Year: 1888

page_text: Date of Application, 7th Mar., 1888 RESER
Complete Specification Left. 4th Dec., 1888
Complete Specification Accepted, 15th Jan.,
1880
I, HAROLD COLLET of 7 Coleridge Road, Finsbury Park, in the County of
Middlesex, Electrician do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to cheapen the cost of electric telephonic apparatus
and fittings by dispensing with the bell now generally used for the purpose of
signalling or calling up a distant station. For this purpose I utilize the magnet of the
Telephone itself for giving the necessary signal, which is made in the following
manner :-
The line wire L (see Fig. 1.) goes to the switch tongue S, which, when the
telephone is not in use, is in contact with the contact point C₁; C, is connected to
the fixed end of a spring carrying an armature A and making contact with the point P;
from P the circuit is continued through the electro-magnet coil M to the earth or
return wire E. The usual telephonic diaphragm and armature D is shown at the
opposite end of the magnet. When the signalling current is sent through the circuit,
the electro-magnet M attracts the armature A, thus breaking the circuit at P, so that
the armature A will vibrate as in an electric trembling bell. Simultaneously, the
electro-magnet alternately attracts and releases the diaphragm D, thereby causing it
to give out a note or clatter, the tone of which depends upon the rapidity of the make
and break at P, while its loudness will vary with the strength of the signalling current
and of the magnet. The sound may also be increased and re-inforced by allowing
the armature A, or its carrying spring, to strike against a pin or stop or against
the magnet core.
When the Telephone is in use, the switch tongue S is moved (automatically or
otherwise) into contact with the contact point C2, the circuit then passing through
the battery B and the magnet coil M to the earth or return wire E.
In some cases it is not requisite that the person using a telephone shall be
able to send a signal to the other station. In such a case there is a battery used
only at the distant station, which is put into circuit through the telephone there, so
037

page_text: that the latter will emit the same kind of sound as is made by the diaphragm D
at the station called, the entire circuit being broken or closed at P until the second
telephone is switched on ready for use. Fig. 2 shews such a telephone station
without a battery.
The magnet M may be a permanent magnet which is not strong enough to attract
or hold the armature A until strengthened by the calling current. For this purpose
the armature A may be suitably polarized. In such a case the connections will be as
in Fig. 2.
It is evident that the same object will be attained if the magnet M (Fig. 3) be
wound with two coils, one in connection with the point C, through the contact
breaker, and the other with the point C₂.
A separate calling battery may be used, thrown into the line by means of an
ordinary signalling key.

page_text: Improvements in Telephonic Apparatus.
I HAROLD COLLET of 7 Coleridge Road, Finsbury Park, 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 cheapen the cost of electric telephonic apparatus
and fittings by dispensing with the bell now generally used for the purpose of
signalling or calling up a distant station. For this purpose I utilize the magnet of the
Telphone itself for giving the necessary signal, which is made as follows
Referring to the drawings filed with my provisional specification, the line wire
(Fig. 1) goes to the switch tongue S, which, when the telephone is not in use, is in contact
with the contact point C₁; C₁ is connected to the fixed end of a spring carrying an
armature A and making contact with the point P; from P the circuit is continued
through the electro-magnet coil M to the earth or return wire E. The usual telephonic
diaphragm and armature D is shewn at the opposite end of the magnet. When the
signalling current is sent through the circuit, the electromagnet M. attracts the
armature A thus breaking the circuit at P, so that the armature A will vibrate as in an
electric trembling bell. Simultaneously, the electromagnet alternately attracts and
releases the diaphragm D, thereby causing it to give out a note or clatter, the tone of
which depends upon the rapidity of the make and break at P, while the loudness will
vary with the strength of the signalling current and of the magnet. The sound may
also be increased and reinforced by allowing the armature A or its carrying spring,
to strike against a pin or stop or against the magnet core.
When the telephone is in use, the switch tongue S is moved (automatically or other-
wise) into contact with the contact point C2, the circuit then passing through the
battery B and the magnet coil M to the earth or return wire E.
In some cases it is not requisite that the person using a telephone shall be able to
send a signal to the other station. In such a case there is a battery used only at the
distant station, which is put into circuit through the telephone there, so that the latter
will emit the same kind of sound as is made by the diaphragm D at the station called,
the entire circuit continuing to be broken and closed at P until the local telephone (as
in Fig. 2) is switched on ready for use.
The magnet M may be a permanent magnet which is not strong enough to attract or
hold the armature A until strengthened by the calling current. For this purpose the
armature A may be suitably polarized. In such a case the connections will be as in
Fig. 2.
It is evident that the same object will be attained if the magnet M. (Fig. 3)
be wound with two coils, one in connection with the point C₁ through the contact
breaker, and the other with the point C.
A separate calling battery may be used, thrown into the line by means of an
ordinary signalling key.

page_text: 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. The combination in a magnetic telephone of the telephonic magnet and coil
with a vibrating and circuit breaking armature substantially as described and for
the purpose set forth.
2. The combination in a magnetic telephone of the telephonic magnet with a
separately exciting coil and a vibrating and circuit-breaking armature substantially
as described and for the purpose set forth.