Improved System of Signalling to a Central Point or Station, and Apparatus or Means therefor.
Year: 1892

page_text: Date of Application, 13th Dec., 1892
Complete Specification Left, 5th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improved System of Signalling to a Central Point or Station, and
Apparatus or Means therefor.
A communication by LUCIEN ANSPACH, of 14, Rue de l'Association, Brussels, in
the Kingdom of Belgium, Engineer.
I, WILLIAM PAILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, of 6 Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster and 323 High Holborn, in the County
of Middlesex, Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention has for its object to simplify electric signalling apparatus, by
means of which the exact point from which a certain signal is given to a central
point may be indicated at such central point (which is connected with several
surrounding places), in such a way, that instead of the number of special wires, as
hitherto has been necessary, for connecting the points with an equal number of
special central apparatus, only a single central apparatus, and, consequently, a
single wire, is employed.
The subject of the invention is a means for rendering possible the object in view,
and consists essentially in the employment of a central apparatus which is capable
of reproducing a suitable signal for each separate point connected therewith,
differing from the signals of the other points.
For this purpose, of course, apparatus of any suitable character may be
employed, among which, for instance, that kind produce in a practical manner the
result desired, which allow the difference of the signals to be recognised by ear or
eye, by means of the longer or shorter duration of the signals under the action of
apparatus operated by means of the electric current, such as figure plates,
indicating rollers, striking apparatus, etcetera.
For the purposes of the invention, a transmitting apparatus which is also set in
action by an electric current, is placed at each of the places surrounding the
central point, so that the duration of the signal reproduced by the central apparatus
is determined by the duration of the action of the transmitting apparatus, and, in
order to carry out this operation automatically, both the central apparatus and
each of the transmitting apparatus must be under the action of a driving
mechanism such, for instance, as a clockwork, which, for each of them, is actuated
by an electric current in a suitable manner for conveying a given signal.
It must further be noted that the several transmitting apparatus may not only be
different in construction to the central apparatus, but may differ very considerably
from one another in their mode of construction, and in the following Specification
the first kind of apparatus will be called the "transmitter" and the second the
" receiver."
The transmitter and receiver may be preferably combined in such a way that
besides the signal of given duration, hereinafter called the temporary signal, which
indicates to the receiver the transmitter forwarding the same, a further signal, for
instance, a bell permanently ringing may also be made use of immediately on the
coinmencement of the temporary signal, or even immediately after the termination
of the same, in order to denote by its constant ringing that the temporary signal
had been given, whilst, in order to operate the permanent signal, a further current
independent of the temporary signal, must of course be sent through the wire. As
regards this latter (the wire) it must be noted that whilst following all requisite
directions and curves, it must be brought in closest proximity to the various
transmitters, and of course be connected therewith by as short connections as
possible, whilst the wire forms a suitable circuit either by a return wire or by the earth.

page_text: Among the cases in which the great advantage of such multiple signalling
apparatus is prominently apparent, belongs in the first rank the connection of
houses of a given district or quarter of a town with the corresponding police
station, for instance, in order to immediately convey information to the same of an
attempted burglary in any of the houses, so that the same may be frustrated by
the police immediately hastening to the spot, and therefore in the following
Specification the application of the system for that purpose is described it being
presumed that the signals are started by the unauthorised opening of doors or
windows, by which means the closing of the normally open circuit is produced.
In the simplest arrangement of only a straight line there is the main wire, the
connections, the transmitter and the receiver; whilst a battery or current producer
must also be employed. The actuating of the temporary signal, in combination
with the permanent signal, is kept in sight, and the composition of the conductor
varies according to whether the operation of the above named signal takes place
through only one line or wire, or whether two separate wires may be employed for
the same purpose.
If a separate circuit is to be employed for each signal, the conducting apparatus
must be composed of three wires, whilst the currents work in the following order.
The three currents are conducted from a pole of the battery through the
respective actuating devices or electro magnets of the transmitter receiver and
permanent signal, and the circuit is closed in a suitable manner in order to operate
the same. Current 1 passes through the electro magnet of the transmitter and
returns to the battery by the earth. It is closed only by means of a circuit closer,
inserted in the same of suitable construction, which is set in action by any
unauthorised opening of the doors, and the operating mechanism of the transmitter
is released by which means the contact lever of the same, which is connected by
means of a branch with current 1 is set in rotation, and the current 2, for the
temporary signal, is closed on a radially shaped metal arched piece as well as
current 3 on a further metal arched piece arranged concentrically to the former
one. By closing the circuit 2, the armature of the electro magnet of the receiver
is disengaged and the operating mechanism of the same is started until the lever is
again moved from the first arched piece and thus the current 2 is again opened,
whereby the armature of the receiver is again engaged and the index stops on the
part which indicates the house in which the corresponding transmitter is situated.
Current 3 sets the permanent signal or bell in motion and thereby causes the same
to ring continuously, whilst the lever of the transmitter after it has been
disengaged from the first arched piece rests against a projection on the second
arched piece.
In order to render the conducting apparatus, more simple, the three currents may
be sent through a single wire, but in that case the strength of the same must be
regulated by the insertion of resistances in currents 1 and 3 in such a way that the
current passing through 3 is still capable of operating the above named bell, but
cannot exercise any further influence on the temporary signal. If both signals are
operated by the same circuit 2, the curved piece is omitted and is replaced by the
simple contact piece arranged in the same line as the first arched piece and
connected with 2 by a branch line 2ª. These two currents are in this case also
graduated by the insertion of a resistance in 2ª for the object previously described.
If the circuit 2 be omitted in order to utilise only a single wire, the connection
must be slightly modified.
The transmitter may be as follows―
An operating mechanism is provided on the central axis of which a lever
oscillates. One end of the same engages with the armature hook of the electro-
magnet, whilst at the other end two friction springs close the current on two curved
metal pieces. If the temporary signal is to be conveyed intermittently instead of
in a continuous manner, which is of importance when the signal is only to be used
as an oral one, one of the curved pieces is made with projections of insulating
material, so that if the receiver is a bell for instance, the hammer of the same will

page_text: strike, or be operated by the actuating mechanism as often as a spring encounters
the metal divisions and will thus indicate the sending transmitter by the number of
strokes. Instead of the permanent signal being conveyed through the second
curved piece or a projection, this could also take place by the arrangement of a
suitably formed contact lever or by the pressing of a contact piece on a projection
by means of a spring when the lever is disengaged, and in this case a wire 4
replaces the wire 3. The temporary signal could be conveyed through the toothed
wheel of the clockwork directly instead of through the curved piece. In this case, the
circuit is closed each time the teeth come in contact with the driving armature, whilst
in order to limit the duration of the signal an insulated catch projects from a suitable
tooth and stops the movement. The following are two forms of construction of the
transmitter in another arrangement. The transmitter in the first form may consist
of a cylinder filled with liquid on which a piston presses. The piston rod is
provided with two spring contacts which cause the current to close on two straight
plates. A tube at the lower end of the cylinder is provided with a cock which is
kept closed by means of the armature of an electro magnet which a spring acts
against. When the same is disengaged the circuit 4 is closed by the contact of the
cock with a stop and the current is transferred by means of the cylinder, the piston
and piston rod to the springs or the plates, whilst the piston descends by the water
running out.
The second form is a similar one. In this the piston is replaced by a float, and
the latter is suspended on the short arm of the oscillating contact lever. The liquid
in the vessel is always maintained at the same level by means of the reversed
reservoir, and the outflow of the same is effected by the cock operated in the
manner hereinbefore described, whereupon the float descends, and the lever closes
the various circuits. In case the opening of the doors is unauthorised, measures
must be taken so that needless alarming of the police at the central office may be
avoided. For this purpose, the operating mechanisms of the transmitters are so
arranged that the action of the lever after the closing of the circuit 1 by the
adjustment of the circuit closing device on the opening of the door, is delayed for
a short time say about 15 seconds, to allow the person entering to turn off during
this interval a further current breaker arranged near the door in current 1, in other
words, to again break the closed circuit, and thereby to prevent the movement of
lever on the flowing of the current operating the signals.
An elementary arrangement for this purpose is the arrangement of the breaker
in a closed box for which the person entering has the key, and may open the box to
adjust the circuit breaker. This arrangement is however not a practical one, as
the certain turning off cannot always be effected in the short time of 15 seconds.
An arrangement fully fulfilling this object consists in a circuit breaker based on
a combination of letters or numbers. When this arrangement is employed, current 1
is then divided into two branch currents 1 and 1b and in each of them an electro-
magnet inserted, current 1" being normally closed and current 1 being normally
open. The ends of the two circuits are connected with the contact pieces of two
breakers inserted in circuit 1. If one of the two breakers be operated, the current
passes through the corresponding electro magnet which attracts its armature, and
If on the other
allows the catch to drop, or in other words breaks the circuit.
hand the other breaker be operated, the other catch drops on the contact arranged
beneath it and closes the circuit.
If now it be so imagined that the circuit breakers instead of being composed of
a single handle with a suitable contact, are composed of a subdivided number of
handles, for instance, ten, and an equal number of contacts which are connected by
an equal number of wires with further interchangeable contact pieces to which the
circuits 1, 1, 1 are attached, the latter lying hid on a plate, whilst the former are
arranged on an uncovered fixed plate, they (the circuit breakers) may be combined
with one another in such a way that, for instance, by the closing of two handles on
their contacts 1 and 3, circuit 1". is broken whilst the adjustment of all the others
closes circuit 1. Now the person entering alone knows the secret number, in this

page_text: case 13, which prevents the apparatus operated when the door is opened from
acting whilst a person not knowing the same not only does not break the circuit 1
but also sets going the current 1.
For closing or breaking the circuit at the inner doors and the windows, the inner
conducting wire is passed through circuit breakers of such a form that the circuit
is closed or broken by the insertion of a piece of metal, such for instance as the
key of the door in question. If several of such circuit breakers on various doors
are to be connected with one another and with further automatic circuit closers,
this can be done in a suitable manner by a suitable arrangement of parts. If such
circuit breakers are inaccessible after the door has been closed, they may be
combined with a further closing device, which may be attached to a suitable knob,
in order to close the circuit by pulling the same.
Another eventuality to be avoided, is that of preventing a person who might
break into the house from cutting the house wire without this circumstance being
immediately signalled to the central office. For this object the end of the
conducting apparatus is connected with the earth through a strong resistance so
that a weak but permanent current is maintained in the conducting wire which
passes simultaneously through a suitably arranged electromagnet, and thereby
permanently attracts its armature. If the current be then interrupted by the
cutting of the conducting wire, the armature drops onto a contact piece, and closes
the circuit of a particular signal which denotes the severance of the main
conducting wire.
In addition to actuating the temporary or permanent signal at the central office,
the transmitter may also operate a local signal which becomes visible on the outside
of the house, for instance by passing a wire, suitably branching from the current
for operating the temporary signal, through an electromagnet, the armature of
which, when the circuit is open, keeps a box closed in which a rolled up flag is
placed, whilst on the closing of the circuit or the starting of the temporary signal,
the bex is opened by the pulling or drawing of the armature and the unrolling
or displaying of the flag is caused so that this latter indicates even at a distance
the house being entered.
Dated this 12th day of December 1892.
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COME DEI DI POLICATION.
Improved System of Signalling to a Central Point or Station, and
Apparatus or Means therefor.
A communication by LUCIEN ANSPACH, of 14, Rue de l'Association, Brussels, in
the Kingdom of Belgium, Engineer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors 6 Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster and 323 High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention has for its object to simplify electric signalling apparatus, by
means of which the exact point from which a certain signal is given to a central
point may be indicated at such central point (which is connected with several
surrounding places), in such a way, that instead of the number of special wires, as
hitherto has been necessary, for connecting the points with an equal number of
special central apparatus, only a single central apparatus, and, consequently, a
single wire, is employed.
The subject of the invention is a means for rendering possible the object in view,

page_text: and consists essentially in the employment or a central apparatus which is capable
of reproducing a suitable signal for each separate point connected therewith,
differing from the signals of the other points.
For this purpose, of course, apparatus of any suitable character may be employed,
among which, for instance, that kind produce in a practical manner the result
desired, which allow the difference of the signals to be recognised by ear or eye,
by means of the longer or shorter duration of the signals under the action of
apparatus operated by means of the electric current, such as figure plates,
indicating rollers, striking apparatus, etcetera.
For the purposes of the invention, a transmitting apparatus, which is also set in
action by an electric current, is placed at each of the places surrounding the
central point, so that the duration of the signal reproduced by the central apparatus
is determined by the duration of the action of the transmitting apparatus, and, in
order to carry out this operation automatically, both the central apparatus and each
of the transmitting apparatus must be under the action of a driving mechanism,
such, for instance, as a clock work, which, for each of them, is actuated, by an
electric current in a suitable manner for conveying a given signal.
It must further be noted that the several transmitting apparatus may not only
be different in construction to the central apparatus, but may differ very con-
siderably from one another in their mode of construction, and in the following
Specification the first kind of apparatus will be called the "transmitter" and the
second the "receiver."
The transmitter and receiver may be preferably combined in such a way that,
besides the signal of given duration, hereinafter called the " temporary signal,"
which indicates to the receiver the transmitter forwarding the same, a further
signal, for instance a bell permanently ringing, may also be made use of,
immediately on the commencement of the temporary signal, or even immediately
after the termination of the same, in order to denote, by its constant ringing, that
the temporary signal had been given, whilst, in order to operate the permanent
signal, a further current, independent of the temporary signal, must, of course, be
sent through the wire. As regards this latter (the wire) it must be noted that,
whilst following all requisite directions and curves, it must be brought in closest
proximity to the various transmitters, and of course be connected therewith by as
short connections as possible, whilst the wire forms a suitable circuit either by a
return wire or by the earth.
Among the cases in which the great advantage of such multiple signalling
apparatus is prominently apparent belongs, in the first rank, the connection of
houses of a given district or quarter of a town with the corresponding police station,
for instance, in order to immediately convey information to the same of an
attempted burglary in any of the houses, so that the same may be frustrated by
the police immediately hastening to the spot, and therefore, in the following
Specification, the application of the system for that purpose is described, it being
presumed that the signals are started by the unauthorised opening of doors or
windows, by which means the closing of the normally open circuit is produced by
operation of a suitably arranged electro-magnet.
On the accompanying drawing
:―
Figure 1 shows a diagram of the arrangement in its simplest form, that is to say,
in a straight line.
Figures 2 and 3 are modifications of the combination of transmitter and receiver
in which the permanent signal is started simultaneously with the temporary signal.
Figures 2 and 3, the same modifications in which the starting of the permanent
signal only takes place immediately on the cessation of the temporary signal.
Figures 4, 5, 6 and 7 show various modes of constructing the transmitter and the
details belonging thereto.
Figures 8 and 8 and 9 show simple and combined circuit breakers placed beside
the house door.
Figure 10 shows the circuit breaker or closer for inner doors.

page_text: Figure 11 suows an arrangement of the inner condtering wires for comomong
several of these breakers with automatic closers.
Figure 12 shows an arrangement for effecting the closing of the circuit when the
door is shut.
Figure 13 shows an arrangement for signalling in case of the cutting of the
outside wire.
Figure 14 shows a detail belonging to a signal visible on the outside of the
house.
In Figure 1-
X is the main wire, the connections, a the transmitters, and the receiver;
A is the battery or current producer. The ordinary telephone lines may also be
employed for connections or even they may be used for connecting directly with
the receiver in case a single general circuit is not available.
In the examples shown, the actuating of the temporary signal, in combination
with the permanent signal, is kept in sight, and the composition of the conductor
varies according to whether the operation of the above named signal takes place
through only one line or wire, or whether two separate wires may be employed for
the same purpose.
If a separate circuit is to be employed for each signal, the conducting apparatus
must be composed of three wires, whilst the currents work in the following order
(Figures 2 and 3) :-
The three currents are conducted from a pole of the battery A through the
respective actuating devices or electro-magnets of the transmitter, receiver and
permanent signal, and the circuit is closed in a suitable manner in order to operate
the same.
Current passes through the electro-magnet E of the transmitter,
and returns to the battery by the earth. It is closed only by means of a circuit
closer, inserted in the same, of suitable construction, which is not shown, which is
set in action by any unauthorised opening of the doors, and the operating
mechanism of the transmitter is released, by which means the contact lever L of
the same, which is connected by means of a branch with 1, is set in rotation, and
the current 2, for the temporary signal, is closed on the radially shaped metal
arched piece A, as well as current 3 on a metal arched piece B arranged con-
centrically to A. By closing the circuit 2, the armature of the electromagnet of
the receiver H is disengaged, and the operating mechanism of the same is started,
until lever L is again moved from A, and thus the current 2 is again opened,
whereby the armature of H is again engaged and the index stops on the part
which indicates the house in which the corresponding transmitter is situated.
Current 3 sets the permanent signal or bell S in motion and thereby causes the
same to ring continuously, whilst lever L of the transmitter, after it has been
disengaged from A, rests against a projection a on the part B, Figure 4.
In order to render the conducting apparatus more simple, the three currents may
be sent through the single wire 1, but, in that case, the strength of the same must
be regulated by the insertion of resistances R2 R³ in currents 1 and 3 in such a
way that the current passing through 3 is still capable of operating the above
named bell, but cannot exercise any further influence on the temporary signal,
Figure 3.
If both signals H and S are operated by the same circuit 2, Figure 2A, the
curved piece B is omitted, an1 is replaced by the simple contact piece A', arranged
in the same line as A, and connected with 2 by the branch line 2". These two
currents are, in this case, also graduated by the insertion of a resistance in 2, for
the object previously described. If the circuit 2 be omitted, in order to utilise
only a single wire, the connection is arranged as shown in Figure 3ª.
In Figure 4, the transmitter is shown in more detail. H is an operating
mechanism, on the central axis of which the lever Loscillates. One end of the
same engages with the armature hooks of the electromagnet E, whilst, at the other
end, two friction springs close the current on the curved metal pieces A and B.
If the temporary signal is to be conveyed intermittently instead of in a continuous

page_text: manner, which is of importance when the signal is only to be used as an oral one,
the curved piece A is made with projections of insulating material, so that, if the
receiver is a bell for instance, the hammer of the same will strike, or be operated
by, the actuating mechanism as often as the spring encounters the metal divisions
and will thus indicate the sending transmitter by the number of strokes. Instead
of the permanent signal being conveyed through the curved piece 13 or the
projection A', this could also take place by the arrangement of a suitably formed
contact lever or by the pressing of the contact piece C on the projection D by
means of a spring when the lever L is disengaged, and, in this case, the wire 4
replaces the wire 3. The temporary signal could be conveyed through the toothed
wheel of the clockwork directly, as shown in Figure 5, instead of through the
curved piece. In this case, the circuit is closed each time the teeth come in
contact with the driving armature, whilst, in order to limit the duration of the
signal, an insulated catch projects from a suitable tooth and stops the movement.
Figures 6 and 7 are forms of construction of the transmitter in another arrange-
ment. The transmitter in Figure 6 consists of a cylinder filled with liquid, on
which the piston P presses. The piston rod is provided with two spring
contacts which cause the current to close on the straight plates A and B.
A tube at the lower end of the cylinder is provided with a cock, which is kept
closed by means of the armature of an electromagnet which the spring 4 acts
against. When the same is disengaged, the circuit 4 is closed by the contact
of 2" with P, and the current is transferred by means of the cylinder, the piston
and piston rod to the springs or the plates A and B or A and A', whilst the
piston descends by the water running out.
The arrangement shown in Figure 7 is a similar one. In this, the piston is
replaced by a float F, and the latter is suspended on the short arm of the
oscillating contact lever L'. The liquid in the vessel is always maintained at
the same level by means of the reversed reservoir R, and the outflow of the.
same is effected by the cock operated in the manner herein before described,
whereupon the float descends, and lever L' closes the various circuits through A B.
In case of the ordinary opening of the door, measures must be taken so that
needless alarming of the police at the central office may be avoided. For this
purpose, the operating mechanisms of the transmitters are so arranged that the
action of the lever L, after the closing of the circuit 1 by the adjustment of the
circuit-closing device (which is not shown) on the opening of the door, is delayed
for a short time, say about 15 seconds, to allow the person entering to turn off
during this interval a further current breaker I arranged near the door in current 1,
in other words, to again break the closed circuit, and thereby to prevent the
movement of lever L, or the flowing of the current operating the signals.
An elementary arrangement for this purpose is the arrangement, Figure 8, of
the breaker I in a closed box, for which the person entering has the key, and
may open the box to adjust the circuit breaker. This arrangement is, however,
not a practical one, as the certain turning off cannot always be effected in the
short time of 15 seconds.
An arrangement fully fulfilling this object consists in a circuit breaker,
Figures 8 and 9, based on a combination of letters or numbers. When this
arrangement is employed, current 1 is then divided into two branch currents 1"
and 1, and in each of them an electromagnet E* and E' is inserted, current 1ª
being normally closed and current 1 being normally open.
The ends of the two
circuits are connected with the contact pieces of two breakers I and I",
inserted in circuit 1. If I be operated, the current passes through the electro-
magnet Ea, which attracts its armature, and allows the catch to drop, or in other
words breaks the circuit. If, on the other hand, 1b be operated, the catch c
drops on the contact arranged beneath it and closes the circuit.
It now it be so imagined that the circuit breakers I I, instead of being com-
posed of a single handle with a suitable contact, are composed of a subdivided
number of handles, for instance, ten, Figure 9, and an equal number of contacts,

page_text: which are connected by an equal number of wires with further interchangeable
contact pieces to which the circuits 1, 1ª, 1 are attached, the latter lying bid on a
plate T, whilst the former are arranged on an uncovered fixed plate T, they (the
circuit breakers) may be combined with one another in such a way that, for
instance, by the closing of two handles on their contacts 1 and 3, circuit 1ª is
broken, whilst the adjustment of all the others closes circuit 1. Now the person
entering, alone knows the secret number, in this case 13, which prevents the
apparatus operated when the door is opened from acting, whilst a person not
knowing the same not only does not break the circuit 1 but also sets going the
current 1b.
For closing or breaking the circuit at the inner doors and the windows, the
inner conducting wire is passed through circuit breakers i, which assume preferably
the form shown in Figure 10, because, in this case, the circuit is closed or broken
by the insertion of a piece of metal, such, for instance, as the key of the door in
question. If several of such circuit breakers on various doors are to be connected
with one another and with further automatic circuit closers a, this can be done in
a suitable manner by an arrangement such as is shown for instance in Figure 11.
If such circuit breakers are inaccessible after the door has been closed, they may
be combined with a further closing device, which may be attached to a suitable
and convenient knob, Figure 12, in order to close the circuit by pulling the same.
Another eventuality to be avoided is that of preventing a person, who might
break into the house, from cutting the house wire without this circumstance being
immediately signalled to the central office. For this object, the end of the con-
ducting apparatus is connected with the earth through a strong resistance, so that
a weak but permanent current is maintained in the conducting wire, which passes
simultaneously through a suitably arranged electro-magnet, and thereby per-
manently attracts its armature. If the current be then interrupted by the cutting
of the conducting wire, the armature drops onto a contact piece, and closes the
circuit of a particular signal which denotes the severance of the main conducting
wire, Figure 13. The resistance is preferably placed at the central station, but
in this case the principal line must be looped in order to be brought back to
there.
In addition to actuating the temporary or permanent signal at the central office,
the transmitter may also operate a local signal which becomes visible on the
outside of the house, for instance, by passing a wire suitably branching from
the current for operating the temporary signal, through an electro-magnet, the
armature of which, when the circuit is open, keeps a box closed in which a rolled
up flag is placed, whilst, on the closing of the circuit, or the starting of the
temporary signal, the box is opened by the pulling or drawing of the armature
and the unrolling or displaying of the flag is caused, so that this latter indicates,
even at a distance, the house being entered (Figure 14).
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is-
1. An arrangement for multiple signalling through a single conducting cable,
characterised by the switching of any suitable number of transmitters into the
circuit passing through a single receiver arranged in a central office, in such a way
that the normally open circuit is only closed on the transmitters, which thereby
actuate the receiver in such a way that the same yields, for each separate
transmitter, a particular signal, for the purpose of exactly indicating the place
from which the signal is sent.
2. In the signalling apparatus arranged in the manner described in Claim 1, the
operating of the transmitter and receiver by means of driving mechanism, and the
electrical connection of the same with one another in such a way that only the first
trausnitter automatically operated by the closing of the main circuit causes the
current to flow through and release the driving mechanism of the receiver, and

page_text: thereby sets the latter automatically in action during a like space of time to that
of the particular signal.
3. In order to prevent the current of a permanent signal set in action
simultaneously with the temporary signal still affecting the receiver after the
cessation of the temporary signal; the regulating of the currents by the branching:
of the wires and insertion of suitable resistances.
4. The simultaneous operation, by means of the transmitter, of the signal at the
central office and a signal visible at the place itself.
5. The arrangement for turning off the current, characterised by the division of
the same over two wires, and the insertion in one of them of an electromagnet in
combination with an interrupter, or circuit closer, respectively, based on a
combination of letters or numbers.
6. For the object of signalling any severance of the house wire, the formation
in the same of a weak permanent current by connecting the ends of the conducting
wire with the earth through strong resistances, and combining the same with a
particular circuit, in which the signal is inserted which is operated by the breaking.
of the weak current.
Dated thin 4th day of Santomboy 1802
WM. P. THOMPSON & Co.,.
Agents for the Applicant.