Year: 1886

page_text: I PATRICK GANNON of 107 Saint Georges Road in the County of Surrey
Electrician do hereby declare the nature of this Invention to be as follows:-
The principal object of my Invention is to provide means whereby a return
current is transmitted to the sending station to indicate that the bell at a distant
station has sounded in cases where a magneto call apparatus is used.
According to my Invention I provide the armature of the bell with an arm
pendulum or equivalent moving part acting as an automatic switch by which
contact is made and broken in the primary circuit of the induction coil so that a
secondary current is sent to the station of origin or so that a current from a
battery is transmitted to the sending station to denote that the bell has sounded at
the distant station.
I may use a coil caused to move before the poles of a permanent magnet to
generate the return current.
In applying my Invention to the Gower Bell telephone I prefer to carry the
transmitter in the door of the signalling apparatus and the receiver on a door or
flap below the ordinary door and covering a box containing the induction coil and
switch The said transmitter and receiver are thus situated at or about right
angles to their usual position so as to economize space and give room for the
battery behind and below the receiver.
To provide a lightening arrester for the telephone which can be readily renewed
I separate the terminal screw plates by a considerable space and bridge it by a
spring between which and one of the plates paper or other readily renewable
nonconducting material is placed.

page_text: Improvements in Telephonic Apparatus.
I PATRICK GANNON of 107 St Georges Road in the County of Surrey
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 provide means whereby a return current is
transmitted to the sending station to indicate that the bell or calling device at a
distant station has been sounded or operated applicable more especially in cases
where a magneto call apparatus is used.
According to my Invention I provide the armature of the bell or moving part
of the calling device with an arm pendulum or equivalent moving part which
owing to the movement for operating the bell or device vibrates or moves so as to
send a return current back to the sending station to give the required indication.
The said pendulum or its equivalent may for this purpose act as an automatic
switch by which contact is made and broken in the primary circuit of the induction
coil and an induced current is sent to the sending station or so that a current from
a battery is transmitted to the sending station to denote that the bell has sounded
or calling device been operated at the distant station-Or the said pendulum may
carry a coil caused to move before the poles of a magnet so as to induce the
necessary return current or the magnet may similarly be carried by the pendulum
and be caused to move in proximity to a coil for the same purpose-I will describe
with reference to the accompanying diagram the best means with which I am
acquainted for carrying my Invention into effect.
The said diagram illustrates my Invention as applied to the operation of the
pendulum as a switch to make and break contact in a circuit with the primary of
the induction coil to send induced currents along the line to the sending station
when the pendulum vibrates after the bell or calling device has operated so as to
act as an automatic switch but it is to be understood that my Invention is not
limited in its application to the way shown of causing the pendulum or the like
to effect the production of the return current nor is it limited to the form of
instrument shewn.
In the accompanying Diagram a is the case of the telephone and b is the lid or
door thereof. c are the gongs mounted on the body a and e are the coils of the bell
these coils being situated on the lid bin the position shewn with the armature f
beneath-d are the magnets of the bell sounding magneto electric generator-
g indicates the receiver and h the transmitter indicates the local battery and
the induction coil of the telephone-k is the earth plate-7 is the telephone switch
and m is the line wire. The ordinary connections for the working of the telephone
are provided According to my Invention I provide the armature ƒ with a stem n
preferably of flexible steel spring having thereon a contact maker and breaker or
automatic switch p this stem and switch piece constituting a pendulum-In
proximity to the contact piece p are two contact springs q and r fixed to con-
ducting brackets, 8 t affixed to the lid b-The said springs are arranged (as shewn
at X in view at right angles to that shewn in the diagram) so that their adjacent

page_text: ends do not touch cach other but are in such a position that the contact piece or
bob p of the pendulum will make contact with both springs simultaneously only
when the pendulum is set in motion by the ringing of the bell. u is a wire con-
necting the bracket s with the contact piece v of the switch the connection being
thence to one pole of the battery i. w is a wire connecting the bracket t to the
wire leading to the other pole of the battery through the primary of the induction
coil. After the bell has rung the piece p by the vibration of the pendulum of
which it forms the bob makes and breaks contact between the ends of the springs q
and thereby closing and opening the local circuit through the primary of the
induction coil and inducing a current in the secondary thereof which induced
current passes to the line as shewn by the arrows and thence to the sending
station (that from which the call has come) and through the receiving instrument
at that station the pulsations due to the make and break of the bob p can be heard
and so it is ascertained that the bell has rung at the called station.
There may be but one end to each of the springs qr to be touched by the piece p
but I prefer to provide two ends to each for this purpose as shewn to insure the
proper action of the device.
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-
1st In telephones the combination with the bell or calling device of a pendulum
or automatic switch operated by the movement which sounds the bell or actuates
the calling device so as to send a return current substantially as and for the
purpose hereinbefore described.
2nd In telephones the combination with the armature of the bell of a pendulum
which is vibrated by the movement of the armature and by its vibrations generates
or induces a return current substantially as and for the purpose hereinbefore
described.
3rd In telephones the combination with the battery circuit and the primary of
the induction coil of a circuit which is closed and opened by the vibrations or
oscillations of a pendulum or its equivalent operated by the movement which
sounds the bell or actuates the calling device substantially as hereinbefore
described.
4th In telephones the combination with the bell armature of the pendulum up
and with the battery circuit of the springs q and 7 substantially as and for the
purpose described.