Improvements in Telephone Conductors or Cables.
Year: 1899

page_text: plication, 22nd Sept., 1900
Complete Specification Loft 22nd lune 1000 Accented tot Sant
1000
Complete Specification Loft, 22nd June 1000 Accepted, fot Sant, 1000
PROVISIONAL SPECIFICATION.
Improvements in Telephone Conductors or Cables.
We, The Joint Stock Company styled KABELWERK RHEYDT ACTIENGESELL-
SCHAFT, Manufacturers of Electric Cables and JOSEPH ZAPPE and ADOLPH
HOHNHOLZ, Managers of said Company, all of Rheydt, in the Kingdom of Prussia
and Empire of Germany, do hereby declare the nature of the said invention to
be as follows reference being had to the drawings hereunto annexed and to the
figures and letters marked thereon that is to say:-
This invention relates to the construction of electric conductors and cables
more especially intended for telephone purposes and its object is to secure them
against induction so as to enable sensitive current impulses to be transmitted
fully and to protect them from any disturbance apt to arise through the influ-
ence of induction.
رو
The improved conductor has for its main feature that the conductor proper
or wire core is surrounded by or enveloped in convolutions of wire preferably
iron or steel wire " spun or wound around with textile or other material and
that this coiled wire although intended to surround the conductor from end to
end, is yet interrupted at points situated at predetermined distances apart.
By such means the transmission of electric currents arising from induction is
prevented and their influence rendered uninjurious.
A piece of telephone conductor constructed in accordance with this invention is
represented by way of example in the accompanying drawings the insulating
envelope or casing being shown as extending only over part of the length of
conductor so as to expose the coiled enveloping wire.
According to this invention a conductor a of copper or the like is wound with
as a rule comparatively thin secondary wire b which is in any suitable manner
insulated from external influences say by being "spun
" around with silk and
is wound on the main conductor spirally or in helical convolutions the conductor
together with the wire so wound round it being then provided with a suitable
protective casing such as c preferably of a spun paper band or strip.
The secondary or enveloping wire should preferably be iron or steel though
it may be made of any other suitable metal.
It has the effect of protecting the conductor proper a from disturbance by
induction which it has the power of keeping at a distance as it were, or neu-
tralizing, any induced currents being rendered innocuous in the iron steel or
other metal of the secondary wire in the condition of gyrating currents.
An essential point in this connection is that the enveloping wire is not applied
to the conductor proper as one connected conducting wire extending throughout
the length thereof but that it is interrupted at predetermined intervals so as
to prevent the transmission or propagation of induced electric currents...
The enveloping of the conductor with the insulated secondary wire between
the convolutions or coils of which a predetermined space is left free, has the
further effect that in conjunction with the paper casing which surrounds it, it
provides air spaces the presence of which is a desirable fundamental condition in
regard to the insulation of telephone conductors.

page_text: It has been attempted before now to attain this result by winding wires with
paper strips rolled into tubes or similar material affording hollow spaces.
By adopting the mode of construction herein described, telephone conducting
cables of every description may be manufactured.
Individual conductors constructed on this system may be combined with cach
other and with one common casing, and if necessary they may be further sur-
rounded with a lead casing.
As far as the ultimate effect is concerned it is of course immaterial whether the
insulating layer consisting of either silk cotton paint or the like covers the
conductor proper or the enveloping wire
The advantage of the novel method of construction of telephone conductors
in any case resides in the fact that the transmission of sound may thereby be
carried to far greater distances than it could be done by means of conductors
as manufactured hitherto and further that in conjunction with such a conductor
the earth may be utilized as a return conductor.
By such means one half of the usual number of conductors-as compared with
the ordinary double conductor system is saved.
The further treatment and connection of such conductors with cables are
effected in the usual manner any suitable armouring and protective casings being
applicable.
D
1
00
1 1
P a
1000
WHITE & WOODINGTON,
Birkbeck Bank Chambers, Southampton Buildings, London, Agents.
We, The Joint Stock Company styled KABELWERK RILEYDT ACTIENGESELL-
SCHAFT, Manufacturers of Electric Cables and JOSEPH ZAPPE and Apolpii
HOHNHOLZ, Managers of said Company, all of Rheydt, in the Kingdom of Prussia
and Empire of Germany, 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 reference being had to the drawings
accompanying our Provisional Specification and to the figures and letters marked
thereon, that is to say:-
This invention relates to the construction of electric conductors and cables
more especially intended for telephone purposes and its object is to secure them
against induction so as to enable sensitive current impulses to be transmitted
fully and to protect them from any disturbance apt to arise through the influ-
ence of induction.
66
39
The improved conductor has for its main feature that the conductor proper
or wire core is surrounded by or enveloped in convolutions of wire preferably
iron or steel wire spun or wound around with textile or other material and
that this coiled wire although intended to surround the cor ductor from end to
end, is yet interrupted at points situated at predetermined distances apart.
By such means the transmission of electric currents arising from induction is
prevented and their influence rendered uninjurious.
A piece of telephone conductor constructed in accordance with this invention is
represented by way of example in the accompanying drawings the insulating
envelope or casing being shown as extending only over part of the length of
the conductor so as to expose the coiled enveloping wire.
According to this invention a conductor a of copper or the like is wound with
as a rule, comparatively thin secondary wire 6 which is in any suitable manner

page_text: insulated from external influences say by being "spun" around with silk and
is wound on the main conductor spirally or in helical convolutions the conductor
together with the wire so wound round it being then provided with a suitable
protective casing such as e preferably of a "spun" paper band or strip.
The secondary or enveloping wire should preferably be iron or steel though
it may be made of any other suitable metal.
It has the effect of protecting the conductor proper a from disturbance by
induction which it has the power of keeping at a distance as it were, or neu-
tralising, any induced currents being rendered innocuous in the iron, steel or
other metal of the secondary wire in the condition of gyrating currents.
An essential point in this connection is that the enveloping wire is not applied
to the conductor proper as one connected conducting wire extending throughout
the length thereof but that it is interrupted at predetermined intervals so as
to prevent the transmission or propagation of induced electric currents.;
The enveloping of the conductor with the insulated secondary wire between
the convolutions or coils of which a predetermined space is left free, has the
further effect that in conjunction with the paper casing which surrounds it, it
provides air spaces the presence of which is a desirable fundamental condition in
regard to the insulation of telephone conductors.
It has been attempted before now to attain this result by winding wires with
paper strips rolled into tubes or similar material affording hollow spaces.
By adopting the mode of construction herein described, telephone conducting
cables of every description may be manufactured.
Individual conductors constructed on this system may be combined with each
other and with one common casing, and if necessary they may be further sur-
rounded with a lead casing.
As far as the ultimate effect is concerned it is of course immaterial whether the
insulating layer consisting of either silk, cotton, paint or the like, covers the
conductor proper or the enveloping wire.
The advantage of the novel method of construction of telephone conductors
in any case resides in the fact that the transmission of sound may thereby be
carried to far greater distances than it could be done by means of conductors
as manufactured hitherto and further that in conjunction with such a conductor
the earth may be utilised as a return conductor.
By such means one half of the usual number of conductors as compared with
the ordinary double conductor system is saved.
The further treatment and connection of such conductors with cables are
effected in the usual manner any suitable armouring and protective casings being
applicable.
Having now particularly described and ascertained the nature of the said'
invention and in what manner the same is to be performed we declare that what
we claim is:-
A non-inducible conductor for telephone systems the main feature of which
is that the conductor is surrounded with iron, steel, or other metal wire wound
around it spirally and broken at points situated at pre-determined distances apart,
whereby the currents induced in the iron steel or other metal in the condition
of gyrating currents are rendered innocuous substantially as herein shown and
described.
WHITE & WOODINGTON,
Birkbeck Bank Chambers, Southampton Buildings, London, Agents.