IMPROVEMENTS IN THE CONSTRUCTION OF COILS OR APPARATUS FOR THE PRODUCTION AND PASSAGE OF CURRENTS OF ELECTRICITY
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We, LUCIEN GAULARD Engineer and Chemist, and JOHN DIXON GIBBS Esquire
both of 18 Warwick Street Regents Street in the County of Middlesex do hereby
declare the nature of said Invention for "IMPROVEMENTS IN THE CONSTRUCTION
OF COILS OR APPARATUS FOR THE PRODUCTION AND PASSAGE OF CURRENTS OF
ELECTRICITY" to be as follows:→
Our Invention has for its principal object to produce coils for dynamo electrical
machines in such a manner as to obtain a more effective action of the same and
also so that the said coils can be constructed very readily and with great economy
in first cost and time of production-The Invention is applicable to the construc-
tion of coils for primary currents generally.
Our said Invention consists in forming the said coils of annular discs with
projecting lugs or ear pieces as described in the Provisional Specification lodged on
the 12 February 1884 with our application for Letters Patent No 3173 as applied
to the production of Secondary Coils but in place of using a double helix as there
described we use a coil only for the primary current. We form the discs each with
two lugs or ear pieces at either side of a slit in the said discs and extending from
the outer circumference thereof.
The lugs or ear pieces may be nearly close together instead of at such a distance
apart as to give space for the cars of the additional coil as is necessary in making
the secondary coils. The cars of the respective discs are electrically connected by
solder or otherwise in such a manner that when all of the discs are connected
together they form a continuous helix a layer of nonconducting material being
placed between each convolution.
The coils thus formed can be used for the armatures and the fields of dynamo
machines and for coils for primary currents generally and for all electro magnets.
Dated the 19th dose of a 1984
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, W.C.,
Agent for the said Lucien Gaulard
and John Dixon Gibbs.

page_text: We LUCIEN GAULARD and JOHN DIXON GIBBS both of 18 Warwick Street
in the County of Middlesex do hereby declare the nature of our invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF COILS OR APPARATUS FOR THE
PRODUCTION AND PASSAGE OF CURRENTS OF ELECTRICITY" and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
Our Invention has for its principal object-to-produce coils for dynamo-electrical
_machines-in-such a manner as to obtain a moro effective action of the same and
also so that the said coils can be constructed very readily and with great economy
in first cost and time of production but the Invention-is not limited to the making
of coils for dynamo electrical machines as it is applicable to the construction-of-
single coils or coils for primary-currents generally.
Our said Invention consists in forming the said coils of annular discs with
projecting lugs.or-car-pieces as described in the Specification of our application for
Letters Patent No 3173 dated the 12th February 1884-as-applied to the production
of double or secondary coils but in place of using a double helix as there described
we use a single coil only for the one current. We form the discs each with two
lugs or ear pieces at either side of a slit in the said discs and extending from the
outer circumference thereof.
The lugs or ear pieces may be nearly close together instead of at such a distance
apart as to give space for the cars of the additional coil as is necessary in making
the double or secondary coils. The ears of the respective discs are electrically con-
nected by solder or otherwise in such a manner that when all of the discs are
connected together they form a continuous helix a layer of nonconducting material
, being placed between each convolution,
The coils thus formed can be used for the armatures and the fields of dynamo
machines and for single coils or coils for primary currents generally and for example
as for the coils of electro magnets.
In the accompanying drawing Figure 1 represents one of the annular discs of
which a coil constructed according to our Invention is made up each disc being
slit at a and having lugs or projections a¹ a². Figure 2 shews how these annular
discs are joined up into a helical form to constitute a coil by soldering or otherwise
electrically connecting the lug a¹ of one disc to the lug a² of the next disc and so
on with any number of discs that may be needed to form a coil having the
required number of convolutions. The convolutions may be insulated from each
other by varnish or 'paper or any other suitable substance. This insulating
material may be in the form of rings interposed between each convolution or it may
be made into a belix by forming and connecting up discs of insulating material as
described with regard to the conducting discs.
"
The coils made according to this Invention may of course be electrically con-
nected to the external circuit or line or otherwise in any desired or customary way
of making such connections.

page_text: Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
The construction of coils for dynamo electrical machines electro-magnets and
the like single or primary coils by means of discs formed and connected up to
constitute a helix or coil substantially as herein before described and illustrated in
the accompanying drawing.
LUCIEN GAULARD.
J. DIXON GIBBS.