Year: 1887

page_text: Date of Application, 25th May, 1887
Complete Left, 27th Feb., 1888
Complete Accepted, 27th Apr., 1888
We WILLIAM MORRIS MORDEY Electrician and CHARLES EDMUND WEBBER,
C.B. Major-General, R.E. both of Victoria Works, Belvedere Road, in the County of
Surrey do hereby declare the nature of this Invention to be as follows:-
This Invention relates to improvements in electric transformers, or induction coils,
and inductional resistance coils, and has for its object to so construct such apparatus
that they are inexpensive, simple, and efficient, and capable of being readily constructed
and easily separated to allow of the removal of the coil or coils for examination or
repair, and the Invention consists mainly in arrangements by which the iron and
copper portions of the transformer may be separately and independently constructed
without any interweaving of one with the other.
In one form of our improved transformer the primary and secondary coils are
arranged as described in the Specification of our application for Patent No. 691787 of
long coils preferably in the form of a link. Thin sheet iron E shaped pieces are then
placed side by side separated electrically and firmly held, or clamped, together. If
bolts and nuts be used it is preferred that they should not pass through holes in the
iron E pieces. At intervals air spaces may be left for ventilation. Two sets of
E pieces so constructed are then placed together so that the projecting pieces meet,
the middle ones meeting through the centre of the coils, and the outer ones meeting
on the outside of the coils. The two sets thus placed are held in contact in any
convenient manner.
The pieces may be stamped from sheet iron and be all of one size, the faces of the
projections forming flat and even surfaces. Thus when placed together they meet
accurately. To obtain a greater area of opposed surfaces the sets of pieces may be
oppositely serrated, curved or bevelled so that they fit the one into or over the
other.
One set of E pieces only may be used the projections being long enough to cover
three sides of the coils and instead of a second set of E pieces a number of simple
rectangular pieces, placed together in the same manner are laid across the coils and in
contact with the ends of the projecting portions of the E pieces.

page_text: Or the interior of the coils may be filled with a number of simple rectangular pieces
placed side by side as hereinbefore described and at right angles to the sides or main
direction of the winding. A number of Ushaped pieces are placed together in the
same order and are passed over the sides of the coils so as to meet the pieces which
occupy the interior of the coils. Or instead of two sets of U pieces the outer
sheath of iron may consist of a number of pieces each having a hole cut in it. The
coils with a core made as above described aro then inserted into the sheath so
prepared.
In constructing inductional resistance coils we employ the same form of apparatus
as for transformers, but with only one coil of wire.
Dated this 25th day of May 1887
J. H. JOHNSON & Co..
47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: Inductional Resistance Coils.
We WILLIAM MORRIS MORDEY Electrician and CHARLES EDMUND WEBBER C.B.
Major-General R.E. both of Victoria Works Belvedere Road in the County of Surrey
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 improvements in 'electric transformers or induction coils
and inductional resistance coils and has for its object to so construct such apparatus
that they are inexpensive simple and efficient and capable of being readily constructed
and easily separated to allow of the removal of the coil or coils for examination or
repair and the invention consists mainly in arrangements by which the iron and copper
portions of the transformer may be separately or independently constructed without
any interweaving of one with the other.
In one form of our improved transformer the primary and secondary coils are
arranged as described in the Specification of our application for patent No. 6917
of 1887 of long coils preferably in the form of a link but instead of forming the iron
sheath as described in that specification we make it as shewn by figures 1 and 2 of
the annexed drawings by which construction we are enabled to remove the coils for
examination or repair in a shorter time and in an easier manner although at some
sacrifice of efficiency caused by the magnetic contents being less perfect than in the
forms described in our before mentioned Specification.
A
Figure 1 is a plan and Figure 2 a transverse section on the line A. B of Figure 1.
The primary coil P and the secondary coil S are wound and placed as shown.
number of thin sheet iron E shaped pieces E are then placed side by side, separated
electrically, which may be effected by a coating of varnish on one side of each piece
or by the insertion of paper between the pieces and when a sufficient number have
been so placed they are firmly held or clamped together by bolts and nuts b b and end
plates or jaws c c. The plates cc have blocks or extensions c¹¹ which grip the masses
of E pieces and allow space for the end portions of the coils P. S. Two similar masses
of E pieces thus built up and having their tongues or projections arranged to form
even and smooth surfaces are then placed together as shewn in figure 2, the edges of
the middle tongues or projections meeting through the centre or opening of the
coils P. S and the edges of the end tongues or projections meeting on the outsides of
the said coils. Sideplates dd and bolts and nuts 61 61 are then used to hold the two
sets of E pieces firmly in contact. The plates dd may be formed with ribs and
perforations to allow of ready circulation of air over the surfaces of the masses of
E pieces to facilitate the dissipation of heat therefrom.
In order to obtain a greater superficial area of the opposed edges of the E pieces we
sometimes construct them in the manner shewn in Figure 3, that is with the contact

page_text: surfaces oppositely serrated curved or bevelled in other than a straight line so that
they fit against each other. By this means the magnetic resistance of the joint is
reduced. Instead of using two sets of E pieces as in Figures 1. 2 and 3. we may use
the arrangement shewn in Figure 4 where one set of Ĕ pieces only is required, the
completion of the magnetic circuit being made by a number of simple rectangular
pieces placed side by side insulated and held from one another as hereinbefore
described and laid across the coils with an edge in contact with the edges of the
projections or tongues of the E pieces. Or the opening of the coils PS may be filled
by a number of simple rectangular iron pieces gg as shewn in Figures 5 and 6 placed
side by side and insulated as above described at right angles to the main direction of
the winding. A number of U-shaped pieces uu are then placed together in the same
order and manner and passed over the sides of the coils so that their edges meet the
edges of the pieces gg which occupy the interior or opening of the coils P. S. Or
instead of two sets of U-pieces as in Figures 5 and 6 the outer sheath of iron may
consist as shewn in Figure 7 of a number of pieces ✓ each having a rectangular hole
in it. The coils P.S with a core of iron plates g as in Figure 6 are then inserted into
the sheath formed by building up a number of the pieces V into a sort of tube of
rectangular section. In constructing inductional resistance coils we employ the same
form of apparatus as for transformers, but with only one coil of wire. These forms
of apparatus are well adapted to be used for purposes where it is required to readily
vary the amount of induction, as in certain regulating processes, and to this end we
sometimes arrange one or more of the compound iron masses of our transformers so
that by moving it more or less from the position which it occupies in the annexed
Figures the inductive effect is reduced.
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 :-
First. In electric transformers, induction coils or inductional resistance coils the
combination and arrangement of parts wherein the iron plates have meeting or
abutting edges as hereinbefore described and illustrated respectively in Figures 1
and 2, Figure 3, Figure 4, Figure 5, Figure 6, and Figure 7 of the accompanying
drawings.
•
Second. In electric transformers induction coils and inductional assistance coils,
the iron plates E having meeting or abutting edges serrated curved or undulated or
meeting in other than a straight line substantially as and for the purpose herein before
described with reference to Figure 3 of the accompanying drawings.
Dated this 27th day of February 1888.