Improvements in or connected with Electric Cables.
Year: 1895

page_text: Date of Application, 10th June, 1895
Complete Specification Left, 10th Mar., 1896-Accepted, 11th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in or connected with Electric Cables.
I, HENRY EDMUNDS of 39 Victoria Street in the City of Westminster,
Electrical Engineer do hereby declare the nature of my invention to be as
follows:-
In electric cables enclosed in metallic (usually lead) tube especially such as have
what is known as an insulation the insulation is liable to be destroyed by the
It is the object
leakage of moisture at the joints by which connections are made.
of my invention to provide means whereby this leakage is prevented according to
my invention I provide a plug of metal through which are passed wires corre-
sponding to the number of conductors in cables the said wires being insulated by
rubber or other insulating material impervious to moisture the said insulated wires
projecting on each side of the metal plug. Those projecting from one side are
connected with the conductors from the end of the cable and a metal sleeve is
placed so as to extend from the end of the metal covering of the conductor to the
metal plug and the said sleeve is soldered to the said tube and plug. Where as in.
some concentric cables one (or more) of the conductors is made of compound or
stranded wires the component wires of each such couductor where they leave the
cable can be rolled together so as to constitute the equivalent of a single wire for
attachment to the wires protruding from the plug and to prevent leakage of
moisture between the component wires a part within the plug can be formed solid
for instance by brazing or soldering the component wires together. By providing
the adjacent ends of lengths of cable with the aforesaid device the lengths of wire
protruding from the plugs can be joined together, and will at the place between the
plug form a place for attachment of branch or leading in wires the devices aforesaid
preventing leakage of moisture into the cables.
Plugs and insulated wires therein with the component wires of compound
conductors joined by a solid portion to stay the progress of moisture may be used
at intervals in the length of a cable so that if leakage occurs it will be confined to
a given length of cable.
I do not limit myself to the use of metal for the plug and rubber for the covering
of the wires provided that they afford the requisite insulation between them for
instance the plug may be of glass or earthenware or equivalent material and the
wires embedded therein may be of a metal or alloy having a co-efficient of expansion
equal to that of the material of the plug.
Dated this 10th day of June 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.

page_text: '
I HENRY EDMUNDS of 39 Victoria Street, 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 cables enclosed in a tube (usually a lead tube) especially such as have
what is known as air insulation, the insulation is liable to be destroyed by the
leakage of moisture at the joints by which connections are made. It is the object
of my invention to provide means whereby this leakage is prevented. According
to my invention (in explaining which I will refer to the accompanying drawings)
I provide a plug a through which are passed wires b corresponding to the number
of conductors in the cables the said wires (if metal be used for the plug) being
insulated by rubber or other insulating material c impervious to moisture, the said
insulated wires projecting on each side of the plug. Those projecting from one
side are connected with the conductors d from the end of the cable D and a metal
sleeve E is placed so as to extend from the end of the metal covering of the
cable D to the metal plug a and the said sleeve is soldered or sealed to the said
tube and plug. The other side of the wires from the plug are also shewn as being
similarly connected to a cable F.
In concentric or triple concentric cables or where one or more of the conductors
is or are made of compound or stranded wires, the component wires of each such
conductor where they leave the cable can be laid together so as to constitute the
equivalent of a single wire for attachment to the wires protruding from the plug
and to prevent leakage of moisture between the component wires a part within the
plug can be formed solid for instance by brazing or soldering the component wires
together as illustrated at 9 in Figure 2. By providing the adjacent ends of lengths
of cable with the aforesaid means the lengths of wire protruding from the plugs
can be joined together and will at the portion outside the plug form a place for
attachment of branch or leading wires the devices aforesaid preventing leakage of
moisture into the cables. Plugs and insulated wires therein with the component
wires of compound conductors.joined by a solid portion to stay the progress of
moisture may be used at intervals in the length of a cable so that if leakage occur
it will be confined to a given length of cable. I may use metal for the plug and
rubber for the covering of the wires but I may use any other substances provided
that they afford the requisite insulation between them, for instance the plug may
be of glass or earthenware or of unvulcanized rubber vulcanizing being afterwards
effected by the application of heat; or any equivalent material may be used and
the wires embedded therein may be of a metal or alloy having a coefficient of
expansion equal to that of the material of the plug.
The insulating of the wires and the formation and application of the plug may be
effected in various ways for example by applying rubber to the ends of the wires
and then applying a wrapping or covering of. rubber again to these so as to form a
plug and then after securing the plug in place as described effecting vulcanizing by
any suitable or known means.
Or the ends of the wires may be dipped in an insulating material or enamel and
tben metal may be cast around to form the plug.
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:-
:-
1. In connection with electric cables a plug through which conducting wires are
passed substantially as herein before described.

page_text: 2. In connection with electric cables a plug through which conductors are passed
the said conductors having their component wires brazed together or formed into a
solid part at the portion within the plug substantially as herein before described.
3. In connection with electric cables a plug with connecting conductors or wires
passing therethrough and forming a connection between cables and connected to the
covering thereof by a sleeve substantially as hereinbefore described.
Dated this 10th day of March 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.