Improvements in Electric Arc Lamps.
Year: 1891

page_text: Date of Application, 6th Jan., 1891
Complete Specification Left, 3rd Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
We,
ALBERT GAY, of Kensington Central Electric Lighting Station, Richmond
Road S.W. in the County of London, Electrical Engineer, and ROBERT HAMMOND
of 117 Bishopsgate Street, Within, in the County of London, Electrical Engineer,
do hereby declare the nature of this invention to he as follows:-
This invention has reference to a construction of electric arc lamp for alternating
currents in which the position of one or both of the carbons is adjusted or con-
trolled by an electric rotary motor of which the field magnet has compound winding,
one of the windings being in the main circuit of the lamp, and the other in a shunt
circuit around the arc, and the armature is encircled by a closed coil that can
be moved in one direction partly around the armature by an electro magnetic
device arranged either in the main or in the shunt circuit, and in the opposite
direction by a spring or its equivalent or two magnetic arrangements may be used
for moving the closed coil, one being in the shunt circuit and arranged to rock
the closed coil in one direction and the other being in the main circuit and
arranged to rock the coil in the other direction. The arrangement is such that the
lamp will light up whether the carbons be in contact or apart at starting. When
the carbons are apart at starting, or the arc exceeds its normal length, the closed
coil will be moved partly around the armature so as to allow the current in the
shunt circuit of the motor to start the armature gradually in one direction and
bring the carbons together for starting, or to reduce the arc to its normal length if
the lamp be in action. If at starting the carbons are together, or if the arc at any
time gets below its normal length, the closed coil will be moved partly around the
armature so as to allow the current in the series circuit of the motor to start the
armature gradually in the reverse direction and move the carbons apart so as to
strike the arc in the case of starting, or to increase the shortened arc to its normal
length if the lamp be in action. The motion of the armature can be transmitted
to either or both carbons by any suitable means; in one arrangement this is
effected by wheelwork, a pulley, and one or more flexible connectors.
A brake or fan may be provided to regulate the motion of the armature shaft ;
its action may be controlled by an electro-magnetic device.
Deted this 6th day of January 1891.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.Č., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
We, ALBERT GAY, of Kensington Central Electric Lighting Station, Richmond
Road S.W. in the County of London, Electrical Engineer, and ROBERT HAMMOND
of 117 Bishopsgate Street, Within, in the County of London, Electrical Engineer, do
hereby declare the nature of this invention and in what manner the same is
to be performed to be particularly described in and by the following statement :-
This invention has reference to a construction of electric arc lamp for alternating
currents in which the position of one or both of the carbons is adjusted or con-
trolled by an electric rotary motor of which the field magnet has compound

page_text: winding one of the windings being in the main circuit of the lamp, and the other
in a shunt circuit around the arc, and the armature is encircled by a closed coil
that can be moved in one direction partly around the armature by an electro
magnetic device arranged either in the main or in the shunt circuit, and in the
opposite direction by a spring or its equivalent or two magnetic arrangements may
be used for moving the closed coil, one being in the shunt circuit and arranged to
rock the closed coil in one direction and the other being in the main circuit and
arranged to rock the coil in the other direction. The arrangement is such that
the lamp will light up whether the carbons be in contact or apart at starting.
When the carbons are apart at starting, or the arc exceeds its normal length, the
closed coil will be moved partly around the armature so as to allow the current in
the shunt circuit of the motor to start the armature in one direction and bring the
carbons together for starting, or to reduce the arc to its normal length if the lamp
be in action. If at starting the carbons are together, or if the arc at any time
gets below its normal length, the closed coil will be moved partly around the
armature so as to allow the current in the series circuit of the motor to start the
armature gradually in the reverse direction and move the carbons apart so as to
strike the arc in the case of starting, or to increase the shortened arc to its normal
length if the lamp be in action. The motion of the armature can be transmitted
to either or both carbons by any suitable means; in one arrangement this is effected
by wheelwork, a pulley, and one or more flexible connectors.
A brake or fan may be provided to regulate the motion of the armature shaft ;
or its action may be controlled by an electro-magnetic device.
Referring to the accompanying drawing, which is a diagrammatic view, in
perspective of an arc lamp according to this invention, 1 is the armature of an
alternate current motor; it consists of a disc of metal surrounded by a closed
coil 2, and is provided with a field magnet 3. This magnet is wound with two
coils 4 and 5. The former is a series coil. Its circuit commences at the terminal 6,
crosses the arc, traverses the coil of the solenoid 8, and then that of the solenoid 9.
It then passes through the coil on the field magnet 3, and returns to the second
terminal 7. The latter coil 5 is a shunt coil arranged in a shunt circuit that starts
from one carbon or electrode 10, traverses the coil of the solenoid 11, the shunt
coil 5 on the field magnet, and ends at the second carbon or electrode 12.
The closed coil 2 around the armature is capable of being rocked or moved about
the axis of the armature for the purpose of causing the rotation of the armature
in one direction or the other according to the direction in which it is moved or for
bringing the armature to rest. It is connected at one end to the core of the series
solenoid 9, and at the other end to the core of the shunt solenoid 11, and is moved
in one direction or the other according to the relative powers for the time being
of the two solenoids. These solenoids are so constructed that when the arc is of
its normal length, their cores hold the closed coil in a position in which the
armature will be at rest. One of the solenoids 9 or 11 can be replaced by a
spring or its equivalent that will act in opposition to the solenoid retained to
control the position of the closed coil for the purpose mentioned as will be readily
understood.
The carbons are shewn as being operated by a cord or chain 15* passing round
the pulley 15 on the armature shaft 16.
13 is a brake formed of flexible blades mounted on the shaft 16, and so disposed
that on rotating they come into contact with the arm or abutment 14 when it is
raised by the passage of a heavy current in the solenoid 8, after the manner set
forth in the Specification of former Letters Patent granted to us No. 4991 of 1890.
When the shaft 16 is rotating in the direction to open the arc the abutment 14
offers a feeble resistance to the blades, turning on its pivot at 17 against the action
of a spring 18 to let them pass. When the shaft is rotating in the opposite
direction the resistance offered by the abutment is a rigid one and prevents a too
rapid motion of the armature shaft.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
==
1. In an electric arc lamp for alternating currents, an alternate current motor
having a field magnet wound both with a series coil and a shunt coil, and an
armature encircled by a movable closed circuit coil capable of being adjusted by an
electro-magnetic device to give rotation in either direction as required for the
production and maintenance of the arc.
2. In an electric arc lamp for alternating currents, an alternate current motor
having a field magnet wound both with a series coil and a shunt coil, and an
armature encircled by a movable closed circuit coil capable of being adjusted by
two solenoids, one in the series circuit and the other in the shunt circuit, the position
of the coil being determined by the differential action of the two solenoids for the
purpose specified.
3. In an electric are lamp for alternating currents, an alternate current motor
having a field magnet wound both with a series coil and a shunt coil, and an
armature encircled by a movable closed circuit coil capable of being adjusted by an
electro-magnetic device to give rotation in either direction as required for the pro-
duction and maintenance of the arc in combination with flexible brake arms and an
abutment regulated by an electro-magnetic device as set forth.
Di
W. Lloyd Wise,
ALBERT GAY.
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.