An Improvement in the Adaptation of the Telephone to Electric Bell Pushes such as are Used in Ordinary Bell and Indicator Systems for Private Houses, Offices, Hotels and the like.
Year: 1898

page_text: Date of Application, 5th Oct., 1898,
Date of Application, 5th Oct., 1898,
Complete Specification Leit, 5th July, 1899—Accepted, 5th Oct., 1899
PROVISIONAL SPECIFICATION.
An Improvement in the Adaptation of the Telephone to Electric Bell
Pushes such as are Used in Ordinary Bell and Indicator Systems
for Private Houses, Offices, Hotels and the like.
GEORGE LEE ANDERS, Electrician, 33, Peak Hill Gardens, Sydenham, S.E.,
ALEXANDER JOHNSTONE WILSON, the Younger, of 80, Lombard Street, London,
E.C., Gentleman, do hereby declare the nature of this invention to be as follows:-
Theses improvements are-(a) The method of constructing the microphone o
transmitter, consisting of a recessed disc, containing the carbon granules enclosed
by a carbon diaphragm this dise is provided with all the working parts, which
are, terminals for the line, bell, and battery-wires, the microphone and two
peices of metal attached to opposite sides of the disc, capable of projecting through
the front of a suitable case and designed to hold the receiver when not in use
to one of these metal pieces is attached an automatic switch. (b) The method of
constructing the receiver, consisting of a ring" magnet carrying bell and
battery contacts, (insulated from the magnet,) to this magnet is attached a ringing
key, operated by a button from the outside of the receiver case, the ringing key
except when not pressed rests on the bell contact when pressed it connects line
with battery through a metal ring capable of making contact with the projecting
metal pieces on the microphone disc. The coils & contacts on this ring magnet
are connected to the microphone by a suitable flexible conductor.
(
(c) The method of attaching the receiver to the microphone whereby the two
parts can be readily inserted or taken out of their cases. The object being to
secure a uniformity in the manufacture of the working parts, and variety as to
material and design in the cases or mounting of the working parts.
(d) The method of short circuiting the apparatus by placing the microphone
and receiver between the two metal pieces attached to the microphone disc.
(e) The method of permitting a current to flow through the apparatus, only
when the receiver is held in the fingers for listening. This is accomplished by
an extension of the ringing key in the " ring" magnet which projects through
the receiver case, and is operated by the finger while holding the receiver to the
ear.
Dated this 5th dev of October 1808
GEORGE LEE ANDERS,
A. J. WILSON, JUN.

page_text: An Improvement in the Adaptation of the Telephone to Electric Bell
Pushes such as are Used in Ordinary Bell and Indicator Systems
for Private Houses, Offices, Hotels, and the like.
We, GEORGE LEE ANDERS and ALEXANDER JOHNSTONE WILSON, both of 33,
Peak Hill Gardens, Sydenham, in the County of London, 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:―
Our invention relates to telephonic apparatus and consists in a very neat and
simple construction of apparatus which is intended for use in place of the ordinary
push commonly employed with electric bells.
The apparatus consists of two parts, one the transmitter, which is in general
secured to the wall or otherwise fixed, and the other part being a receiver, which
is adapted to be applied to the transmitter or base, and the front of which is
arranged like an ordinary push button.
The features of novelty in our invention reside in the particular arrangement
of the parts by which compactness and simplicity are ensured, and the liability of
the same to get out of adjustment avoided. The microphone and receiver are
so constructed as to be complete in themselves and can therefore be put into or
taken out of any desired casing without reference to the design of such casing,
all the necessary electrical parts being provided on the microphone or receiver
and not connected independently to the casings as has heretofore been the
general practice. Further advantages arise from the fact that receivers and
transmitters constructed in my improved manner may be supplied of a single
pattern or type which can nevertheless be applied to any desired forms of casing
without electrical adjustment being necessary.
In the accompanying drawings we shew apparatus constructed according to
our invention.
Figure 1 is a front elevation of an entire apparatus, and
Figure 2 is a side elevation of the same.
Figure 3 is a front elevation of the transmitter and its casing.
Figure 4 is a rear elevation of the receiver.
Figure 5 is a rear elevation of the receiver with portions of the outer casing
and diaphragm removed so as to shew more clearly the magnet and parts secured
thereto.
Figure 6 is a section on the line VI-VI, Figure 4.
Figure 7 is a side elevation, partly sectional, of the receiver magnet and
parts secured thereto.
Figure 8 is a rear elevation, and
Figure 9 a plan, partly sectional, of a transmitter when removed from its
supporting base.
Figure 10 is a diagram shewing the connections to one instrument with the
line bell battery and return or earth,
Figure 11 is a rear elevation, partly sectional, of another form of receiver.
Figure 12 is a vertical central section of the same.
Figure 13 is a side elevation of the receiver magnet and parts secured thereto.
Figure 14 is a diagram similar to Figure 10, illustrating connections of the
second form of transmitter.
Referring now more particularly to Figures 1 to 9.
1 is the casing of the transmitter which is secured to the wall or the like by

page_text: means of screws passing through suitable holes in the usual manner. Said casing
is provided with openings 2 at the sides for a purpose hereinafter mentioned.
The receiver casing is indicated at 3 and may be made of insulating material,
such as ebonite, suitable for the purpose. Said casing is of a shape similar to
that of the central portion of an ordinary electric bell push being provided with
a central orifice 4 through which a push piece 5 projects. The orifice is also
provided at the side of said casing through which the leads 6 connecting the
receiver with the transmitter are passed. At the back the receiver casing is closed
by the receiver diaphragm 7 with protecting cover 8, the whole being secured
by means of a metal ring 9 which is screwed upon the receiver casing. The
transmitter proper is shewn in Figures 8 and 9, and consists of a disc of insula-
tion 10, the central portion of which is cut away in order to receive the case 11
of a microphone containing the usual carbon granules. The front of the micro-
phone case is flush with the front face of the ring or disc 10 and is closed by
the microphone diaphragm 12 which is partially covered by a ring 13 of insulating
material. The main portions of the transmitter above enumerated are secured
together in any suitable manner and to the back thereof are attached two pieces
of metal 14, 15, which project towards the front and are adapted to extend through
the openings 2 in the transmitter casing as shewn clearly in Figures 1 to 3.
These pieces of metal are turned inwards (see Figure 9) and are so. shaped
as to form clips to receive the metallic ring 9 of the receiver and to engage with
a groove 16 formed therein. The metallic piece 15 hereinabove mentioned has
secured to it at the back a metallic spring 17 which projects through suitable
slots in the piece 15 and is adapted normally to engage with the edge of the
diaphragm 12 (see Figure 9), portions of the insulation pieces 10 and 13 being
cut away for this purpose. The diaphragm is thereby normally connected to the
screw 18. When, however, the receiver is placed between the supporting clips 14,
15, as shewn in Figures 1 and 2, the rim 9 thereof presses the spring 17 away
from the edge of the diaphragm 12 and thereby breaks the connection between
the diaphragm and the screw 18 and connect the latter with the ring 9 of the
receiver. This ring is permanently connected through a tongue 19 forming one
terminal of the ringing key as hereinafter described.
The receiver magnet as will be seen from Figures 5, 6 and 7, is a ring magnet 20
such as is commonly employed in watch receivers, and secured to it are two
terminals one of which 21 is in electrical connection with a strip 22 which
normally makes contact with the movable portion 23 of the ringing key, the
other end of said movable portion being secured by a screw 24 to the maguet 20
and to the tongue 19. It will be seen further that normally the ring 9 is con-
nected through the tongue 19, the screw 24, key 23, and strip 22 to the terminal 21..
Said terminal and the strip 22 are insulated from the magnet 20 in the usual
manner as shewn in Figure 7. The other terminal 25 is also secured to but
insulated from the magnet 20 and is in permanent electrical connection with a
strip 26 with which the key 23 connects when the push button 5 is pressed
inwards. Said terminal is joined to one end of the coil 27 of the receiver magnet,
the other end of said coil being joined by a wire 28 which is preferably included
with the wires 29 and 30 passing through the terminals 21 and 25, respectively,
in a flexible cord 6. It will be seen therefore that the magnet 20 has secured
to it all the operative parts of the receiver, and also the connecting wires, none
of these being permanently attached to the casing. By this construction we are
0 enabled to vary the form of the casing to a very considerable extent, using stock
patterns and sizes for the operative parts of the receiver.
The
The electrical connections of the apparatus are shown in Figure 10.
battery 31 is connected between the earth E or the return wire and the screw 32
(see Figure 8) which is connected through the wire 30 in the flexible lead G
The screw 33 on the transmitter
5 to the insulated terminal 25 of the receiver.
which is in permanent electrical connection with a plate at the back of the micro-
phone is connected through the wire 28 with the other end of the receiver coil,

page_text: The bell 34 is connected between earth or the return wire and the screw 35 on
the transmitter which screw is connected through the wire 29 with the terminal 21
on the receiver. The line is connected to the screw 18 on the transmitter which as
before mentioned is in connection with the clip 15 and the spring contact 17.
The operation of the apparatus is as follows:-
When the receiver is placed between the clips 14 and 15 of the transmitter as
shewn in Figures 1 and 2, the spring 17 is pressed away from the edge of the
diaphragm 12 so that the line wire which is attached to the terminal 18 is
disconnected from the transmitter diaphragm; at the same time, however, the line
wire is connected through the clip 15 the ring 9 and tongue 19 to the movable
part of the key 23, the strip 22, the binding screw 21, the wire 29, the screw 35
on the transmitter and bell 34 to earth. Consequently if a ringing current be
sent along the line from the other end of the circuit the bell 34 will be rung.
The battery 31 is in this position disconnected from the circuit by reason of the
fact that the movable member 23 is not touching the strip 26 and the spring
contact 17 is disconnected from the transmitter diaphragm 12. If now the press
button 5 be pushed in, the movable member 23 is caused to make contact with the
strip 26 and thus joins the battery in circuit between the line and earth which
sends a ringing current to the line and causes the bell at a similar station at the
other end of the line to ring.
If the receiver is removed from the transmitter, the spring 17 will be permitted
to make contact with the diaphragm 12 and consequently the battery 31 will
be joined in circuit with the receiver coils 27, the transmitter and the line. The
bell 34 will be disconnected from the line since the ring 9 of the receiver no
longer makes contact with the clip 15.
In Figures 11, 12 and 13 a modified form of receiver is shewn in which the key
for making and breaking the talking circuit is mounted on the receiver magnet 20
and in this case the spring contact 17 in the transmitter is dispensed with and
the transmitter diaphragm permanently connected with the screw 18 which is
insulated from the clip 15. The terminal 24 which is secured to the receiver
magnet is in permanent connection with the movable portion 36 of the talking key,
the other portion 37 of which is permanently connected to the terminal 25;
strip 26 being removed.
An additional orifice 38 is provided in the side of the receiver casing through
which projects a button 39 of any suitable description adapted to engage with the
movable member 36.
The connections of the instrument are shewn in Figure 14, from which it will
be seen that the battery 31 is connected between the screw 18 on the transmitter
to the transmitter diaphragm 12 and carth. Screw 18 is furthermore connected
through wire 40 which forms part of the flexible conductor 41 to terminal 21,
the strip 22 attached to which being normally out of contact with the movable
member 23 of the ringing key. The screw 24 is connected through the wire 42
forming part of the flexible conductor 41, to the screw 35 on the transmitter,
which is also connected to line. The screw 33 on the transmitter is connected
through conductor 28 to one end of the receiver coil 27 as before. The bell 34 is
connected between the clip 14 and the earth as shewn.
In the form of receiver shewn in Figures 11, 12 and 13, the tongue 19 is
dispensed with. The connection between the ring 9 and the bell 34 is ensured
in the following way. The push piece 39 is made of metal and rubs against the
edge of the ring 9, said push piece is also in metallic contact with the movable
member 36 of the talking circuit key which is in direct connection with the
bell 34.
The operation of the apparatus is as follows:-
When the receiver is placed between the clips on the transmitter the bell 34
will be connected to line through the clip 14, the ring 9 of the receiver, push 5
piece 39, movable member 36, terminal 24, wire 42 and screw 35, consequently
a ringing current sent from the other end of the line will ring the bell. If the

page_text: press button 5 be pushed in, the key 23 is caused to make contact with the strip 22
and connects the battery 31 through wire 40, terminal 21, terminal 24 and wire 42
to line sending a ringing current into the line which rings the bell at the other
end, the bell 34 at the home end of the line will also be rung because clip 14 is
connected through the ring 9 of the receiver to screw 24 which is as before stated
connected temporarily with the battery 31. If now the receiver be removed
from the transmitter the bell 34 will be cut out of circuit and if the push button 5
is released and the push button 39 pressed in, the movable contact will be caused
to make connection with the contact 37 and thereby connect the battery 31 through
the transmitter diaphragm, the screw 33, the wire 28 and the receiver coils 27 to
the terminal 24 and thence through the wire 42 to line. When the push button 39
is released the talking circuit is broken.
By using the second arrangement shewn in the drawing in which the key for
the talking circuit is mounted on the receiver, the operator can at any time prevent
his speech being overheard at the other end of the line which is not the same as
the arrangement first described. Furthermore, this construction also prevents
any possibility of the battery being connected to line and thereby wasting current
when the apparatus is not in use.
In a modification the talking circuit key is arranged to break the bell contact
in the receiver when the talking circuit is made. This can be accomplished
by connecting the movable member 23 of the ringing key to a fixed contact
with which the movable member 36 of the talking circuit key normally makes
connection, said member 23 being disconnected from the screw 24. By this means
when the push piece 39 is pressed in the member 36 is pressed away from the
fixed contact above mentioned thereby breaking contact with the member 23 and
makes contact with the member 37.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is: -
1. A telephone receiver in which the coils, ringing key and terminals are all
secured to the circular magnet which forms with its appurtenances a single device
independent of the receiver casing, either with or without a key for the talking
circuit also mounted upon the same magnet.
2. A microphone transmitter in which the microphone is mounted in an insula-
ting ring carrying a pair of clips having a spring contact which breaks the talking
circuit when the receiver is inserted between them.
3. A telephone transmitter constructed substantially as described with reference
to Figures 8 and 9 of the accompanying drawings.
4. A telephone receiver constructed and operating substantially as described
with reference to Figures 5 to 7 or to Figures 11 to 13 of the accompanying
drawings.
Dated the day of July 1899.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C. Patent Agents for the Applicant.