Improvements in the Manufacture of Submarine Telegraph and Telephone Cables.
Year: 1898

page_text: Date of Application, 4th Mar., 1898
Complete Specification Left, 27th July, 1898-Accepted, 10th Dec., 1898
Improvements in the Manufacture of Submarine Telegraph and
Telephone Cables.
We, W. T. HENLEY'S TELEGRAPH WORKS COMPANY LIMITED, and GEORGE
SUTTON, Managing Director, both of 27, Martin's Lane, Cannon Street, in the
City of London, and LUDWIG LEHMANN HARTVIGSON, of 59, Heathland Road,
Stoke Newington, London, N., Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the protection of deep-sea cables from injury by trawling
gear catching in the cable when laid on the sea-bed and so breaking the cable or
damaging the insulating covering to such an extent as to impair the electrical
qualities of the cable.
The invention consists in armouring a deep-sea cable with a protective covering
formed of two superposed windings of galvanized steel or iron tape wound in a
short lay with open joints between the convolutions so as to avoid, as far as
possible, interfering with the necessary flexibility of the cable, the second winding
of steel or iron tape enclosing the joints between the convolutions of the first and
so completing the protection of the insulating covering. This armouring of
galvanized steel tape is in turn served with tarred yarn and finally with the usual
compound to give a smooth surface and prevent the coils of the cable adhering
to each other when coiled away in the tank before the cable is laid.
Dated this 4th day of March 1898.
A. M. & WM. OLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
Improvements in the Manufacture of Submarine Telegraph and
Telephone Cables.
We, W. T. HENLEY'S TELEGRAPH WORKS COMPANY LIMITED, and GEORGE
SUTTON, Managing Director, both of 27, Martin's Lane, Cannon Street, in the
City of London, and LUDWIG LEHMANN HARTVIGSON, of 59, Heathland Road,
Stoke Newington, London, N., 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:-
This invention relates to the protection of submarine cables from injury by
trawling gear anchors &c. catching in the cable when laid on the sea-bed and so
damaging or breaking the cable.

page_text: The invention is illustrated in the accompanying drawing wherein Figure 1 is
a longitudinal view of a portion of a cable, each of its component members being
partially stripped, and Figure 2 is a cross section, these views being shewn in
the original drawing to about double full size. In these figures a is the conductor,
the gutta-percha or other insulating material, the wire sheathing, and ac servings
of yarn as usual.
The invention consists in armouring a submarine cable with a protective cover-
ing formed of two superposed windings f g of galvanized iron or steel tape each
wound in a short lay with spaces h between the convolutions so as to avoid interfer-
ing with the flexibility necessary to allow of the cable being coiled in the tanks
and laid with the usual facility. The two strips of metallic tape f g are wound
simultaneously by the usual machinery, the second winding g being wound the
same hand as the first winding f and being superposed thereon so as to cover the
spaces between the convolutions of the first winding f and thus completely enclose
and protect the cable.
It is preferred to use metallic tape about 1 inch wide and of a thickness corre-
sponding to No. 19 B.W.G. and to wind it at a pitch of about 2 inches leaving a
narrow gap or interval between successive convolutions, but it is to be understood
that these dimensions are subject to variation according to the size of the cable
and are merely given as examples, and that the invention claimed is in nowise
mited thereto.
The armouring of galvanized iron or steel tape above described is in turn covered
with a serving of tarred yarn and finally with the usual compound to give a
smooth surface. When a spool of the metallic tape is exhausted and a new one
commenced, the lengths of tape are joined end to end by brazing or welding in the
same way as the wires, so as to form a continuous winding.
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:-
The combination with a submarine cable, of a protective armouring formed of two
open windings of galvanized iron or steel tape, the second winding covering the
intervals between the convolutions of the first substantially as and for the purpose
specified.
0741 love of Lu.1., 1808