IMPROVEMENTS IN RECEIVING TELEPHONES
Year: 1884

page_text: I JOHN HENRY JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS
IN RECEIVING TELEPHONES" which has been communicated to me from abroad by
James Aloysius Maloney of Washington District of Columbia in the United States
of America to be as follows:-
This Invention relates to the kind of receiving telephone in which are combined
a magnet a non-magnetic diaphragm and a reed-like armature fastened to the
diaphragm and the object of this Invention is to obtain a simple and efficient
instrument of this kind it being characterized by the combination with the magnet
and the non-magnetic diaphragm of a special form of armature which for convenience
sake I term a "multiple-reed armature, the said armature being opposite the pole
or poles" of the magnet and consisting of two or more reeds or strips which have
their free ends opposed to, and separated by a short interval from one another, and
are formed in one with a supporting plate which is fastened tightly to the
diaphragm.
What is essential is that there should be free ends constituting tongues or reeds
which are opposed to and separated by a short interval from one another and that
these opposed tongues or reeds should be carried by or formed in one with a
supporting strip or plate common to both. I prefer to slot longitudinally each free
end so as to form two reeds of each. But the ends may be unslotted in which case
each of them will constitute but a single reed; and on the other hand more than
one longitudinal slot may be formed in them in which case cach would consist
of more than two reeds or tongues. But in any event the free extremity or
extremities of the reed or reeds would be opposed to or opposite the other or
others.
0
1004

page_text: I, JOHN HENRY JOHNSON, of 47 Lincolns Inn Fields, in the County of Middlesex,
Gentleman, do hereby declare the nature of this Invention for "IMPROVEMENTS IN
RECEIVING TELEPHONES," which Invention has been communicated to me from
abroad by James Aloysius Maloney of Washington District of Columbia in the
United States of America, 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 the kind of receiving telephone in which are combimed
a magnet, a non-magnetic diaphragm and a reed-like armature fastened to the
diaphragm and the object of the said Invention is to obtain a simple and efficient
instrument of-this kind the instrument constructed according to this Invention being
characterised by the combination with the magnet and the non-magnetic diaphragm
of a special form of armature (which for convenience sake I term a multiple reed
armature) consisting of two or more reeds or strips which have their free ends
opposed to, and separated by a short interval from one another and are formed in
one with a supporting plate which is fastened tightly to the diaphragm. With an
instrument of this kind speech can be reproduced distinctly and with accuracy.
In the accompanying drawing.
Figure 1 is a longitudinal central section partly in elevation of a recoiving
telephone constructed according to this Invention.
Figure 2 is a perspective view on enlarged scale of the "multiple reed armature"
-detached.
The case A of the instrument is of non conducting material, and of the usual
form; within it is the core B, in this instance a permanent magnet, on the front
end of which is the coil or helix C connected as usual to line by the wires x. y.
The ear trumpet A is closed by a non-magnetic diaphragm D which can be
conveniently made of pino veneer-secured by its edges in the case. Attached to
the inner face of the diaphragm so as to be opposite the pole of the magnet (or
poles in case a horseshoe or equivalent core be used) is the multiple-reed armature E
which is made of soft iron-usually strap iron-and consists of a strip of proper
length whose ends are bent up and then folded inwardly so as to approach one
another nearly, without however touching. The armature as shown has the form
approximately of a quadrangle and this is the form which has been found most
convenient and is on the whole preferred although the form may be varied to some
extent without departure from the nature of the Invention. What is essential is
that there should be free ends constituting tongues or reeds which are opposed to
and separated by a short interval from one another and that these opposed tongues
or reeds should be carried by or formed in one with a supporting strip or plate
common to both. In the armature shown the part a may be considered the base,
the parts b the reed-supporting standards and the parts c c' the free ends or reeds
proper. It is preferred to slot longitudinally each free end as indicated at d so as
to form two reeds of each, and it is this arrangement which in practice has been
found productive of the best results. But the ends may be unslotted in which
case cach of them will constitute but a single reed, and on the other hand more
than one longitudinal alot may be formed in them in which case each would consist
of more than two reeds or tongues, But in any event the free extremity or
extremities of the reed or reeds c would be opposed to that or those of c¹.
The armature is secured rigidly to the diaphragm D by a screw e which passes
through the diaphragm and a hole a¹ in part a and a nut or washer f¹ which is
scrowed down on the projecting inner end of the screw.

page_text: I am aware that a reed like armature secured to a non-magnetic diaphragm or
sounding board is not broadly new in a telephonic receiver and this I do not
broadly claim.
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
The combination in a receiving telephone of a non-magnetic diaphragm, a magnet,
and what I have herein before termed a multiple reed-armature, under the arrange-
ment and for operation substantially as hereinbefore set forth with reference to the
accompanying drawings.