Improvements in Electric Conductors.
Year: 1892

page_text: Date of Application, 23rd Nov., 1892.
Complete Specification Left, 14th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Electric Conductors.
I, HENRY EDMUNDS of 39 Victoria Street in the City of Westminster,
Electrical Engineer do hereby declare the nature of my invention to be
follows:-
as
In electric conductors for alternating currents it is known that it is beneficial to
employ a tubular conductor. These conductors however, have hitherto been made
of solid metal, like a metal pipe, and have presented the disadvantage that they are
practically inflexible. According to my invention I form a tubular conductor by
plaiting, or otherwise interlacing, or combining wires into the form of a tube. This
tube may be insulated in the ordinary or any convenient manner and may be
combined with other conductors either of the same, or of different, construction to
constitute single or concentric cables for instance there may be a tubular conductor,
constructed as described and insulated with a central conductor or strand of the
ordinary kind; or there may be two or more insulated tubular conductors, con-
structed as described or there may be for the current in one direction a solid
unstranded conductor insulated and surrounded by a tubular insulated conductor
constructed as described and of equivalent carrying capacity to that of the other
conductor this tubular conductor being for the current in the other direction, or
there may be for the current in one direction a tubular insulated conductor or
conductors constructed as described and with or without a centre conductor or strand,
the said conductor or conductors being surrounded by another insulated tubular
conductor or conductors or a conductor or conductors helically wound round for the
current in the other direction.
The quantity and size of the wires used are of course determined by the required
carrying capacity of the cables.
Dated the 23rd day of November 1892.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION..
Improvements in Electric Conductors.
I, HENRY EDMUNDS of 39 Victoria Street in the City of Westminster,
Electrical Engineer, 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 :-
In electric conductors for alternating currents it is known that it is beneficial to
employ a tubular conductor. These conductors, however have hitherto been made of
solid metal, like a metal pipe and have presented the disadvantage that they are
practically inflexible.
According to my invention I form a tubular conductor by plaiting, or otherwise
interlacing, or combining, wires into the form of a tube. This tube may be
insulated in the ordinary, or any convenient, manner, and may be combined with
other conductors, either of the same, or of different, construction, to constitute
single or concentric, or multiple, cables; for instance, there may be a tubular
conductor, constructed as described and insulated with a central conductor, or
strand, of the ordinary kind; or there may be two, or more, insulated tubular
conductors, constructed as described; or there may be, for the current in one
direction, a solid unstranded conductor, insulated, and surrounded by a.tubular

page_text: insulated conductor, constructed as described, and of equivalent carrying capacity
to that of the other conductor, this.tubular conductor being for the current in the
other direction; or there may be, for. the current in one direction, a tubular
insulated conductor, or conductors, constructed as described, and with, or without,
a centre conductor, or strand, the said conductor; or conductors, being surrounded
by another insulated tubular conductor, or.conductors, or.a conductor, or conductors,
helically wound round for the current in the other direction.
The quantity, and size, of the wires used are of course determined' by the required
carrying capacity of the cables.
Figure 1 of the accompanying drawing represents a conductor a constructed
according to my invention. The wires are shewn as being plaited together into a
tubular form, and insulated as shewn at b.
Figure 2 shews a concentric cable made by
Figure 3 shews a conductor a, like that
conductor, or strand, c, of the ordinary kind.
if desired.
combining two such conductors a a.
shewn in Figure 1, with a central
This latter may be a solid conductor
Figure 4 shews a conductor a, like that shewn in Figure 1 surrounded by a
helically wound conductor d.
Figure 5 shews an arrangement similar to Figure 4 but with another insulation
outside and then an external braiding as in Figure 2.
In all the Figures the insulation is marked b.
In the expression wires I include wires, or strips, of any shape in cross section
which will allow of their being plaited, or otherwise interlaced, or intertwined,
substantially as hereinbefore described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
An electric conductor made by plaiting, or otherwise interlacing, or intertwining,
wires, or the like, into tubular form, whether used alone or in combination with
other conductors similarly, or otherwise, formed; and also the particular forms, or
constructions, of electric conductors, herein before described and shewn in the
accompanying drawings.
Dated this 14th day of September 1893.
J. H. JOHNSON & Co.,
Agents.