Improvements in Electric Conductors.
Year: 1889

page_text: Date of Application, 12th June, 1889
Complete Specification Left, 12th Mar., 1890-Accepted, 19th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Electric Conductors.
I, JAMES GRIEVE LORRAIN, of Norfolk House, Norfolk Street, Strand, in the
County of Middlesex, Consulting Engineer and Patent Agent, do hereby declare the
nature of this invention as communicated to me from abroad by La Société
d'Exploitation des Cables Electriques, Système Berthoud, Borel et Compagnie, of
Cortaillod, Canton de Neuchatel, Switzerland, to be as follows:-
This invention as communicated to me by my Foreign Correspondents, relates to
Electric Conductors of a construction specially suitable for currents of high
electromotive force and in which the thickness of the dielectric is reduced to a
minimum.
"
In carrying this invention into effect I take a core of any of the usual forms and
upon this I wind in the same direction of progressive revolution two ribbons of paper
or the like, one of which ribbons is half a width in advance of the other so as to
effect what is known to engineers as breaking joint." Over the covering thus
formed I wind a second serving consisting as before of two ribbons arranged so as
to break joint: but in the case of this serving the direction of winding is the
opposite to that of the winding of the first serving. In this manner I proceed until
a sufficient number of servings has been put on to give the desired thickness of
dielectric. In some cases I vary the material of which the servings are composed.
Thus after putting on one or more layers of paper ribbon I may wind on cotton, linen
or jute tape, fabric or yarn, or the like. I may either after one or a few or
after all the servings have been put ou immerse the conductor, which may when
desired be wound on a special drum for the purpose, in a suitable bath of any
convenient insulating material. Thereafter the conductor may be sheathed with lead,
and if desired be armoured.
T
111 If Tu 1000
J. G. LORRAIN,
Agent for the said Société d'Exploitation des Cables Electriques,
Système Berthoud Borel & Cie.
COMPLETE SPECIFICATION.
Improvements in Electric Conductors.
I, JAMES GRIEVE LORRAIN, M.I.E.E., M.I.M.E., of Norfolk House, Norfolk
Street, Strand, in the County of Middlesex, Consulting Engineer and Patent Agent,
do hereby declare the nature of this invention and in what manner the same is to
be performed (as communicated to me by La Société d'Exploitation des Cables
Electriques, Système Berthoud-Borel et Compagnie), to be particularly described and
ascertained in and by the following statement:-
This invention relates to Electric Conductors which are specially suitable for
currents of high electromotive force and which have the thickness of the dielectric
reduced to a minimum.
In carrying this invention into effect a core of any of the usual forms is taken
and upon this two ribbons of cellulose are wound spirally, that is to say, in tho
same direction of progressive revolution, as is shewn in the accompanying figure in
which a and b are the two ribbons and c the core, the latter consisting in the case
illustrated of a large number of fine wires stranded into a single conductor. One
of these ribbons a, as the figure shows, is half-a-width in advance of the other
ribbon so as to "break joint." Over the covering thus formed a second serving,
consisting as before of two ribbons, arranged so as to break joint, is wound: but
DQ2

page_text: the direction of winding of this serving is the opposite of that of the first serving.
In this manner a sufficient number of servings is wound on the core to give the desired
thickness of dielectric after which a serving of tape, yarn or textile material is added
for the purpose of protecting the layers of cellulose.
The core or conductor thus covered is then plunged into a bath of insulating
material, such for example as that described in the Complete Specification accom-
panying the Letters Patent No. 1516 of the year 1882, heated to a sufficiently high
temperature to expel the whole of the moisture from the servings covering the
core. For the purpose of being plunged into this bath of insulating material the
covered core is preferably first wound upon a drum in the well known manner.
Thereafter the conductor is enveloped in a protecting sheathing of one of the well
known types such for example as a sheathing of lead, or a braiding or arming of
iron wires.
In some cases layers of yarn, textile material or the like may be interposed
between servings of cellulose ribbon; and when desired the conductor may be plunged
into the bath of insulating material at an earlier stage than that herein before mentioned
as well as at the stage specified.
The ribbons herein before mentioned may be of any convenient form of cellulose,
ordinary drawing paper or parchmentised paper answering the purpose admirably.
Having now particularly described and ascertained the nature of this inveu-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I desire it to be understood that what I claim is :-
1. The improvement in electric conductors consisting of a covering or dielectric
substantially as set forth.
2. In the covering or dielectric of an electric conductor the employment of servings
of cellulose ribbon substantially as set forth.
3. In the covering or dielectric. of an electric conductor the employment of
servings of cellulose ribbon, with layers of yarn, textile material or the like interposed,
substantially as set forth.
E
1000
J. G. LORRAIN,
Patent Agent for the said Société d'Exploitation des Cables Electriques,
Système Berthoud-Borel & Compagnie.