Improvements in Electric Conductors.
Year: 1894

page_text: Date of Application, 3rd May, 1894
Complete Specification Left, 18th Jan., 1895-Accepted, 23rd Feb., 1895
PROVISIONAL SPECIFICATION.
Improvements in Electric Conductors.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Anne's Gate,
Westminster, in the County of Middlesex, and WILHELM DIESELHORST, of
28, Wellington Road, Old Charlton in the County of Kent, Electrical Engineers,
do hereby declare the nature of this invention to be as follows:-
According to this invention, a strand of copper, or other conducting wire is
covered with paper or tape and then is covered with insulating material consisting
of a compound of rubber or its equivalents such as oxidised oil, with French chalk
or equivalent mineral material such as silicates or powdered pumice stone, and
ozokerite, paraffine or ceresine with a very small addition of some colouring matter.
No sulphur or sulphur compound is mixed with the material, which is used in the
unvulcanized condition. These ingredients are well mixed together to form &
dough which is rolled out in sheets. The sheets are then cut into strips and the
strips are wound helically over the taped or papered conductor, preferably in
several layers to resist high voltage. The conductor thus insulated is then covered
with lead and armoured as usual. Concentric cables are made in a similar manuer
and as it is preferred to have always a paper or other tape next to the conductor
there is in a concentric cable a paper or tape both under and over the outer
conductor.
The proportions of the ingredients employed in making the insulating_dough
may be varied, to suit the requirements as to insulation of the conductors
manufactured.
Dad thin ond dan of Mar 1901
ABEL & IMRAY,
Agents for the Applicants.
Improvements in Electric Conductors.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Anne's Gate,
Westminster, in the County of Middlesex, and WILHELM DIESELHORST of
28 Wellington Road, Old Charlton in the County of Kent, 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 :-
According to this invention a strand of copper, or other conducting wire is
covered with paper or tape and then is covered with insulating material consisting
of a compound of rubber or its equivalents such as oxidised oil, with French chalk
or equivalent mineral material such as silicates or powdered pumice stone, and
ozokerite, paraffine or ceresine with a very small addition of some colouring
matter. No sulphur or sulphur compound is mixed with the material, which is
used in the unvulcanized condition. These ingredients are well mixed together to
form a dough which is rolled out in sheets. The sheets are then cut into strips,
and the strips are wound helically over the taped or papered conductor, preferably

page_text: in several layers to resist high voltage. The conductor thus insulated is then
covered with lead and armoured as usual. The lead covering is necessary because
the insulating material is not vulcanised and is put on as a tape. Concentric cables
are made in a similar manner and as it is preferred to have always a paper or other
tape next to the conductor or to have the conductor tinned there is in a concentric
cable a paper or tape both under and over the outer conductor, unless the wires
forming the conductor are tinned.
The proportions of the ingredients employed in making the insulating dough
may be varied to suit the requirements as to insulation of the conductors
manufactured.
We have found the following compositions suitable, about 20 parts by weight of
caoutchouc, 75 parts of French chalk, and parts of ceresine wax, with a very
little such as foth part of colouring matter.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we declare that what we
claim is :-
An electric conductor having its conducting metal insulated by helically coiling
on it strips of insulating compound such as is herein described and covering the
same with lead.
D
11"
حيمد
1
T
ABEL & IMRAY,
Agents for the Applicants.