An Improvement in Field Telephone and other Cables.
Year: 1897

page_text: Date of Application, 21st Oct., 1897
Complete Specification Left, 21st July, 1898-Accepted, 27th Aug., 1898
An Improvement in Field Telephone and other Cables.
We, WILLIAM HENRY NICHOLS (Engineer), and W. T. HENLEY'S TELEGRAPH
WORKS COMPANY LIMITED, both of 27, Martin's Lane, Cannon Street, in the City
of London, do hereby declare the nature of this invention to be as follows:-
-
This invention relates to the armouring of cables for use with a field telephone
or field telegraph or for other purposes, the purpose of the armouring being to
protect the insulating material enclosing the conductor from injury in consequence
of the rough usage to which the cable is exposed in the field the external armour-
ing also forming the return conductor.
The objects of the improved armouring are to obtain a greater degree of electrical
conductivity; to lessen the liability of the continuity of the circuit being inter- .
rupted in consequence of the armouring being cut or broken; to avoid the
possibility of the armouring short-circuiting the current by cutting through the
insulating covering of the cable in consequence of kinks or violent usage; and
to enable a much stronger joint to be made. Heretofore the armouring has been
formed by lapping or coiling wire of ordinary section about the insulating covering
of the inner conductor but the objects in view may be attained much more
perfectly by making the armouring of a spirally coiled tape of flat section and
composed of soft or hard drawn copper, phosphor bronze, galvanized iron, or
other metal. Metallic. tape of this flat section affords greater conductivity for
an equal weight of metal than a wire of round section, presents a broad bearing
surface to contact with the insulating material, and affords a means of making
a strong soldered joint by overlapping the ends of the tape and binding if necessary
with fine wire before soldering.
T: 014 dow of Ostobar 1807
An Improvement in Field Telephone and other Cables.
We, WILLIAM HENRY NICHOLS (Engineer), and W. T. HENLEY'S TELEGRAPH
WORKS COMPANY LIMITED, both of 27, Martin's Lane, Cannon Street, in the City
of London, 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:-
This invention relates to the armouring of cables for use with a field telephone
or field telegraph or for other purposes, the purpose of the armouring being to

page_text: protect the insulating material enclosing the conductor from injury in consequence
of the rough usage to which the cable is exposed in the field, the external armour-
ing also forming the return conductor.
The objects of the improved armouring are to obtain a greater degree of electrical
conductivity; to lessen the liability of the continuity of the circuit being inter-
rupted in consequence of the armouring being cut or broken; to avoid the
possibility of the armouring short-circuiting the current by cutting through the
insulating covering of the cable in consequence of kinks or violent usage; and
to enable a much stronger joint to be made. Heretofore the armouring has been
formed by lapping or coiling wire of ordinary section about the insulating covering
of the inner conductor but the objects in view may be attained much more
perfectly by making the armouring of a helically coiled tape of flat section and
composed of soft or hard drawn copper, phosphor bronze, galvanized iron, or
other metal. Metallic tape of this flat section affords greater conductivity for
an equal weight of metal than a wire of round section, presents a broad bearing
surface to contact with the insulating material, and affords a means of making
a strong soldered joint by overlapping the ends of the tape and binding, if necessary
with fine wire before soldering.
Such an armouring is illustrated in the accompanying drawing forming part of
this specification. Wherein a portion of cable is represented on a considerably
enlarged scale. a are the ordinary inner conducting wires, 6 the rubber insula-
tion, the braided covering for same, and d the armouring formed of a single
coil of copper or other metal tape of a thickness corresponding to about No. 33,
B. W. G. and a width of about 32nds of an inch helically wound about the braided
covering with an interval of about 3rds of the width of the strip intervening
between the convolutions. Although these dimensions are indicated as suitable
they may be varied according to circumstances without departing from the inven-
tion. The armouring is in any case continuous from end to end of the cable and
would be suitably connected to the instruments in order that it may serve the
purpose of the return conductor.
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:-
A cable for field telephone, field telegraph or other purposes having an armour-
ing of flat metal tape helically wound upon the insulating covering and adapted
to form the return conductor, substantially as specified.
Dated this ISL
day of July Love.
A. M. & WM. CLARK,
Chartered Patent Agents,
53, Chancery Lane, London.
A. M. & WM. CLARK,
Chartered Patent Agents,
53, Chancery Lane, London.