Improvements in and relating to Electric Signalling Apparatus, Chiefly Designed for use in Hotels and other Buildings.
Year: 1889

page_text: Date of Application, 12th Nov., 1839-Accepted, 14th Dec., 1889
COMPLETE SPECIFICATION.
[Communicated from abroad by EDWARD MORGAN, of 546, Cherel Street, New Haven,
County of New Haven, Connecticut, United States of America, Manufacturer.]
Improvements in and relating to Electric Signalling Apparatus,
Chiefly Designed for use in Hotels and other Buildings.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co. Patent Agents,
Southhampton Buildings, in the County of Middlesex, 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:-
My invention relates to the class of apparatus employed for causing the various
wants, which may require attention at different more or less remote points to be
indicated at a central station, such for instance as a hotel office, from which the wants
are to be served.
The object of the invention is to provide reliable, simple and efficient means for
transmitting the required signals to the central office, insuring that the signals shall be
received in their proper order, and that one signal or call shall be attended to before
another is received.
In carrying out the invention there is placed at each of the signalling points, the
rooms of a hotel for instance, a transmitter capable of being placed in any of a
number of different positions to indicate the wants. Conductors lead from the
several transmitters to corresponding contact-plates at the office, and over these a
contact-arm is caused to pass in succession. The contact-arm is connected with one
pole of a battery, the other pole of which is connected with all the transmitting
devices either directly or through the earth. The battery is connected with each of
the contact-plates once during each revolution of the contact-arm but the circuit is
not completed through the corresponding transmitter except when the transmitter
has been set for a given signal. In other words each circuit is normally open at two
points one of which is closed by the act of setting the transmitter and the other by
the circuit-closing arm at the office coming into contact with the corresponding
contact-plate.
When any circuit has thus been completed a locking device is automatically released
at the office which stops the circuit closing arm while still in contact with the plate
and at the same time the transmitter commences to operate. This operates to
interrupt and completo the circuit a number of times dependent upon the signal
to be given and returns to its point of rest again interrupting the circuit.
An indicator arm moving with the contact-arm serves to point out upon a dial
the number of the room from which the signal is sent, and a second indicator is
operated by the impulses and is moved over a
want dial" step-by-step thereby.
The room indicator and the want indicator remain at the points in which they have
been thus automatically placed until the attendant, by pressing a button, or in other
convenient manner, releases the circuit-closing arm and at the same time allows the
want indicator to return to its starting or zero point.
There are various modifications which may be made in the organization of
the apparatus adopted in carrying out the invention without departing from the
general principles.
In the accompanying drawings illustrating this portion of my invention, Figure 1
is a front view partly in section, of the receiving instrument or indicator and of the
transmitter, showing also, in diagram, the circuit connections. Figure 2 is a side
view of the receiver, also partly in section. Figure 3 illustrates certain details in the
construction of the latter. Figure 4 is a side view of the transmitter. Figure 5 is
a diagram illustrating a modification in the organization of circuits.

page_text: Referring to the figures, a description will first be given of the transmitters, all of
which are alike, and one of which is to be placed in each room, for instance, of a hotel.
A represents the front of a suitable containing box upon which the different calls or
wants are printed. A circuit-controlling wheel a upon an arbor a¹ is designed to be
turned in the direction of the arrow by an arm or crank a, and at the same time wind
a spring a. The wheel is locked in whatever position it is placed by the armature
lever 6 of an electro magnet B, intercepting the path of an escapement anchor b¹.
The anchor is applied to a scape-wheel which is geared with a toothed wheel ³ upon
the arbor a and with said arbor through a ratchet and pawl. These permit the
crank to be turned forward to set the transmitter but prevent it from returning until
the anchor is released. This is accomplished by vitalizing the electro-magnet at the
proper time and thereby withdrawing the lever from the path of the anchor. The
circuit-controlling or break wheel a then moves gradually back to its starting point
under the influence of the spring, its movement. being retarded as desired. The break-
wheel is constructed with circuit-closing points a which successively make contact
with the contact-brush a. When the wheel is at its point of rest an insulating point
or a space between the teeth or projections is beneath the brush so that circuit-
connections are not then established.
The crank itself points out the wants which will be signalled when it is placed in
any position. The projections of the break-wheel are preferably so related that for
each contact made with the brush, the crank will move across one of the wants
indicated upon the dial. The return of the crank to its starting point is in itself an
indication to the person calling that his call is being received, for the transmitter
remains locked until the receiving device releases it, and this is done automatically
without further intervention of the caller or of the clerk, as will hereinafter
appear.
Referring now to the receiving apparatus, it may be premised that the usual
annunciator drops and the electro-magnets required in connection therewith are
entirely dispensed with and but one electro-magnet H is employed for causing the
room and the want to be indicated, and that no attention is required at the office other
than the releasing of the apparatus after a want has been indicated. A dial d is
provided with a series of numbers d', representing the rooms containing the different
transmitters. A hand or room indicator D, upon a sleeve or quill is driven over
these numbers continuously by a suitable motor E which may be either mechanical,
electric or hydraulic. The sleeve d also carries a circuit-closing arm F which moves
over a series of contact-plates f, one plate being provided for each room indicated
upon the dial and being connected, by a corresponding conductor 1, 2 or 3 etc. with
the break wheel through the corresponding electro-magnet B., The arm F is
connected by a conductor through electro-magnet H with one pole of a battery O.
The other pole of this battery is connected through a conductor g³, with all the
contact-brushes a³ of the transmitters.
The electro-magnet His provided with an armature lever / carrying a pin ². This
pin normally enters a hole in a collar surrounding a stationary sleeve or shaft
concentric with the sleeve d², and extends into a corresponding opening in the sleeve h³
thus locking the collar, which is capable of sliding upon the shaft against the tension
of a spring. A ring k, carrying a series of pins ¹ equal in number to the rooms
upon the dial, is supported from the collar and these are held out of the path of the
circuit-closing arm so long as the collar is locked. When the electro-magnet H is
vitalized, the collar is forced forward by the spring and one of the pins immediately
intercepts the path of the arm, thus arresting and locking it. The electro-magnet H
is thus vitalized when the arm F comes in contact with any plate connected with the
transmitting instrument which has been set to send a signal. The electro-magnet is
made to respond quickly and so lock the arm while it is still in contact with the same
plate. The room-indicator hand D is thus brought to rest opposite the number
designating the room in which the transmitter is located.
The current through the circuit thus completed also causes the electro-magnet B to

page_text: be vitalized and to release the break-wheel. This electro-magnet way with advantage
be constructed to respond somewhat more slowly than the magnet H, though this is
not necessary. The movement of the break-wheel immediately causes the circuit to
be alternately broken and completed a number of times dependent upon the position
in which the crank a has been placed. The armature of the electro-magnet H is thos
actuated and this serves to actuate a want indicator M extending over a dial i step-
by-step, causing it to pass over as many of a series of wants m² indicated thereon as is
passed by the crank during its return to the zero point.
The armature-lever h carries a driving pawl m³ which engages the teeth of a
wheel m³ and advances it step-by-step. This wheel is mounted upon an arbor or
post m* which extends through the quill or sleeve d² and carries the want indicator M.
The want indicator is thus moved independently of the room indicator D, and the
latter remains at rest. The wants are arranged in a series corresponding to those
upon the transmitters and it is evident that in whatever position the transmitter-crank
is placed the indicator M will be caused to stand in a corresponding position when the
crank has returned to its zero point.
For the purpose of calling the attention of the attendant at the office when a call
is sent a vibrating bell N included in the circuit of a local battery o, is provided. It
is designed that the circuit of this battery shall be completed just after the indicator M
commences to move. In the drawing the terminals of the circuit are represented as
being in two contact plates n' and n². Upon the arbor m is carried a contact-brush n³
which is adapted to make contact with the two points n¹ and n², when the arbor has
been moved by the first movement of the armature lever h. The bell therefore rings
until the next movement of the arbor, whereupon the brush n³ is carried out of
contact with the points. Other methods of operating the same are obvious.
It may be found desirable to employ the first space upon the want dials for
signalling a fire-alarm and this organization is especially well adapted to, such an
arrangement, as the alarm bell will continue to ring so long as the want indicator
stands at this point.
The means whereby the indicator D is released and the indicator M returned to its
zero point are as follows: One end of a spring p is attached to: he arbor m' and the
other to a stationary support. This spring is wound by the forward movement of the
crank and tends to return it to its starting point. A dog p² secured to the frame
prevents the spring from returning the wheel until both the dog and the pawl are
thrown out of engagement. This is done when the locking pin his returned into the
opening through the shaft ³, for the reason that the further movement of the
armature lever h away from the electro-magnet which is then allowed causes the pawl
to draw across a pin q' secured to the frame while a pin or arm q' carried upon the
armature lever serves to release the dog throwing it out of engagement with the
wheel.
All that is required to release the arm F and lock the collar is to force the latter
back against the tension of the spring h*. An arm R pivoted at one end to a
stationary support is forked at the other end and embraces or is pivoted to the
collar An arm extends through the face of the dial or to some other convenient
point where it may be pressed inward thus forcing back the collar until the locking
pin enters the openings and the circuit-closing arm F is released. The latter,
together with the indicator D is immediately moved forward by the motor while the
arm M springs back to its zero point.
As the electro-magnet B might release its armature and lock the escapement anchor
upon the first interruption of the circuit by the break-wheel, it may be constructed to
demagnetize so slowly that the armature will not fall away between the successive
impulses, or a locking spring s may be provided for holding it when once drawn
forward until it is released by the return of the break-wheel to its starting point.
This is readily accomplished by constructing the spring to press against the armature
lever and providing a catch which projects over it when the lever is drawn to its
magnet. An extension of the spring passes beneath the break-wheel and when the

page_text: latter reaches its starting point a cam or projections upon its face presses the spring
back and removes the catch from the path of the lever which again locks the
anchor.
In Figure 5 a system of circuits is illustrated by means of which the want indicator
is operated by a separate magnet H¹ included in a circuit which is independent of the
circuit including the releasing magnets B and H. In this system a conductor 4 leads
from the releasing magnet to the earth at G¹ and a conductor 5 leads from the other
terminal of the magnet coils to an insulated contact-point u. An insulated spring u²
is held away from this point while the transmitter is at its zero point by an arm u
upon the arbor of the break-wheel. When the crank is moved forward the spring u³
is allowed to rest against the point u¹. The spring is connected by a conductor G
with the contact point of the series d corresponding to the transmitter. The contact
arm F is connected by a conductor 7-through the coils of the electro-magnet H with
one pole of the battery O¹ the other pole of which is connected with the earth at G³
by a conductor 8. It will be evident thus that a circuit will be completed for the
battery O¹ through the magnets B and H, when a transmitter has been set and the
contact arin F strikes the corresponding plate. The ratchet wheel and want-indicator
are not actuated by the lever of the magnet H in this instance but by an electro
magnet H included in the circuit of the battery O. One pole of this battery is
connected with the earth at G3 by a conductor g³. The other pole is connected by a
conductor g through the coil of the magnet H with the several lines leading to the
different rooms. These conductors are connected with contact-brushes a applied to
the respective break-wheels. The break-wheel a is connected by a conductor g
with a contact-point applied to the armature lever connected with the earth
at G by the conductor g. When the releasing magnet B is vitalized the circuit of
the battery will be completed through the corresponding transmitter and the
impulses will be sent for actuating the want-indicator. The circuit of the magnet B
will remain complete until the transmitter has returned to its zero point and
therefore the arunature lever 6 will be held in its forward position independent of
the spring catch employed in the former instance. The driving pawl m³ for the
wheel m³, it will be understood, is carried upon the lever of the electric magnet H¹.
The pawl and dog are thrown out of engagement with the wheel by an arm q carried
by the lever in the manner described with reference to the Figures 1, 2 and 3.
The second portion of my invention relates to an improvement in variable signal
transmitters for that class of indicating or annunciating apparatus, such as described
above, in which a series of such transmitters located at substations are combined
with a receiver located at a receiving-station and provided with a transmitter
indicator to locate the respective transmitters and a signal indicator to reproduce the
signals therefor and the object of this portion of the present invention being to
produce a transmitter having convenient mechanism for breaking the circuit
through it while it is being set and for protecting it from being accidentally
operated.
With these ends in view this portion of my invention consists in a transmitter
having certain details of construction and combinations of parts as will be herein-
after described and pointed out in the claims.
In the drawings illustrating this portion of my invention Figure 6 is a view in
front elevation of one form which a transmitter embodying my invention may
assume; Figure 7 is a view with the ring and hasp removed; Figure 8 is a
sectional view of the device on the line a-6 of Figure 6; Figure 9 is a sectional
view of the device on the line c-d of Figure 7; Figure 10 is a view in front
elevation of such a receiver as transmitters made in accordance with my invention
may be combined with; and Figure 11 is a view in the nature of a diagram and
showing the contact-buttons, the contact-ring and the circuit-closer of the said
receiver, the hasp-connections of a transmitter, the main-line wire between the
transmitter and the receiver and the battery in such line.
As herein shown, the transmitter is provided with a pointer A³ forming the indicator

page_text: of the device, a metallic disc B³ having a small rubber block C³ set into its periphery
and forming the circuit-controller of the instrument, a magnet D³ which restores the
pointer to its position of rest and operates the circuit-controller to break the circuit,
and a circuit-interrupter constituting this portion of my present invention and here
taking the form of a hasp E. The said pointer A2 is arranged to be swept over a
dial having a circular series of signals or wants printed upon it, and is rigidly
secured to an arbor G mounted in frame-plates H2, H2 and projecting centrally
through the dial and through a glass I covering the same, the projecting end of the
arbor being provided with a knurled thumb-nut J for rotating the arbor to set
the pointer which is located between the dial and glass. The circuit-controller is
also imounted upon the said arbor in position to break the circuit when the pointer is
in its zero position or when it points to a star on the dial. The said magnet D³
operates to restore the pointer to its position of rest and to actuate the circuit-
controller to break the circuit, through a star-wheel K2 rigidly secured to the arbor,
having the same number of teeth that the dial has signals or wants and actuated by
an anchor-shaped pallet L' carrying an armature M. arranged to be attracted and
released by the magnet one end of the coil whereof is connected with a conductor N'
branched to lead to two contact-fingers 02, 02 secured to a rubber block P² and so
insulated from the instrument and engaging with the periphery of the circuit-
controller disc B' before mentioned. The other end of the magnet coil is connected
by a conductor Q² with a main-line wire R2 which includes all of the transmitters in
the series, a battery S2 and a receiver one form of which is shown by Figure 10 of
the drawings. From the said fingers the current flows through the disc B² to the
arbor G thence through the plates H2, H2 to the back T of the instrument, thence
to the ring U thereof and thence to the circuit-interrupting hasp E' which is hinged
to a strap or reinforce V2 attached to the ring.
The said hasp E³, as hereinshown, is made from sheet-metal having midway of its
ends an enlargement W2 which is struck up to form a boss X³ to close around and
yet clear the knurled thumb-nut J2 which it guards. The opposite end of the hasp
is provided with an operating-button Y2 by which it is opened and closed and with à
contact-finger forming a part of a wire A³ employed for stiffening the hasp
throughout its length. When the hasp is closed the said finger engages with a
contact spring B³ insulated from the instrument In a recessed rubber block (3 secured
to the ring and connected with a binding-post D³ also mounted in the said recessed
block and receiving a special wire E leading from the transmitter to the receiver.
It will be seen that under the construction described, the circuit through the
main-line and including the battery the receiver and the transmitter is closed through
to the disc B² and the fingers 02, 02 when the hasp is closed and loops the trans-
mitter-frame and hence the dist B into the circuit. It will be equally clear that
when the hasp is open and the connection between its finger and the spring B³ is
broken, the transmitter will be cut out of circuit-connection with the battery and
receiver and that the circuit-controller and hence the pointer may be freely moved
without closing a circuit through the receiver. But as soon as the hasp is closed
again, the transmitter will be cut into the circuit. The hasp, therefore forms a
circuit-interrupter whereby the transmitter may be cut out of the main-circuit and
into the same at pleasure, so that the required time for setting the transmitter may
be taken without any reference to the receiver. The hasp has also the important
function of preventing access to the thumb-nut when the instrument is in the circuit
and thus avoiding the confusion which might result on account of a guest changing
his mind after once setting the pointer which he cannot reach without opening the
hasp and cutting the instrument out of circuit. The hasp also prevents the thumb-
nut from being accidentally moved when the device is not in use.
The receiver, as shown by Figure 10 of the drawings is provided with a case F³, a
dial G, a pointer H³ forming a transmitter-indicator, a pointer 13 forming a signal-
indicator and a resetting-manual J, the pointer H being attached to a spindle K and
the pointer I being shonred to a sleeve L³ mounted upon the said spindle which is

page_text: rotated by a train (not shown) while the said sleeve is rotated by an independent train
(not shown) automatically released by the closing of a circuit through the receiver
and one of the transmitters. The said dial G is provided with a circular series of
numbers specified by the pointer H3 and each indicating a transmitter and with a
similar series of signals located within the number series, specified by the short
pointer 13 and corresponding to the signals or wants on the transmitter dials except in
being reversely arranged.
The necessity of providing for time for setting the transmitters may be shown in
connection with Figure 11 of the drawings which shows a part of the mechanism
located within the case F. The contact buttons M³, arranged in a circular series,
respectively constitute the special-wire and therefore the receiver terminals of the
several transmitters. A circuit-closer N³ and a brush O both mounted on an insulated
rotatable arm P³ acting in unison with the pointer H³, sweeps over the said terminals
and a ring which is located in the main circuit. The closing of a circuit in one
of the transmitters at once closes the main circuit through to the particular button
forming the receiver terminal of the transmitter calling and starts the circuit-closer in
search of that button. As soon as the button is found the connections of the main
circuit are completed and the circuit closer is stopped and locked with the
pointer H (connected with it) standing over the number on the dial G representing
the transmitter calling. Now as soon as the circuit-closer stops the receiver operates
to reproduce the signal over which the indicator of the transmitter stood when the
main-circuit was closed through the said button and circuit-closer. But the closing
of this circuit may take place almost at once after the circuit has been closed in
the transmitter and even before time has been given to sweep the transmitter-
indicator over the dial to the signal theroon which it is desired to reproduce in the
receiver. Suppose, for instance, that the receiver has been reset to leave the circuit-
closer in the position in which it is shown in the drawings and that the next
transmitter operated is connected with the contact-button which the next button to
be engaged by the circuit closer in its rotation in the direction of the arrow. In such
case the circuit-closer would be started and stopped and the receiver started to
reproduce a signal before the indicator in the transmitter could be moved further than
one or two points from its zero position and before the guest could place it rightly.
It becomes necessary then, to provide time in which to set the transmitter and I have
provided for this time by a circuit-interrupter forming a part of and attached to the
transmitter and cutting the same in and out of the main-circuit as it is operated.
I do not confine myself to the particular form of circuit-interrupter shown and
described or to using my invention with the form of receiving apparatus illustrated.
I would therefore have it understood that I do not limit myself to the exact
construction shown and described but hold myself at liberty to make such changes and
alterations as fairly fall within the spirit and scope of my invention.
Having now particularly described and ascertained the nature of the said invention
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 ;-
1st. In an electric indicator, the combination with a series of variable signal-
transmitters each having a magnet, of a circuit-closer located at a receiving-station, a
series of terminals also located at the said station, respectively connected with the
said transmitters and all normally in the path of the circuit-closer, and circuit
connections comprising a circuit-closer at each transmitter operated by setting the
same and a line extending therefrom through an appropriate terminal of the receiver
and its circuit-closer, the transmitter calling being set in operation by its magnet when
the circuit is so closed, substantially as set forth.
2nd. The combination, substantially as herein before set forth, of one or more circuit-
controlling transmitters each capable of being set in position to make and break the
connections of an electric circuit; a contact-plate at a central station corresponding
to each transmitter, and electrically connected therewith, a contact-arm adapted to

page_text: periodically make contact with each plate, means for causing any transmitter which
has been set to be automatically actuated when the contact-arm touches the corre-
sponding plate, and an indicator also located at the central station and actuated by the
operation of the transmitter.
3rd. The combination, substantially as herein before set forth, of a series of circuit
making and breaking transmitters located at different points, a contact-plate corre-
sponding to each transmitter und electrically connected therewith, a contact-arm
adapted to be placed in contact with the respective contact-plates one at a time means
for causing the same to be held in contact with any plate connected with a
transmitter which has been placed in position to transmit a signal, a dial, an
indicator moving with the contact-arm and indicating at any time upon said dial the
particular transmitter which has so caused the arrest of the contact-arm, a second
indicator and means for actuating the same by the operation of said transmitter, said
contact-plates, contact-arm, dial and indicator being at a central station and all of the
said contact-plates being in the path of the contact-arm.
4th. The combination, substantially as hereinbefore set forth, of a battery, a series
of circuit making and breaking transmitters located at different points, a series of
contacts one for and connected with each transmitter, a continuously moving contact-
arm applied to said contacts and connected with said battery, means for setting any or
all of said transmitters in position to complete the connections of an electric circuit
from said battery to the corresponding contact and locking it in such position an
electro magnet vitalized by the contact of said arm with said contact to release said
transmitter, means for returning the transmitter to its normal position when so
released and for causing it to make and break the circuit of said battery a number
times dependent upon the position in which it has been set, an indicator and means
controlled by the impulses thus occasioned for moving said indicator, said contacts,
contact-arm and indicator being located at a central station.
5th. The combination, substantially as herein before set forth, of two dials located
at a central station, one containing room designating characters and the other want
designations, two revolving indicators respectively applied thereto, means for causing
the room indicator to normally move continuously above its dial, a series of call boxes
or transmitters located in different rooms, means controlled by the respective boxes
for arresting the room indicator in position to indicate the number of the room
containing it, and means operated by the transmitter which has so caused the arrest
of the room-indicator for actuating the want-indicator and causing it to stand in any
required position.
6th. A hotel annunciator system consisting of a series of contact-plates located at a
central office, a revolving circuit-closing arm applied thereto, a room-indicator moving
therewith, a locking device for arresting said arm and indicator in any required
position, an electro-magnet for causing said locking device to operate, a series of
call-boxes located at different points each capable of being set to transmit a variable
number of impulses dependent upon the want to be answered and locked in such
position, a circuit closed by the combined action of a box so set and said circuit-closing-
arm, through said electro-magnet thereby causing said indicator to stop in position to
designate the box combining therewith to so complete the circuit, means for releasing
said box automatically, a want indicator advanced step by step by the impulse
occasioned by the call-box and serving to point out the want required.
7th. In a hotel annunciator system, a revolving room-indicator, a want-indicator,
corresponding concentric dials, a circuit-closing-arm moving with the room-indicator,
a series of contact-plates, conductors leading therefrom to the respective rooms, a
locking device for arresting said arm in contact with any contact-plate, an electro-
magnet its armature-lever normally restraining said locking device, a ratchet-wheel
and pawl for advancing said want indicator actuated by the movements of said lever,
a spring wound by the advancement of said want-indicator, means for releasing said
contact-arm and throwing said pawl out of engagement with said ratchet-wheel thereby
permitting the room-indicator to advance and the want-indicator to return to its
starting-point.

page_text: 8th. The combination, substantially as herein before set forth, in a hotel annunciator
and call system of a room-indicator, a want-indicator and concentric dials for the
same located at the central office, a series of call boxes located in the respective
rooms, means controlled by any call-box for arresting the room-indicator in position
to indicate the room containing the same, means for advancing the want indicator
while the room indicator is so arrested, and manually operated mechanism for releasing
said room-indicator after the signal has been received and causing the want-indicator
to return to its point of rest.
9th. The combination with a series of variable signal transmitters each having an
indicator, a magnet and a motor released by the magnet to restore the indicator to
its zero position; of a circuit-closer located at a receiving station, a series of terminals
all normally located in the path of the said circuit-closer and respectively connected
with the said transmitters, a locating indicator also located at the receiving-station
and adapted to locate the transmitters, an automatically started signal-indicator to
reproduce the transmitter signals, and circuit-connections between the transmitters
and the said receiving-station, whereby the indicators at such station are controlled,
substantially as set forth.
forth.
10th. The combination with a series of variable signal transmitters each having an
indicator, a magnet and a motor released by the magnet to restore the indicator to its
zero position; of a locating indicator located at a receiving-station and adapted to
locate the transmitters, an automatically started signal-indicator to reproduce the
signals to which the transmitters may be set, circuit connections between the
transmitters and the receiving-station, and a rheotome located in such circuit which
it interrupts to control the action of the said signal-indicator, substantially as set
11th. The combination with a series of variable signal-transmitters each having an
indicator, a circuit-controllor, a magnet and a motor released by the magnet to
operate the said indicator and circuit-controller in being restored to their normal
positions ; of a locating indicator located at a receiving-station to locate the said
transmitters, an automatically started signal-indicator to reproduce the signals to
which the transmitters may be set, circuit connections between the transmitters and
the receiving-station, and a rheotome for interrupting the circuit, whereby the circuit-
controllers of the transmitters are called in by the magnets thereof to break the
circuit and thus control the signal-indicator, substantially as set forth.
12th. The combination with a series of variable signal-transmitters each having an
indicator, a magnet and a circuit-controller, of a series of terminals located at a
receiving-station and respectively connected with the said transmitters, a circuit-
closer adapted to successively make contact with the terminals, a locating-indicator
connected with the circuit-closer to locate the transmitters a magnet-released detent
to arrest the circuit-closer and hence stop the indicator, a signal-indicator to reproduce
the signals of the transmitters, a magnet-released detent to automatically release the
signal-indicator when the locating indicator has given its indication, and circuit
connections between the transmitters and the magnets of the said detents, substantially
as set forth.
13th. The combination with a series of variable signal-transmitters each having
an indicator, a magnet and a circuit-controller, of a series of terminals located at a
receiving-station and respectively connected with the said transmitters, a circuit-closer
adapted to successively make contact with the said terminals, a locating-indicator to
locate the transmitters, an automatically released signal-indicator to reproduce the
signals of the transmitters, circuit-connections between the transmitters and the
receiving-station and a rheotome to interrupt the circuit, whereby the circuit-
controller of the transmitter calling is called in to break the circuit and the signal-
indicator controlled, substantially as set forth.
14th. The combination with a series of variable signal-transmitters, of a series of
terminals located at a receiving-station and respectively connected with the trans-
mitters, a circuit-closer to successively make contact with the terminals which are
all normally in the path thereof, a locating-indicator connected with the circuit-closer

page_text: and locating the transmitters, and automatically released signal-reproducing mechanism
to reproduce the signals of the transmitters, substantially as set forth.
15th. The combination with a series of variable signal-transmitters each having an
indicator, a magnet and a circuit-controller, of a series of terminals located at a
receiving-station and respectively connected with the transmitters, a circuit-closer to
successively make contact with the terminals. a locating-indicator to locate the
transmitters, an automatically released signal-repro lucing mechanism to ropro-luce
the signals of the transmitters, circuit connections between the transmitters and
receiving-station, and a rheotome to interrupt the circuit and call in the circuit-
controller of the transmitter calling to change the circuit to its normal condition,
after the ocating indicator and signal-reproducing mechanism have been operated,
substantially as set forth.
16th. In an electric indicator, the combination with a series of variable signal-
transmitters, of a circuit closer switch located at a receiving station, a series of
terminals all normally located in the path of the said circuit-closer and respectively
connected with the said transmitters, a locating-indicator to locate the several
transmitters, a lock to stop and hold the same, an electro-magnet to operate the said
lock, and a signal-indicator to reproduce the signals of the transmitters having a
controlling magnet in the circuit closed by the circuit-closer switch through one of
the terminals, substantially as set forth.
17th. In an electric indicator, the combination with a series of variable signal-
transmitters each having an indicator, a circuit-controller and a magnet for operating
the same; of a rotatable circuit-closer switch located at a receiving-station, a series
of circularly disposed terminals all normally located in the path of the said circuit-
closer switch and respectively connected with the said transmitters, a locating-indicator
to locate the several transmitters, coupled with the said switch and travelling there-
with; a lock to stop the said indicator and switch when the latter has closed a circuit.
through any one of the terminals, an electro-magnet to operate the said lock and
vitalized by the circuit thus completed, and a signal-indicator having a controlling-
magnet in the circuit closed by the said switch as described, substantially as set
forth.
18th. A variable signal transmitter having a dial, an indicator, a magnet, a circuit-
controller, and a circuit-interrupter hinged to the instrument so as to be swung over
and away from the dial and cutting the said circuit-controller into and out of an
electric circuit, substantially as set forth.
19th. A variable signal-transmitter having a dial, an indicator, a magnet, a circuit-
controller, an insulated contact-finger located at one side of the said dial, and a
circuit-interrupter hinged on the other side of the dial from the said finger with
which it is engaged and disengaged to cut the circuit-controller into and out of an
electric circuit, the said circuit-interrupter swinging over and away from the dial,
substantially as set forth.
20th. A variable signal-transmitter having an indicator, a magnet, a circuit-
controller, and a hinged circuit-interrupter forming a part of the instrument, cutting
the same into and out of an electric circuit and constituting a guard for the indicator,
substantially as set forth.
21st. A variable signal-transmitter having an indicator, an arbor on which the
same is mounted, an exposed thumb-nut secured to the arbor for use in operating the
indicator, a magnet, a circuit-controller, a hasp hinged to the instrument and adapted
to fit over the nut and form a guard for it, and a contact-finger insulated from the
instrument and engaged by the finger for cutting the instrument into and out of an
electric circuit, substantially as set forth.
22nd. The combination with a signal transmitter having a signal-indicator, a
circuit-controller, a magnet for operating the said indicator and controller, and a
circuit-interrupter for cutting the transmitter into and out of an electric circuit; of
B

page_text: a receiver having a transmitter-indicator to specify the transmitter and a signal-
indicator to reproduce the signals thereof, the said circuit interrupter being hinged to
the transmitter and forming a guard for the indicator thereof, substantially as set
forth.
Dated this 12th day of November 1889.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.