IMPROVED METHOD OR MEANS OF MAKING THE INSULATING BODIES OF ELECTRIC LIGHT CONDUCTING WIRES NON-INFLAMMABLE
Year: 1882

page_text: LETTERS PATENT to William Alfred Phillips of Homerton in the county of
Middlesex and Samuel Edmund Phillips of Charlton in the County of Kent
Electrical Engineers, for an invention of IMPROVED METHOD OR MEANS OF
MAKING THE INSULATING BODIES OF ELECTRIC LIGHT CONDUCTING WIRES
NON-INFLAMMABLE
PROVISIONAL SPECIFICATION left by the said William Alfred Phillips
and Samuel Edmund Phillips at the Office of the Commissioners of Patents
on the 31st May 1882.
WILLIAM ALFRED PHILLIPS of Homerton in the county of Middlesex and
SAMUEL EDMUND PHILLIPS of Charlton in the county of Kent Electrical
Engineers IMPROVED METHOD OR MEANS OF MAKING THE INSULATING BODIES OF
ELECTRIC LIGHT CONDUCTING WIRES NON-INFLAMMABLE
This Invention relates First to the employment of Tungstate of soda or other
chemical acids salts or oxides capable of rendering pitch, india rubber gutta percha
and other bodies non inflammable either mixed directly or otherwise to insulating
or mechanical coverings of electrical wires Secondly to a special method of making
an oily solution of the said substance or substances which solution may be mixed
with any compound material, or varnish used to cover wires
Hitherto wires used for conveying electric currents have generally been insulated
with cotton silk or some fibrous material alone or in combination with India rubber
or gutta percha etc and in the case of any interruption or short circuit where a
spark might be produced or the wires overheated the insulating covering being highly
inflammable might catch fire and considerable danger incurred Our object is to
avoid this by covering the wire with a material which will not catch fire or so
rendering the materials at present in use non-inflammable
Our invention consists in passing such wires covered or uncovered through a
solution of Tungstate of soda or other materials of a non-inflammable character

page_text: For the second part of our invention a concentrated aqueous solution of
Tungstate of Soda is prepared and is poured into boiled Linseed Oil or other oily
or gummy substance which is heated and kept stirred until the water has been
evaporated A portion of this prepared fluid is mixed with the insulating compound
used to cover the wire. The Tungstate of Soda may be directly added to India
Rubber, Gutta Percha or to any other insulating material but it has been found
most convenient to apply it in the way above described.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Alfred Phillips and Samuel Edmund Phillips in the Great
Seal Patent Office on the 30th November 1882.
WILLIAM ALFRED PHILLIPS of Homerton in the County of Middlesex and
SAMUEL EDMUND PHILLIPS of Charlton in the County of Kent, Electrical
Engineers "IMPROVED METHOD OR MEANS OF MAKING THE INSULATING BODIES
OF ELECTRIC-LIGHT CONDUCTING WIRES NON-INFLAMMABLE."
This Invention relates First to the employment of Tungstate of Soda or other
chemical Acids, salts, or oxides capable of rendering pitch india rubber Gutta percha
and other bodies non-inflammable either mixed directly or otherwise to insulating
or mechanical coverings of electrical wires]
Secondly to a special method of making an oily solution of the said substance or
substances which solution may be mixed with any compound material or varnish
used to cover wires
Hitherto wires used for conveying electric currents have generally been insulated
with cotton, silk, or some fibrous material alone or in combination with India
rubber or Gutta percha etc and in the case of any interruption or short circuit
where a spark might be produced or the wires over heated the Insulating covering
being highly inflammable might catch fire and considerable danger incurred.
Our object is to avoid this by covering the wire with a material which will not
catch fire or so rendering the materials at present in use non-inflammable
Our Invention consists in passing such wires covered or uncovered through a
solution of Tungstate of Soda (by preference we take a cotton silk or india rubber
or gutta percha covered wire) and pass it or them through a compound which has
been treated with Tungstate of Soda or other materials of a non-inflammable
character.
For the Second part of our Invention, a concentrated aqueous solution of
Tungstate of Soda is prepared and is poured into boiled Linseed Oil or other oily
or gummy substance which is heated and kept stirred until the water has been
evaporated. A portion of this prepared fluid is mixed with the insulating compound
used to cover the wire.
The Tungstate of Soda may be directly added to India rubber, Gutta percha, or

page_text: to any other insulating material, but it has been found most convenient to apply it
in the way above described.
Having now described the nature of our said Invention and in what manner the
same is to be performed, we declare that we claim :-
First The employment of Tungstate of Soda or other chemical acids, salts or
oxides capable of rendering pitch, India rubber, Gutta percha and other bodies
non-inflammable either mixed directly or otherwise to insulating or mechanical
coverings of electrical wires in the manner aforesaid.
Secondly-The special method of making an oily solution of the said substance
or substances, which solution may be mixed with any compound, material, or
varnish used to cover wires as herein before described.
In witness whereof I the said William Alfred Phillips for myself and on
behalf of the said Samuel Edmund Phillips have hereunto set my hand
and seal this Thirtieth day of November, in the year of our Lord, One
thousand eight hundred and eighty two.
w a failure (LS)
WA