Year: 1887

page_text: Date of Application, 28th Apr., 1887
Complete Left, 27th Feb., 1888
Complete Accepted, 20th Apr., 1888
I, WILLIAM JOHN MULLER of 58 Dean Street, Soho, London, in the County of
Middlesex, Electrician, do hereby declare the naturo of this invention to be as
follows:-
The object of my invention is to obtain greater inductive effects than have hitherto
been accomplished. The induction coils at present constructed consist of a cylindrical
bobbin having a central iron core surrounded first, by a short inner coil of stout wire
called the primary coil, and then by a coil of fine wire of a considerable length, called
the secondary coil, which is wound round the primary coil and carefully insulated
therefrom. In coils so constructed the outer layers of the wire of the secondary coil
are less influenced by the electro-magnet than the layers next to it. To obviate this
and to produce the greatest efficiency I construct my coil or transformer as follows:-
I take a coil of the usual type as herein before described, and outside the secondary
coil thereof I wind another primary coil, outside of which I lay-parallel with the
core a series of iron wires, forming a second core outside the second primary coil.
Thus I have two primary coils, and two iron cores influencing the secondary coil,
which produces greater inductiveness than one primary coil alone. The two primary
coils are connected together in such a manner that when a current is passed through,
an uniform magnetic field is produced.
The primary coils may consist of two or more layers, the outside wire being stouter
than the inner one, and of greater length.
I prefer to wind the secondary coil by the disc method, and I sometimes wind
another layer or layers on the outside core to intensify the magnetization of the iron
core,
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
Royal Courts Chambers,
70, Chancery Lane, London, W.C.,
Agent for the Applicant.

page_text: Improvements in Induction Coils and Transformers.
I, WILLIAM JOHN MULLER of 58 Dean Street Soho, London, in the county of
Middlesex, Electrician, 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 :-
The object of my invention is to obtain greater inductive effects than have hitherto
been accomplished. The induction coils at present constructed consist of a cylindrical
bobbin having a central iron core surrounded first, by a short inner coil of stout wire
called the primary coil, and then by a coil of fine wire of a considerable length, called
the secondary coil, which is wound round the primary coil and carefully insulated
therefrom. In coils so constructed the outer layers of the wire of the secondary coil
are less influenced by the electro-magnet than the layer next to it. To obviate this
and to produce the greatest efficiency I construct my coil or transformer as follows:-
I take a coil of the usual type as hereinbefore described, and outside the secondary
coil thereof I wind another primary coil, outside of which I lay parallel with the core,
a series of iron wires, forming a second core outside the second primary coil. Thus I
have two primary coils, and two iron cores influencing the secondary coil, which
produces greater inductiveness than one primary coil alone.
The primary coils may consist of two or more layers, the outside wire being
preferably stouter than the inner one; when large quantities of wire are to be induced
I prefer to wind the wire of the secondary coil by the disc method, and I sometimes
wind another layer or layers on the outside core to intensify the magnetization of the
iron core.
The two primary coils are wound and connected together in such a manner that
when a current is passed through both coils, a uniform magnetic field is produced.
In the accompanying drawing Figure 1. is a view in side elevation-in section-
showing the construction of my improved coil and Figure 2 is a cross section thereof.
Figures 3, 4, 5 and 6 are diagram views showing various methods of winding and
connecting the primary coils.
Throughout the several views similar parts are marked with like letters of
reference.
Referring to Figures 1 and 2 A designates the central iron core, preferably made
of a series of iron wires. B the bobbin on which the first primary coil C is wound,
D designates the secondary coil and d the leads thereof. Cf the second primary coil,
A¹ the second iron core preferably formed of a series of iron wires placed parallel with
the central iron core A, and X designates insulation round or between the various
cores or coils.
The primary coils C and C¹ may be wound and connected in any of the following
manners. First, both coils may be wound in the same direction either right-handed
as shown by Figures 3 and 4 of the accompanying, or vice versa; that is to say, left-
handed. When the primary coils are so wound I either connect the end of the coil C

page_text: to the beginning of the coil C₁ as illustrated by Figure 3 of the accompanying
drawing, or I connect the ends of the coil C to the approximate ends of the coils C¹ as
illustrated by Figure 4 of the accompanying drawing.
Secondly: the coil C may be wound right-handed, and the coil Cleft-handed, as
illustrated by Figures 5 and 6 of the accompanying drawing, or vice versa. When
the coils are so wound I either connect the end of the coil C to the end of the coil C¹
as illustrated by Figure 5 of the accompanying drawing, or I connect together the
opposite ends of the respective coils and Cas illustrated by Figure 6 of the
accompanying drawing.
I do not limit myself to the cylindrical shape of the cores or coils as they may be
made any other suitable shapes other than round.
It will be obvious that the number of layers in each primary coil may be varied as
required for the particular purpose for which the coil is intended to be used, and also
that separate sources of electricity may be employed for the primaries as desired.
It may sometimes be advantageous to use another secondary coil outside the second
core, in which case I interpose another primary coil between the said secondary coil
and the second core.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. An induction coil or transformer constructed, arranged and operating as and for
the purpose herein before set forth.
2. In an induction coil or transformer, the use of second primary coils and cores,
the former of which are wound and connected together, as and for the purpose
herein before set forth.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
Royal Courts Chambers,
70, Chancery Lane, London, W.C.,
Agent for the Applicant.
Daton this on day of coruary 100p.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
Royal Courts Chambers,
70, Chancery Lane, London, W.C.,
Agent for the Applicant.

page_text: FIG. 3.
500000
FIG.4.
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ومدعم
FIG. 5.
FIG. 6.
C'
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