IMPROVEMENTS IN THE PREPARATION OF INSULATING COMPOUNDS FOR COATING ELECTRIC TELEGRAPH WIRES AND OTHER PURPOSES
Year: 1875

page_text: LETTERS PATENT to Frederick Field, of Upper Marsh, Lambeth, in
the County of Surrey, and Richard Talling, of Lostwithiel, in the
County of Cornwall, for the Invention of "IMPROVEMENTS IN THE
PREPARATION OF INSULATING COMPOUNDS FOR COATING ELECTRIC TELEGRAPH
WIRES AND OTHER PURPOSES."
Sealed the 6th August 1875, and dated the 27th May 1875.
PROVISIONAL SPECIFICATION left by the said Frederick Field and
Richard Talling at the Office of the Commissioners of Patents, with
their Petition, on the 27th May 1875.
We, FREDERICK FIELD, of Upper Marsh, Lambeth, in the County of
Surrey, and RICHARD TALLING, of Lostwithiel, in the County of
Cornwall, do hereby declare the nature of the said Invention for “Im-
PROVEMENTS IN THE PREPARATION OF INSULATING COMPOUNDS FOR COATING ELECTRIC
TELEGRAPH WIRES AND OTHER PURPOSES," to be as follows:-
In the Specification to Letters Patent granted to Augustus Matthiessen
on the 31st December 1869, No. 3778, was described a process for

page_text: "
preparing insulating compounds by mixing together a mineral known as.
ozokerit," or the residue obtained by the partial distillation thereof,
with gutta percha, india-rubber, balata, or other known insulating
substances capable of incorporation with the said substance. The
mixture was described in the Specification as being produced by heating
the substances together until their fusion is effected and then incor-
porating them. It has been found that the said compounds so prepared
become brittle, and are consequently useless as a coating for insulating
telegraph wires and for other purposes where it subject to flexure.
Now according to our present Invention instead of subjecting the said
substances to the action of heat we amalgamate the same either by
dissolving the ingredients by means of solvents, such as coal tar, naptha,
or any other suitable known solvent, and then mixing them together,
or by simply subjecting the ingredients together to a process of masti-
cation by any known mechanical means, and with or without the use of
solvents, whereby they are thoroughly incorporated and reduced to a
plastic state, in which the compound can then either be applied as a
_coating to telegraph wires, or be rolled out in sheets, or made to
assume other desired forms. The compound produced by either of the
above processes remains perfectly pliable.
With the compound prepared as above described may be incorporated
other substances, such as fibrous materials, mica, asbestos, as mentioned
in the said Specification to Matthiessen's Patent.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Frederick Field and Richard Talling in the Great
Seal Patent Office on the 26th November 1875.
1 TO ALL TO WHOM THESE PRESENTS SHALL COME, we, FREDERICK
FIELD, of Upper Marsh, Lambeth, in the County of Surrey, and
RICHARD TALLING, of Lostwithiel, in the County of Cornwall, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of May, in the
year of our Lord One thousand eight hundred and seventy-five, in the

page_text: thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto us, the said Frederick Field and Richard
Talling, Her special license, that we, the said Frederick Field and
Richard Talling, our executors, administrators, and assigns, or such
others as we, the said Frederick Field and Richard Talling, 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 Isle of Man, an Invention for "IMPROVEMENTS IN
THE PREPARATION OF INSULATING COMPOUNDS FOR COATING ELECTRIC TELEGRAPH
WIRES AND OTHER PURPOSES," upon the condition (amongst others) that
we, the said Frederick Field and Richard Talling, our executors or
administrators, by an instrument in writing under our or their hands
and seals, or under the hand and seal of one of us or them, 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 Offico within six calendar
months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that we, the said Frederick Field and Richard
Talling, 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:-
In the Specification to Letters Patent granted to Augustus Matthiessen
on the 31st December 1869, No. 3778, was described a process for
preparing insulating compounds by mixing together a mineral known as
"ozokerit," or the residue obtained by the partial distillation thereof,
with gutta percha, india-rubber, balata, or other known insulating sub-
stances capable of incorporation with the said substance. The mixture
was described in the Specification as being produced by heating the
substances together until their fusion is effected and then incorporating
them. It has been found that the said compounds so prepared become
brittle, and are consequently useless as a coating for insulating telegraph
wires and for other purposes where it is subject to flexure.
Now according to our present Invention instead of subjecting the said
substances to fusion wo amalgamato the sanc uither by dissolving the

page_text: ingredients by means of solvents, such as coal tar naptha, or in any
other suitable known solvent, and mixing them together, or by simply
subjecting the ingredients together to a process of mastication by any
known mechanical means, and with or without the use of solvents,
whereby they are thoroughly incorporated and reduced to a plastic state,
in which the compound can then either be applied as a coating to
telegraph wires, or be rolled out in sheets, or made to assume other
desired forms. The compound produced by either of the above processes
ماطمfastle ali

page_text: In some cases it may be also found advantageous to mix both india-
rubber and gutta percha together with the ozokerit material.
Having thus described the nature of our Invention, and in what
manner the same is to be performed, we claim,—
First. The method of preparing without fusion compounds of ozokerit,
or of the residue after its distillation, and india-rubber by dissolving the
said substances in suitable solvents and mixing them together.
Second. The method of preparing compounds of ozokerit, or of the
residue after its distillation, and india-rubber by masticating the said
substances together till they are thoroughly incorporated.
In witness whereof, we, the said Frederick Field and Richard
Talling, have hereunto set our hands and seals, this Twenty-sixth
day of November, in the year of our Lord. One thousand eight
hundred and seventy-five.
DONEDTAK DINT