quantity of prussiate of potash; the said materials to be well
mixed together and reduced to a fine powder, by grinding, pounding, or other
suitable means.
I subject the anthracite used in the manufacture of this improved blacking

page_text: to the process of cokeing in a stove or kiln, by which the paraffin, oily, and
sulphurous substances and gases are extracted. The anthracite and animal
carbon being non-conductors withstand the sulphuric gases of the fluid metal,
so that the coat of blacking between the mould and the metal remains intact,
the fluid metal forming a perfect casting, thus preventing blisters and blemishes
on the castings caused by the affinity of the sulphuric gases to the silicate
contained in the sand.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Joseph Steinthal in the Great Seal Patent Office on
the 26th May 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPH
STEINTHAL, of Abbey Hey Works, Gorton, near Manchester, in the County of
Lancaster, Manufacturing Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-sixth day of November, in the year of our
Lord One thousand eight hundred and sixty-two, in the twenty-sixth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Joseph Steinthal, Her special license that I, the said Joseph
Steinthal, my executors, administrators, and assigns, or such others as I, the
said Joseph Steinthal, 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
"AN IMPROVED MOULDERS' BLACKING," upon the condition (amongst others)
that I, the said Joseph Steinthal, 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 Joseph Steinthal, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement (that is to say) :-
Instead of the ground charcoal hitherto used by moulders in the process of

page_text: making metal castings, I use the following materials in about the under-
mentioned proportions:
Wood charcoal
Anthracite, commonly called shale, or slate
Animal carbon
0.45
0.45
0.10
with a small quantity of prussiate of potash; the said materials to be well
mixed together, and reduced to a fine powder by grinding, pounding, or other
suitable means.
I subject the anthracite used in the manufacture of this improved blacking
to the process of cokeing in a stove or kiln, by which the paraffin, oily, and
sulphurous substances and gases are extracted. The anthracite and animal
carbon being non-conductors withstand the sulphuric gases of the fluid metal,
so that the coat of blacking between the mould and the metal remains intact,
the fluid metal forming a perfect casting, thus preventing blisters and
blemishes on the castings caused by the affinity of the sulphuric gases to the
silicate contained in the sand.
In witness whereof, I, the said Joseph Steinthal, have hereunto set my
hand and seal, this Twenty-fifth day of May, in the year of our Lord
One thousand eight hundred and sixty-three.
JOSEPH STEINTHAL. (L.S.)