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

page_text: PROVISIONAL SPECIFICATION.
We, LUCIEN GAULARD, and JOHN DIXON GIBBS, both of 18 Warwick Street,
Regent 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 OF INDUCED CURRENTS OF ELECTRICITY to be as follows :—
Our Invention has for its object to construct coils for producing induced currents
of electricity in such a manner that whilst they are readily and cheaply made
they present a large surface and can be readily connected up according to the
requirements of the secondary circuits.
According to our Invention we form the conductor for the primary current and
the conductor in which the induced current is produced of a series of annular discs
slit across at one part and furnished with ear pieces at either side of the slit the
said ear pieces extending from the outer circumference of the annular discs-The
conductor for the primary current is made up of a series of these annular discs and
the conductor for the induced current is made up of another series of these annular
discs the two series being so interlaced that the convolutions of the helix formed
by the discs for the primary circuit alternate with the convolutions of the helix
formed by the discs of the induced circuit-An annular disc of insulating material
is placed between each convolution of the double helix thus formed and the ear
pieces of all the discs for the primary current are soldered or electrically connected
together and the ear pieces of all the alternate discs for the induced current are
similarly soldered or electrically connected together. The double helix thus formed.
can be provided with an iron core and completed as in ordinary induction coils. The
induced current can be collected and utilized by connecting the secondary circuit
wires to the secondary circuit helix, in accordance with the requirements of the
apparatus of consumption.
Dated this 19th day of Febrery 1884
J. HENRY JOHNSON,
Agent for the said Lucien Gaulard
and John Dixon Gibbs.

page_text: We LUCIEN GAULARD and JOHN DIXON GIBBS both of 18 Warwick Street
Regent Street in the County of Middlesex do hereby declare the nature of this
invention for "IMPROVEMENTS IN THE CONSTRUCTION OF COILS OR APPARATUS
FOR THE PRODUCTION OF INDUCED CURRENTS OF ELECTRICITY" and in what mannėr
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
Our Invention has for its object to construct coils for producing induced currents
of electricity in such a manner that whilst they are readily and cheaply made
they present a large surface and can be readily connected up according to the
requirements of the secondary circuits.
According to our Invention we form the conductor for the primary current and
the conductor in which the induced current is produced of a series of annular discs
"slit across at one part and furnished with ear pieces at either side of the slit, the
said ear pieces extending from the outer circumference of the annular discs-The
conductor for the primary current is made up of a series of these annular discs, and
the conductor for the induced current is made up of another series of these annular
discs the two series being so interlaced that the convolutions of the helix formed
by the discs for the primary circuit alternate with the convolutions of the helix
formed by the discs of the induced circuit. An annular disc of insulating material
is placed between each convolution of the double helix thus formed, and the ear
pieces of all the discs for the primary current are soldered or electrically connected
together, and the ear pieces of all the alternate discs for the induced current are
similarly soldered or electrically connected together-The double helix thus formed
can be provided with an iron core and completed as in ordinary induction coils
The induced current can be collected and utilized by connecting the secondary
circuit wires to the secondary circuit helix in accordance with the requirements of
the apparatus of consumption.
And in order that our said Invention may be fully understood we shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed drawings the same letters of reference indicating
corresponding parts in all the figures.
Figure 1 is a side elevation partly in section of an induction or secondary coil
constructed according to our Invention Figures 2 and 3 represent respectively an
edge view and a plan of one of the annular discs of copper or other suitable
conducting material of which the coil is composed-Figures 4 and 5 are respectively
a side elevation and a plan of a double helix formed by connecting a number of
the annular discs together.
The annular conducting discs A are divided at one part or provided with an
opening or space as shewn at a, and on each side of this opening and extending
outside the outer circumference of the disc, are ears or projecting pieces a¹ a³ by
means of which the several discs are connected together to form a helix.
In constructing an induction or secondary coil according to the Invention two
helices of conducting material are combined as shewn by the full lines and the
dotted lines in Figures 4 and 5-In connecting the said discs to form the coils the
following may be the mode of proceeding-Two of the conducting. discs are placed
the one on top of the other as shewn at 12 Figure 4.
One of the ears or projections of the upper disc is arranged between the ears or
projections on the lower disc-Above the disc 2 is placed another conducting disc 3
so that say the right hand ear or projection is over the left hand ear or projection

page_text: of the disc 1. Over this disc 3 another conducting disc 4 is placed so that say the
right hand ear or projection thereon is over the left hand ear or projection of the
disc 2 and in this manner any desired number of conducting discs may be
connected together each conducting disc added to the pile being connected to one of
the projections on the disc next but one below it, as will be seen clearly by
referring to Figure 4-The ears or projections which overlie each other are
electrically connected by solder or otherwise. A disc of insulating material, such
for example as paraffined cardboard, is interposed between the adjacent conducting
discs One of these discs is shewn in Figure 6-The discs connected together in
the manner described form two separate helices as shewn respectively by the full
lines and the dotted lines in Figure 4 the several convolutions of the helices being
insulated from each other by the discs of insulating material-In forming the
secondary coils they may be compacted together between two surfaces E E by bolts
or screwed rods and nuts F as shewn in Figure 1, the projections or ears by which
the several conducting discs are connected, projecting helically or spirally around
the coil (the ears of the primary coil alternating with those of the secondary coil)
and form convenient means for connecting up any number of convolutions as
required.
The end discs of one of the helices thus formed are connected to the leads of the
primary circuit by binding screws at G G¹ and the end discs of the other helix are
similarly connected at H H to the leads for the induced or secondary current-
The interposed discs of paraffined card board or other insulating material, prevent
short circuiting between the helices and the several convolutions thereof, but
instead of using discs of insulating material for the purpose the conducting discs
either before or after they are conneted together may be coated with varnish
or with other suitable insulating material. I Figure 1 is a hollow cylinder of
paraffined cardboard or other suitable insulating material, round which the helices
are arranged, and in this cylinder is a core K of soft iron, or soft iron wires which
is capable of being raised and lowered in the cylinder so as to regulate as required
the current passing through the coil.
•
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 secondary coils or apparatus for the production of induced
currents of electricity of divided discs of copper or other conducting material with
ears or projecting pieces or equivalent means of connection, the said discs being
connected up to form helices arranged together and situated with their width or
flat surface at or about right angles to the axis of the coil, substantially as and for
the purposes hereinbefore described.