A TELEPHONIC ADDADA
Year: 1883

page_text: LETTERS PATENT to Charles August Teske of 11 Saint Johns Hill Grove
Wandsworth in the County of Surrey for an Invention of A TELEPHONIC
ADDADATHIS
PROVISIONAL SPECIFICATION left by the said Charles August Tesko at
the Office of the Commissioners of Patents on the 22nd January 1883.
CHARLES AUGUST TESKE of 11 Saint Johns Hill Grove Wandsworth in the
County of Surrey A TELEPHONIC APPARATUS.
It
My present invention consists of an Instrument where transmitter, receiver, bell,
push switch induction coil and relay are combined in one so that the whole system
may be handed about from ear to mouth and back to the desk or vice versa.
can be placed to any piece of furniture or projection. It switches off battery or
line communication &c by its own weight on placing it on a flat surface. The
only fixture at the wall is a few binding screws two to the battery and two to the
line which are separated from the instrument by a flexible cord or conductor. The
apparatus is small enough to be carried in the coat pocket. The apparatus has
an acorn shape and stands on its larger part or mouth-piece where the sound is
directed upon or taken from The instrument is 5', inches in height by 31 inches
in width on its larger part and 23%, inches in width on its narrow part but it is
subject to alteration. The outer case can be made of any non-conducting material,
polished or otherwise and its entire weight varies from One and a quarter pounds
to One and a half pounds and forms a very neat and compact instrument. When
the instrument stands on its larger part or mouth piece the bell push is on the top
in the centre; on being pressed upon it shunts the local battery on the line which
causes the bell to ring on the other station cuts off its own bell while being presse]
and no electricity is flowing through the receiver, transmitter induction coil and
relay. On relieving the finger from the push the current local battery circuits
through the transmitter receiver induction coil and, relay, opens the bell circuit to
receive the bell signal from the other station When the instrument is at rest
no electricity is on the line. Another new arrangement of switch is placed in the

page_text: acts as follows:-
1 It closes bell circuit which causes the bell to ring by a current sent from the
other station.
2 It opens line circuit for induced current sent from the other station.
3. It short circuits the local battery from passing through transmitter and
receiver.
When the instrument is taken in hand to be spoken into or taking off sound
the switch acts as follows:-
--
1. It opens the bell circuit and no electricity sent from the other station would
cause the bell to ring.
2 It closes line circuit for receiving induced current from the other station
through the receiver
3 It opens local battery circuit through transmitter and receiver.
This said switch is opened and closed by the weight of the instrument.
A small projection in the side of the face of the resonnant box sufficient to
make and break contact acted upon by the weight of the instrument is all that is
required for telephonic communication The bell induction coil and relay are
constructed in a manner to suit the shape of the instrument. The bell is for long
distance and requires very little battery power.
I make use of one battery only for both bell and transmitter. A fow binding
screws are sufficient to fix the flexible conductor to any place desirable The
transmitter consists of a plate of any vibrating material cut in parts and insulated
one from the other screwed on a wooden frame so that the parts unite in the
centre by the loose contact of carbon which is fixed at the side where the sound
waves are directed. By so doing the carbon is pressed together consequently alters
the resistance in the line and transmits speech or sound.
There can also be placed small pieces of metal with platinum at their ends
acting as springs on each separate piece of the cut plate and resting on the carbon
so making microphonic contact and the current passing through the cut plate so
many times as there are pieces cut will increase the sensitiveness of the transmitter
and takes the tension away from the centre of the plate. The face forms so many
double springs as there are pieces. A piece of silk is stretched over it to prevent
the derangement of the parts.
For improvement I claim sensitiveness.
The Receiver consists of two vibrating plates indented in the centre (or a small
piece of iron may be fixed in the middle of the plates) facing each other loosely
in the centre of a small coil of fine wire which is fastened to the same as the plates
so that the two indented poles have free play in the coil which is actuated from
the line circuit. The plates are also united at their edges so as to make a horse-
shoe magnet forming a box of vibrating material Iron or Steel with the coil
in it having for its edges the neutral line. The small parts of iron screwed
to the plates can be permanent or electro magnets to render the sound more
distinct.
The advantages of this telephonic system are great first, for cheapness, secondly
for usefulness, thirdly for comfort, fourthly for necessity and it can be placed in
front of you upon the sheet or book you are writing as it requires only three
inches space, no disfigurement of the walls or grand plump stand on the table.
The improvement is great. The instrument after using it can be put in the
drawer of any table or desk so it prevents people from tampering with it after
business hours,

page_text: An instrument acorn or pear shaped as herein described or any shape to handle
about from ear to mouth.
A switch which shunts off the circuits mentioned by the weight of the instrument
as herein described In an Instrument as this system a push constructed to act
on circuits as herein described.
No plate which is cut in pieces may be constructed so that the pieces themselves
make the electric contact in the centre.
At the middle of each piece of plate no piece of carbon or suitable material
which will increase or lower the resistance in the circuit must be fixed so that they
will touch each other loosely the sound waves which are directed upon will press
them closer together and so alter the resistance.
No plate may be constructed so that the current enters at the parts of the
cut plates and goes through the carbon and back again to the plate from which
it came.
No part of the cut plate may be united with a thin spring platinum studded
resting against the carbon so that the current enters the one part of the plate
goes through the carbon to the spring and from there through another part of the
plate and so ou through as many as there are forming a set of springs fixed on
either side.
No carbon must be fixed at the side where the sound waves are directed upon.
No receiver may be constructed consisting of two vibrating plates pressed in,
in the centre so as to form two plates with a little cup in the centre or instead
of this little cup a small piece of iron or steel is screwed in the centre to each plate
so as to face each other loosely in the centre of a coil which is fixed on the frame
and the two indented poles of the the plates facing each other playing loosely in
the centre of tho coil as herein described.
No plates may be joined at their outer edges so as to form a horse shoe magnet
entirely of vibrating sheet iron joined together at their neutral line or any part
of them to form a box with the coil in the centre.
The two plates may not be made so that each plate is fixed at its edge to a frame
made of wood or suitable material independant one from another having only
magnetic influence in the centre of the coil.
I claim as well the combination of the two instruments receiver and transmitter.
No plate cut in parts may be constructed so that each part is fixed on the wooden
frame by a thread of silk or conducting material so that the pieces of the plate
fall loosely in the centre on a piece of carbon so forming microphonic contact.
As the instrument can be simplified by using only primary circuits and dis-
pensing with the secondary which passing through transmitter to the receiver and
bell circuit I claim that no instrument may be made of this description.
The following explains the drawing
a. wood. c. gutta percha.
b. ivory. d brass & copper.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles August Teske in the Great Seal Patent Office on the
21st July 1883.
CHARLES AUGUST TESKE of 11 Saint Johns Hill Grove Wandsworth in the
County of Surrey "A TELEPHONIC APPARATUS
"
A telephonic apparatus according to my invention contains within itself a
transmitter, a receiver, a signalling device and means for breaking the electric
circuit through which the said signalling device is operated and completing a
current for operating a signalling device at a distant place, also means for placing
the transmitter and receiver in circuit as required (it may be both at once or one
at a time) the signalling device being then cut out, the whole forming a portable
instrument that can be connected to battery and line wires through a flexible con-
nection or connections and be placed on a table or elsewhere and handed about
from ear to mouth and vice versa as required.
Such an apparatus is represented in Fig 1 of the accompanying drawings in
longitudinal section.
Fig 2 shews an inverted plan of the bell push at the end of the apparatus; also
in plan the devices for (1) placing the transmitter in circuit with the local battery,-
(2) placing the receiver in circuit with the line wires, and (3) breaking the bell
circuit; and this view also shows diagrammatically the connections between theso
parts. Likewise the connections are shewn to the parts represented in Figs 7
and 9 as mentioned below.
Fig 3 is a perspective view of the bell push mechanism.
Fig 4 shews a complete diagram of the connections.
Fig 5 shews in perspective an additional push or switch which when the induc-
tion coil is dispensed with will be required for putting the receiver and the
transmitter alternately in connection with the line wires.
Fig 6 is a similar view to Fig 4 shewing the connections when the induction coil
is dispensed with.
Fig 7 is a perspective view of the transmitter showing it connected up to the
instrument, and Fig 9 shews a receiver which although connected to the parts
represented in Figs 2 and 7 (which are such as represented in Fig 1) yet differs
from the construction of receiver shewn in Fig 1.
Figs 8 and 10 illustrate other modifications of my improved receiver.
My telephonic instrument, as will be seen, is constructed with a casing A of a
form such that when out of use it can rest on a table or other support. Within
the casing A is arranged a signalling device B comprising a bell b with striker b'
and electro magnet b; also the casing contains a transmitter C and a receiver D
as more particularly described below.
E is a rod or device secured in place by a spring e and capable of sliding move-
ment in the direction of its length. When the instrument is on a table part of its
weight is supported by the lower end of E which thus automatically puts the
signalling device in circuit with the line and breaks the circuits of both the trans-
mitter and the receiver. The mouth and ear piece F is screwed or otherwise fitted
or fixed to the part c of the resonant box and is within the mouth a of the casing A
on which the instrument rests when out of use, there being a small annular space f
between the casing and the mouth piece. The receiver D comprises two plates or
discs d of material (such as iron) that will vibrate, and an interposed coil d². The
discs are preferably formed with either hollow or solid concentric projections d² which
may form parts of or be fixed to the centres of the discs and project freely into the
interposed or receiver coil d' These projections are made of iron or steel or other

page_text: magnetic material and may face each other in the coil without touching one
another or may be in contact within the coil, or may be a single piece of iron or
steel secured to the two plates or discs and passing through the coil. The plates.
or discs & may be secured at their edges to the case of the instrument as in Fig 1,
or they may rest upon a wooden ring do and be laid upon pins or pieces of iron or
steel or other magnetic metal passing through the wooden ring d¹º in the centre of
which the coil is secured as in Fig 8 where d" are the pins; or the plates, if of
magnetic material, may be joined at the circumferences so as to form a continuous
horse-shoe magnet to the neutral line of which the coil is secured as in Fig 9. In
this Fig the central parts d³ of the plates & are shown as projecting inwards and
overlapping one another, leaving a central space for the sound waves to pass
through to the futhermost side of the inner plate.
Another form is shown in Fig 10, where the receiver is constructed with two pieces
of hard wood or vulcanite or other material that will vibrate, the two resembling
a box and lid the top and bottom of which constitute the vibrating discs or
plates there being concentric iron or steel projections d² that pass freely into the
coil d' which is suitably secured within the box as will be readily understood.
The transmitter C comprises a metallic ring c situated between the part c of
the resonant box and the mouth piece F and mounted freely on pivots projecting
from supports or brackets c¹ fixed to the part c of the resonant box. The ring clo
is provided with two metallic arms projecting from it at right angles to the axis
of support; each arm is provided with a weight c screwing on to it so as to enable
the transmitter to be perfected balanced or regulated. At the extremity of one
arm is fixed a small carbon ball e resting on one or two blocks of carbon c® secured
to c, and between c and the extremity of the other arm is provided a small
regulating screw c' which serves to limit the motion of the transmitter. The
current of electricity either enters by the two metallic supports c' through the
pivots and arms to the carbon ball and leaves by the block or blocks of carbon co
or vice versa or it enters by one block of carbon and passing through the ball leaves
by the other block.
Behind the receiver D is mounted in the switch box a' which forms a part of
the casing A a switch G which may act automatically or not; that shewn being
automatic; if the induction coil be suppressed there is also required a push or
switch such as shewn in Fig 5. The switch G comprises a block g* of insulating
material secured to a metallic piece g³ pivotted to a metallic rod a* screwed into
the switch box a'. The block g* carries two spring arms g³g which make contact
respectively with the contact pieces g and g or g³. The rod E when the instru-
ment is on the table bears against the arm go and causes the arm g³ to break
contact with the contact piece g' and the arm g to make contact with the contact
piece g. When the instrument is raised the arm g³ makes contact with the
contact piece 9' and the arm go with the contact piece g³. g" is a button whereby
a spring can be pressed against E to prevent its movement when the apparatus is
applied to the ear-Four springs h¹ h³ h³ h* are also secured in the switch box a¹
and serve to connect, when the parts of the instrument are screwed together, the
contact pieces of the switch with the receiver and transmitter. The bell b is
secured behind the switch box a' in any suitable manner to the metallic rod a*;
and in the part a' of the casing is the electromagnet 62 for operating the bell b
The part of the casing is secured to an insulating plate a³ itself secured by the
rod a which also serves to keep in position the electromagnet and induction coil.
Side by side with electromagnet'b' is the induction coil J and if desired a relay.
When the induction coil is dispensed with a dry battery for working the instru
ment may be substituted. K is a push (shewn clearly in Fig 3) secured to the
insulating plate a³. The metallic spring k¹ of the push K is connected to k*.
and normally makes contact with piece k but when pressed in makes contact
at k³
The operation of the apparatus is as follows:-
Ang that the instrument
An
a table and that it is desired to send n

page_text: message, a signal is first transmitted to the place to be communicated with which
I will call the receiving station. For this purpose whilst the instrument at the
sending end is still on the table the device k* is pressed in and thereby the
circuit through the signalling device at the receiving station is closed the current
passing from the entire battery L (Figs 1, 2, 4 and 6) through the wire 1, spring
piece k, contact piece ³, wire 2 to line . The return signal is then awaited (the
instrument being still on the table). It comes in by the line wire 2, spring
piece contact piece ³ wire (and, in the arrangement Fig 6 thro the
additional push M) spring 9º, contact piece g, wire 4 electromagnet b³, wire 5,
piece g, rod at, screw k, wire 6, and to earth. The instrument is then taken off
the table, the bell circuit being thus automatically broken and the transmitter or
receiver or both as the case may be (according to whether an induction coil is
used or not) is placed in circuit. The instrument is then raised to the mouth and
if an induction coil is used (Figs 1. 2 and 4) the current passes from one or more
cells of the battery L by the wire 7, spring g³, contact piece g* wire 8, primary of
induction coil J, wire 9, spring h¹, transmitter C, spring h³ to piece g³, rod a line
to earth. A current is thus induced in the secondary wire which passes therefrom
by wire 11, contact 9, spring go, wire 3, contact piece k, spring, wire 2 to
line and returning by earth wire 6, rol a', piece g², spring receiver coil d¹
spring wire. 12. If the induction coil is dispensed with the current passes
from the battery L (Fig 6) by wire 7 spring. g³, contact piece g, spring h¹, trans-
mitter C, spring additional push M (now supposed to be pressed in) wire 3,
contact piece ², spring k¹, wire to line 7.
To receive a reply or message the instrument is applied to the ear and the current
entering by the line 2, wire 2, spring, contact piece k³, wire 3 spring gº, contact
piece 9, wire 11, secondary of induction coil, wire 12, spring h³, receiver coil d',
spring h* piece g₁ rod a wire 6 to earth produces the necessary vibrations to
reproduce the message. If no induction coil is used the current entering by line
proceeds by wire 2, spring, contact pieco k², wire 3, additional push M, wire 10,
spring 9, contact piece go, spring ³, receiver coil d' spring h², piece g², rod a',
wire 6, and to earth.
:
Having described; the nature of my said invention and in what manner it is to
be performed what 1 claim as secured to me under the hereinnbove in part recited
Letters Patent is,―
1 A telephonic apparatus containing within itself a transmitter, a receiver, a
signalling device, and means for breaking the electric circuit through which the
said signalling device is operated. and completing a circuit for operating a signalling
device at a distant place, also means for placing the transmitter and receiver in
circuit as required the signalling device being theu cut out, the whole forming a
portable instrument that can be connected to battery and line wires through a
Hexible connection or connections and be placed on a table or elsewhere and
handed about from ear to mouth and vice versd as required, substantially as
hereinabove described.
2 In a telephonic apparatus of the kind above referred to the use of an
automatic switch which by weight or pressure of the instrument closes the circuit
of the bell or signalling device and opens the battery circuit, and when relieved of
such weight or pressure puts the bell or signalling device out of circuit and the
transmitter and receiver or one of them and battery for operating the same in
circuit substantially as described.
3 In a telephonic apparatus of the kind above referred to the use of a push so
arranged in connection with suitable contact conductors and the signalling device
of the instrument that normally that signalling device will be in circuit but by
actuating the push the said signalling device can be cut out of circuit and a circuit
closed to a distant signalling device substantially as described.
4. In a telephonic apparatus the use of a receiver constructed with two plates or
discs and an interposed coil whether such plates or dises be connected at their
centres or not substantially as described..
፡

page_text: 5 In a telephonic apparatus the use of a receiver constructed with two plates or
discs having central projections (hollow or solid) that enter a coil interposed
between the said plates or discs substantially as described
6 In a telephonic apparatus the use of a receiver constructed with two plates
or discs with central projections and an interposed coil, the said plates being
united or connected at their outer circumferences or edges, or between the samo
and their central projections so as to form a continuous horse-shoe magnet able to
vibrate substantially as described.
7. The improved telephonic apparatus constructed arranged and operating as
above described and shewn in the drawings
In Witness whereof I the said Charles August Teske have hereunto set my
hand and seal this twenty first day of July in the year of our Lord one thousand
eight hundred and eighty three
CATESKE lol