Improvements in Signalling, Indicating, or Communicating between Police or others in Cities or other Places, and in Means or Apparatus Employed therein.
Year: 1887

page_text: This Specification was, upon the 28th day of August 1889, Amended under
Sections 18 to 21 of the Patents, Designs, and Trade Marks Act, 1883.
Date of Application, 22nd Mar., 1887-Accepted, 3rd May, 1887
Improvements in Signalling, Indicating, or Communicating between
Police or others in Cities or other Places, and in Means or
Apparatus Employed therein.
I JOHN CORNELIUS WILSON of 51 State Street Boston in the State of Massachusetts
one of the United States of America 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:-
This invention has for its object to construct a signalling apparatus especially
applicable to police signalling where signals of different characters or significance are
transmitted from the substations to the central station, and are recorded and an
audible alarm is sounded for certain signals, and not for others indicative of the
importance of the message. The invention is an improvement upon English Letters
Patent No. 2799 dated Mar. 3rd. 1885.
In accordance with this invention the sub-station is provided with a transmitting
apparatus constructed and arranged to produce while the box-door is closed, a series
of short changes in the circuit followed by a prolonged change, and to produce while
the box-door is open, a series of short changes in the circuit, or a series of short
changes followed by a prolonged change.
The transmitting apparatus, in this instance, consists of a series of break wheels
mounted upon a shaft, and set in motion to revolve one complete revolution by a
suitable motor; a series of pens to be moved into contact with the break-wheels one
at a time and a selecting cylinder provided with projections upon its surface to cause
one or another of the pens to come in contact with a break-wheel as desired, such a
transmitting apparatus being substantially such as shown in the patent referred to.
In this instance, the citizen's signal is transmitted with the box-door closed, and
the patrol signal with the box-door open, consequently two pens insulated from each
other and connected with branch wires controlled as to their connection with the main
line by a switch, will normally be in contact with two of the break-wheels; and any
special signal is transmitted with the box-door open, the selecting cylinder being
moved to bring one or another contact pen into contact with a break-wheel.
Each break-wheel is notched or provided with insulated portions to change the
condition of the circuit a sufficient number of times to indicate the box number, and
also if desired additional notches or insulated portions are supplied to indicate any
Dim Q11

page_text: suitable signal as for instance a special signal, and in this instance each break-wheel
arranged for sending special signals and also that one arranged for sending the
citizens signal is provided with a long notch or insulated portion, so that a series of
short interruptions, or a series of short interruptions followed by or preceded by a
long interruption is transmitted.
At the receiving station a relay is included in the circuit, the armature of which
controls a local circuit, containing a suitable receiving instrument to receive the
message, and another relay is also included in the main circuit the armature of which
moves an engaging lever back and forth into and out of engagement with a moving
toothed wheel, said engaging lever being loosely connected with the opposite end of
the armature, so that when thrown into engagement with the toothed-wheel, and
retained for a short time, as for instance upon a prolonged interruption of the current,
the said lever is moved upward by the toothed-wheel in order that a latch or
annunciator drop may be released to close a local circuit containing an audible alarm,
and in this instance the special signal and the citizens signal being transmitted by a
break-wheel having a long notch or insulated portion thereon, the audible alarm is not
sounded in conjunction with the patrol signal. A time and dating stamp is also
provided set in operation upon the reception of each signal for stamping the exact
time and date upon the strip of paper upon which the signals are recorded.
The drawing shows in diagram the transmitting apparatus of the sub-station and
the receiving apparatus at the main or central station.
The sub-station indicated by S, contains a suitable multiple transmitting apparatus
for transmitting several different signals, in this instance it being shown as containing
a series of break-wheels mounted upon a shaft a, a series of contact pens attached to a
block a', and arranged to co-operate respectively with the break-wheels, a selecting
cylinder b having a series of projections b' about its surface, to determine which one
of the said contact pens shall remain in contact with its break-wheel, such a transmitting
apparatus being substantially as shown in the patent above referred to.
A pointer, shown in dotted line, is fast to the selecting cylinder b moving over a
dial upon the face plate of the box, the position of the pointer indicating the desired
signal and which pen shall come in contact with the break-wheel.
A suitable motor, not shown, is employed to rotate the break-wheel shaft one
complete revolution when set in operation.
The transmitting apparatus is constructed and designed to transmit three classes of
signals, first a citizens signal with the box-door closed; second, a patrol signal with
the box-door open; and third, any special signal desired by an officer with the box-
door open, such special signal being determined by the position of the pointer.
To effect this result, a contact pen is normally in contact with the citizens break-
wheel C, and a contact pen is also normally in contact with the patrol break-wheel, c',
while the remaining contact pens are disengaged.
The contact pens of the citizens and patrol break-wheels are insulated from each
other, and are connected respectively by branch wires 2, 3, with the main line, but
controlled by the spring-controlled switch A, controlled in turn by the opening and
closing of the door of the box, so that with the box-door closed, the branch 2, is
connected with the main line, as shown in the drawing, to thus transmit the citizens
signal while the branch 3 is cut out and when the box-door is open the branch 3 will
be connected with the main line and branch 2 will be cut out.
At the receiving station a relay R is included in the main line with the battery B,
the armature R¹ of the said relay controlling a local circuit R² including a receiving
instrument, in this instance, shown as an ordinary recorder R³, the relay R being
responsive to the changes of the circuit, the recorder will record all the messages.
A relay T is also included in the main circuit, its armature T¹ being carried by a
lever T2 pivoted at 20 and said lever T2 has pivoted to its opposite end an engaging
lever which follows upon a loop or guideway ', attached to any suitable frame-work,
the said engaging lever being beveled or sharpened at its end to engage the teeth of
the moving wheel t², carried continuously by any suitable motor, or it may, if desired,
be attached to one of the shafts of the recorder R³.

page_text: As the armature " of the relay T is released, the engaging lever is thrown into
the engagement with the toothed-wheel t", and as the armature is again retracted, the
said engaging lever is withdrawn thus moving back and forth as the condition of the
current is changed.
As it is desirous to sound an audible alarm to give warning upon the reception of
certain signals, as for instance, a citizens signal, or any special signals, and not upon
the reception of the patrol signal, those break-wheels operating to transmit a signal
requiring a warning alarm are cut away or insulated upon their peripheries for a
portion of their length to thus produce a prolonged interruption or change in the
condition of the circuit, which will cause the armature T' of the relay T to be retracted
for a longer interval of time to permit the engaging levert to engage the toothed
wheel and be moved upward by the said wheel, until a hooked portion ³ attached
to the said levert, engages a latch or annunciator drop t, releasing the latter, and
closing a local circuit », containing a vibrator or other suitable bell B thus giving an
audible warning for any signal being transmitted with a prolonged change.
In this instance the signal is transmitted followed by the prolonged change, as will
he seen upon referring to the citizens break-wheel c, and just before the break-wheels
cease to rotate, the circuit is again closed, restoring the same to its normal condition,
at which time the armature T is attracted and the engaging levert is withdrawn and
restored to its normal position, leaving the latch to be replaced by the attendant, or
any suitable automatic means may be employed to replace the latch .
To transmit the patrol signal it not being desirable that the audible aların should be
sounded, the box number is simply transmitted, while the remaining portion of the
wheel is not cut away, so that the engaging lever t is merely vibrated back and forth,
and not retained in engagement with the toothed wheel a sufficient length of time
to be raised to thereby release the annunciator drop.
While I have herein shown the toothed wheel t² as continuously moved by a motor,
it is obvious that the same may be mounted upon one of the shafts of the recorder,
and thus moved intermittingly.
It is obvious that instead of transmitting the signal followed by a prolonged change
in the condition of the circuit, as herein shewn, the reverse of this operation may be
carried out with the same result.
While I have herein shown a toothed wheel for moving a pivoted lever upward to
effect the operation of an audible alarm it is obvious that other mechanism under the
control of the relay T and capable of being brought into operation upon a prolonged
change of the circuit may be employed without departing from the essence of this
invention.
It is obvious that instead of changing the condition of the circuit by total interrup-
tions as described, any other well known means may be employed without departing
from the invention.
The recorder R³ comprises an actuating magnet a paper strip and motor mechanism
for moving the strip only during the time the message is being received.
The time stamp composed of a dial 30 and indicators hands or pointers 31, carried
by au arbor 32, having its bearings in a bed 33 and a presser 34 and suitable
actuating devices, not shown, for rotating the indicators or hands referred to, said
stamp being placed adjacent to the recorder.
The paper strip upon which the inessage is recorded is fed between the dial and the
presser.
The presser 34 is secured to an armature bar 35 of an electro-magnet 36, so that
when the said magnet is energized, the presser 34 will be moved.
I have herein shown a magnet for the register as included in an electric circuit R²
containing a battery, said circuit being controlled by the armature of a relay R
included in the main electric circuit containing a battery B.
A relay 10 is also included in the circuit 2, the armature 12 of this relay has a
detent which enters a notch cut in a wheel 13 controlled by a suitable spring, so that
when the armature is retracted, the wheel will be released, and thereby rotated.
A stud 14 projecting laterally from a wheel 13 strikes, during the rotation of

page_text: the wheel, a pen 15, closing a circuit 16 containing a battery 17, thereby causing
the magnet 36 to move the presser against the paper.
The strip of paper is fed forward by the registering apparatus at each time that
the recorder operates to receive a message, and it will be seen that at such time the
time stamp will thus be actuated to print the time upon the paper.
As herein shown the message will be recorded upon one side of the paper, and the
time upon the other side, but while I consider this arrangement most desirable, it is
obvious that the time may be printed upon the same side that the message is
recorded.
By this apparatus a message coming from a distant point may be recorded, together
with the time of its reception, upon a single strip of paper which is moved only at the
time the message is received.
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 :-
1. In a system for transmitting signals from one station to another a transmitting
apparatus constructed and arranged to produce a series of short changes in the con-
dition of the circuit and a prolonged change, also a series of short changes as
described, a relay responsive to such changes in the circuit and a receiving
instrument controlled by said relay, another relay also responsive to such changes in
the circuit and means controlled by the last named relay for effecting the operation of
an audible alarm or warning signal only upon the occurence of the prolonged change,
substantially as described.
2. In a system for trausmitting signals from one station to another, a transmitting
apparatus constructed and arranged to transmit a series of total interruptions and a
prolonged interruption, and also a series of total interruptions as described, a relay
responsive to such interruptions of the circuit and a receiving instrument controlled
by said relay, another relay also responsive to such interruptions of the circuit, and
means controlled by the armature of the last named relay for closing a local circuit
containing an audible alarm or warning signal only upon the occurence of the prolonged
interruption, substantially as described.
3. In an electric circuit a transmitting apparatus constructed and arranged to
produce a series of changes of short duration in the condition of the circuit, also a
series of short changes and a prolonged change, combined with a receiving instrument
responsive to such changes in the circuit, and an audible alarm responsive to the
prolonged change only, substantially as described.
4. The method herein described of operating at will either a message receiving
instrument, or a message receiving instrument and an audible alarm or indicating
signal connected with the same circuit, which consists in changing the condition of the
current for a period of short duration to operate the message receiving instrument,
and in changing the condition of the current for a period of long duration to operate
both the said message receiving instrument and the audible alarm.
5. In an electric circuit connecting two stations, circuit controlling devices at the
transmitting station for changing the condition of the current to produce impulses of
short and long duration at will, combined with the receivers located at the receiving
station, one of which responds to the impulses of short duration, and the other
responds to the impulses of long duration only, substantially as described.
6. In a municipal telegraph system, an electric circuit connecting a main and one
or more sub-stations, and a signal transmitter at each sub-station containing circuit
controlling devices which change the condition of the circuit for intervals of short
duration and long duration at will, combined with a message recording instrument at
the main station which receives the signals transmitted, and an audible alarm also
located at the main station responsive only to the long changes produced by the
circuit controlling devices at the sub-stations, whereby a warning signal may be
sounded for some and not for other signals at the will of the operator, as set forth.
7. In a message and time recorder, the registering mechanism, and paper moving
mechanism adapted to move the paper only during the time the message is being

page_text: received, combined with a time stamp automatically actuated at each time a message
is received to thereby print the time upon the paper, substantially as described.
8. In a message and time recorder, the registering mechanism, and paper moving
mechanism, combined with a time stamp and electro-magnet for actuating it to print
the paper, a circuit changer 12, 13, and the relay 10 all substantially as described.
9: A signal box containing a transmitting apparatus constructed and arranged to
transmit an unimportant signal, as the box-number, and an important signal as one
of a series of special signals in conjunction with the box number, a door closing the
box and means concealed by the door for actuating the transmitter to transmit signals
of either kind, combined with recording apparatus at the central station for recording
the different signals transmitted, and an alarm or indicating mechanism for
distinguishing the important from the unimportant recorded messages, substantially
as described.
10. A signal box containing a transmitting apparatus constructed and arranged to
transmit an unimportant signal, as the box number, and an important signal as one of
a series of special signals in conjunction with the box number, a door closing the box
and means concealed by the door for actuating the transmitter to transmit signals of
either kind, and means accessible from the exterior of the box for actuating the
transmitter to transmit one signal only, combined with recording apparatus at the
central station for recording the different signals transmitted, and an alarm or
indicating mechanism for distinguishing the important from the unimportant recorded
messages, substantially as described.
11. A municipal telegraph system, wherein are combined a transmitting station
and a receiving station connected by an electric circuit, a multiple transmitting
apparatus located at the transmitting station and constructed and arranged to transmit
important and unimportant signals, a receiving instrument located at the receiving
station responsive to the different signals and an audible alarm or heralding signal
arranged to respond to important signals only, substantially as described.
12. In an electric circuit transmitting mechanism-operative to transmit different
signals, combined with receiving mechanism for receiving the signals, and an audible
alarm responsive to the reception of some of the signals and not others, substantially
as described.

page_text: Date of Application, 22nd Mar., 1887.
Specification Accepted, 3rd May, 1887.
Improvements in Signalling, Indicating, or Communicating between
Police or others in Cities or other Places, and in Means or
Apparatus Employed therein.
I JOHN CORNELIUS WILSON of 51 State Street Boston in the State of Massachusetts
one of the United States of America 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:-
This invention has for its object to construct a signalling apparatus especially
applicable to police signalling where signals of different characters or significance are
transmitted from the substations to the central station, and are recorded and an
audible alarm is sounded for certain signals, and not for others indicative of the
importance of the message. The invention is an improvement upon English Letters
Patent No. 2799 dated Mar. 3rd. 1885.
In accordance with this invention the sub-station is provided with a transmitting
apparatus constructed and arranged to produce while the box-door is closed, a series
of short changes in the circuit followed by a prolonged change, and to produce while
the box-door is open, a series of short changes in the circuit, or a series of short
changes followed by a prolonged change.
The transmitting apparatus, in this instance, consists of a series of break wheels
mounted upon a shaft, and set in motion to revolve one complete revolution by a
suitable motor; a series of pens to be moved into contact with the break-wheels one
at a time and a selecting cylinder provided with projections upon its surface to cause
one or another of the pens to come in contact with a break-wheel as desired, such a
transmitting apparatus being substantially such as shown in the patent referred to.
In this instance, the citizen's signal is transmitted with the box-door closed, and
the patrol signal with the box-door open, consequently two pens insulated from each
other and connected with branch wires controlled as to their connection with the main
line by a switch, will normally be in contact with two of the break-wheels; and any
special signal is transmitted with the box-door open, the selecting cylinder being
moved to bring one or another contact pen into contact with a break-wheel.
Each break-wheel is notched or provided with insulated portions to change the
condition of the circuit a sufficient number of times to indicate the box number, and
also if desired additional notches or insulated portions are supplied to indicate any
C

page_text: suitable signal as for instance a special signal, and in this instance each break-wheel
arranged for sending special signals and also that one arranged for sending the
citizens signal is provided with a long notch or insulated portion, so that a series of
short interruptions, or a series of short interruptions followed by or preceded by a
long interruption is transmitted.
At the receiving station a relay is included in the circuit, the armature of which
controls a local circuit, containing a suitable receiving instrument to receive the
message, and another relay is also included in the main circuit the armature of which
moves an engaging lever back and forth into and out of engagement with a moving
toothed wheel, said engaging lever being loosely connected with the opposite end of
the armature, so that when thrown into engagement with the toothed-wheel, and
retained for a short time, as for instance upon a prolonged interruption of the current,
the said lever is moved upward by the toothed-wheel in order that a latch or
annunciator drop may be released to close a local circuit containing an audible alarm,
and in this instance the special signal and the citizens signal being transmitted by a
break-wheel having a long notch or insulated portion thereon, the audible alarm is not
sounded in conjunction with the patrol signal. A time and dating stamp is also
provided set in operation upon the reception of each signal for stamping the exact
time and date upon the strip of paper upon which the signals are recorded.
The drawing shows in diagrain the transmitting apparatus of the sub-station and
the receiving apparains at the main or central station.
The sub-station indicated by S, contains a suitable multiple transmitting apparatus
for transmitting several different signals, in this instance it being shown as containing
a series of break-wheels mounted upon a shaft a, a series of contact pens attached to a
block a, and arranged to co-operate respectively with the break-wheels, a selecting
cylinder having a series of projections about its surface, to determine which one
of the said contact pens shall remain in contact with its break-wheel, such a transmitting
apparatus being substantially as shown in the patent above referred to.
A pointer, shown in dotted line, is fast to the selecting cylinder moving over a
dial upon the face plate of the box, the position of the pointer indicating the desired
signal and which pen shall como in contact with the break-wheel.
A suitable motor, not shown, is employed to rotate the break-wheel shaft one
complete revolution when set in operation.
The transmitting apparatus is constructed and designed to transmit three classes of
signals, first a citizens signal with the box-loor closed; second, a patrol signal with
the box-door open; and third, any special signal desired by an officer with the box-
door open, such special signal being determined by the position of the pointer.
To effect this result, a contact pen is normally in contact with the citizens break-
wheel c, and a contact pen is also normally in contact with the patrol break-wheel, c¹,
while the remaining contact pens are disengaged.
The contact pens of the citizens and patrol break-wheels are insulated from each
other, and are connected respectively by branch wires 2, 3, with the main line, but
controlled by the spring-controlled switch A, controlled in turn by the opening and
closing of the door of the box, so that with the box-door closed, the branch 2, is
connected with the main line, as shown in the drawing, to thus transmit the citizens
signal while the branch 3 is cut out and when the box-door is open the branch 3 will
be connected with the main line and branch 2 will be cut out.
At the receiving station a relay R is included in the main line with the battery B,
the armature R of the said relay controlling a local circuit R² including a receiving
instrument, in this instance, shown as an ordinary recorder R³, the relay R being
responsive to the changes of the circuit, the recorder will record all the messages.
A relay T is also included in the main circuit, its armature T¹ being carried by a
lever pivoted at 20 and said lever T has pivoted to its opposite end an engaging
levert which follows upon a loop or guideway, attached to any suitable frame-work,
the said engaging lever being beveled or sharpened at its end to engage the teeth of
the moving wheel t², carried continuously by any suitable motor, or it may, if desired,
be attached to one of the shafts of the recorder R³.

page_text: As the armature T¹ of the relay T is released, the engaging lever is thrown into
the engagement with the toothed-wheel 2, and as the armature is again retracted, the
said engaging lever is withdrawn thus moving back and forth as the condition of the
current is changed.
As it is desirous to sound an audible alarm to give warning upon the reception of
certain signals, as for instance, a citizens signal, or any special signals, and not upon
the reception of the patrol signal, those break-wheels operating to transmit a signal
requiring a warning alarm are cut away or insulated upon their peripheries for a
portion of their length to thus produce a prolonged interruption or change in the
condition of the circuit, which will cause the armature T¹ of the relay T to be retracted
for a longer interval of time to permit the engaging levert to engage the toothed
wheel and be moved upward by the said wheel, until a hooked portion t³ attached
to the said levert, engages a latch or annunciator drop t', releasing the latter, and
closing a local circuit e, containing a vibrator or other suitable bell B thus giving an
audible warning for any signal being transmitted with a prolonged change.
In this instance the signal is transmitted followed by the prolonged change, as will
be seen upon referring to the citizens break-wheel c, and just before the break-wheels
cease to rotate, the circuit is again closed, restoring the same to its normal condition,
at which time the armaturo T is attracted and the engaging lever is withdrawn and
restored to its normal position, leaving the latch to be replaced by the attendant, or
any suitable automatic means may be employed to replace the latch t
To transmit the patrol signal it not being desirable that the audible alarm should be
sounded, the box number is simply transmitted, while the remaining portion of the
wheel is not cut away, so that the engaging lever t is merely vibrated back and forth,
and not retained in engagement with the toothed wheel a sufficient length of time
to be raised to thereby release the annunciator drop.
While I have herein shown the toothed wheel 2 as continuously moved by a motor,
it is obvious that the same may be mounted upon one of the shafts of the recorder,
and thus moved intermittingly.
It is obvious that instead of transmitting the signal followed by a prolonged change
in the condition of the circuit, as herein shewn, the reverse of this operation may be
carried out with the same result.
While I have herein shown a toothed wheel for moving a pivoted lever upward to
effect the operation of an audible alarm it is obvious that other mechanism under the
control of the relay T and capable of being brought into operation upon a prolonged
change of the circuit may be employed without departing from the essence of this
invention.
It is obvious that instead of changing the condition of the circuit by tiotal interrup-
tions as described, any other well known means may be employed without departing
from the invention.
The recorder R³ comprises an actuating magnet a paper strip and motor mechanism
for moving the strip only during the time the message is being received.
The time stamp composed of a dial 30 and indicators hands or pointers 31, carried
by an arbor 32, having its bearings in a bed 33 and a presser 34 and suitable
actuating devices, not shown, for rotating the indicators or hands referred to, said
stamp being placed adjacent to the recorder.
The paper strip upon which the message is recorded is fed between the dial and the
presser.
The presser 34 is secured to an armature bar 35 of an electro-magnet 36, so that
when the said magnet is energized, the presser 34 will be moved.
I have herein shown a magnet for the register as included in an electric circuit R²
containing a battery, said circuit being controlled by the armature of a relay R
included in the main electric circuit containing a battery B.
A relay 10 is also included in the circuit R2, the armature 12 of this relay has a
detent which enters a notch cut in a wheel 13 controlled by a suitable spring, so that
when the armature is retracted, the wheel will be released, and thereby rotated.
A stud 14 projecting laterally from a wheel 13 strikes, during the rotation of

page_text: the wheel, a pen 15, closing a circuit 16 containing a battery 17, thereby causing
the magnet 36 to move the presser against the paper.
The strip of paper is fed forward by the registering apparatus at each time that
the recorder operates to receive a message, and it will be seen that at such time the
time stamp will thus be actuated to print the time upon the paper.
As herein shown the message will be recorded upon one side of the paper, and the
time upon the other side, but while I consider this arrangement most desirable, it is
obvious that the time may be printed upon the same side that the message is
recorded.
By this apparatus a message coming from a distant point may be recorded, together
with the time of its reception, upon a single strip of paper which is moved only at the
time the message is received."
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 :-
1. In a system for transmitting signals from one station to another a transmitting
apparatus constructed and arranged to produce a series of short changes in the con-
dition of the circuit and a prolonged change, also a series of short changes as
described, a relay responsive to such changes in the circuit and a receiving
instrument controlled by such relay, another relay also responsive to such changes in
the circuit and means controlled by the last named relay for effecting the operation of
an audible alarm or warning signal only upon the occurence of the prolonged change,
substantially as described.
2. In a system for transmitting signals from one station to another, a transmitting
apparatus constructed and arranged to transmit a series of total interruptions and a
prolonged interruption, and also a series of total interruptions as described, a relay
responsive to such interruptions of the circuit and a receiving instrument controlled
by said relay, another relay also responsive to such interruptions of the circuit, and
means controlled by the armature of the last named relay for closing a local circuit
containing an audible alarm or warning signal only upon the occurence of the prolonged
interruption, substantially as described.
3. In an electric circuit a transmitting apparatus constructed and arranged to
produce a series of changes of short duration in the condition of the circuit, also a
series of short changes and a prolonged change, combined with a receiving instrument
responsive to such changes in the circuit, and an audible alarm responsive to the
prolonged change only, substantially as described.
4. The method herein described of operating at will either a message receiving
instrument, or a message receiving instrument and an audible alarm or indicating
signal connected with the same circuit, which consists in changing the condition of the
current for a period of short duration to operate the message receiving instrument,
and in changing the condition of the current for a period of long duration to opérate
both the said message receiving instrument and the audible alarm.
5. In an electric circuit connecting two stations, circuit controlling devices at the
transmitting station for changing the condition of the current to produce impulses of
short and long duration at will, combined with the receivers located at the receiving
station, one of which responds to the impulses of short duration, and the other
responds to the impulses of long duration only, substantially as described.
6. In a municipal telegraph system, an electric circuit connecting a main and one
or more sub-stations, and a signal transmitter at each sub-station containing circuit
controlling devices which change the condition of the circuit for intervals of short
duration and long duration at will, combined with a message recording instrument at
the main station which receives the signals transmitted, and an audible alarm also
located at the main station responsive only to the long changes produced by the
circuit controlling devices at the sub-stations, whereby a warning signal may be
sounded for some and not for other signals at the will of the operator, as set forth.
7. In a message and time recorder, the registering mechanism, and paper moving
nechanism adapted to movo the paper only during the time the message is being

page_text: received, combined with a time stamp automatically actuated at each time a message
is received to thereby print the time upon the paper, substantially as described.
8. In a message and time recorder, the registering mechanism, and paper moving
mechanism, combined with a time stamp and electro-magnet for actuating it to print
the paper, a circuit changer 12, 13, and the relay 10 all substantially as described.
9. A signal box containing a transmitting apparatus constructed and arranged to
transmit an unimportant signal, as the box-number, and an important signal as one
of a series of special signals in conjunction with the box number, a door closing the
box and means conccaled by the door for actuating the transmitter to transmit signals
of either kind, combined with recording apparatus at the central station for recording
the different signals transmitted, and an alarm or indicating mechanism for
distinguishing the important from the unimportant, recorded messages, substantially
as described.
10. A signal box containing a transmitting apparatus constructed and arranged to
transmit an unimportant signal, as the box number, and an important signal as one of
a series of special signals in conjunction with the box number, a door closing the box
and means concealed by the door for actuating the transmitter to transmit signals of
either kind, and means accessible from the exterior of the box for actuating the
transmitter to transmit one signal only, combined with recording apparatus at the
central station for recording the different signals transmitted, and an alarm or
indicating mechanism for distinguishing the important from the unimportant recorded
messages, substantially as described.
11. A municipal telegraph system, wherein are combined a transmitting station
and a receiving station connected by an electric circuit, a multiple transmitting
apparatus located at the transmitting station and constructed and arranged to transmit
important and unimportant signals, a receiving instrument located at the receiving
station responsive to the different signals and an audible alarm or heralding signal
arranged to respond to important signals only, substantially as described.
12. In an electric circuit transmitting mechanism operative to transmit different
signals, combined with receiving mechanism for receiving the signals, and an audible
alarm responsive to the reception of some of the signals and not others, substantially
as described.