Improvements in and relating to Telephonic Apparatus.
Year: 1892

page_text: Date of Application, 1st Nov., 1892
Complete Specification Left, 11th Jan., 1893-Accepted, 25th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Telephonic Apparatus.
I GEORGE SEPTIMUS HOOKER 184 Evering Road Clapton London Electrical
Engineer, do bereby declare the nature of this invention to be as follows:-
--
This object of this, invention is to simplify the arrangement of telephonic
apparatus and consists in arranging the coils of the bell used for ringing so that
they also act as the induction coils, the hammer and armature being used as a key
also in arranging and simplifying the connections of the various parts & the same
is carried out in the following manner. I wind the iron cores of the call or ringing
bell with two wires, one as the primary and the other as the secondary coil. The
telephone is hung upon a metal hook or lever by means of two bent rods attached
to the telephone terminals so that same is short circuited when not in use, one
terminal being to "earth" the other terminal being connected to the secondary coil
and thence to the bell armature by a spring or other suitable connection, said
armature being connected to the "line wire when in its normal position. The
transmitter or microphone is in circuit with the primary coil & when the telephone
is removed from the connecting hook, contact is made by said hook and the micro-
phone circuit closed. It will be understood that a similar arrangement is employed
at the other end of the "line" wire. A battery is provided at each station one
pole being connected to "earth."
In a niodified arrangement of the apparatus, I connect the ends of the secondary
coil to a contact piece operated by the hook aforenamed which in this modification
the hook is connected to "earth." When the telephone is hung up the coils are in
parallel circuit, and when the telephone is off the hook the secondary coil is in
series. In a further modification I employ a polarised armature which enables me
to use a magneto current to operate the bell or a pulsating current through the
secondary coil by making and breaking contact in the primary coil.
Dated this 1st November 1892.
E. EATON,
Patent Agent.
COMPLETE SPECIFICATION.
Improvements in and relating to Telephonic Apparatus.
I, GEORGE SEPTIMUS HOOKER 184 Evering Road Clapton London Electrical
Engineer, 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 this invention is to simplify the arrangement of telephonic
apparatus & consists in arranging the coils of the bell used for ringing so that they
also act as the induction coils (the hammer & armature being used as a key) also
in arranging & simplifying the connections of the various parts & the same is
carried out in the following manner. I wind the iron cores of the call or ringing
bell with two wires, one as the primary & the other as the secondary coil. The
telephone is short circuited, when not in use by being for instance hung upon a
metal hook or lever by means of two bent rods attached to the telephone terminals
so that same is short circuited when not in use, one terminal being to "earth" the
other terminal being connected to the secondary coil & thence to the bell armature,
which is connected to the line wire by a spring or other suitable connection when
in its normal position. If required I provide a suitable insulated přece which

page_text: retains the armature in position when talking. The transmitter or microphone is
in circuit with the primary coil & when the telephone is removed from the con-
necting hook contact is made by said hook & the microphone circuit closed. It
will be understood that a similar arrangement is employed at the other end of the
line wire. A battery is provided at each station, one pole being connected to
earth.
Referring to the annexed drawings,
Fig. 1 shows the arrangement of a complete telephonic apparatus, and the
required connections, according to my invention.
Fig. 2. view of loop for suspending telephone receiver.
Fig. 3. view of hook for preventing armature from being attracted, when
microphones are in circuit.
a the battery which may consist of one or more cells, connected to earth at e
the other pole of the battery being connected to the primary coil through the
microphone to the contact hook and thence to the battery aj secondary coil
connected to earth e through the telephone d being short circuited through hook i
and loop f. . armature connected to line wire c and secondary coil j. by spring
contact k. 7. bells.
The action is as follows.
When it is desired to ring up the armature b is pressed against the contact mor
by key & thus putting the battery a in circuit with the line c secondary coil j¹
thence through the short circuited telephone d¹ to earth e¹ which rings the bell l' at
the opposite station owing to the attraction of the armature which makes &
breaks contact at kl. The telephone is now lifted from off the hook i the end of
which falls and puts the microphone in circuit with the battery a by contact n.
The induced current produced in the secondary coil j. passes through contact / to
armature then line c through the secondary coil at the opposite station through
the receiver or telephone to earth e¹. 9 spring for controlling lever i.
In Figure 3 the end of the hook i is arranged so as to fall upon the spring
piece o insulated at p thus retaining the armature in contact at during
conversation.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed I declare that what I
claim is.
1. The combination and arrangement of telephonic apparatus substantially as
illustrated in Figure 1 of the annexed drawings and described in this Specification
for the purpose set forth.
2. In bells for telephonic apparatus surrounding the cores of the bell with a
primary and secondary coil in combination with an armature for ringing said bell
substantially as described by which means the coils of the aforesaid bell or bells
may be used as induction coils for transmitting microphone variations of the
current substantially as described.
Dated this 11th day of January 1893.
E. EATON,
Patent Agent.