Induction Coil. Page: 2 of 3
[2], 1 p. : ill. ; 23 cm.View a full description of this patent.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
UNITED STATES PATENT OFFICE.
FRED. II. BROWN, OF FORT WORTH, TEXAS, ASSIGNOR TO TIIE MAGNETO
TELEGRAPH COMPANY, OF NEW YORK.
INDUCTION-COIL.
SPECIFICATION forming part of Letters Patent No. 404,822, clatecl June 11, 1889.
Application filed September 23, 1885, Serial No, 177,932, (No model,)To alZl , oot it 7vy con er'7b:
Be it known that I, FRED. I. BROWN, a citi-
zen of the United States, and a resident of Fort
Worth, Tarrant county, State of Texas, have
5 invented a new and useful Improvement in
Induction-Coils, of which the following is a
specification.
My invention relates to an improvement in
induction-coils; and it consists in the construe-
ro tion and arrangement of the parts thereof,
which will be more full5 hereinafter described,
and pointed out in the claims.
The annexed drawing is a diagram of a
transmitter having my improved form of in-
15 duection-coil connected in circuit therewith.
A represents a transmitter having the dia-
phragm B, provided with the carbon button
C, and the pendulum-bar D, provided with
the carbon contact-button E.
20 Z represents the induction-coil, the core a
of which is made of fine annealed soft-iron
wires, and is bent in U or horseshoe shape,
as shown. On the arms of the core are wound
the usual primary coil p and the secondary
25 coil s. The ends of the primary coil are con-
nected in circuit with the carbon contact-
button and diaphragm of the transmitter, and
with a battery e to magnetize the soft-iron
core by passing the electric current through
30 the primary coil around the core; and the ends
of the secondary coil, in which a current of
electricity is induced, are connected in cir-
cuit with a receiving telephonic instrument
f. An armature b, which is made of soft iron,
35 is connected to one pole of the core at one
end, and the other end of the armature ex-
tends over the opposite pole of the core, and
has a brass set-screw d,. the end of which
bears on the disconnected pole of the core.
40 By turning this screw the armature may be
caused either to bear directly on the pole of
the core, so as to connect both poles thereof
in magnetic circuit, or the free end of the
armature may be disconnected from the core,
45 so as to break the magnetic circuit, or the
armature may be brought nearly in contact
with the disconnected pole of the core or re-
moved to a considerable distance therefrom.
By this construction it will be readily seen
50 that the core is provided with means for bring-
ing its poles together to close the magneticcircuit or separating them to any desired ex-
tent.
The strength of the induced currents de-
pends upon the number of convolutions of 55
wire wound within the magnetic field, the
strength of the battery, and the degree of vi-
bration of the transmitting-diaphragm. It
also depends, to a great extent, upon the de-
gree of saturation or magnetic tension of the 60
magnet, and I learn from experiment that a
given strength of current in the primary coil
will induce a greater strength of current in
the secondary coil, if the core of the electro-
magnet is bent so as to have its poles oppo- 65
site each other, than if the core be straight or
bar-shaped, as has heretofore been customary
in this class of instruments. I learn, further,
that by bringing the poles of the core toward
or from each other the intensity of the mag- 70
net is increased or diminished, accordingly as
the poles approach or recede from each other.
In other words, the inductive capacity of the
magnet is proportioned to the nearness of its
poles, and as the intensity or strength of the 75
induced currents is as the strength of the
magnet I regulate the strength of the current
by bringing the extended pole or armature of
the magnet nearer to or farther away from the
other, and am thus enabled to proportion the o80
strength of the current to the distance be-
tween the transmitter and the receiver, and
to other varying conditions.
Changes of atmospheric conditions-such
as from dry to humid, &c.-sensibly affect the 85
operation of speaking-telephones, and it is
frequently found that a telephone which will
readily respond to the voice of one person will
operate with but indifferent success for an-
other person having a differently-pitched 90
voice. A great many other conditions affect
telephonic transmission, such as slight varia-
tions in the strength of the voltaic primary
current and variations in the resistance of
the circuit. Against these contingencies itis 95
the object of myinvention to provide, atleast
in a measure, and this I do by regulating the
strength of the secondary or induced currents
by means of my peculiar form of induction-
coil, as hereinbefore fully pointed out. zoo
having thus described my invention, I
claim-
Upcoming Pages
Here’s what’s next.
Search Inside
This patent can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Patent.
Brown, Fred H. Induction Coil., patent, June 11, 1889; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth172069/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.