Improvements in Electric Telegraphs.
Year: 1890

page_text: Date of Application, 28th Apr., 1890
Complete Specification Left, 1st Jan., 1891-Accepted, 28th Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Electric Telegraphs.
1, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this invention (a communication to me
from abroad by Sigmund Schuckert and Co., of Nuremberg, Germany, Manu-
facturers, through their Agents, Wirth and Co., of Frankfort-on-the-Main,
Germany,) to be as follows:-
This invention will be described with reference to the accompanying drawings,
Figures 1, 2, and 3 of which represent, diagrammatically, three different
modifications.
The other
Referring to Figure 1, the transmitter A has a contact key K and within
its range a number of contacts el c² c³ etc., respectively corresponding to the
different signals to be given. These contacts are respectively connected by con-
ductors LL² L³.. to as many rubbing contacts s¹³ of the receiver B which
bear on a switch disc U made of two half rings insulated from each other and
respectively placed in communication by means of the rubbing contacts S₁ S" with
the respective ends of the field magnet coils of an electro-motor E.
connections will be clear, from the diagram. Now, as one or the other half of the
switch disc is connected by means of the key K with the source of current P" P³,
the current will flow through the one or the other field magnet coil of the motor.
A suitable switching device is provided, so that the direction of rotation of the
motor will depend upon which of the said coils is traversed by the current. The
armature shaft is geared by worm or spur gear with the switch disc U which will
therefore rotate with the said shaft until the exciting current is interrupted. This
takes place when the rubbing contact corresponding to the contact upon which the
key K is placed bears upon the insulating segment of the disc. If, however, the
armature after being revolved should continue in motion by virtue of its own
momentum after the exciting current has been thus interrupted, the rubbing contact
in question will make contact with the other half of the disc U and the motor will
be excited in the opposite sense and its armature will be rotated in the opposite
direction and so bring the insulating segment back under the said rubbing contact.
The insulating segment will therefore always be brought under that rubbing contact
which corresponds to the position of the key K, and therefore if the several
contacts correspond to predetermined signals, the position of the switch disc will
indicate at which signal the key K of the transmitter has been set.
Instead of the reversal of motion being effected as above described and employing
two field coils acting in opposite senses, the same object can also be attained by
reversing the direction of the current in the armature.
Referring to Figure 2 W is a resistance connected in parallel to the magnet coils
with the source of current. The brush of the motor commutator is connected to
the middle m of the resistance whilst the other brush 62 can by means of the key K
The armature is
and the disc U be brought into connection either with p or n.
then situated in a shunt to the one or other half pm or mn of the resistance and the
current passes through the armature in the one case from 2 to and in the other
case from to 2 and the direction of rotation of the motor changes accordingly.
The mode of operation does not differ in other respects from that first described and
will be readily understood.
The arrangement shewn in Figure 3 is designed to diminish the number of con-
ducting wires by connecting the contacts c¹² c³ etc., at the transmitter into, say,
four groups (more or less) those contacts whose reference letters are distinguished

page_text: on the drawing by the same exponent being connected to the same conductor L'LL³
and LA, as the case may be. These conductors are respectively connected to the
four contact springs 1, 2, 3, and 4, which rub on the disc or cylinder-shaped switch
or commutator S having three divided rubbing rings of which the halves. distin-
guished by cross-hatching are all connected with the continuous rubbing ring the
other halves being connected with the rubbing, ring, as indicated. Two rubbing
contacts bear on the rings and respectively and are connected with the
oppositely wound coils of the field magnets W¹ and W2 of the electro motor E
which being magnetised in opposite directions cause the motor and consequently
the disc S to be rotated to the left or to the right according as the key K is rotated
to the left or to the right, since, the other connections being as shewn, the right
hand contact will convey current to the coil W through the rubbing ring and
spring whilst the contact c² will include the coil Win the circuit.
In each form of the apparatus, the axes of the switch disc and of the key will
each carry a pointer working over a dial.
Dated this 28th day of April 1890.
COMPLETE SPECIFICATION.
Improvements in Electric Telegraphs.
1, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this invention (a communication to me
from abroad by Sigmund Schuckert and Co., of Nuremberg, Germany, Manu-
facturers, through their Agents, Wirth and Co., of Frankfort-on-the-Main,
Germany), and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention will be described with reference to the drawings left with the
Provisional Specification,
Figures 1, 2, and 3, of which represent, diagrammatically, three different
modifications.
Referring to Figure 1, the transmitter A has a contact key K and within
its range a number of contacts c¹, e², c³, etc., respectively corresponding to the
different signals to be given. These contacts are respectively connected by
conductors L', L³, Lª... to as many rubbing contacts 1, 2, 3, of the receiver B,
which bear on a switch disc U made of two half rings insulated from cach other
and respectively placed in communication by means of the rubbing contacts St S
with the respective ends of the field magnet coils of an electro-motor E. The other
connections will be clear, from the diagram. Now, as one or the other half of the
switch disc is connected by means of the key K with the source of current P" P",
the current will flow through the one or the other field magnet coil of the motor.
A suitable switching device is provided, so that the direction of rotation of the
motor will depend upon which of the said coils is traversed by the current.
armature shaft is geared by worm or spur gear with the switch disc U which will
therefore rotate with the said shaft until the exciting current is interrupted. This
takes place when the rubbing contact corresponding to the contact upon which the
key is placed bears upon the insulating segment i of the disc. If, however, the
armature after being revolved should continue in motion by virtue of its own
momentum after the exciting current has been thus interrupted, the rubbing contact
in question will make contact with the other half of the disc U and the motor will
be, excited in the opposite sense and its armature will be rotated in the opposite.
direction and so bring the insulating segment back under the said rubbing contact.
The insulating segment will therefore always be brought under that rubbing contact
The

page_text: which corresponds to the position of the key K, and therefore if the several
contacts correspond to predetermined signals, the position of the switch disc will
indicate at which signal the key K of the transmitter has been set.
Instead of the reversal of motion being effected as above described and employing
two field coils acting in opposite senses, the same object can also be attained by
reversing the direction of the current in the armature.
Referring to Figure 2 W is a resistance connected in parallel to the magnet coils
with the source of current. The brush of the motor commutator is connected to
the middle m of the resistance whilst the other brush b² can by means of the key K
and the disc U be brought into connection either with p or n. The armature is
then situated in a shunt to the one or other half pm or m n of the resistance and
the current passes through the armature in the one case from 2 to and in the
other case from 1 to 2 and the direction of rotation of the motor changes
accordingly. The mode of operation does not differ in other respects from that
first described and will be readily understood.
The arrangement shewn in Figure 3 is designed to diminish the number of
conducting wires by connecting the contacts c¹ c² e etc., at the transmitter into, say,
four groups (more or less) those contacts whose reference letters are distinguished
on the drawing by the same exponent being connected to the same conductor L'L' L³
and L, as the case may be. These conductors are respectively connected to the
four contact springs 1, 2, 3, and 4, which rub on the disc or cylinder-shaped switch
or commutator S having three divided rubbing rings of which the halves distin-
guished by cross-hatching are all connected with the continuous rubbing ring the
other halves being connected with the rubbing ring 12, as indicated. Two rubbing
contacts ff bear on the rings and respectively and are connected with the
oppositely wound coils of the field magnets W₁ and W of the electro-motor E which
being magnetised in opposite directions cause the motor and consequently the disc S
to be rotated to the left or to the right according as the key K is rotated to the
left or to the right, since, the other connections being as shewn, the right hand
contact c¹ will convey current to the coil W through the rubbing ring r¹ and
spring whilst the contact c² will include the coil W in the circuit."
In each form of the apparatus, the axes of the switch disc and of the key will
each carry a pointer working over a dial.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. A. visual telegraph characterized by the employment at the transmitter of a
witch disc U divided into two parts, in combination with rubbing contacts s¹, s², etc.,
nd S, S, whereof the former are respectively connected by conductors L'L'
ith contacts c¹ c², etc., at the transmitter and the latter are connected with the
eld or armature coils of an electro-motor at the receiver which drives the switch
se U in one or the other direction of rotation.
2. The employment of a switch disc or cylinder having two or more divided
rubbing rings, for the purpose of diminishing the number of conductors between the
transmitter and receiver, in combination with the rubbing contacts flf and 1, 2, 3,
and 4, the latter being placed periodically in connection with the contacts c¹ c² c³, etc.,
at the transmitter by means of the conductors L', L³, L³, L'.
Blood
at Lanno
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.