An Improvement in the Manufacture of Submarine Electric Conductors
Year: 1899

page_text: Date of Application, 12th Dec., 1899
Complete Specification Left, 31st Aug., 1900-Accepted, 24th Nov., 1900
PROVISIONAL SPECIFICATION.
"An Improvement in the Manufacture of Submarine Electric
Conductors."
We, SIEMENS BROTHERS & CO. LIMITED of 12 Queen Anne's Gate, Westminster
S.W. and WILHELM DIESELHORST, of 182 Victoria Road, Old Charlton, Kent,
Electrical Engineers, do hereby declare the nature of this invention to be as
follows:
It is desirable that submarine electric conductors employed for telegraphic,
and especially those for telephonie purposes, should have the lowest possible
capacity, such as can only be obtained by carrying the bare conducting wire
or strand in a tube of insulating material of larger diameter, so that the wire
is almost entirely surrounded by air or other gas.
This invention relates to means of manufacturing such a conductor. For
this purpose, the insulating material which forms the wall of the tube, such,
for instance, as gutta percha, in a heated plastic condition is forced through a
die provided with a core so as to form a tube.
The core is tubular and has water forced through it as the tube is drawn, this
water cooling the tube as it is formed and charging it under a little pressure so
that it is not liable to be deformed after leaving the die, nor to be collapsed by
the pressure of the external cooling water through which it is caused to travel.
While the tube is thus being formed, the conducting wire or strand is passed
through a stuffing box or nipple into the tubular core at a speed corresponding
to that at which the tube issues from the die, so that the tube containing the
conductor is prepared by the one operation. The water is afterwards discharged
or forced from the tube, the interior of which is dried by forcing through it
air preferably desiccated by passing it over or through calcium chloride or other
suitable absorbent of moisture. Instead of employing water to prevent the tube
from collapsing while its material is in a soft condition, cold air or other gas
may be introduced under moderate pressure, in which case the drying of the
interior of the tube may be dispensed with.
Doind this 12th day of December 1899.
"An Improvement in the Manufacture of Submarine Electrio
Conductors."
We, SIEMENS BROTHERS & CO. LIMITED, of 12 Queen Anne's Gate, Westminster,
S.W, and WILHELM DIESELHORST of 182 Victoria Road, Old Charlton, Kent,
017

page_text: Electrical Engineers, do hereby declare the nature of this invention, and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
It is desirable that submarine electric conductors employed for telegraphic,
and especially those for telephonic purposes, should have the lowest possible
electrostatic capacity, such as can only be obtained by carrying the bare conduct-
ing wire or strand in a tube of insulating material of larger diameter, so that
the wire is almost entirely surrounded by air or other gas.
This invention relates to means of manufacturing such a conductor. For this
purpose, as shewn in the accompanying sectional plan, the insulating material
which forms the wall of the tube, such, for instance, as gutta purcha a in a
heated plastic condition is forced through a die b provided with a core c so as
to form a tube d.
The core is tubular and has water forced through it from a pipe e as the tube
is drawn, this water cooling the tube as it is formed and charging it under a little
pressure so that it is not liable to be deformed after leaving the die, nor to be
collapsed by the pressure of the external cooling water through which it is caused
to travel. While the tube is thus being formed, the conducting wire or strand ƒ
is passed through a stuffing box or nipple into the tubular core at a speed
corresponding to that at which the tube issues from the die, so that the tube
containing the conductor is prepared by the one operation. The water is after-
wards discharged or forced from the tube, the interior of which is dried by
forcing through it air preferably desiccated by passing it over or through calcium
chloride or other suitable absorbent of moisture. Instead of employing water to
prevent the tube from collapsing while its material is in a soft condition, cold
air or other gas may be introduced under moderate pressure, in which case the
drying of the interior of the tube may be dispensed with.
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is:-
The herein described method of manufacturing a submarine electrical con-
ductor consisting of a tube of insulating material containing a conducting wire
or strand of less diameter, substantially as and for the purpose set forth.
Dated this 31st day of August 1900
ABEL & IMRAY
Agents for the Applicants