Improvements in Electric Telegraphic Apparatus.
Year: 1892

page_text: Date of Application, 31st Oct.. 1892
Complete Specification Left, 31st Aug., 1893-Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Electric Telegraphic Apparatus.
I, LEICESTER BRADNEY STEVENS of Darlington Works, Southwark Bridge
Road in the County of Surrey, Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention has for its object to provide an electric telegraphic apparatus of
simple construction by means of which signals may be transmitted from one place
or station to another and each signal exhibited or graphically indicated at the
receiving end of the line, and which shall not be liable to get out of working order,
and which may be readily manipulated by any person unskilled in the art of
telegraphing and consists essentially of a sending or transmitting instrument
having a number of contact keys corresponding with an equal number of division
spaces on the dial of a receiving instrument, the two instruments being electrically
connected in such a manner, that on the depression of any contact key of the
sending or transmitting instrument an index pointer on the receiving instrument
is rotated until it reaches a corresponding division space on the said indicating
dial.
In one arrangement of apparatus constructed according to this invention the
receiving instrument comprises a number of pivotted stop levers arranged radially
around a spindle or arbor rotated by an electromotor and carrying an index pointer
traversing a dial having division spaces on which are printed or otherwise
graphically displayed the required instructions or other signals. On the outer end
of each radial pivotted stop lever is mounted a magnet coil or bobbin forming part
of an electric circuit, so that on the passage of an electric current the lever, which
forms the core of an electromagnet, is magnetised and its polar extension is attracted
to a fixed armature which causes its inner end to project into the path of a pro-
jecting arm on the index spindle or arbor and to arrest its motion. On the cessation
of the current the radial stop lever is returned to its normal position by a spring,
leaving the index pointer free to be again operated. A signal bell placed in the
receiver circuit is operated on the passage of a current through the receiving
instrument and serves to call attention to it.
The sending or transmitting instrument comprises a series of lever contact keys
corresponding in number to the stop levers and division spaces on the indicating
dial of the receiving instrument and secured to a common conductor connected to a
battery or other electric generator, the outer or free end of each contact key being
resilient and split so that on the depression of a key one part of the split end makes
contact with a contact plate electrically connected to the stop lever coil, while the
other part makes contact with a similar contact plate connected to the coils of the
electro motor which actuates the receiver index pointer. By causing the contact
key to make the stop lever coil contact slightly before the motor contact, the stop
lever is operated slightly before the index pointer is rotated.
It will be readily understood that each stop lever coil is separately connected to
its corresponding contact plate in the transmitting instrument, while all the motor
contact plates are connected through one common conductor to the motor coils.
The receipt of a signal is acknowledged at the receiving end of the line by the
depression of a key which closes a circuit to ring a signal gong at the transmitting
end. In this circuit is also placed the coils of an electromagnetic brake consisting
of two pivotted levers placed symmetrically on either side of the index arbor, and

page_text: electromagnets which, when energized by an electric current, attract the said levers
and cause them to grip the index arbor.
Dated this 31st day of October 1892.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Electric Telegraphic Apparatus.
I, LEICESTER BRADNEY STEVENS, of Darlington Works, Southwark Bridge
Road, in the County of Surrey, Engineer, 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 provide an electrical indicating apparatus of
simple construction by means of which signals may be transmitted from one place
or station to another and each signal exhibited or graphically indicated at the
receiving end of the line, and which shall not be liable to get out of working order,
and which may be readily manipulated by any person unskilled in the art of
telegraphing and consists essentially of a sending or transmitting instrument having
a number of contact keys corresponding with an equal number of division spaces or
signals on the dial or dials of a receiving instrument the two instruments being
electrically connected in such a manner that on the operation of any contact key of
the sending or transmitting instrument an index pointer or other indicating device
on the receiving instrument is operated to indicate or exhibit a corresponding
division space or signal on the said indicating dial.
In the accompanying seven sheets of illustrative drawings:
Figure 1 represents a plan of a sending or transmitting instrument, the right hand
portion showing the top cover removed so as to expose the contact keys and
connections to view.
Figures 2 and 3 are transverse sections of the same on the lines A-B and C-D
respectively.
Figure 4 is a front elevation of a receiving and indicating instrument, the left
hand portion showing a dial on which the signals are marked while the right hand
portion represents the dial removed and showing the pointer controlling device and
driving motor.
Figure 5 is a back elevation of the same the back cover of the casing being
removed.
Figure 6 is a vertical section of the same and
Figures 7 and 8 are two diagrams showing arrangements of the electrical
connections of the apparatus.
Figures 9 to 15 inclusive represent a modified arrangement of apparatus con-
structed according to this invention in which Figure 9 is a plan of a sending or
transmitting instrument the left hand portion showing the upper part removed to
exhibit the contacts and Figure 10 is a vertical section on the line E-F.
Figure 11 represents a vertical section of a receiving and indicating instrument.
Figure 12 is a transverse section through the same through G-H (Figure 11).
Figure 13 is a back elevation of electric motor for driving the indicating drum and
Figures 14 and 15 are front elevation and transverse section of receiver or
indicator case arranged to contain three signal indicating drums.
In one arrangement of apparatus constructed, according to this invention and
illustrated in Figures 1 to 8 inclusive the receiving instrument (Figures 4, 5 and 6)
comprises a number of stop levers a pivoted at b and arranged radially around a
central spindle or arbor c working in suitable bearings in the plates d and e and
carrying at one extremity an index pointer f which traverses a divided dial 9 on
which are marked the various directions or signals to be indicated, the said arbor

page_text: ad pointer being rotated when desired by means of an electromotor
rough the endless driving chain i and pulley k as will be readily understood. An
m also mounted on the arbor c is normally free to rotate under the action of the
riving motor h, but on the passage of an electric current through one of the
obbins m the stop lever a whose one end forms its core, is magnetized and attracted
an armature n fixed to the baseplate o which causes the other end p to be pro-
ected into the path of rotation of the said arm / so as to arrest its motion, and
On the cessation of
onsequently that of the pointer f in the required position.
he current and consequent demagnetization of the lever a the said lever is
eturned to its normal position by the spring 9. The pointer or other convenient
part mounted on the arbor e is weighted so as to insure its stopping, when free, in a
An electric gong r
lefinite position favourable to the restarting of the motor h.
with resistance coils is operated on the passage of a current to call the attention of
the attendant to the apparatus; it may be operated either automatically by a shunt
from the motor circuit or by a separate contact. On the side of the casing is a
contact key t which serves to complete or break an electric circuit through a gong
in the transmitting instrument.
I
2
The sending or transmitting instrument shown in Figures 1, 2 and 3 comprises a
series of lever spring contact keys corresponding to the stop levers a in the
receiving instrument and secured to a common insulated conductor bar w connected
to a battery or other electric generator, the outer free end of each contact key
being divided to form two legs or fingers y so that on the depression of any key
one leg of the divided end makes contact with an insulated contact plate
electrically connected with a corresponding stop lever coil m in the receiving
instrument while the other leg y makes contact with a finger a a of the insulated
contact plate ab connected to the coils of the electric motor h which actuates the
index pointer f. The leg is caused to make contact with its plate slightly in
advance of the leg y which ensures the closing of the circuit of the stop lever
magnet coils slightly in advance of the motor circuit, and thereby prevents the
motion of the pointer being effected before the proper stop lever is raised. A
signal gong ac connected to the contact key t on the receiver, through the
terminals ad, ae, enables the attendant at the receiving end to indicate the
reception of a signal to the operator at the sending end. On the sending
instrument is arranged a series of printed signals (Figure 1) corresponding to
similar signals on the receiving dial (Figure 4) each such signal standing opposite
to a corresponding key button af so that on the depression of an appropriate button
the stop lever and motor circuits are closed and the corresponding signal indicated
on the receiving instrument.
The electrical connections will be readily understood on reference to Figure 7.
0 The electric generator B is connected to the key t on the receiving instrument and
From the key t a conductor ah passes to the
to the common return wire a g.
insulated key bar w and through the keys v to contact plates z, ab and thence
through coils m and motor h to the common return wire ag to battery B. The
depression of the key t closes a circuit through the gong ai and return wire ag to
5 battery B and the closing of the contact ak on the transmitting instrument
completes a circuit through the gong al on the receiving instrument and common
return wire to battery B.
In the arrangement of electrical connections shown in diagram Figure 8 the
gong al at the receiver is actuated automatically on the depression of a key v by
50 means of a shunt from the motor circuit as will be readily understood from the
diagram.
In the apparatus herein before described and illustrated the indicating dial of the
receiving instrument and the keyboard of the transmitting instrument are shown as
marked with the particular instructions to be issued, but it will be obvious that any
65 other convenient system of signals may be adopted, for example, the indicating
Moreover several
dial may be divided into, say, ten parts and numbered, each number representing
a distinct instruction according to any prearranged code.

page_text: key-boards and receiving instruments may be combined to produce a great number
of combinations. By using three sets of contact keys containing ten in each set and
three corresponding receivers arranged with their axes continuous or identical one
set may be used to denote units, one tens, and the other hundreds, then by arranging
three circles on the receiver indicating dial and passing the back axes through
front telescopically and mounting three separate pointers on the three axes, any
number up to 999 may be transmitted and indicated on the receiver dial.
The modified arrangement of apparatus shown in Figures 9 to 15 inclusive, is
constructed on the principles above indicated but instead of a dial and pointer
being used in the receiving instrument a drum is mounted on the index arbor and
the signals are marked on its periphery, numbers, corresponding to a prearranged
code, being preferably employed and by arranging two or more such drums side by
side so as to read units, tens, hundreds, &c. the number of combinations may be
increased almost indefinitely.
The receiving instrument comprises ten pivoted stop levers a m arranged radially
around an arbor an carrying a drum ao on the periphery of which corresponding
numbers from 0 to 9 are marked. On the arbor an is also mounted the armature of
the driving electromotor ap. The levers am are pivoted at aq and form at one
end an armature for the electromagnet ar secured to the frame plate as while the
other end terminates in a stop pin at which when the armature end is attracted to
the electromagnet a r, on the passage of a current through its coils, is projected into
the path of the arm a v mounted on the arbor an and arrests the rotation of the
drum ao in such a position that a figure corresponding to the said lever operated is
displayed to view. Notches a w in the disc ar forming part of the frame as guide
and support the pins at when the levers am are operated, the said levers being
normally held free of the arm av by springs a a¹. The drum a o is weighted so that a
cipher (0) is normally exhibited to view this position being also favourable for the
starting of the motor on the passage of a current. The receiver drums are secured
in a case (Figures 14 and 15) having holes ay through which only one numeral on
cach drum can be seen at once.
b
The sender or transmitter comprises three sets of keys a z, a, bb, passing
through a metal plate bc and a vulcanite plate bd mounted on a base be, also of
nonconducting material. On the rotation of a key through 90° the projection on the
cam bf makes contact with the spring bg which is in electrical connection with
the electromotor ap and magnet ar of the receiving instrument. Sliding on the
plate bd is a locking frame formed of a vulcanite frame bh surmounted by a metal
plate bi and operated by means of a switch lever bk and handle 67 and being guided
and its motion limited by pins 6 m and slots bn as is clearly shown. A stud pin bo
makes contact with a contact spring bp connected to the battery when the locking
frame is in its normal or locking position. The three rows of keys az ba bb are
respectively connected to the three receiver drum stop lever electromagnets ar and
represent units, tens, and hundreds.
When it is desired to transmit an instruction represented by the number say 567
the locking frame is withdrawn by the switch handle b7 and lever bk the keys
representing 5, 6 and 7 on the units, tens, and hundreds rows respectively are
turned through a right angle so that the projections on cams bf make contact with
the corresponding contact springs by the locking frame is then returned to its
normal position, the projections bg on which prevent the turning of the
keys az, ba, bb until the frame is again withdrawn. The closing of the locking
frame causes the stud bo to make contact with a spring bp connected to the battery
and so complete the electric circuit to operate the indicating drums to exhibit the
required numerals. The electric circuit passes from one pole of the battery
through the electromotor a pelectromagnet a'r contact cams bf, plate be switch lever
spindle br lever bk plate bi stud bo contact bp to battery B.
Electric call gongs are placed at each instrument connected to the battery and
controlled by suitable contact pushes, to, attract the attention of the operator.or
attendant.

page_text: Having now particularly described and ascertained the nature of my sala
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an electric telegraphic apparatus: a receiving instrument comprising a
number of pivoted stop levers, forming the cores of electromagnets, arranged
around an arbor carrying an index pointer traversing a signal dial in such manner
that on the passage of an electric current through a magnet coil the encased lever
is attracted to an armature and projected into. the path of rotation of an arm
secured to the said arbor substantially as described and for the purpose set forth.
2. In the receiving instruments of electric telegraphic apparatus: a rotating
arbor carrying an index pointer, an indicating dial traversed by the said pointer, a
projecting arm mounted on the said arbor and an electric motor for driving the said
arbor in combination with pivoted stop levers controlled by electromagnets the
whole substantially as described.
3. In electric telegraphic apparatus the arrangement and construction of receiving
and indicating apparatus substantially as described with reference to Figures 4, 5
and 6 of the drawings.
4. In electric telegraphic apparatus, a sending or transmitting instrument
comprising a series of lever spring contact keys corresponding to stop levers in a
receiving instrument and secured to a common insulated conductor bar connected
to an electric generator, the outer or free end of each contact key being divided to
form two legs or fingers so that on the depression of any key one leg makes contact
with an insulated contact plate electrically connected with a corresponding stop
lever coil in a receiving instrument while the other leg makes contact with an
insulated plate connected to the coils of an electric motor which actuates the index
pointer substantially as described.
5. In the transmitting instruments of electric telegraphic apparatus: a series of
divided lever contact keys corresponding with printed signals on a key board and
with signals on the dial of the receiving instrument and secured to a common
insulated conductor bar, contact plates electrically connected to the stop lever
magnet coils and electromotor of the receiving instrument respectively, in
combination with an electric alarm gong and contact keys at the transmitter and
receiver substantially as described.
6. In electric telegraphic apparatus: the arrangement and construction of
5 transmitting instruments substantially as described with reference to Figures 1, 2
and 3 of the drawings.
7. In an electric telegraphic apparatus: a receiving instrument comprising
pivoted levers arranged around an arbor carrying a drum on which corresponding
numerals are marked so that on the passage of an electric current through the coil
0 of an electromagnet the said lever is attracted and projected into the path of
rotation of an arm secured to the said arbor substantially as described.
8. In the receiving instruments of electric telegraphic apparatus; a rotating
arbor carrying an indicating drum, a casing with apertures for reading the indications
on the said drum, a projecting arm mounted on the said arbor, an electric motor for
5 driving the said arbor in combination with pivoted stop levers controlled by
electromagnets the whole substantially as described.
50
55
9. In electric telegraphic apparatus the arrangement and construction of receiving
and indicating apparatus substantially as described with reference to Figures 11
to 15 inclusive of the drawings.
10. In electric telegraphic apparatus: a sending or transmitting instrument
comprising a series of contact keys corresponding to stop levers in a receiving
instrument and having cams which, when rotated, make contact with contact
springs, the said keys being locked in an open or closed position by means of a
sliding locking frame substantially as described.
11. In the transmitting instruments of electric telegraphic apparatus: a series
of contact keys adapted to make contact with spring contacts electrically connected

page_text: to the stop lever electromagnet and electromotor of a receiving instrument in
combination with a sliding locking frame for locking the said keys in either an
operative or inoperative position substantially as described.
12. In electric telegraphic apparatus: the arrangement and construction of
transmitting instruments substantially as described with reference to Figures 9
and 10 of the drawings.
13. In electric telegraphic apparatus the arrangement, construction, and
combination of transmitting and receiving instruments electrically connected
together and operating substantially as described with reference to Figures 1 to 8
of the drawings hereunto annexed.
14. In electric telegraphic apparatus the arrangement, construction, and
combination of transmitting and receiving instruments electrically connected
together and operating substantially as described with reference to Figures 9 to 15
inclusive of the drawings hereunto annexed.
Dated this 31st day of August 1893.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.