IMPROVEMENTSLECTRICA CONDUCTOR
Year: 1883

page_text: LETTERS PATENT to John Imray of No 28 Southampton Buildings Chancery
<< IMPROVEMENTS IN
Lane in the County of Middlesex for an Invention of
"
Communicated to him from abroad by The
ELECTRICAL CONDUCTORS
Société Anonyme des Cables electriques (Système Berthoud Borel & Cie) of
PROVISIONAL SPECIFICATION left by the said John Imray at the Office
of the Commissioners of Patents on the 1st February 1883.
دو
JOHN IMRAY of No: 28 Southampton Buildings, Chancery Lane in the County
[Communicated to
of Middlesex "IMPROVEMENTS IN ELECTRICAL CONDUCTORS
him from abroad by The Société Anonyme des Cables electriques (Système
Berthoud Borel & C) of Paris, France]
This invention relates to the construction of electrical conductors in such a
manner that they are efficiently insulated, protected against damp and injury and
against interference by extraneous currents, whilst the sheathing which protects
them is so arranged that the conducting wires or sets of wires are always retained
in a central position, notwithstanding severe flexures or great changes of tempera-
ture. For this purpose, the wire or set of wires constituting the conductor is, in
the first place, covered with a layer of cotton or other suitable fibrous material or
with several layers thereof and soaked in a bath at a temperature of 300° to
350° Fahr, consisting of the insulating material described in the specification
to Letters Patent dated 29th March 1882 N° 1516, the soaking being continued
until the fibrous covering is completely freed from moisture, and impregnated with
the insulating material. The conductor thus covered is now covered with a sheath
of lead by the method and apparatus described in the specification to Letters
Patent dated 6th December 1880, N° 5083, but the lead sheath thus put on is passed
through a notched matrix so that three or more longitudinal ribs project a little
from its general cylindrical surface.
A second sheath of lead is now put on in the same way as the first, this second
sheath having an internal diameter equivalent to the width across the ribs of the
first and, consequently, enclosing seginental spaces between the ribs, which spaces
are filled in the sheathing process with pitch or other similar substance impermeable
to moisture

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent file
by the said John Imray in the Great Seal Patent Office on the 27th July
1883.
JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County
of Middlesex "IMPROVEMENTS IN ELECTRICAL CONDUCTORS"
to me from abroad by The Société Anonyme des Cables électriques (Système
A communication
Berthoud Borel & C¹) of Paris, France.
This invention relates to the construction of electrical conductors in such a
manner that they are efficiently insulated, protected against damp and injury and
against interference by extraneous currents, whilst the sheathing which protects
them is so arranged that the conducting wires or sets of wires are always retained
in a central position, notwithstanding severe flexures or great changes of tempera-
ture. For this purpose, the wire or set of wires constituting the conductor is, in
the first place, covered with a layer of cotton or other suitable fibrous material or
with several layers thereof and soaked in a bath at a temperature of 300° to
350° Fah, consisting of the insulating material described in the Specification
to Letters Patent dated 29th March 1882 N° 1516, the soaking being continued
until the fibrous covering is completely freed from moisture, and impregnated with
the insulating material. The conductor thus covered is now covered with a sheath
of lead by the method and apparatus described in the Specification to Letters
Patent dated 6th December 1880, N° 5083, but the lead sheath thus put on is
passed through a notched matrix so that three or more longitudinal ribs project a
little from its general cylindrical surface.
A second sheath of lead is now put on in the same way as the first, this second
sheath having an internal diameter equivalent to the width across the ribs of the
first and, consequently, enclosing segmental spaces between the ribs, which spaces
are filled in the sheathing process with pitch or other similar substance impermeable
to moisture.
Fig. 1 of the accompanying drawings shews the form of the matrix to be used in
the apparatus described in the Specification N° 5083 of 1880 above referred to, for
forming the lead casing with triangular ribs corresponding to the notches a of the
matrix, of which there may be a less or greater number according to the size of
the conductor. Fig. 2 is a section of the conductor with its lead casing & presenting
the ribs b, and Fig. 3 is a section of the same enclosed within the lead tube t', the
space between the two lead sheaths being filled in during the sheathing process 3
with pitch cor with other impermeable material of like kind.
t
Having thus described the nature of the said invention and in what manner the
same is to be performed, as communicated to me by my foreign correspondents, I
claim :
First. For covering electrical conductors, the use of cotton or other fibrous material 4
soaked with the insulating substance described in the Specification Nº 1516
of 1882, substantially as herein described.
Second. For covering and encasing an electrical conductor the combination of the
fibrous covering soaked in insulating substance, a lead sheathing tube inade
with projecting ribs, a layer of pitch or equivalent substance, and an external 4
sheathing tube, substantially as herein described.
In Witness whereof I the said John Imray have hereunto set my hand and
seal this Twenty Seventh day of July in the year of our Lord One thousand
eight hundred and eighty three.