Improvements in and relating to Telephonic and Telegraphic Call Apparatus.
Year: 1887

page_text: Date of Application, 29th Mar., 1887
Complete Left, 29th Dec., 1887
Complete Accepted, 9th Mar., 1888
PROVISIONAL SPECIFICATION.
Improvements in and relating to Telephonic and Telegraphic Call
Apparatus.
We CHARLES LAURENCE BAKER of the Cornbrook Telegraph Works Manchester
and FRANK BRYAN of 4 Levenshulme Terrace Levenshulme both in the County of
Lancaster Electrical Engineers, do hereby declare the nature of this invention to be
as follows:
This Invention relates to telephonic or telegraphic call apparatus and has for its
objects to enable the operator at the central station or exchange to signal or ring up
any one of a number of separate stations on a single line or circuit without disturbing
or signalling any intermediate or other station on the same line; to prevent any
subscriber or other person using any instrument or apparatus at any station on the
line or circuit overhearing or otherwise ascertaining the nature of or interfering with
any communication to or from any other station on the same line or circuit; to enable
any two stations on the same line or circuit to be placed in communication with each
other while at the same time the other stations are cut out or disconnected, and to
provide a self winding arrangement by means of which the instrument at each station
is wound up every time it is used.
These Improvements consist in the construction arrangement combination and
adaptation of devices and apparatus constituting parts of a telegraphic or telephonic
"Individual Call" system. At each station I employ a clock work device actuating
a locking wheel and cams the clock work of the instruments or apparatus upon the
same line or circuit being so proportioned or constructed relatively to each other as to
be isochronous and to stop at a zero or normal position after each revolution of the
locking wheel. The clockwork is released by the action of a centrally pivoted lever
one end of which carries an electro or permanent magnet so constructed and arranged
as to be capable of motion between the poles of a permanent or electro magnet or
relatively to coils or helices, or by the action of an ordinary polarized relay, so that
upon the passage of a current of electricity in one direction the lever and electro-
magnet thereon are moved in one direction and upon the passage of an opposite

page_text: current they are moved in the opposite direction. At or upon the other end of the
lever are fixed or arranged pawls or detents which engage with teeth and with a pin
formed upon or secured to the locking wheel. This arrangement enables the clock-
work at each station on the same line to be simultaneously released or locked as
required. Upon the spindle of the locking wheel or otherwise in a similar relation to
the locking wheel there is fixed a cam upon which rests a spring. This spring is so
constructed and arranged that when the locking wheel, and therefore the cam, is in a
proper position contact is male or broken in a local circuit including a bell or
instrument. The movement of the spring is further controlled by a projection carried
or actuated by the lever so that unless the lever is caused to fall into its proper
position the spring remains in its normal position and the local instrument or
apparatus is not put in circuit.
An index or pointer may be fixed upon or attached to the arbor of the locking
wheel so as to indicate upon a dial whether or not the line is in use from any other
station.
The hereinbefore mentioned cams in or operated by the clockwork at each station
are respectively and relatively constructed arranged or disposed to come successively
into the position required to enable the springs resting thereon to make or break
contact in the local circuits.
The ringing up and similar local arrangements are so disposed and constructed that
a subscriber or other person at any of the stations may, when the instruments are in
their normal position, ring up or signal the exchange or central station by pressing a
key but when the line has been put in use by the movement of the locking wheel of
each instrument from the zero position, no subscriber or person other than the one
who is in possession of the line can signal, listen or in any way ascertain or interfere
with any message or communication to or from any other station or stations because
their instruments are for the time cut out of the line or circuit.
The construction and arrangement of the apparatus permits each station to be
placed in communication with the exchange or centre and further allows any station
to be placed in communication with any other station on the same line or circuit.
A self winding arrangement may be adopted or the clockwork may be actuated or
driven by springs or weights. A convenient form of self winding arrangement may
be constructed by attaching to the arbor of a suitable wheel of the clock work a cross
arm or lever one end of which is weighted while the opposite end on the other side of
the arbor is capable of being attracted or moved by an electro magnet. This arrange-
ment enables the weighted end of the lever to be lifted on the passage of a current
through the coils of the electro-magnet. A ratchet wheel may be attached to the arbor
carrying the weighted lever in proximity to one of the wheels of the clock work which
is free to revolve on the same arbor but is intermittently rotated in one direction
therewith by means of a pawl or detent which may be pivoted or pinned upon the
wheel and engage with the ratchet in such a manner that when the weighted lever is
released and the weighted end consequently falls the clockwork is actuated. By this
arrangement each instrument or apparatus is wound up or the weight for driving it is
raised overy time it is used and the necessity for external aid in winding is avoided.
Alternatively, the winding may be effected by means of a small electro-motor in a local
battery circuit which may be closed periodically from the exchange or central
station.
1
1
n
WILLIAM E. HEYS,
Agent for the Applicants.

page_text: Improvements in and relating to Telephonic and Telegraphic Call
Apparatus.
We, CHARLES LAURENCE BAKER of the Cornbrook Telegraph Works Manchester
and FRANK BRYAN of 4 Levenshulme Terrace Lovenshulme both in the County or
Lancaster Electrical Engineers, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This Invention relates to telephonic or telegraphic call apparatus and has for its
objects to enable the operator at the central station or exchange to signal or ring up
any one of a number of separate stations on a single line or circuit without disturbing
or signalling any intermediate or other station on the same line; to prevent any
subscriber or other person using any instrument or apparatus at any station on the line
or circuit overhearing or otherwise ascertaining the nature of or interfering with any
communication to or from any other station on the same line or circuit; to enable any
two stations on the same line or circuit to be placed in communication with each other
while at the same time the other stations are cut out or disconnected and to provide a
self winding arrangement by means of which the instrument at each station is auto-
matically wound up periodically.
These Improvements consist in the construction arrangement combination and
adaptation of devices and apparatus constituting paris of a telegraphic or telephonic
"Individual Call" system. At each station we employ a clockwork device actuating
a locking wheel and cams the clock work of the instruments or apparatus upon the
same line or circuit being so proportioned or constructed relatively to each other as to be
isochronous and to stop at a zero or normal position after each revolution of the locking
wheel. The clockwork is released by the action of a centrally pivoted lever one end
of which carries an electro or permanent magnet so constructed and arranged as to be
capable of motion between the poles of a permanent or electro magnet or relatively to
coils or helices or by the action of an ordinary polarized relay, so that upon the passage
of a current of electricity in one direction, the lever and olectro magnet thereon are
moved in one direction and upon the passage of an opposite current they are moved
in the opposite direction. At or upon the other end of the lever or of an auxiliary
lever receiving motion therefrom are fixed or arranged pawls or detents which engage
with teeth or slots and with a pin formed upon or secured to the locking wheel. This
arrangement enables the clockwork at each station on the same line to be simultaneously
released or locked as required. Upon the spindle of the locking wheel or otherwise in
a similar relation to the locking wheel there is fixed a cam or equivalent device for
making and breaking contact, upon which rests a spring. This spring is so constructed
and arranged that when the locking wheel and therefore the cam or equivalent device is
in a proper position, contact is made or broken in a local circuit including a bell or instru-
ment. The movement of the spring is further controlled or supplemented by a projection
or cross arm carried or actuated by the lever so that unless the lever or the cross arm

page_text: thereon is caused to fall into its proper position and thus to stop the locking wheel the
spring remains in its normal position or fails to make contact and thus the local
instrument or apparatus is not put in circuit.
An index or pointer may be fixed upon or attached to the arbor of the locking
wheel so as to indicate upon a dial whether or not the line is in use from any other
station.
The hereinbefore mentioned cams in or operated by the clockwork at each station
are respectively and relatively constructed arranged or disposed to come successively
into the position required to enable the springs resting thereon to make or break con-
tact in the local circuits.
a
The ringing up and similar local arrangements are so disposed and constructed that
a subscriber or other person at any of the stations may, when the instruments are in
their normal position, ring up or signal the exchange or central station by pressing
key but when the line has been put in use by the movement of the locking wheel of
each instrument from the zero position, no subscriber or person other than the one who
is in possession of the line can signal, listen or in any way ascertain or interfere with
any message or communication to or from any other station or stations because their
instruments are for the time short circuited or cut out of the line or circuit.
The construction and arrangement of the apparatus permits each station to be placed
in communication with the exchange or centre and further allows any station to be
placed in communication with any other station on the same line or circuit.
A self winding arrangement may be adopted or the clockwork may be actuated or
driven by springs or weights. A convenient form of self winding arrangement may be
constructed by attaching to the arbor of a suitable wheel of the clockwork a cross arm
or lever one end of which is weighted while the opposite end on the other side of the
arbor is capable of being attracted or moved by an electro magnet. This arrangement
enables the weighted end of the lever to be lifted on the passage of a current through
the coils of the electro magnet. A ratchet wheel may be attached to the arbor
carrying the weighted lever in proximity to one of the wheels of the clockwork which
is free to revolve on the same arbor but is intermittently rotated in one direction
therewith by means of a pawl or detent which may be pivoted or pinned upon the wheel
and engage with the ratchet in such a manner that when the weighted lever is released
and the weighted end consequently falls the clockwork is actuated. By this arrange-
ment each instrument or apparatus is wound up or the weight for driving it is raised
every time it is used and the necessity for external aid in winding is avoided.
Alternatively, the winding may be effected by means of a small electro-motor in a
local battery circuit which may be closed periodically from the exchange or central
station or be made to close its own circuit automatically.
Two sheets of Drawings are appended hereto and illustrate in what manner these
Improvements may be carried into practical effect. Similar parts or elements when
they occur are indicated by similar letters in the various Figures.
Fig. 1 represents a front view and Fig. 2 a side view of a convenient construction of
the clockwork device which is employed at the contral station and at each station
on the line. Fig. 3 represents a back view with the winding arrangement and some
other details omitted for greater clearness.
A is the locking wheel which has as many slots or teeth on its periphery as there
are instruments on the line. In the instrument illustrated there are four slots, it being
understood that there are three instruments on the line and one at the central station. The
scape wheel Bis mounted on the locking wheel axis and is controlled by the balance C
by a lever in the usual manner. The cams or contact making devices are mounted on
the same axis as the locking wheel and are indicated by the numerals 1, 2 and 3.
These are shown in section in Fig. 4 where the insulation is indicated by the solid
black parts. They are also indicated and identified by the same numerals in the
diagram of the circuit arrangements Fig. 5. An apparatus for releasing the clock
work is shown in Figs. 2 and 3. D is a lever pivotted at E and passing between two
pins F fixed upon an auxiliary lever G pivotted at H so that motion imparted to D is
communicated to G. The lever D is connected to a polarised electro magnet I so

page_text: that the passage of a current in one direction through the coils of the electro-magnet
deflects the lever to the right and in the other direction to the left. Motion in one
direction operates the locking device and in the other direction the relasing apparatus.
The springs by means of which contact is made with the cams 1, 2 and 3 are indicated
in Fig. 1at and in Fig. 2 above the cams, also in a dotted line in Fig. 1 and below
cam 2 in Fig. 2. The circuits are represented in Fig. 5 and are hereinafter described.
The lever G carries a cross arm K Fig. 3 which is pivotted to the lever and supported
by a spring. The cross arm is so proportioned and formed that when it is moved to
the left it can enter one of the slots in the locking wheel and arrest its motion. The
other end of the cross arm is constructed to operate the stop motion of the clock work.
This stop motion consists of the arm or spring L carrying a projection M. and a
detent N which is capable of engaging with or into a projection formed upon or moving
with the arbor of the balance wheel. When the locking device is secured by the end
of the cross arm moving with the lever G, the stop motion comes into action and when
the locking device is released or when the lever G moves to the right the stop motion
is released.
A self winding arrangement is illustrated in Figs. 1 and 2 where 00 are the coils
and P is the armature of a simple form of electro-motor. A pinion is fixed upon
the armature spindle and gears into a wheel R which communicates motion through
another pinion to the wheel on the barrel spindle and thus winds the clock. The motor
is automatically operated by the periodical closing of a local circuit by means of the
clock work as is well understood and employed for similar purposes such as in self
winding clocks, or the circuit may be periodically closed from the central station.
The diagram Fig. 5 shows in what manner the various circuits are connected and
operated. The cams 1, 2 and 3 are most conveniently mounted on the same axis as
represented in Figs. 2 and 3 but they may be otherwise arranged to rotate synchron-
ously. The cam 3 has two insulated points a and b of which a occupies the same
position in all the instruments on the same circuit. By this arrangement all the
instruments are in circuit when the clockwork is stopped at the zero position and are
short circuited in every other position except. 6 which occupies a different position in
each instrument. The position of the insulation will vary with the number of
instruments in the system and is arranged so that it comes under the contact spring
when the local locking device comes into action. By this means since all the cams in
the system rotate synchronously, only one station can have its local instrument connected
to the line at the same time excepting at the zero position. To avoid ringing up all
the subscribers when the cam 3 is at the zero position the cam 2 is employed. This
resembles cam 3 in all respects except that the zero insulation is omitted, the insulation
occupies the same relative position as 6 in cam 3. Cam 1 controls the ringing circuit
and has two contact points ed. The contact e enables the central station to be
signalled at the zero position and the contact d permits signalling to the central
station when the local instrument is in circuit. The position of the contact d is varied
in the different instruments on the same line to correspond with the insulation b on
cam 3 and the insulation of cam 2. O represents the circuit through the winding
motor coils. I is the electromagnetic system for operating the lever G. S is a contact
arm on the winding barrel of the clock work which periodically closes the motor
circuit. T is the local battery; U the local instrument which may be telegraphic or
telephonic; the line to and from the station is as indicated.
The arrangement and operation of the local circuits is as follows-All the instru-
ments being at zero the circuit is closed in all the stations from the Exchange through
g, h, i, J, j, and I to the next station or, at the last station, to earth. The transmission
of a current actuates I and thereby starts all the clocks. The attendant at the central
station as soon as it is indicated that the required station has its cams in the desired
position by the movement of the clock work, sends a current in the reverse direction
and thereby stops the clocks at all the stations. Then, at the station in communication
the cams are:-
(1), d to spring J¹, (2), insulation to spring J2, and (3), b, to spring J³.
The circuits are:-line through J³, g, h, 1, (or m if the telephone is in circuit), 7, I and
to next station or, in case this is the last station, to earth. At the same time the

page_text: positions of the cams at every other station are: (1) insulation to J', (2), metal to J'
and (3), meta! to J' and the circuit in each case is :-Line to J³, through cam 3,
r,j, and I to next station or, in the case of the last station, to earth. The local
instrument is consequently short circuited.
The ringing up circuits are closed in two positions at zero and when the local
instrument is in circuit. When at zero the circuit is from battery pole y through 0,
spring c, contact e, spring J', n, insulated contact t, key u, (when depressed), h, and g,
to exchange; from battery pole z, through p, O. I, to next station or, at the last station,
to earth. The circuit is closed in the same manner when the local instrument is in
circuit only the contact d on Cam I, is substituted for e. The local motor circuit O
is closed with the local battery through p and q by the periodical closing of the
contact S.
We desire it to be understood that we do not limit ourselves to the precise construc-
tion and arrangement or combination of the elements or parts of the apparatus
constituting our Improvements, for example instead of short circuiting the local
instrument we may similarly arrange to disconnect it from the line altogether at the
required periods, which will effect the same purpose. The number of cams and the
nature of the circuits and their connections will vary with the type of the instrument
employed and with other conditions, but they can in all cases be deduced from the
typical example illustrated by Fig. 5.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is :-
(1) A telegraphic or telephonic Individual Call System constructed arranged and
operated substantially as and for the purposes herein before described and as illustrated
by the accompanying Drawings.
(2) In an individual call system for telegraphic and telephonic purposes; the
combination of a locking and roleasing device with clock work, synchronous contact
cams, and an electro magnetic system for operating the locking and releasing
devices; all constructed arranged and operated substantially as hereinbefore described
with reference to the appended drawings.
(3) In an individual call system for telegraphic and telephonic purposes; the com-
bination with the locking device of a contact cam and a contact spring operating to
put the local branch line or local circuit into or out of connection with the system and
constructed and arranged substantially as hereinbefore described.
Dated this 28th day of December A.D. 1887.
WILLIAM E. HEYS,
Agent for the Applicants.