IMPROVEMENTS IN PREPARING, MIXING, AND GRINDING THE VARIOUS KINDS OF PLUMBAGO, GRAPHITE, OR BLACK LEAD, EITHER TOGETHER OR SEPARATE, AND WITH OR WITHOUT OTHER MATERIALS, FOR POLISHING, LUBRI- CATING, AND FOR OTHER PURPOSES, AND IN OTHERWISE PREPARING THE SAME FOR SALE
Year: 1855

page_text: ETTERS PATENT to William Monday the younger, Partner in the firm
of Sollitt, Monday, & Co., of Kingston-upon-Hull, in the County of York,
for the Invention of "IMPROVEMENTS IN PREPARING, MIXING, AND GRINDING
THE VARIOUS KINDS OF PLUMBAGO, GRAPHITE, OR BLACK LEAD, EITHER TOGETHER
OR SEPARATE, AND WITH OR WITHOUT OTHER MATERIALS, FOR POLISHING, LUBRI-
CATING, AND FOR OTHER PURPOSES, AND IN OTHERWISE PREPARING THE SAME
FOR SALE."
Sealed the 24th July 1855, and dated the 15th March 1855.
PROVISIONAL SPECIFICATION left by the said William Monday at the
Office of the Commissioners of Patents, with his Petition, on the
15th March 1855.
I, WILLIAM MONDAY the younger, Partner in the firm of Sollitt, Monday,
& Co., of Kingston-upon-Hull, in the County of York, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN PREPARING, MIXING, AND
GRINDING THE VARIOUS KINDS OF PLUMBAGO, GRAPHITE, OR BLACK LEAD, EITHER
TOGETHER OR SEPARATE, AND WITH OR WITHOUT OTHER MATERIALS, FOR POLISHING,
LUBRICATING, AND FOR OTHER PURPOSES, AND IN OTHERWISE PREPARING THE SAME
FOR SALE," to be as follows:-

page_text: My improvements in preparing, mixing, and grinding the various kinds of
black lead, plumbago, or graphite consists in so reducing and treating those
materials as to remove all grit and extraneous matters, thereby producing a
much purer article than is obtained by the ordinary process. I either wash
and steep, or steep one or more kinds of these materials in a solution of acid
or acids and water, or in other suitable materials, previous to the process of
levigation, for the purpose of dissolving the grit or other extraneous matters,
and effecting their separation. I then grind these materials either together or
separately with edge runners or other description of grinding apparatus, during
which operation the levigating process is assisted by the application of steam
heat; after this, I pass these materials in a state of liquid or pulp into a vat
or vats by means of a spout or spouts of such form, size, and arrangement as
may be found convenient, so as to intercept all or any of the gritty matter, and
to allow only the finest particle or particles of such state of fineness as may be
required to pass into the vat or vats. The graphite, plumbago, or black lead
thus prepared may be levigated and reduced to a much finer powder, and is
better adapted for its several purposes, than when prepared in the manner
heretofore practised.
The second part of my Invention consists in reducing graphite, plumbago,
and black lead to a state of pulp or paste, by mixing with soap, or soap, and
water, or such other materials as may be adapted for maintaining these
materials in a state of paste, pulp, or liquid for wholesale and retail dis-
tribution, in which state they are packed in boxes, pots, or other convenient
envelope best adapted for the purpose.
Another part of my Invention refers to the preparation of these materials in
packets for sale, the same being packed in wood boxes, block surface paper,
or tins.