Year: 1890

page_text: When the lamp burns the carbons are consumed and the are between the two is
enlarged and the resistance increased, thereby actuating the armature lever and
releasing the clutch which holds the carbon rod letting it descend by gravity until the
arc is diminished to its proper width, and rotating the disc carbon just far enough to
present a fresh portion of its edge to the end of the pencil, and near enough to make
the proper arc.
as a are two rods affixed to the under side of the base upon which the electro
magnets are placed, and from which they extend downwards, and are joined together
by suitable means at the bottom, from a hanger support for the lower or pencil
carbon a. These rods are hollow, and through one of them an insulated electric
conducting wire passes to the connection between it and the lower end of the pencil
carbon.
e is a circular block which is affixed to the bottom of the loop that supports the
pencil carbon and forms a support for the glass globe which surrounds the carbon.
This block is affixed to the loop at the bottom of the hangers by means of a screw.
el is an electric connection between the conducting wire in the hanger rod and the
pencil carbon a'. It is affixed to a block which is an insulation.
e2 is a support for the bar a' connected with the hanger rod a".
ee are the springs on the outside of the bar a' which allows the bar a yielding
movement when the disc carbon and its appurtenances are raised up in the lamp.
e shows insulation around and under the lower end of the pencil carbon a¹.
e are arms secured to the rods as as, and carry a circular collar which embraces
the circumference of the top edge of the glass globe and keeps it in place.
e is a supporting platform on which the electro magnets are placed, and through
which the rod which supports the disc carbon passes. There is also on this platform
a stand which supports the armature lover.
e are suspension wires by which the platform and all the parts composing the lamp
are suspended from any suitable fixture above.
e are two lifting magnets secured to the platform e..
e are two shunt electro magnets on the platform e and are connected by wire 8
to the positive wire and by wire 9 to the negative wire.
c is the armature lever which is supported and pivoted on the inside of the stand
so that both ends of it are free to move vertically as the electric current may
affect it.
c is an adjusting device by which the motion of the armature is regulated.
cis what is known as a cut-out, the function of which is to make an electric con-
nection between the cores of the electro magnets eª e³.
3 is a resistance coil of German silver wire, one end 5 of which is connected to
the positive conducting wire, thence extending downward below the platform e, where
it is wound several turns around blocks affixed to the under side of the platform for
that purpose, thence by its end 6 to a conductor on the top of, but insulated from, one
of the shunt magnets. A wire 7 connects a similar conductor on the other shunt
nagnet to the negative conducting wire so that when the armature lever c is drawn
down so as to make connection between the two conductors on the shunt magnets the
current passes directly to the negative wire.
e is a spiral spring which brings the armature levere and the cut-out e² down and
keeps the cut-out in contact with the cores of the shunt electro magnets e, until the
superior force of the electric current overcomes the spring and brings the opposite end
of the armature lever down to the top of the cores of the magnets &, and raises the
cut-out away from the cores of the shunt electro magnets e, whereby the electric
current is conducted down the carbon rod a³ to the disc carbon a and to the pencil
carbon a' making the light in the arc.
'
c is a rod which is affixed at its upper end to the armature lever, and at its lower
end by a joint to a tilting clutch through which the carbon rod passes by an opening
larger than the carbon rod.
is the tilting clutch. When the end of it connected with the rod c³ is raised, it
engages two sides of the carbon rod and holds it and the disc carbon in position ;

page_text: this takes place when the end of the armature lever c is brought down by the electric
current so as to make contact with the tops of the cores of the electro magnets es e³.
is the positive wire, and the binding post through which the electric current
enters, and it then continues by a wire 1 to a conducting brush e affixed to the
upper side of the platform, and reaching upwards in a slanting direction to, and in
contact with the carbon rod a'. The electric current thence follows down the carbon
rod a to the disc carbon a, ihence to the point of the pencil carbon a¹ and
through it, and over a contact piece e¹ to a conducting wire 2, in the right hand
rod of the supporting hanger through which it extends upwards to the insulated
wire around the electro magnets ea thence by a wire 3 to the binding post 4 and
negative wire c³. The electric current is divided when it reaches the shunt electro
magnets, and a small part of it is shunted from the main circuit, thereby reducing the
current through the carbon.
represents the glass globe which surrounds the carbons and protects the light.
In the use of this lamp the rotation of the disc carbon is intermittent, and it is
moved forward when the arc has by combustion of the carbon become too large, just
far enough to make the open space between the edge of the circumference of the disc
and the point of the pencil carbon what is required to make what is termed an arc.
When the combustion of the carbons makes the space too great for a proper
working arc, the resistance of the passage of the electric current becomes such that
the armature lever vibrates enough to release the hold of the clutch upon the carbon
rod and it descends by gravity carrying the disc carbon, its journal and the ratchet
wheel as, and partially rotating the ratchet wheel a³ by its engaging the teeth on the
bar a the journal and the disc carbon with it bringing the circumference of the disc
near enough to the point of the pencil carbon to make an arc and produce a light.
When this occurs, the armature lever vibrates in the direction opposite to its last
movement, causing the clutch to engage the carbon rod again and prevent it from
descending further and holding it and the disc carbon securely at the point where it
and the pencil carbon form a light producing arc.
The pencil being stationary, the disc descends a little lower down after each com-
plote rotation than it was during the previous rotation, and so on until the disc carbon
is as nearly consumed.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. In an arc lamp, the combination of the bifurcated carbon rod, the disc carbon
journalled in the bifurcated end of the rod, the pencil carbon, the gear wheel on the
shaft of the disc carbon and the stationary rack engaged by said gear wheel,
substantially as set forth.
2. In an arc lamp, the combination of the carbon rod, the disc carbon-mounted
therein, the plates for securing the journals of the disc carbon, in place, and mechanism
for rotating the disc carbon as it descends, substantially as set forth.
3. In an are lamp, the combination of the electro-magnets, the armature lever,
the carbon rod, the clutch for holding said rod, the disc carbon mounted in said rod,
mechanism for rotating the disc carbon as it descends, and a pencil carbon,
substantially as set forth.
4. In an arc lamp, the combination of the carbon rod having the bifurcated end,
the disc carbon mounted in said end, the plates for holding the journals of the disc
carbon in place, mechanism for imparting a rotary movement to the disc carbon as
it descends, and a pencil carbon, substantially as set forth.
5. In an arc lamp, the combination with the carbon rod and disc carbon mounted
therein of the sliding plates for holding the journals of said carbon in place,
substantially as set forth.
6. In combination with an arc lamp having a disc and pencil carbon, a holder
for the pencil carbon consisting of an adjustable socket a held in the bottom of the

page_text: lamp by means of a clamp whereby the position of the pencil carbon can be adjusted
in position and held in proper relation to the disc carbon.
7. A disc carbon holder consisting of a spindle having a screw thread and a conical
enlargement and a split thimble constructed substantially as set forth.
8. In combination with an arc lamp having a disc carbon a carbon holder con-
sisting of a spindle having a screw-threaded enlargement 1, a conical projection 2,
and a split thimble 4, having a flange 5 adapted to fit the screw-threaded enlargement,
whereby the thimble can be expanded to fit the hole in the carbon disc, substantially
as set forth.
9. In an arc lamp the combination of the rack a with the toothed wheel as secured
to the shaft a² upon which the disc carbon is mounted for imparting a rotary motion
thereto, substantially as set forth.
Dated bits or day of U
EDWIN CHARLES RUSSELL.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.