Improvements in Telephonic Apparatus.
Year: 1895

page_text: Date of Application, 27th Nov., 1895
Complete Specification Left, 26th Sept., 1896-Accepted, 31st Oct., 1896
Improvements in Telephonic Apparatus.
We, MAXYMILIAN KOTYRA and CHARLES MILDE, both of 26 Rue Laugier,
Paris, in the Republic of France, Electrical Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to telephonic apparatus and has mainly for its object to
increase or amplify the sounds produced at the receiving instrument.
According to our invention we employ in addition to the ordinary induction
coil (whose primary winding is in series with the microphone circuit and secondary
winding in series with the line circuit), another induction coil, the primary winding
of which is arranged in series with the microphone circuit and the secondary
winding thereof in parallel with the line circuit.
Or instead of employing only one additional induction coil as above stated we can
employ two or more of such additional induction coils, all the primary windings of
which are arranged in series with the microphone circuit and all the secondary
windings in parallel with the line circuit.
Or in place of using two or more additional induction coils we may employ a
single induction coil in which the secondary windings are in sections, each of these
sections of secondary windings being arranged in parallel with the line circuit and
the primary winding in series with the microphone circuit.
By the use of the aforesaid additional induction coil or induction coils we not
only greatly augment the distinctness of the sonorous vibrations at the receiving
instrument but by reason of the increase in resistance of the microphone circuit,
we reduce the expenditure of the battery energy and diminish local induction.
Our additional induction coil or coils may be located within the casing of the
transmitting instrument or may be enclosed in a separate casing situated in
proximity to the transmitting instrument.
Dated this 27th day of November 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.
Improvements in Telephonic Apparatus.
We, MAXYMILIAN KOTYRA and CHARLES MILDE, both of 26 Rue Laugier,
Paris, in the Republic of France, Electrical Engineers, 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 telephonic apparatus and has mainly for its object to
increase or amplify the sounds produced at the receiving instrument.
According to our invention we employ in addition to the ordinary induction
coil (whose primary winding is in series with the microphone circuit and secondary
winding in series with the line circuit), another induction coil, the primary winding
of which is arranged in series with the microphone circuit and the secondary
winding thereof in parallel with the line circuit.
Or instead of employing only one additional induction coil as above stated we
C

page_text: can employ two or more of such additional induction coils, all the primary windings
of which are arranged in series with the microphone circuit and all the secondary
windings in parallel with the line circuit.
:
Or in place of using two or more additional induction coils we may employ a
single induction coil in which the secondary windings are in sections, each of these
sections of secondary windings being arranged in parallel with the line circuit and
the primary winding in series with the microphone circuit.
By the use of the aforesaid additional induction coil or induction coils we not
only greatly augment the distinctness of the sonorous vibrations at the receiving
instrument but by reason of the increase in resistance of the microphone circuit,
we reduce the expenditure of the battery energy and diminish local induction.
The aforesaid additional induction coil or coils may be located within the casing
of the transmitting instrument or may be enclosed in a separate casing situated in
proximity to the transmitting instrument.
The accompanying drawings illustrate diagrammatically several ways in which
our invention can be carried into practice.
Figure represents a telephonic receiving instrument with its principal
electrical connections. In this figure a single additional induction coil and its
connections arranged in accordance with our invention are shewn.
Figure 2 illustrates the manner of arranging the induction coils when two of our
additional coils are employed.
Figure 3 illustrates a variation of the arrangement of induction coils shewn in
the previous figure.
Referring first to Figure 1, A A are the line wires forming part of the main or
line circuit. B is the electric battery. C is the microphone and c the
microphone circuit which includes the battery B, and the primary winding c¹ of
the ordinary induction coil whose secondary winding a' is in the usual manner
arranged in circuit with the line wires A A. DD are the receivers. All these
parts are similar to those ordinarily employed in telephonic instruments of the
kind illustrated.
a is the secondary winding and c² the primary winding of my additional
induction coil. The said primary winding is connected in series with the
microphone circuit by the wires cx and the said secondary winding a² is connected
to the line circuit by the wire a* and by a wire a to the secondary winding a¹ of
the first mentioned induction coil. The primary windings of the ordinary and the
additional induction coils are therefore, as already stated, arranged in series with
the microphone circuit and the secondary windings of the ordinary and additional
induction coils are arranged in parallel with the line circuit.
In Figure 2 we have shewn how the primary and secondary windings of the
additional induction coils are arranged relatively to the ordinary induction coil,
when two additional coils are employed.
As in the preceding figure A A are the line wires; B is the battery; C the
microphone and D the receiver. cc care the primary windings of the induction
coils all of which are in series with the microphone circuit c. a', a² a³ are the
secondary windings of these induction coils all of which secondary windings are in
parallel with the line circuit.
In the modification shewn in Figure 3, the three secondary windings a¹ a² a³ are
combined in one induction coil, that is to say only one primary winding cof
considerable length is employed and upon this single primary winding the
secondary windings are arranged in sections as illustrated in the drawing.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. The combination with a telephonic apparatus provided with an induction coil,
of an additional induction coil or coils whose primary windings are connected in
series with the primary winding of the ordinary induction coil and microphone

page_text: circuit, and whose secondary windings are connected in parallel with the line
circuit substantially as described and for the purpose specified.
2. A telephonic apparatus provided with an induction coil whose primary
winding is in circuit with the microphone and whose secondary winding is
composed of several individual windings each of which is in parallel with the line
circuit, substantially as described.
Dated this 25th day of August 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.